MiFare Classic (13.56MHz RFID/NFC) Sticker
This is a blank MiFare Classic sticker - often used for inventory, identification but also found in other systems where a flexible, thin tag is desired. The tag contains a NXP S50 chip and an antenna, and is passively powered by the reader/writer when placed a couple inches away.
These can be read by almost any 13.56MHz RFID/NFC reader but make sure it can handle MiFare cards as there are a few other encoding standards (like FeLica) They are tested and work great with both of Adafruit's PN532 RFID reader shield/ break-outs.
These chips can be written to & store up to 1 KB of data in writable EEPROM divided into banks, and can handle over 100,000 re-writes. You can use Adafruit's NFC/RIFD shield to read and write data to the EEPROM inside the tag. There is also a permanent 4-byte ID burned into the chip that you can use to identify one tag from another - the ID number cannot be changed.
S50 chip specification:
- 1 KiloByte (8 KiloBit) non-volatile EEPROM storage
- Built in encryption engine with 48-bit key
- 4 Byte unique identifier burned into the chip
- 13.56 MHz frequency
- 41mm x 24mm x 0.2mm
- 0.3 grams / 0.01 oz
- Works about 2.5" away from reader