I am working on a RFID reader project and I can't find 125kHz UNIQUE tag specification (like listed in this TWN4 reader spec). I could easily find the datasheets for EM4100, EM4200, EM4102 tags.

One tag I've found uses the term "UNIQUE" but has EM4102 chip inside.


  1. Is the UNIQUE tag a specific RFID standard or is it only a marketing term?

  2. If it is a standard - where can I find the specification of the UNIQUE tag protocol/data format?


"Unique" applies to customer 8 bit ID on chip for 64 bit Read Only memory (EM 4102). These are first two "nibbles" P0,P1 of memory.

  • \$\begingroup\$ what's wrong ? -1, someone is lame without comment \$\endgroup\$ Apr 19 '19 at 23:57

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.