ATECC608B-MAHCZ-S

Specialized ICS Overview

The Microchip ATECC608B-MAHCZ-S is a CryptoAuthentication™ security IC in an 8-UDFN (2x3) package. It provides hardware-based key storage for up to 16 keys and supports ECDSA, ECDH, AES-128, SHA-256, and HMAC. The device features a 1 MHz I2C interface, operates on a 2.0V to 5.5V supply, and includes a high-quality RNG compliant with NIST SP 800-90A/B/C standards. It offers secure boot support, monotonic counters, and a unique 72-bit serial number.

Specialized ICS Feature Summary

• Hardware-accelerated asymmetric cryptography including ECDSA and ECDH using the NIST P256 curve.
• Secure storage for up to 16 keys, certificates, or data within protected EEPROM.
• Supports TLS 1.2/1.3 PRF/HKDF calculations and AES-128 encryption with GCM mode.
• Integrated NIST-compliant random number generator and two high-endurance monotonic counters.

Specialized ICS Applications

• IoT network endpoint key management and session key creation.
• Secure boot validation and protected software download.
• Small message encryption and PII data protection.
• Ecosystem control and anti-cloning authentication.

Specialized ICS Procurement Notes

Verify the specific suffix 'MAHCZ' against official Microchip documentation to confirm the exact temperature range and packaging configuration. Ensure the design accounts for the 8-UDFN exposed pad connection to ground as recommended in the datasheet. Confirm that the I2C interface timing requirements are met by the host system controller.

Specialized ICS Selection Notes

Select this component when hardware-based key protection and ECC acceleration are required. The MAHCZ suffix indicates the UDFN package; verify if the standard (-40°C to +85°C) or extended (-40°C to +100°C) temperature range is needed. Compare against ATECC608C for enhanced security features if backward compatibility is not a constraint.

Specialized ICS Part Context

The ATECC608B belongs to the CryptoAuthentication™ family, offering enhanced security over the ATECC608A while maintaining full backward compatibility. It serves as a secure element for devices requiring robust identity authentication and encrypted communication without exposing private keys to the main processor.

Specialized ICS Replacement Considerations

The ATECC608C is a direct upgrade with improved security features and identical pinout/configuration. For legacy designs using ATECC508A or ATECC608A, migration to the ATECC608B is supported with minimal software changes.