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ISO14443-B Tag IC with 2 binary counters, full EEPROM user memory and anti-collision with 512-bit

The SRT512 is a contactless memory, powered by an externally transmitted radio wave. It contains a 512-bit user EEPROM. The memory is organized as 16 blocks of 32 bits. The SRT512 is accessed via the 13.56 MHz carrier. Incoming data are demodulated and decoded from the received amplitude shift keying (ASK) modulation signal and outgoing data are generated by load variation using bit phase shift keying (BPSK) coding of a 847 kHz subcarrier. The received ASK wave is 10% modulated. The data transfer rate between the SRT512 and the reader is 106 Kbit/s in both reception and emission modes.

The SRT512 follows the ISO 14443-2 Type B recommendation for the radio-frequency power and signal interface.

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Key Features

  • ISO 14443-2 Type B air interface compliant
  • ISO 14443-3 Type B frame format compliant
  • 13.56 MHz carrier frequency
  • 847 kHz subcarrier frequency
  • 106 Kbit/second data transfer
  • 8 bit Chip_ID based anticollision system
  • 2 count-down binary counters with automated anti-tearing protection
  • 64-bit unique identifier
  • 512-bit EEPROM with write protect feature
  • Read_block and Write_block (32 bits)
  • Internal tuning capacitor
  • 1 million erase/write cycles
  • 40-year data retention
  • Self-timed programming cycle
  • 5 ms typical programming time

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS5143: 13.56 MHz short-range contactless memory chip with 512-bit EEPROM and anticollision functions
8.0 724 KB

Application Notes

Description Version Size
AN2319: Using the 64-bit UID in contactless RFID applications
2.1 65 KB
AN2866: How to design a 13.56 MHz customized tag antenna
1.2 289 KB

Technical Notes & Articles

Description Version Size
TA0347: Key features and benefits of STMicroelectronics short-range contactless memory ICs
2.0 100 KB
TA259: Designing low-cost large-volume close-coupling contactless systems with ST contactless memories and coupler
2.1 61 KB

Publications and Collaterals


Description Version Size
RFID and RF memory products - Based on ISO 14443 and ISO 15693
1.0 225 KB

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