ATECC508A-SSHCZ-B

Specialized ICS Overview

The ATECC508A-SSHCZ-B is a cryptographic co-processor and authentication chip from the CryptoAuthentication™ family, manufactured by Microchip Technology. It provides secure hardware-based key storage and performs high-speed public key algorithms including ECDSA and ECDH using NIST P256 curves. The device features a 1 MHz I2C interface, supports SHA-256 with HMAC, and includes an internal FIPS random number generator. It offers 10 Kb EEPROM for up to 16 keys and operates on a 2.0V to 5.5V supply voltage with less than 150 nA sleep current. The component is housed in an 8-pad SOIC package.

Specialized ICS Feature Summary

• Hardware-accelerated ECDSA and ECDH operations supporting NIST P256 elliptic curves
• Secure storage for up to 16 keys within 10 Kb EEPROM memory
• Integrated SHA-256 hash engine with HMAC capability
• Guaranteed unique 72-bit serial number and internal FIPS RNG

Specialized ICS Applications

• IoT node security and identity authentication
• Secure download and boot validation
• Anti-cloning protection for consumables or accessories
• Message integrity verification in network communications

Specialized ICS Procurement Notes

Verify that the specific suffix SSHCZ-B corresponds to the 8-lead SOIC package variant as indicated by the product description. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the design accounts for the specified operating temperature range of -40°C to +85°C and the required pull-up resistors for the I2C interface.

Specialized ICS Selection Notes

Select this component when hardware-based key storage and asymmetric cryptography are required without relying on software implementations. It serves as a direct replacement for ATSHA204A devices if configured appropriately. Consider the 1 MHz I2C speed and low sleep current for power-sensitive applications. Verify compatibility with existing host microcontrollers regarding voltage levels and bus protocols.

Specialized ICS Part Context

This part belongs to the Microchip CryptoAuthentication™ series, designed specifically for security applications requiring robust key management. It complements other devices like the ATECC108A and ATSHA204A within the same ecosystem. The ATECC508A focuses on providing essential ECC capabilities and secure storage in a compact form factor suitable for various embedded systems.

Specialized ICS Replacement Considerations

The ATECC508A is fully compatible with the ATSHA204A and ATSHA204 devices if properly configured. It can also replace the ATECC108A in many scenarios, offering additional features such as ECDH commands and monotonic counters. Ensure personalization procedures are updated when migrating from legacy parts.