{"id":5760,"date":"2026-06-30T20:58:00","date_gmt":"2026-06-30T12:58:00","guid":{"rendered":"https:\/\/rfid-pro.com\/?p=5760"},"modified":"2026-06-30T18:24:26","modified_gmt":"2026-06-30T10:24:26","slug":"dual-frequency-rfid-explained-frequency-pairings-and-the-em4425-chip","status":"publish","type":"post","link":"https:\/\/rfid-pro.com\/fr\/dual-frequency-rfid-explained-frequency-pairings-and-the-em4425-chip\/","title":{"rendered":"Dual-Frequency RFID Explained: Frequency Pairings and the EM4425 Chip"},"content":{"rendered":"<p>A conventional RFID tag normally operates in one frequency band.<\/p>\n\n\n\n<p>A low-frequency animal tag may operate around 134.2 kHz. An NFC label operates at 13.56 MHz. A supply-chain UHF RFID label typically operates within the 860\u2013960 MHz range.<\/p>\n\n\n\n<p>A dual-frequency RFID tag combines two RFID interfaces in one product so that the same physical item can be identified in two different ways.<\/p>\n\n\n\n<p>The most commercially useful combination is usually:<\/p>\n\n\n\n<p><strong>13.56 MHz HF\/NFC + 860\u2013960 MHz UHF RFID<\/strong><\/p>\n\n\n\n<p>This combination connects two different stages of a product\u2019s lifecycle.<\/p>\n\n\n\n<p>UHF RFID supports long-range, high-speed inventory and logistics operations. NFC provides short-range interaction through an NFC-enabled smartphone or HF reader.<\/p>\n\n\n\n<p>EM4425, also known as em|echo-V, is a dual-frequency RFID chip developed by EM Microelectronic for this type of application. It combines HF, NFC and RAIN RFID functionality on one silicon die and allows the interfaces to access a shared configurable memory.<\/p>\n\n\n\n<p>However, not every dual-frequency combination is suitable for every project. The correct choice depends on who needs to read the tag, how far away it must be read, how many tags must be identified simultaneously and whether smartphones are part of the workflow.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Is a Dual-Frequency RFID Tag?<\/h2>\n\n\n\n<p>A dual-frequency RFID tag is a tag that can communicate through two radio-frequency bands.<\/p>\n\n\n\n<p>Depending on the design, it may contain:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>One integrated dual-frequency chip<\/li>\n\n\n\n<li>Two separate RFID chips<\/li>\n\n\n\n<li>Two antenna structures<\/li>\n\n\n\n<li>Shared or separate memory<\/li>\n\n\n\n<li>A printed label, hard-tag or embedded housing<\/li>\n\n\n\n<li>Optional tamper-detection components<\/li>\n<\/ul>\n\n\n\n<p>A dual-frequency tag should not be confused with a wideband UHF tag.<\/p>\n\n\n\n<p>A wideband UHF tag may operate across several regional UHF allocations, but all of those frequencies remain within the same general UHF interface.<\/p>\n\n\n\n<p>For example, a label designed to work in both European and North American UHF bands is still a single-frequency UHF RFID tag. It is not automatically a dual-frequency NFC and UHF product.<\/p>\n\n\n\n<p>A genuine HF\/UHF tag normally requires:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>An HF coil antenna for 13.56 MHz<\/li>\n\n\n\n<li>A UHF dipole or related antenna for the 860\u2013960 MHz range<\/li>\n\n\n\n<li>A chip that can communicate through both interfaces, or two separate chips<\/li>\n<\/ul>\n\n\n\n<p>The final inlay design is therefore more complex than a standard single-frequency RFID label.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Combine Two RFID Frequencies?<\/h2>\n\n\n\n<p>Different RFID frequency bands solve different operational problems.<\/p>\n\n\n\n<p>No single band provides the best performance for every application.<\/p>\n\n\n\n<p>A warehouse may need to read hundreds of products in a carton without opening it. A consumer may later need to tap one product with a phone. A maintenance technician may want to deliberately read one specific asset without accidentally collecting data from nearby items.<\/p>\n\n\n\n<p>A dual-frequency tag allows one physical label to support several users:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Manufacturers<\/li>\n\n\n\n<li>Warehouse operators<\/li>\n\n\n\n<li>Logistics companies<\/li>\n\n\n\n<li>Retailers<\/li>\n\n\n\n<li>Service technicians<\/li>\n\n\n\n<li>Brand owners<\/li>\n\n\n\n<li>Consumers<\/li>\n\n\n\n<li>Recycling or return operators<\/li>\n<\/ul>\n\n\n\n<p>The first interface can support automated business operations, while the second interface supports deliberate close-range interaction.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Common RFID Frequency Bands<\/h2>\n\n\n\n<p>Before selecting a dual-frequency combination, it is useful to understand the main RFID bands.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>RFID band<\/th><th>Typical frequency<\/th><th>Typical reading behavior<\/th><th>Common applications<\/th><\/tr><\/thead><tbody><tr><td>LF<\/td><td>125 kHz or approximately 134.2 kHz<\/td><td>Very short range, individual reading<\/td><td>Animal identification, access control, industrial identification<\/td><\/tr><tr><td>HF<\/td><td>13,56 MHz<\/td><td>Short to moderate range, inductive coupling<\/td><td>Library systems, industrial tracking, smart cards<\/td><\/tr><tr><td>NFC<\/td><td>13,56 MHz<\/td><td>Close-range smartphone interaction<\/td><td>Product information, authentication, payments, consumer engagement<\/td><\/tr><tr><td>UHF<\/td><td>Approximately 860\u2013960 MHz<\/td><td>Long range and fast bulk reading<\/td><td>Retail inventory, logistics, warehouses, asset tracking<\/td><\/tr><tr><td>Microwave<\/td><td>Commonly 2.45 GHz<\/td><td>Specialized active or semi-active systems<\/td><td>Tolling, industrial telemetry and proprietary systems<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The operating frequency alone does not define compatibility.<\/p>\n\n\n\n<p>Two products operating at 13.56 MHz may still use different communication protocols. Likewise, a UHF tag must support the appropriate air-interface standard and be correctly tuned for the target region.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Which Two Frequencies Should Be Combined?<\/h2>\n\n\n\n<p>The most suitable pairing depends on the application.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">HF\/NFC + UHF: The Most Versatile Commercial Combination<\/h3>\n\n\n\n<p>For product tracking, retail, logistics, authentication and consumer engagement, the most useful pairing is usually:<\/p>\n\n\n\n<p><strong>HF\/NFC at 13.56 MHz + UHF RFID at 860\u2013960 MHz<\/strong><\/p>\n\n\n\n<p>The two bands complement each other.