Which RFID Chip for Which Application

Start with the application, not the chip

A common question to RFID suppliers is "Which is the best chip?" There is no single best chip - only the best chip for a given job. A chip that is ideal for apparel labels may be useless on a metal server rack, and a secure NFC chip is wasted on a carton that is read once at a dock door.

The right order of decisions is:

1. Define the job: what is tagged, how many items, how far away, how fast, and who or what reads it (fixed reader, handheld, smartphone).
2. Choose the frequency band: LF, HF/NFC or UHF, based on range, environment and reader type. See RFID Frequencies for the physics.
3. Choose the tag form: paper label, wet inlay, on-metal hard tag, laundry tag, card, wristband, windshield sticker and so on. The Types of RFID Tags chapter covers these.
4. Choose the chip inside: based on memory, security, sensitivity and compatibility with your ecosystem (for example a retailer's approved list).
5. Test the finished tags on real items before buying in volume.

The chip families named in this chapter are explained in RFID Chips Explained. The examples below are typical choices, not the only correct ones; many equivalent chips exist.

Application selection table

Finished tags for most of these applications are available in our UHF RFID labels, NFC tags, RFID hard tags, wristbands and cards ranges.

In the real world

Notes on key applications

Retail and supply chain

Retail tagging is driven by volume and cost. Most retail programmes specify UHF EPC Gen2 labels with a serialised GTIN (SGTIN-96) in the EPC bank and no need for user memory. Large retailers often publish approved inlay lists and performance requirements, so check the buyer's specification first. For cartons and pallets, the EPC usually carries an SSCC so it ties into GS1 logistics standards that GS1 India also promotes.

Jewellery

Gold and silver are metals, but jewellery tags work because the small UHF tag hangs from the piece on a thread rather than sitting flat on a large metal surface. Showrooms count trays and safes with handhelds and use RFID-enabled counters for sales. Small tags have shorter range, so choose a chip with good sensitivity.

Library

Many libraries worldwide use HF ISO 15693 tags with ICODE SLIX2 and the ISO 28560 data model, which gives good self-checkout and security-gate performance. UHF is increasingly chosen for new libraries because it speeds up shelf audits. Pick one and standardise; mixing bands means duplicate reader hardware.

Pharma and brand protection

A serial number alone does not stop counterfeiters - they can copy a readable number onto a fake tag. Real authentication needs a chip that performs a cryptographic challenge-response, such as NTAG 424 DNA (consumers tap with a phone and a server validates the unique message) or UCODE DNA in the supply chain.

Animal identification

Animal ID uses LF at 134.2 kHz under ISO 11784 (code structure) and ISO 11785 (air interface). FDX-B is the dominant protocol for pets and livestock. Glass implants are injected under the skin; ear tags are used for cattle. Readers must support FDX-B, and some also read the older HDX protocol.

Vehicles and FASTag

Vehicle tags must be read at speed through windscreen glass. FASTag, India's electronic toll system, uses passive UHF EPC Gen2 windshield stickers that break if peeled off, preventing transfer between vehicles. Note that metallised or heat-reflective windscreen films can block UHF signals; headlamp-mounted tags are an alternative for such vehicles.

Laundry, tyres and solar panels

These are "hostile environment" applications. Laundry tags face high temperature, pressure from presses and harsh chemicals for hundreds of wash cycles. Tyre tags must survive vulcanisation and years of flexing. Solar module tags must survive lamination heat and then last for the life of the panel. In India, government-supported solar programmes have specified an RFID tag inside the module laminate for traceability - check the current MNRE or scheme specification for exact requirements. In all three cases, the tag supplier's qualification data (wash cycles, temperature profile, pressure) matters more than the chip name.

Questions to ask before choosing

Work through these questions with your supplier or integrator. The answers usually make the chip choice obvious.

1. What is the item made of? Metal, liquids, foil packaging, carbon fibre and dense materials all affect UHF performance.
2. How far is the reader? A few centimetres (tap), up to a metre (desk or gate), or several metres (dock door, ceiling)?
3. How many tags must be read at once, and how fast? Bulk reading of hundreds of items favours UHF.
4. Who reads the tag? Your own fixed or handheld readers, your customers' smartphones, or partner systems such as a retailer or toll operator?
5. Is security required? Is it enough to identify the item, or must you prove it is genuine or control who can write data?
6. How much data must be on the tag? A unique ID linked to a database is usually best. Choose user memory only when data must be available offline.
7. What is the environment and lifetime? Temperature, washing, outdoor UV, chemicals, impact and expected service life.
8. How will tags be applied and encoded? Printed on an RFID printer, pre-encoded by the supplier, or encoded on site?
9. Which region? Tags used in India should be tuned for 865-867 MHz; export items may need global 860-960 MHz tuning.
10. What volume and budget? Indicative costs range from a few rupees for simple UHF inlays in high volume to several hundred rupees or more for rugged on-metal, laundry or sensor tags.

Rules of thumb by band

• Choose UHF when you need range beyond about one metre, bulk reading, or integration with retail and logistics standards. Pay attention to metal and liquids.
• Choose HF/NFC when the read should be deliberate and close, when consumers will use smartphones, or when you need mature, certified security for cards and payments.
• Choose LF for animals, for operation very close to metal or in water, and where existing readers and standards require it.
• Consider dual-frequency tags (UHF plus NFC) when the same item must be read in the warehouse and by consumers.

Common mistakes

• Using a standard UHF label on metal or liquid-filled items. It will detune and fail. Use on-metal tags or tags designed for the material.
• Choosing a chip for its maximum memory "just in case". More memory usually means higher cost and sometimes lower sensitivity. Store data in the database.
• Treating a readable serial number as security. EM4100 cards, MIFARE Classic and plain UHF EPCs can be copied. Use AES-based chips where security matters.
• Ignoring region tuning. A tag optimised for 915 MHz may lose noticeable range at 866 MHz.
• Mixing bands without a plan. An HF library tag cannot be read by UHF gates. Decide the band for the whole system.
• Not locking tags. Leaving EPC memory unlocked with default passwords invites accidental or malicious rewriting.
• Forgetting the encoding workflow. Plan how tags will be printed and encoded - see RFID Printing & Encoding.

If you are still unsure, an independent tag selection and test exercise is one of the most valuable services in an RFID project. Our RFID consulting team can run sample tests on your items and recommend a tag shortlist with measured results.