RFID RC522 Module Specifications

General

• Module Type: RFID Reader/Writer
• IC: MFRC522
• Frequency: 13.56 MHz (HF)
• Communication: SPI, I²C, UART (depends on breakout)
• RFID Tag Support: ISO/IEC 14443 Type A

Electrical

• Operating Voltage: 3.3 V DC (max 3.6V)
• Operating Current: ~13–26 mA
• Logic Level: 3.3 V
• Power Supply Pins: VCC, GND

Interface / Pins

• SDA / SS – Chip Select
• SCK – Serial Clock
• MOSI – Master Out Slave In
• MISO – Master In Slave Out
• IRQ – Interrupt (optional)
• RST – Reset
• VCC – Power (3.3V)
• GND – Ground

Performance

• Reading Distance: Typically 2–5 cm (depends on antenna size)
• Communication Speed: SPI up to 10 MHz
• Supported Tags: MIFARE Classic 1K / 4K, NTAG203, other ISO14443A cards
• Antenna: Built-in PCB antenna

Physical

• Module Size: ~40 mm × 60 mm (depends on breakout board)
• Weight: ~10 g

Applications

• Access control systems
• Attendance systems
• Contactless payment systems
• Arduino / Raspberry Pi RFID projects