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Adafruit ST25DV16K I2C RFID EEPROM Breakout

Adafruit ST25DV16K I2C RFID EEPROM Breakout

Pimoroni

£3.25

Price read from Pimoroni on 2026-10-22. Check before buying.

This RFID tag is really unique: it works with mobile phones just like other RFID tags, but you can reprogram it over I2C. The tag shows up as an ISO/IEC 15693 (13.56MHz) chip which is readable by phones and tablets. This could be interesting in situations where you want a tag that can be re-written dynamically when connected to a controller. For example, Adafruit did a test where they had a microcontroller write different URLs a few seconds apart, and the mobile phone detected the different URLs one after the other. Note that the most popular hobby RFID reader/writer chips like the PN532 do no

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The part other shops don't tell you. Three separate questions, kept separate on purpose, each with its source.