The FM4428 offers the same chip capabilities as the Infineon SLE4428 which has now been discontinued. It offers 8KBits EEPROM with write protect functions and programmable security code.

The FM4428 also features irreversible byte-wise write protection. It’s contact configuration is in accordance to ISO standard 7816 (synchronous transmission) and it has a minimum of 100,000 write/erase cycles. Typical applications include customer loyalty cards, health cards, membership cards, school cards, vending cards, identity cards & access control.