RFID Tag IC Frequency Selection: 125 kHz vs 13.56 MHz vs UHF
Range, data, cost, and reader ecosystem — pick the band by application
The RFID band sets range, robustness, data, and reader ecosystem. 125 kHz LF is short-range and tolerant of metal/liquid; 13.56 MHz HF can be read by smartphones (NFC); UHF reaches far and suits bulk inventory. Below are JLink-distributed EM Microelectronic tag ICs by band.
① 125 kHz Low Frequency (LF) — short range, robust
Common for access control, animal ID, and industrial ID. Read-only parts are cheap; read/write parts update data in the field.
Top read-only pick, compatible with the EM4100/TK4100 ecosystem.
Read/write; often a functional alternative to the T5577.
Read/write with password protection — access and logistics.
② 13.56 MHz High Frequency (HF) — NFC, phone-readable
Readable by a tap from a smartphone — fits anti-counterfeiting, ticketing, and higher-security needs.
ISO 15693 with a hardware crypto engine and a 96-bit key.
③ UHF (860–960 MHz) — long range, bulk inventory
Long range, bulk reads — mainstream in retail and supply chain; BAP parts can add sensing.
Passive EPC Gen2 — retail and logistics tags.
Battery-assisted (BAP) + temperature sensing — cold-chain telemetry.
④ Dual-frequency (NFC + UHF) — one chip, two ecosystems
Supports both phone NFC reads and UHF long-range inventory — fits brand protection and omnichannel traceability.
NFC (ISO 14443A) + UHF (EPC Gen2) dual-frequency.
Dual-frequency plus a sensor interface (e.g. temperature).
Cross-references
Related guides
Frequently asked questions
What is the difference between 125 kHz and UHF? ▾
125 kHz LF is short range (a few cm), tolerant of metal/liquid, and suits access control and animal ID; UHF (860–960 MHz) reaches meters and supports bulk reads for retail and supply chain. Data capacity and cost structure differ too.
What replaces the TK4100 / EM4100? ▾
The EM4200 is a protocol-compatible drop-in for the EM4100/4102 — existing 125 kHz readers decode it the same way, with higher density and longer range. See the cross-reference page.
Which part can a smartphone read? ▾
Choose 13.56 MHz HF (NFC): the EM4233 (ISO 15693); or the dual-frequency EM4425/EM4423 for both phone NFC and UHF long-range inventory.
Not sure which part fits?
Tell us your application and constraints — our engineers will recommend a part and quote stock, pricing, and lead time.
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