<\/p>\n\n\n\n<p>UHF provides:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Longue distance de lecture<\/li>\n\n\n\n<li>Fast inventory counts<\/li>\n\n\n\n<li>Reading of multiple tags<\/li>\n\n\n\n<li>Conveyor and portal reading<\/li>\n\n\n\n<li>Automatisation des entrep\u00f4ts<\/li>\n\n\n\n<li>Item-level traceability<\/li>\n\n\n\n<li>Shipment verification<\/li>\n<\/ul>\n\n\n\n<p>HF\/NFC provides:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Smartphone access<\/li>\n\n\n\n<li>Intentional close-range reading<\/li>\n\n\n\n<li>Informations sur le produit<\/li>\n\n\n\n<li>Authentification<\/li>\n\n\n\n<li>Warranty registration<\/li>\n\n\n\n<li>Loyalty programmes<\/li>\n\n\n\n<li>Return verification<\/li>\n\n\n\n<li>Registres d'entretien<\/li>\n<\/ul>\n\n\n\n<p>This is the frequency combination used by EM4425.<\/p>\n\n\n\n<p>It is especially effective when a product must move through a business-to-business supply chain and later interact with an employee or consumer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">LF + HF\/NFC<\/h3>\n\n\n\n<p>An LF and HF\/NFC combination may be suitable when an existing identification system uses LF but a second interface is needed for smartphones, service personnel or newer equipment.<\/p>\n\n\n\n<p>Possible applications include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>R\u00e9f\u00e9rences d'acc\u00e8s<\/li>\n\n\n\n<li>Animal identification combined with local data access<\/li>\n\n\n\n<li>Industrial equipment migration<\/li>\n\n\n\n<li>Legacy identification systems<\/li>\n\n\n\n<li>Specialized security devices<\/li>\n<\/ul>\n\n\n\n<p>The disadvantages include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Two different antenna structures<\/li>\n\n\n\n<li>Limited benefit for warehouse bulk reading<\/li>\n\n\n\n<li>Greater tag size<\/li>\n\n\n\n<li>Higher production complexity<\/li>\n\n\n\n<li>Potential need for two separate chips<\/li>\n<\/ul>\n\n\n\n<p>Smartphones cannot normally read standard LF animal-identification transponders. Adding NFC can provide smartphone access, but the two identities must be mapped correctly.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">LF + UHF<\/h3>\n\n\n\n<p>LF and UHF may be combined when a product needs reliable close-range identity together with long-range tracking.<\/p>\n\n\n\n<p>Possible examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Livestock identification and automated movement tracking<\/li>\n\n\n\n<li>Reusable industrial containers<\/li>\n\n\n\n<li>Harsh-environment equipment<\/li>\n\n\n\n<li>Specialized asset-management systems<\/li>\n<\/ul>\n\n\n\n<p>For livestock, LF around 134.2 kHz is commonly associated with ISO 11784\/11785 animal identification, while UHF can support longer-range operational reading.<\/p>\n\n\n\n<p>However, a dual LF\/UHF livestock system introduces important questions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Which number is the official animal identity?<\/li>\n\n\n\n<li>Does the UHF number match the LF number?<\/li>\n\n\n\n<li>Is the device approved by the relevant livestock authority?<\/li>\n\n\n\n<li>Can the two interfaces remain associated for the life of the animal?<\/li>\n\n\n\n<li>Does UHF perform reliably around the animal\u2019s body and farm environment?<\/li>\n<\/ul>\n\n\n\n<p>EM4425 is not an LF animal-identification chip and does not provide an ISO 11784\/11785 interface.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">HF + UHF Without Smartphone Requirements<\/h3>\n\n\n\n<p>Some industrial systems combine ISO\/IEC 15693 HF with UHF because HF vicinity readers are already installed.<\/p>\n\n\n\n<p>This may be useful for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Gestion des outils<\/li>\n\n\n\n<li>Medical or laboratory assets<\/li>\n\n\n\n<li>Industrial maintenance<\/li>\n\n\n\n<li>Component assembly<\/li>\n\n\n\n<li>Production work-in-process<\/li>\n\n\n\n<li>Reusable transport items<\/li>\n<\/ul>\n\n\n\n<p>EM4425 supports ISO\/IEC 15693 HF operation as well as NFC Forum Type 5 functionality.<\/p>\n\n\n\n<p>This allows the same 13.56 MHz interface to support a compatible HF vicinity reader or an NFC device, depending on the implementation and chip version.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Is HF Plus NFC a Dual-Frequency Combination?<\/h2>\n\n\n\n<p>No, not by itself.<\/p>\n\n\n\n<p>HF RFID and NFC both operate at 13.56 MHz.<\/p>\n\n\n\n<p>They may use different protocols, commands, reading distances and device types, but they occupy the same frequency band.<\/p>\n\n\n\n<p>For example, EM4425 supports:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ISO\/IEC 15693 HF vicinity communication<\/li>\n\n\n\n<li>NFC Forum Type 5 Tag communication<\/li>\n\n\n\n<li>UHF RAIN RFID communication<\/li>\n<\/ul>\n\n\n\n<p>This gives the product several air-interface options, but it is still described as dual-frequency because it uses two physical frequency bands:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>13,56 MHz<\/li>\n\n\n\n<li>860\u2013960 MHz<\/li>\n<\/ul>\n\n\n\n<p>The HF and NFC functions generally use the same HF antenna connection.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Which Pairing Is Usually the Best?<\/h2>\n\n\n\n<p>For most item-level commercial projects, the best starting point is:<\/p>\n\n\n\n<p><strong>UHF RFID + HF\/NFC<\/strong><\/p>\n\n\n\n<p>This pairing is appropriate when the project requires both:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Automated operational tracking, and<\/li>\n\n\n\n<li>Close-range human interaction.<\/li>\n<\/ol>\n\n\n\n<p>It is less appropriate when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Only warehouse inventory is required<\/li>\n\n\n\n<li>Only a smartphone web link is required<\/li>\n\n\n\n<li>The product is extremely low-cost<\/li>\n\n\n\n<li>Available label space is very small<\/li>\n\n\n\n<li>The product contains metal or liquid that has not been considered in the antenna design<\/li>\n\n\n\n<li>The business has no plan for using the second interface<\/li>\n<\/ul>\n\n\n\n<p>A dual-frequency tag should not be selected simply because it offers more technology.<\/p>\n\n\n\n<p>Both interfaces should solve a defined business problem.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Is the EM4425 Chip?<\/h2>\n\n\n\n<p>EM4425 is the order code for the EM Microelectronic product known as <strong>em|echo-V<\/strong>.<\/p>\n\n\n\n<p>It is a passive dual-frequency RFID transponder IC designed to combine:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>RAIN RFID<\/li>\n\n\n\n<li>ISO\/IEC 15693 HF<\/li>\n\n\n\n<li>NFC Forum Type 5 Tag functionality<\/li>\n<\/ul>\n\n\n\n<p>The chip operates through two frequency ranges:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>HF\/NFC: 13.56 MHz<\/strong><\/li>\n\n\n\n<li><strong>UHF: 860\u2013960 MHz<\/strong><\/li>\n<\/ul>\n\n\n\n<p>The UHF interface is designed for long-range inventory and logistics applications. The HF and NFC interface supports vicinity or proximity interactions, including smartphone-based product services.