{"title":"Adafruit ST25DV16K I2C RFID EEPROM Breakout - STEMMA QT / Qwiic","handle":"adafruit-st25dv16k-i2c-rfid-eeprom-breakout-stemma-qt-qwiic","url":"/products/adafruit-st25dv16k-i2c-rfid-eeprom-breakout-stemma-qt-qwiic","description":"The Adafruit ST25DV16K is a unique I2C-programmable RFID EEPROM breakout that works with mobile phones as an ISO/IEC 15693 (13.56 MHz) NFC tag, but can be dynamically rewritten over I2C by a microcontroller. This makes it ideal for projects where you need to change tag content on the fly — for example, cycling through different URLs that a phone detects in sequence.\n\nThe breakout includes the ST25DV16K chip, support circuitry, and a PCB trace antenna. STEMMA QT / Qwiic connectors allow solderless I2C connections, and standard 0.1\" headers are included for breadboard use.\n\nKey Features\n\n\nST25DV16K Chip – 16 Kbit I2C EEPROM with ISO/IEC 15693 RFID interface\n\nI2C Programmable – Dynamically rewrite NFC tag content from a microcontroller\n\nPhone Compatible – Readable by Apple and Android devices as an NFC tag\n\nPCB Trace Antenna – Built-in antenna, no external antenna needed\n\nSTEMMA QT / Qwiic – Solderless I2C connectors on both sides\n\nBidirectional Data Transfer – Can be used as an I2C-to-RFID bridge for wireless data exchange with mobile devices\n\n\nIdeal For\n\nDynamic NFC tags that change content programmatically\nInteractive displays and exhibits\nWireless data transfer between microcontrollers and phones\nIoT projects requiring phone-readable tags\n\n\nPackage Contents\n\n1× ST25DV16K breakout board with PCB antenna\n1× Header strip\n\n\n\nImportant: The ST25DV library requires a SAMD-based board (e.g. Metro M0) or better — Arduino UNO (ATmega328p) does not have enough RAM. PN532-based RFID readers do not support ISO 15693 and cannot read this tag. Arduino library only — no CircuitPython support at this time.\n\n\nResources\n\nST25DV Arduino Library\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":3916,"title":"Default Title","sku":"AF-4701","price":8.14,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":3,"option1":"Default Title"}]}