ISO7816 CR80 FM5528 Preprinted Contact Smart Cards Pack of 100
- Product Code: RCC20
- Availability: In Stock
- $58.85
-
$58.55
- 5 or more $27.25
- 10 or more $23.34
- 50 or more $19.28
- 100 or more $18.27
FM5528 (also known as Fudan Micro FM5528) is a low-cost,
contact-type logic encryption memory card IC manufactured by Shanghai
Fudan Microelectronics. It is a drop-in replacement and functional clone
of the popular SLE5528 (Infineon) chip. This IC is widely used in legacy
access control, membership cards, and pre-paid phone cards due to its
simple interface and basic security features.
Key Technical Specifications
|
Feature |
Specification |
|
Memory |
1 KB (1024 bytes) of EEPROM |
|
Organization |
1024 × 8 bits (byte-addressable) |
|
Interface |
Contact (ISO/IEC 7816-3) – 5 V operating
voltage |
|
Security |
2-byte Password (PSC) + 8-bit error
counter |
|
Write Endurance |
≥ 100,000 cycles |
|
Data Retention |
≥ 10 years |
|
Compatibility |
Fully compatible with SLE5528 readers and protocols |
Security Model (Logic Encryption)
The FM5528 is not a CPU smart card (no microcontroller).
It uses a simple state machine for data protection:
- Password
Authentication (PSC)
- 2-byte
Password
(16 bits) stored at the end of the memory (addresses 1022–1023).
- Error
Counter
(at address 1021): Initial value = 8. It decrements with each incorrect
password entry.
- Permanent
Lock:
If the counter reaches 0, the card becomes read-only
(write and password functions are permanently disabled). This is a
one-way fuse.
- Byte-Wise
Write Protection
- Each
byte in the main memory (0–1020) can be individually write-protected
(fused).
- Once
a byte is protected, it can never be modified again, even if the
password is known.
Memory Map (Simplified)
|
Address Range |
Content |
|
0–1020 |
User Data Area (readable anytime; writable only
after PSC verification) |
|
1021 |
Error Counter (readable; auto-decrements on wrong
PSC) |
|
1022–1023 |
Password (PSC) (readable only after correct
verification) |
Typical Applications
The FM5528 is a legacy workhorse found in:
- Old-School
Access Control Systems
(office buildings, dormitories)
- Pre-paid
Telephony Cards
(public payphone cards)
- Loyalty
& Membership Cards
(stored-value systems)
- Simple
E-Purses
(low-security vending machines)
- Legacy
Industrial/Device Configuration Cards
Comparison with SLE5528
|
Feature |
FM5528 |
SLE5528 (Original) |
|
Manufacturer |
Shanghai Fudan Microelectronics |
Infineon (formerly Siemens) |
|
Functionality |
Fully Compatible Clone |
Original reference design |
|
Performance |
Similar read/write speed and timing |
Industry standard |
|
Cost |
Typically lower |
Slightly higher (brand premium) |
Security Status (Legacy Warning)
The FM5528 (like SLE5528) is considered legacy-grade security:
- The
2-byte password (65,536 combinations) is vulnerable to brute-force
attacks.
- It
lacks modern cryptography (AES, RSA) and secure key storage.
- Not
recommended for new high-security designs (e.g., payment, government
ID). Use Smart Card ICs with MCU (e.g., SLE78, FM1280) instead.
Why Choose FM5528?
- Cost-Effective: Extremely cheap
for large-volume, low-risk applications.
- Proven
Compatibility:
Works with millions of existing SLE5528 readers worldwide.
- Simple
Integration:
No complex drivers or OS needed; simple serial protocol.
- Basic Protection: Sufficient for discouraging casual data tampering in non-critical systems.