<\/p>\n\n\n\n<p>EM Microelectronic describes the product as a RAINFC authenticity transponder IC because it connects RAIN RFID operations with NFC interaction and security functions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Is EM4425 One Chip or Two Chips?<\/h2>\n\n\n\n<p>EM4425 combines the supported functions on a single silicon die.<\/p>\n\n\n\n<p>This is different from placing one conventional NFC chip and one conventional UHF chip in the same label.<\/p>\n\n\n\n<p>A single-die implementation provides several advantages:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Shared chip identity<\/li>\n\n\n\n<li>Shared configurable memory<\/li>\n\n\n\n<li>Reduced risk of data mismatch<\/li>\n\n\n\n<li>One-step encoding options<\/li>\n\n\n\n<li>Coordinated security functions<\/li>\n\n\n\n<li>More integrated tag production<\/li>\n\n\n\n<li>A clearer link between the NFC and UHF records<\/li>\n<\/ul>\n\n\n\n<p>The tag still requires two antenna structures:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>An HF coil antenna<\/li>\n\n\n\n<li>A UHF antenna<\/li>\n<\/ul>\n\n\n\n<p>The chip provides separate terminals for the two antenna systems.<\/p>\n\n\n\n<p>A bare EM4425 chip does not provide useful reading performance by itself. The inlay designer must create and tune both antennas for the intended product, material and operating region.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">EM4425 Supported Standards<\/h2>\n\n\n\n<p>The EM4425 supports several standards across its two interfaces.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">HF and NFC interface<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ISO\/IEC 15693<\/li>\n\n\n\n<li>ISO\/IEC 18000-3 Mode 1<\/li>\n\n\n\n<li>NFC Forum Type 5 Tag<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">UHF interface<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ISO\/IEC 18000-63<\/li>\n\n\n\n<li>EPC Gen2v2<\/li>\n\n\n\n<li>RAIN RFID operation<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Security-related interface<\/h3>\n\n\n\n<p>The chip also supports functions associated with ISO\/IEC 29167-10, depending on the selected product configuration.<\/p>\n\n\n\n<p>This combination allows one tag to communicate with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Compatible HF readers<\/li>\n\n\n\n<li>Dispositifs compatibles NFC<\/li>\n\n\n\n<li>UHF EPC Gen2 readers<\/li>\n<\/ul>\n\n\n\n<p>The exact features available depend on the EM4425 version and how the chip is configured.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">EM4425 Is an NFC Type 5 Chip<\/h2>\n\n\n\n<p>EM4425 uses an ISO\/IEC 15693-based NFC Forum Type 5 interface.<\/p>\n\n\n\n<p>It should not be described as an NFC Forum Type 2 chip.<\/p>\n\n\n\n<p>Both Type 2 and Type 5 tags can support common NFC interactions, but their technical foundations are different.<\/p>\n\n\n\n<p>Type 5 is particularly relevant where the same HF interface may need to work with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Smartphones compatibles NFC<\/li>\n\n\n\n<li>ISO\/IEC 15693 vicinity readers<\/li>\n\n\n\n<li>Industrial HF readers<\/li>\n<\/ul>\n\n\n\n<p>Before production, the complete tag should be tested with the actual smartphones, applications and readers used in the project.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Shared Memory Across HF, NFC and UHF<\/h2>\n\n\n\n<p>One of the main features of EM4425 is configurable shared memory.<\/p>\n\n\n\n<p>The official product data specifies a total configurable memory area of 2,048 bits.<\/p>\n\n\n\n<p>The memory can be allocated for uses including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HF user memory<\/li>\n\n\n\n<li>UHF user memory<\/li>\n\n\n\n<li>UHF EPC or UII encoding<\/li>\n\n\n\n<li>Digital signature storage<\/li>\n<\/ul>\n\n\n\n<p>The UHF EPC\/UII section can be configured up to 480 bits, depending on the overall memory allocation.<\/p>\n\n\n\n<p>This is not the same as providing 2,048 bits independently to every interface. The available memory is partitioned according to the application requirements.<\/p>\n\n\n\n<p>For example, a project may allocate more memory to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A long UHF EPC<\/li>\n\n\n\n<li>NFC product information<\/li>\n\n\n\n<li>UHF user data<\/li>\n\n\n\n<li>Digital authentication information<\/li>\n<\/ul>\n\n\n\n<p>The memory plan should be defined before mass encoding.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Common IC Serial Number<\/h2>\n\n\n\n<p>EM4425 includes a common chip serial identity represented through:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A 64-bit UID on the HF side<\/li>\n\n\n\n<li>A 96-bit TID on the UHF side<\/li>\n<\/ul>\n\n\n\n<p>The common underlying identity helps connect data collected through the two interfaces.<\/p>\n\n\n\n<p>This is useful because the warehouse may read the UHF identity while the consumer later reads the NFC interface.<\/p>\n\n\n\n<p>The backend can associate both events with the same physical chip and product.<\/p>\n\n\n\n<p>However, users should not assume that the complete HF UID, UHF TID and EPC are visually identical.<\/p>\n\n\n\n<p>These memory structures serve different technical purposes. The database and encoding design must define how they are associated.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">One-Step Encoding<\/h2>\n\n\n\n<p>EM4425 allows tag encoding through either the HF or UHF interface.<\/p>\n\n\n\n<p>This can simplify production.<\/p>\n\n\n\n<p>A converter or product manufacturer may be able to configure shared data without programming two independent chips through two separate processes.<\/p>\n\n\n\n<p>Benefits may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lower encoding complexity<\/li>\n\n\n\n<li>Fewer matching errors<\/li>\n\n\n\n<li>Easier serialization<\/li>\n\n\n\n<li>More consistent digital identity<\/li>\n\n\n\n<li>Improved production traceability<\/li>\n<\/ul>\n\n\n\n<p>The encoding station must still use software and readers that support the required commands and memory configuration.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">EM4425 Security Features<\/h2>\n\n\n\n<p>EM4425 includes more than basic identification.