The T5577 is a highly versatile low-frequency (LF) RFID chip developed by Atmel (now part of Microchip), widely used in access control, hotel key cards, and industrial systems. Here are its main technical characteristics:
- Operating frequency: 125 kHz (also configurable for 134 kHz)
- Memory: 363 bits EEPROM, organized in 11 blocks of 32 bits + 1 lock bit
- Read/Write: Fully rewritable, supports multiple access modes (direct, request, password)
- UID: 8-byte unique identifier (configurable)
- Compatibility: Supports Atmel T5557, ATA5567 protocols; can replace T5551 in many modes
- Modulation: ASK, FSK, PSK (configurable)
- Data retention: 10 years minimum
- Write endurance: Up to 100,000 cycles
- Card format: CR80 (85.5 × 54 × 0.80 mm), typically in PVC or PET
- Operating temperature: –25°C to +65°C
- Applications: Access control, animal ID, waste management, hotel locks, membership cards
Its flexibility in configuration and strong compatibility make it a favorite for systems that need adaptable RFID solutions.