The main features of the SLE4428 are:
- Synchronous communication protocol, ISO 7816 compatible
- EEPROM size is 1,024 bytes split into the following areas:

25 bytes for card manufacturer data
2 bytes for card issuer reference
4 bytes for card identification data
990 bytes for main user data
3 bytes for error counter and card secret code area
- Access to the memory is protected by a 3 byte secret code for data write only
- Free Read of Data (except PIN)
- Answer to reset according to ISO 7816/3 standard
- Data retention is up to 10 years
- Non reversible byte-wise write protection of lowest 32 addresses (byte 0 ?31)
- 20 degree + 50 degree operating range