<\/p>\n\n\n\n<p>Depending on the ordered version and configuration, available functions include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>AES-128 cryptography<\/li>\n\n\n\n<li>NFC web-based authentication<\/li>\n\n\n\n<li>Digital signature<\/li>\n\n\n\n<li>Password-protected memory<\/li>\n\n\n\n<li>Random ID options<\/li>\n\n\n\n<li>Customer-privacy controls<\/li>\n\n\n\n<li>Access counters<\/li>\n\n\n\n<li>UHF privacy controls<\/li>\n\n\n\n<li>D\u00e9tection de sabotage<\/li>\n\n\n\n<li>Tamper alarm reporting<\/li>\n<\/ul>\n\n\n\n<p>These functions make the chip relevant for product authentication and brand protection.<\/p>\n\n\n\n<p>However, using a security-capable chip does not automatically produce a secure application.<\/p>\n\n\n\n<p>A complete security system also requires:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Secure key generation<\/li>\n\n\n\n<li>Protected key injection<\/li>\n\n\n\n<li>Controlled tag personalization<\/li>\n\n\n\n<li>Backend validation<\/li>\n\n\n\n<li>Secure domain and web infrastructure<\/li>\n\n\n\n<li>Anti-replay logic<\/li>\n\n\n\n<li>Event monitoring<\/li>\n\n\n\n<li>Contr\u00f4le d'acc\u00e8s<\/li>\n\n\n\n<li>Procedures for compromised keys<\/li>\n<\/ul>\n\n\n\n<p>A tag programmed only with a static URL does not gain strong authentication merely because the underlying chip supports AES.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tamper-Detection Capability<\/h2>\n\n\n\n<p>EM4425 provides connections for a tamper loop.<\/p>\n\n\n\n<p>The loop can be integrated into a label or seal so that the chip can determine whether the conductive path remains intact or has been broken.<\/p>\n\n\n\n<p>Les applications potentielles sont les suivantes :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Package-opening detection<\/li>\n\n\n\n<li>Warranty seals<\/li>\n\n\n\n<li>Emballage pharmaceutique<\/li>\n\n\n\n<li>Electronic product seals<\/li>\n\n\n\n<li>Automotive components<\/li>\n\n\n\n<li>Return fraud prevention<\/li>\n\n\n\n<li>High-value goods<\/li>\n<\/ul>\n\n\n\n<p>When a user reads the tag through NFC or UHF, the system may report the tamper state.<\/p>\n\n\n\n<p>The label converter must design the physical tamper loop correctly. The IC alone cannot detect package opening unless the loop is integrated into the tag construction and positioned across the intended opening point.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">EM4425 Memory Endurance and Operating Conditions<\/h2>\n\n\n\n<p>The official short data sheet specifies:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>At least 100,000 write cycles<\/li>\n\n\n\n<li>At least 50 years of data retention under the stated conditions<\/li>\n\n\n\n<li>An operating-temperature range from \u221240\u00b0C to +85\u00b0C<\/li>\n<\/ul>\n\n\n\n<p>These are chip-level specifications.<\/p>\n\n\n\n<p>The finished label may have a narrower operating range because of:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Adhesive<\/li>\n\n\n\n<li>PET or paper face material<\/li>\n\n\n\n<li>Antenne en aluminium ou en cuivre<\/li>\n\n\n\n<li>Protective laminate<\/li>\n\n\n\n<li>Printing ink<\/li>\n\n\n\n<li>Tamper-loop construction<\/li>\n\n\n\n<li>Emballage du produit<\/li>\n<\/ul>\n\n\n\n<p>The durability of a finished RFID label should therefore be evaluated from the complete tag specification, not only from the IC data sheet.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does EM4425 Do Through UHF?<\/h2>\n\n\n\n<p>Through its UHF interface, EM4425 can support functions such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Item-level inventory<\/li>\n\n\n\n<li>Warehouse counting<\/li>\n\n\n\n<li>Receiving and shipping verification<\/li>\n\n\n\n<li>Retail stock visibility<\/li>\n\n\n\n<li>Product return processing<\/li>\n\n\n\n<li>Suivi des actifs<\/li>\n\n\n\n<li>Supply-chain event capture<\/li>\n\n\n\n<li>Identification automatis\u00e9e<\/li>\n\n\n\n<li>Tamper-state collection<\/li>\n<\/ul>\n\n\n\n<p>UHF RFID allows multiple tagged products to be read without requiring direct line of sight.<\/p>\n\n\n\n<p>Actual reading distance depends on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Inlay dimensions<\/li>\n\n\n\n<li>UHF antenna design<\/li>\n\n\n\n<li>Puissance de lecture<\/li>\n\n\n\n<li>Reader antenna<\/li>\n\n\n\n<li>Regional frequency<\/li>\n\n\n\n<li>Product material<\/li>\n\n\n\n<li>Tag orientation<\/li>\n\n\n\n<li>Nearby tags<\/li>\n\n\n\n<li>Metal and liquid<\/li>\n\n\n\n<li>Installation environment<\/li>\n<\/ul>\n\n\n\n<p>The chip\u2019s input sensitivity is not the same as a guaranteed finished-tag reading distance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does EM4425 Do Through NFC?<\/h2>\n\n\n\n<p>Through NFC, a user may tap the tag with a compatible device to access:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Authentification du produit<\/li>\n\n\n\n<li>Informations sur le produit<\/li>\n\n\n\n<li>Digital instructions<\/li>\n\n\n\n<li>Warranty registration<\/li>\n\n\n\n<li>Loyalty programmes<\/li>\n\n\n\n<li>Coupons<\/li>\n\n\n\n<li>Reorder pages<\/li>\n\n\n\n<li>Recycling information<\/li>\n\n\n\n<li>Return verification<\/li>\n\n\n\n<li>Registres d'entretien<\/li>\n\n\n\n<li>Tamper status<\/li>\n<\/ul>\n\n\n\n<p>The NFC interaction is deliberate and close-range.<\/p>\n\n\n\n<p>This makes it useful when a business wants the user to interact with one specific item rather than every nearby tagged item.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Typical EM4425 Applications<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">Commerce de d\u00e9tail et mode<\/h2>\n\n\n\n<p>A dual-frequency label can support UHF inventory throughout the retail supply chain and NFC engagement after the product reaches the customer.<\/p>\n\n\n\n<p>Possible functions include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Factory serialization<\/li>\n\n\n\n<li>Distribution-center receiving<\/li>\n\n\n\n<li>Store inventory<\/li>\n\n\n\n<li>Checkout support<\/li>\n\n\n\n<li>Authentification du produit<\/li>\n\n\n\n<li>Care instructions<\/li>\n\n\n\n<li>Loyalty registration<\/li>\n\n\n\n<li>Returns management<\/li>\n\n\n\n<li>Resale verification<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Luxury Goods and Brand Protection<\/h2>\n\n\n\n<p>UHF can provide supply-chain visibility, while NFC can provide a customer-facing authenticity check.<\/p>\n\n\n\n<p>The shared chip identity makes it easier to connect operational records and consumer interactions.<\/p>\n\n\n\n<p>Products may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Handbags<\/li>\n\n\n\n<li>Chaussures<\/li>\n\n\n\n<li>Watches<\/li>\n\n\n\n<li>Accessoires<\/li>\n\n\n\n<li>Collectibles<\/li>\n\n\n\n<li>Premium apparel<\/li>\n<\/ul>\n\n\n\n<p>The security architecture should be designed to prevent simple URL copying and replay.