The Adafruit ATECC608 Breakout provides hardware-based cryptographic security for your microcontroller projects. This crypto-authentication chip from Microchip stores private keys securely — once locked, the keys cannot be read back, only used for challenge-response authentication. Even if someone gains access to your hardware and reads the firmware, the secret keys remain protected.

The ATECC608 communicates over I2C and supports ECDH key agreement, AES-128 encrypt/decrypt/signing, SHA-256/HMAC hash functions, and hardware random number generation. STEMMA QT connectors provide solderless I2C connection, and the board works with 3.3V or 5V logic.

Key Features

• Secure Key Storage – Private keys locked in hardware, cannot be read back
• ECDH Key Agreement – Elliptic curve Diffie-Hellman for secure key exchange
• AES-128 Support – Hardware encrypt/decrypt/signing
• SHA-256/HMAC – Hardware-accelerated hash functions
• Random Number Generator – Hardware RNG for cryptographic operations
• I2C Interface – Fixed address 0x60
• STEMMA QT / Qwiic Connectors – Solderless I2C connection
• Wide Voltage Range – 3.3V or 5V power and logic

Ideal For

• IoT device authentication and security
• Secure boot and firmware verification
• Encrypted communication
• Hardware key management

Package Contents

• 1× Adafruit ATECC608 Breakout Board with STEMMA QT