FM4428 FMSH ISO 7816 Security IC Contact Module
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- ISO 7816 compliant
- 2-byte password security engine
- 8K bits user memory
- Contact Module package
FM4428 is the memory card chip developed by Shanghai FM Co, Ltd.. FM4428 has 1K × 8Bit EEPROM with write protect function and programmable security code, its contact configuration is in accordance to ISO standard 7816 (Synchronous Transmission), FM4428 can be widely used in different types of IC memory cards.
Key Specifications
| Memory Capacity | 8K bits |
| Supported Standard | ISO 7816 |
| Security Algorithm | 2-byte password |
| Package | Contact Module |
| Typical Application | Contact health insurance card, Membership card |
Features
- 1024×8 bit EEPROM organizatio
- Byte-wise addressing
- Irreversible byte-wise write protectio
- 1024×1 bit protection memory organizatio
- Serial three wire bus
- End of programming indicated on data output
- Minimum of 100,000 write/erase cycles
- Data retention for at least 10 years
Applications
Contact health insurance card, Membership card.
Design Notes
- Contactless parts need a tuned antenna. Read range and current draw both depend on the coil geometry and the Q of the matching network, so treat the datasheet distance figure as a reference design value, not a guarantee.
- Where the part supports both contact and contactless operation, the two interfaces share the same die and power domain. Plan the supply so a contact transaction does not brown out the RF field.
- Check the card-side standard before selecting: ISO 14443 A and B differ at the air interface, and a reader built for one will not talk to cards of the other.
- EEPROM endurance and retention are specified per the datasheet. If the application rewrites counters frequently, budget the write cycles against card lifetime.
Common Questions
What standard does this chip support?
ISO 7816. Matching the card-side standard is the first selection step — a reader built for one variant will not interoperate with cards of the other.
How is it connected to a host controller?
Through the host interface listed in the specifications above. The bus runs at pad voltage, so level shifting is not needed when the MCU shares the same rail.
Does it include the security algorithm in hardware?
Yes — the algorithm engine is on-die, which is why the key never leaves the chip.
What package is it available in?
Contact Module. The datasheet mechanical drawing gives the land pattern and the clearance needed around the antenna pins.
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