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pharmaceuticals and Healthcare Packaging<\/h2>\n\n\n\n<p>Les applications potentielles sont les suivantes :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Visibilit\u00e9 des stocks<\/li>\n\n\n\n<li>Package verification<\/li>\n\n\n\n<li>Informations sur le produit<\/li>\n\n\n\n<li>D\u00e9tection de sabotage<\/li>\n\n\n\n<li>Authentification<\/li>\n\n\n\n<li>Returns processing<\/li>\n\n\n\n<li>Recall management<\/li>\n<\/ul>\n\n\n\n<p>RFID usage in pharmaceutical and medical environments may be subject to regulatory, material and validation requirements. The EM4425 data sheet also places restrictions on using the chip as a component in safety-critical medical devices.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Industrial Components<\/h2>\n\n\n\n<p>An industrial component may be identified automatically through UHF while a technician uses NFC for intentional access to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Installation instructions<\/li>\n\n\n\n<li>Maintenance history<\/li>\n\n\n\n<li>Part authentication<\/li>\n\n\n\n<li>Safety documentation<\/li>\n\n\n\n<li>Inspection forms<\/li>\n\n\n\n<li>Warranty data<\/li>\n<\/ul>\n\n\n\n<p>Voici quelques exemples :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pompes<\/li>\n\n\n\n<li>Motors<\/li>\n\n\n\n<li>Tools<\/li>\n\n\n\n<li>Spare parts<\/li>\n\n\n\n<li>Electrical components<\/li>\n\n\n\n<li>Automotive assemblies<\/li>\n\n\n\n<li>Aerospace components<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Automotive and Aerospace Logistics<\/h2>\n\n\n\n<p>EM Microelectronic identifies automotive and aerospace logistics as target applications.<\/p>\n\n\n\n<p>UHF can support:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Parts inventory<\/li>\n\n\n\n<li>Production flow<\/li>\n\n\n\n<li>Container verification<\/li>\n\n\n\n<li>Shipment tracking<\/li>\n<\/ul>\n\n\n\n<p>HF\/NFC can support:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maintenance access<\/li>\n\n\n\n<li>Part-level inspection<\/li>\n\n\n\n<li>Authentification<\/li>\n\n\n\n<li>Controlled service information<\/li>\n<\/ul>\n\n\n\n<p>The finished tag must be qualified for the required heat, chemicals, vibration, flame resistance and lifecycle conditions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Product Returns and Circular Economy<\/h2>\n\n\n\n<p>A dual-frequency tag can remain useful after the original sale.<\/p>\n\n\n\n<p>UHF may help a warehouse process returned items in volume, while NFC may allow a customer, technician or reseller to access the individual product record.<\/p>\n\n\n\n<p>Les applications comprennent :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Product returns<\/li>\n\n\n\n<li>Repair<\/li>\n\n\n\n<li>Refurbishment<\/li>\n\n\n\n<li>Rental products<\/li>\n\n\n\n<li>Resale<\/li>\n\n\n\n<li>Recycling<\/li>\n\n\n\n<li>Deposit-return systems<\/li>\n\n\n\n<li>Reusable packaging<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">EM4425 vs Separate NFC and UHF Chips<\/h2>\n\n\n\n<p>A dual-frequency tag can be made either with EM4425 or with two independent RFID chips.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Facteur<\/th><th>EM4425 single-die design<\/th><th>Separate NFC and UHF chips<\/th><\/tr><\/thead><tbody><tr><td>Chip count<\/td><td>One<\/td><td>Two<\/td><\/tr><tr><td>Antenna systems<\/td><td>Two<\/td><td>Two<\/td><\/tr><tr><td>Memory relationship<\/td><td>Shared and configurable<\/td><td>Usually separate<\/td><\/tr><tr><td>Identity relationship<\/td><td>Common IC identity<\/td><td>Must be matched in database<\/td><\/tr><tr><td>Encodage<\/td><td>Can support one-step encoding<\/td><td>Usually two encoding processes<\/td><\/tr><tr><td>Data mismatch risk<\/td><td>Lower with correct configuration<\/td><td>Higher if records are not matched<\/td><\/tr><tr><td>Feature flexibility<\/td><td>Defined by EM4425 architecture<\/td><td>Chips can be selected independently<\/td><\/tr><tr><td>Sourcing<\/td><td>Dependent on one dual-frequency IC<\/td><td>Broader individual-chip options<\/td><\/tr><tr><td>Inlay design<\/td><td>Sp\u00e9cialis\u00e9<\/td><td>Also specialized<\/td><\/tr><tr><td>S\u00e9curit\u00e9<\/td><td>Integrated features available<\/td><td>Depends on selected chips<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Separate chips may be appropriate when the project requires:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A specific NFC security chip<\/li>\n\n\n\n<li>A specific high-performance UHF chip<\/li>\n\n\n\n<li>Independent memory<\/li>\n\n\n\n<li>Independent identities<\/li>\n\n\n\n<li>A feature not available in one dual-frequency IC<\/li>\n<\/ul>\n\n\n\n<p>EM4425 is attractive when a unified identity and shared memory are more important.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Antenna Design Is Critical<\/h2>\n\n\n\n<p>Selecting EM4425 does not complete the product design.<\/p>\n\n\n\n<p>The finished inlay must contain both:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A correctly tuned 13.56 MHz HF antenna<\/li>\n\n\n\n<li>A correctly tuned UHF antenna<\/li>\n<\/ul>\n\n\n\n<p>The two antenna systems must fit within the available label dimensions without unacceptable interaction.<\/p>\n\n\n\n<p>Design considerations include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HF coil size<\/li>\n\n\n\n<li>Number of HF coil turns<\/li>\n\n\n\n<li>UHF dipole dimensions<\/li>\n\n\n\n<li>Chip impedance<\/li>\n\n\n\n<li>Coupling between antennas<\/li>\n\n\n\n<li>Label orientation<\/li>\n\n\n\n<li>Product dielectric properties<\/li>\n\n\n\n<li>Regional UHF tuning<\/li>\n\n\n\n<li>Tamper-loop layout<\/li>\n\n\n\n<li>Manufacturing tolerances<\/li>\n<\/ul>\n\n\n\n<p>A poorly designed dual-frequency inlay may have acceptable NFC performance but weak UHF performance, or the reverse.<\/p>\n\n\n\n<p>Both interfaces should be tested independently and as a complete product.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Regional UHF Frequency Differences<\/h2>\n\n\n\n<p>The EM4425 UHF interface operates across the 860\u2013960 MHz range at chip level.<\/p>\n\n\n\n<p>However, countries use different regulatory sub-bands.<\/p>\n\n\n\n<p>Common examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>European ETSI region around 865\u2013868 MHz<\/li>\n\n\n\n<li>United States FCC region around 902\u2013928 MHz<\/li>\n\n\n\n<li>Other national allocations within the broader UHF range<\/li>\n<\/ul>\n\n\n\n<p>The inlay antenna may be:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Optimized for Europe<\/li>\n\n\n\n<li>Optimized for North America<\/li>\n\n\n\n<li>Designed as a global or broadband antenna<\/li>\n<\/ul>\n\n\n\n<p>A global inlay offers deployment flexibility, but its peak performance may differ from that of a region-specific design.