The SLE4442 is a widely used smart card IC known for its simplicity and security features. Here are its key technical characteristics:

🧠 Memory & Structure

• 256 bytes of EEPROM for user data
• 32 bytes of security memory
• 3-byte programmable security code (PSC) for write protection
• Write endurance: 100,000 cycles
• Data retention: 10 years

🔐 Security Features

• PIN-based access control: Write operations require correct PSC
• Error counter: 3 attempts before card locks write access
• Anti-tearing mechanism: Protects data during power loss

📡 Communication & Interface

• Contact interface: ISO/IEC 7816 compliant
• Protocol: Asynchronous, T=0
• Supply voltage: 5V ±10%
• Clock frequency: Up to 5 MHz
• Operating temperature: –25 °C to +85 °C

🧩 Applications

Used in loyalty cards, prepaid cards, access control, and ID systems where moderate security and low cost are key.