<\/p>\n\n\n\n<p>The supplier should state:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Intended UHF region<\/li>\n\n\n\n<li>Inlay dimensions<\/li>\n\n\n\n<li>Reference reading distance<\/li>\n\n\n\n<li>Test material<\/li>\n\n\n\n<li>Configuration du lecteur<\/li>\n\n\n\n<li>Orientation<\/li>\n\n\n\n<li>Whether the label is suitable for worldwide use<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">The Effect of Metal and Liquid<\/h2>\n\n\n\n<p>Metal and liquid can change the performance of both interfaces.<\/p>\n\n\n\n<p>UHF is particularly sensitive to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Water-rich products<\/li>\n\n\n\n<li>Boissons<\/li>\n\n\n\n<li>Cosm\u00e9tiques<\/li>\n\n\n\n<li>Human bodies<\/li>\n\n\n\n<li>Metal packaging<\/li>\n\n\n\n<li>Electronic equipment<\/li>\n\n\n\n<li>Piles<\/li>\n<\/ul>\n\n\n\n<p>HF\/NFC can also be detuned by metal.<\/p>\n\n\n\n<p>When the tag is mounted on metal, the design may require:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A ferrite layer<\/li>\n\n\n\n<li>A foam spacer<\/li>\n\n\n\n<li>A specialized on-metal antenna<\/li>\n\n\n\n<li>A hard-tag housing<\/li>\n\n\n\n<li>Product-specific tuning<\/li>\n<\/ul>\n\n\n\n<p>A standard paper EM4425 label should not be assumed to work directly on a metal container.<\/p>\n\n\n\n<p>For liquid products, the tag location and spacing should be tested on the filled package, not only on an empty sample.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Reading Distance Is Different on the Two Interfaces<\/h2>\n\n\n\n<p>A dual-frequency tag does not provide one common reading distance.<\/p>\n\n\n\n<p>The UHF interface may be read from several meters under suitable conditions.<\/p>\n\n\n\n<p>The NFC interface is intended for close interaction, generally requiring the phone or reader to be placed near the tag.<\/p>\n\n\n\n<p>The HF ISO\/IEC 15693 interface may provide a longer vicinity range than ordinary smartphone NFC when used with a suitable industrial HF reader and antenna.<\/p>\n\n\n\n<p>Actual performance depends on the finished inlay and reader.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Does EM4425 Require a Battery?<\/h2>\n\n\n\n<p>No. EM4425 is intended for passive transponder applications.<\/p>\n\n\n\n<p>It receives energy from the HF, NFC or UHF reader field.<\/p>\n\n\n\n<p>This provides:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>No battery replacement<\/li>\n\n\n\n<li>Thin label construction<\/li>\n\n\n\n<li>Long storage life<\/li>\n\n\n\n<li>Lower maintenance<\/li>\n\n\n\n<li>Suitability for disposable packaging<\/li>\n<\/ul>\n\n\n\n<p>A passive tag does not transmit continuously. It responds only when energized by a compatible reader.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Can UHF and NFC Be Read at the Same Time?<\/h2>\n\n\n\n<p>Both interfaces can access shared memory, but the official product documentation states that the memory is not accessed in parallel.<\/p>\n\n\n\n<p>When commands arrive over both interfaces, memory access is arbitrated on a command basis.<\/p>\n\n\n\n<p>In normal deployments, this is rarely a practical limitation because warehouse UHF reading and consumer NFC tapping usually occur at different times.<\/p>\n\n\n\n<p>A system should not assume that two readers can simultaneously modify the same memory area without coordination.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Can NFC Change UHF Data?<\/h2>\n\n\n\n<p>EM4425 can be configured so that the HF\/NFC interface accesses shared memory and controls certain UHF privacy functions.<\/p>\n\n\n\n<p>This creates useful workflows, but it also requires careful access-control design.<\/p>\n\n\n\n<p>For example, a smartphone interaction should not be allowed to overwrite critical EPC or logistics information unless that behavior is explicitly intended and protected.<\/p>\n\n\n\n<p>Memory areas may need:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Protection par mot de passe<\/li>\n\n\n\n<li>Permanent locking<\/li>\n\n\n\n<li>Permissions d'acc\u00e8s<\/li>\n\n\n\n<li>Controlled software commands<\/li>\n\n\n\n<li>Backend authorization<\/li>\n<\/ul>\n\n\n\n<p>The encoding plan should define which data is:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Publicly readable<\/li>\n\n\n\n<li>Password-protected<\/li>\n\n\n\n<li>Permanently locked<\/li>\n\n\n\n<li>Editable through UHF<\/li>\n\n\n\n<li>Editable through HF\/NFC<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Is EM4425 Suitable for Anti-Counterfeiting?<\/h2>\n\n\n\n<p>It can be part of an anti-counterfeiting system.<\/p>\n\n\n\n<p>Relevant features include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Common chip identity<\/li>\n\n\n\n<li>AES-128 support<\/li>\n\n\n\n<li>NFC web authentication<\/li>\n\n\n\n<li>Digital signature<\/li>\n\n\n\n<li>D\u00e9tection de sabotage<\/li>\n\n\n\n<li>Access counters<\/li>\n\n\n\n<li>Protection par mot de passe<\/li>\n<\/ul>\n\n\n\n<p>However, anti-counterfeiting effectiveness depends on implementation.<\/p>\n\n\n\n<p>A static NFC URL can be copied to another tag. A printed QR code can also be copied. Stronger protection requires dynamic or cryptographic validation linked to the backend.<\/p>\n\n\n\n<p>The project should define:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Threat model<\/li>\n\n\n\n<li>Authentication flow<\/li>\n\n\n\n<li>Key ownership<\/li>\n\n\n\n<li>Tag-personalization process<\/li>\n\n\n\n<li>Server-validation method<\/li>\n\n\n\n<li>Response to repeated or suspicious scans<\/li>\n\n\n\n<li>Tamper-event handling<\/li>\n\n\n\n<li>Data privacy policy<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">When Should You Choose EM4425?<\/h2>\n\n\n\n<p>EM4425 is a strong candidate when the same product requires:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>UHF supply-chain tracking<\/li>\n\n\n\n<li>Interaction NFC avec le smartphone<\/li>\n\n\n\n<li>Shared identity between channels<\/li>\n\n\n\n<li>Shared configurable memory<\/li>\n\n\n\n<li>Authentification du produit<\/li>\n\n\n\n<li>D\u00e9tection de sabotage<\/li>\n\n\n\n<li>Long-term product information<\/li>\n\n\n\n<li>Returns or circular-economy workflows<\/li>\n<\/ul>\n\n\n\n<p>It is especially suitable when both business users and end users need to interact with the same tag.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">When Is EM4425 Unnecessary?<\/h2>\n\n\n\n<p>A less complex chip may be more economical when the application requires only:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>UHF warehouse inventory<\/li>\n\n\n\n<li>A basic NFC URL<\/li>\n\n\n\n<li>Standard access control<\/li>\n\n\n\n<li>LF animal identification<\/li>\n\n\n\n<li>A one-time identification number<\/li>\n\n\n\n<li>A low-cost disposable label with no second workflow<\/li>\n<\/ul>\n\n\n\n<p>Adding dual-frequency capability increases:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Chip cost<\/li>\n\n\n\n<li>Inlay complexity<\/li>\n\n\n\n<li>Antenna area<\/li>\n\n\n\n<li>Conversion requirements<\/li>\n\n\n\n<li>Testing requirements<\/li>\n\n\n\n<li>Software integration work<\/li>\n<\/ul>\n\n\n\n<p>The second frequency should provide measurable operational or customer value.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">EM4425 Is Not an Animal RFID Chip<\/h2>\n\n\n\n<p>EM4425 should not be confused with ISO 11784\/11785 livestock chips.<\/p>\n\n\n\n<p>Animal identification commonly uses low frequency around 134.2 kHz with FDX-B or HDX protocols.<\/p>\n\n\n\n<p>EM4425 uses:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>13.56 MHz HF\/NFC<\/li>\n\n\n\n<li>860\u2013960 MHz UHF<\/li>\n<\/ul>\n\n\n\n<p>It is designed primarily for item management, supply-chain tracking, authentication and consumer engagement.<\/p>\n\n\n\n<p>It is not a replacement for an approved cattle ear-tag, microchip or rumen-bolus transponder under an official livestock traceability programme.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Specify an EM4425 Dual-Frequency Tag<\/h2>\n\n\n\n<p>A clear request for quotation should include the following information.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Demande<\/h3>\n\n\n\n<p>Explain whether the label is intended for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Inventaire du commerce de d\u00e9tail<\/li>\n\n\n\n<li>Authentification du produit<\/li>\n\n\n\n<li>Industrial tracking<\/li>\n\n\n\n<li>Engagement des consommateurs<\/li>\n\n\n\n<li>D\u00e9tection de sabotage<\/li>\n\n\n\n<li>Automotive parts<\/li>\n\n\n\n<li>Emballage pharmaceutique<\/li>\n\n\n\n<li>Returns management<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Product Material<\/h3>\n\n\n\n<p>Specify whether the label will be applied to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cardboard<\/li>\n\n\n\n<li>Plastique<\/li>\n\n\n\n<li>Verre<\/li>\n\n\n\n<li>Metal<\/li>\n\n\n\n<li>Liquid packaging<\/li>\n\n\n\n<li>Textile<\/li>\n\n\n\n<li>\u00c9lectronique<\/li>\n\n\n\n<li>Bois<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Tag Dimensions<\/h3>\n\n\n\n<p>Provide the available:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Longueur<\/li>\n\n\n\n<li>Width<\/li>\n\n\n\n<li>Maximum thickness<\/li>\n\n\n\n<li>Placement area<\/li>\n\n\n\n<li>Orientation<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">UHF Region<\/h3>\n\n\n\n<p>State the intended markets:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Europe<\/li>\n\n\n\n<li>North America<\/li>\n\n\n\n<li>Asia<\/li>\n\n\n\n<li>Global<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">NFC Function<\/h3>\n\n\n\n<p>Define whether NFC will provide:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Static URL<\/li>\n\n\n\n<li>Authentification<\/li>\n\n\n\n<li>Informations sur le produit<\/li>\n\n\n\n<li>Warranty registration<\/li>\n\n\n\n<li>App interaction<\/li>\n\n\n\n<li>Loyalty programme<\/li>\n\n\n\n<li>Tamper status<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Memory Allocation<\/h3>\n\n\n\n<p>Define the required:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>EPC length<\/li>\n\n\n\n<li>UHF user memory<\/li>\n\n\n\n<li>HF user memory<\/li>\n\n\n\n<li>Digital signature<\/li>\n\n\n\n<li>NDEF content<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">S\u00e9curit\u00e9<\/h3>\n\n\n\n<p>Specify whether the project requires:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>AES authentication<\/li>\n\n\n\n<li>Protection par mot de passe<\/li>\n\n\n\n<li>Tamper loop<\/li>\n\n\n\n<li>Access counter<\/li>\n\n\n\n<li>Mode de confidentialit\u00e9<\/li>\n\n\n\n<li>Locked EPC<\/li>\n\n\n\n<li>Backend verification<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Production Services<\/h3>\n\n\n\n<p>Confirm whether the supplier must provide:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>UHF encoding<\/li>\n\n\n\n<li>NFC encoding<\/li>\n\n\n\n<li>Variable printing<\/li>\n\n\n\n<li>Code QR<\/li>\n\n\n\n<li>Serial-number matching<\/li>\n\n\n\n<li>Tamper-loop conversion<\/li>\n\n\n\n<li>Database file<\/li>\n\n\n\n<li>Verification report<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Test an EM4425 Tag<\/h2>\n\n\n\n<p>Testing should cover both interfaces separately.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">UHF Tests<\/h2>\n\n\n\n<p>Mesure :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Distance de lecture<\/li>\n\n\n\n<li>Bulk-reading rate<\/li>\n\n\n\n<li>Sensibilit\u00e9 \u00e0 l'orientation<\/li>\n\n\n\n<li>Portal performance<\/li>\n\n\n\n<li>Carton performance<\/li>\n\n\n\n<li>Regional frequency response<\/li>\n\n\n\n<li>Performance on the final product<\/li>\n\n\n\n<li>Performance near metal or liquid<\/li>\n\n\n\n<li>EPC and user-memory accuracy<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">HF and NFC Tests<\/h2>\n\n\n\n<p>Mesure :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Compatibilit\u00e9 avec les smartphones<\/li>\n\n\n\n<li>Tap position<\/li>\n\n\n\n<li>NDEF reading<\/li>\n\n\n\n<li>ISO\/IEC 15693 reader performance<\/li>\n\n\n\n<li>Authentication response<\/li>\n\n\n\n<li>Password-protected access<\/li>\n\n\n\n<li>Access counter<\/li>\n\n\n\n<li>Exp\u00e9rience de l'utilisateur<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Shared-Memory Tests<\/h2>\n\n\n\n<p>Confirm:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>UHF and NFC records refer to the same product<\/li>\n\n\n\n<li>Memory allocation is correct<\/li>\n\n\n\n<li>Locked areas cannot be changed<\/li>\n\n\n\n<li>Intended areas remain writable<\/li>\n\n\n\n<li>Encoding files match printed information<\/li>\n\n\n\n<li>Backend records match the chip identity<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Tamper Tests<\/h2>\n\n\n\n<p>Confirm:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The loop is intact before opening<\/li>\n\n\n\n<li>Opening the package breaks the intended path<\/li>\n\n\n\n<li>The chip records or reports the correct state<\/li>\n\n\n\n<li>The broken loop cannot be easily restored<\/li>\n\n\n\n<li>NFC and UHF readers both receive the expected status<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Environmental Tests<\/h2>\n\n\n\n<p>Depending on the application, test:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Chaleur<\/li>\n\n\n\n<li>Cold<\/li>\n\n\n\n<li>Humidit\u00e9<\/li>\n\n\n\n<li>Exposition aux UV<\/li>\n\n\n\n<li>Abrasion<\/li>\n\n\n\n<li>Produits chimiques<\/li>\n\n\n\n<li>Flexing<\/li>\n\n\n\n<li>Package opening<\/li>\n\n\n\n<li>Adhesive aging<\/li>\n\n\n\n<li>Transport vibration<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Final Answer: Which Dual-Frequency Combination Is Best?<\/h2>\n\n\n\n<p>For most retail, supply-chain, authentication and consumer-engagement applications, the most useful pairing is:<\/p>\n\n\n\n<p><strong>13.56 MHz HF\/NFC + 860\u2013960 MHz UHF RFID<\/strong><\/p>\n\n\n\n<p>UHF provides long-range bulk identification. HF\/NFC provides close-range access through smartphones and industrial readers.<\/p>\n\n\n\n<p>LF combinations may be appropriate for animal identification, access control or legacy industrial systems, but they do not provide the same balance of supply-chain automation and consumer interaction.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Final Answer: What Is EM4425?<\/h2>\n\n\n\n<p>EM4425, also called em|echo-V, is a passive dual-frequency RFID chip from EM Microelectronic.<\/p>\n\n\n\n<p>It combines:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ISO\/IEC 15693 HF<\/li>\n\n\n\n<li>NFC Forum Type 5<\/li>\n\n\n\n<li>ISO\/IEC 18000-63 UHF<\/li>\n\n\n\n<li>EPC Gen2v2<\/li>\n\n\n\n<li>Shared configurable memory<\/li>\n\n\n\n<li>A common IC identity<\/li>\n\n\n\n<li>Optional AES-128 authentication<\/li>\n\n\n\n<li>Digital signature<\/li>\n\n\n\n<li>Protection par mot de passe<\/li>\n\n\n\n<li>D\u00e9tection de sabotage<\/li>\n<\/ul>\n\n\n\n<p>It is designed to connect long-range RAIN RFID operations with close-range HF and NFC interactions.<\/p>\n\n\n\n<p>The chip is most valuable when one physical item must be tracked throughout the supply chain and later accessed by a customer, technician or other authorized user.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Questions fr\u00e9quemment pos\u00e9es<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What two frequencies does EM4425 use?<\/h3>\n\n\n\n<p>EM4425 uses 13.56 MHz for its HF and NFC interface and supports UHF operation across the 860\u2013960 MHz range.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is EM4425 an NFC and UHF chip?<\/h3>\n\n\n\n<p>Yes. It combines NFC Forum Type 5 and ISO\/IEC 15693 HF functionality with RAIN UHF RFID.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is EM4425 an NFC Type 2 chip?<\/h3>\n\n\n\n<p>No. EM4425 supports NFC Forum Type 5 Tag functionality based on ISO\/IEC 15693.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does EM4425 contain two separate chips?<\/h3>\n\n\n\n<p>No. The supported interfaces are integrated on one silicon die. The finished inlay still requires separate HF and UHF antenna structures.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does EM4425 have shared memory?<\/h3>\n\n\n\n<p>Yes. It provides 2,048 bits of configurable memory that can be allocated among HF user memory, UHF user memory, EPC\/UII and digital-signature functions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can an EM4425 label be read by a smartphone?<\/h3>\n\n\n\n<p>The NFC interface is designed for compatible NFC devices. Smartphone compatibility should be tested with the selected EM4425 version, NDEF configuration, phone models and software.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can EM4425 be read from several meters away?<\/h3>\n\n\n\n<p>The UHF interface can support long-range reading when connected to a suitable UHF antenna. Actual distance depends on the inlay, product, reader, region and environment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does the chip require a battery?<\/h3>\n\n\n\n<p>No. EM4425 is a passive transponder chip powered by the reader field.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can the UHF and NFC interfaces use the same product number?<\/h3>\n\n\n\n<p>They can be linked through the shared memory and common chip identity. The EPC, UHF TID and HF UID are different technical fields, so the data architecture must define how they are associated.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can EM4425 be used on metal?<\/h3>\n\n\n\n<p>Not as a standard general-purpose paper inlay without testing. Metal can detune both antenna systems. An on-metal construction, ferrite layer, spacer or specialized antenna may be required.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can EM4425 detect package opening?<\/h3>\n\n\n\n<p>It supports a tamper-loop interface. The label converter must integrate a physical conductive loop into the package or seal.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is EM4425 suitable for cattle ear tags?<\/h3>\n\n\n\n<p>It is not a standard ISO 11784\/11785 low-frequency livestock identification chip. Official cattle identification normally requires approved LF animal transponders.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is UHF plus NFC always worth the extra cost?<\/h3>\n\n\n\n<p>No. Dual frequency is justified when the project needs both automated long-range tracking and close-range interaction. A single-frequency tag is usually more economical when only one workflow is required.<\/p>","protected":false},"excerpt":{"rendered":"<p>A conventional RFID tag normally operates in one frequency band. A low-frequency animal tag may operate around 134.2 kHz. An NFC label operates at 13.56 MHz. A supply-chain UHF RFID label typically operates within the 860\u2013960 MHz range. A dual-frequency RFID tag combines two RFID interfaces in one product so that the same physical item [&hellip;]<\/p>","protected":false},"author":1,"featured_media":5761,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[269],"tags":[],"class_list":["post-5760","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-rfid-chips"],"acf":[],"_links":{"self":[{"href":"https:\/\/rfid-pro.com\/fr\/wp-json\/wp\/v2\/posts\/5760","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rfid-pro.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rfid-pro.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rfid-pro.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rfid-pro.com\/fr\/wp-json\/wp\/v2\/comments?post=5760"}],"version-history":[{"count":2,"href":"https:\/\/rfid-pro.com\/fr\/wp-json\/wp\/v2\/posts\/5760\/revisions"}],"predecessor-version":[{"id":5763,"href":"https:\/\/rfid-pro.com\/fr\/wp-json\/wp\/v2\/posts\/5760\/revisions\/5763"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rfid-pro.com\/fr\/wp-json\/wp\/v2\/media\/5761"}],"wp:attachment":[{"href":"https:\/\/rfid-pro.com\/fr\/wp-json\/wp\/v2\/media?parent=5760"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rfid-pro.com\/fr\/wp-json\/wp\/v2\/categories?post=5760"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rfid-pro.com\/fr\/wp-json\/wp\/v2\/tags?post=5760"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}