ATSHA204A-SSHCZ-T

Specialized ICS Overview

The ATSHA204A-SSHCZ-T is a Microchip Technology authentication chip in the CryptoAuthentication family, housed in an 8-SOIC package. It provides hardware-based key storage and symmetric authentication using the SHA-256 algorithm with MAC/HMAC options. The device supports up to 16 keys of 256-bit length, features a unique 72-bit serial number, and includes an internal RNG. Memory consists of 4.5 kb EEPROM and 512-bit OTP. It operates on a 2.0V to 5.5V supply with <150 nA sleep current and interfaces via I2C (up to 1 MHz) or Single-Wire Interface.

Specialized ICS Feature Summary

• Hardware-based key storage with SHA-256, MAC, and HMAC support
• Stores up to 16 keys with 256-bit length and guaranteed unique 72-bit serial number
• Includes 4.5 kb EEPROM and 512-bit One Time Programmable (OTP) memory
• Supports I2C (1 MHz) and UART-compatible Single-Wire Interface

Specialized ICS Applications

• Secure download and boot processes
• Ecosystem control for peripheral validation
• Anti-cloning protection for hardware components
• Message security and data integrity verification

Specialized ICS Procurement Notes

Verify the ordering suffix 'SSHDA' or 'SSHCZ' against the specific datasheet revision to confirm package type and interface configuration. Ensure the I2C address settings match the system design requirements before finalizing procurement. Confirm that the 8-SOIC package dimensions align with the PCB footprint specifications.

Specialized ICS Selection Notes

Select this component when hardware-level authentication is required without complex asymmetric cryptography. It is suitable for applications needing secure key storage and challenge-response protocols. Consider the I2C interface speed and voltage levels (1.8V to 5.5V) for compatibility with the host microcontroller. Evaluate the need for Single-Wire Interface if GPIO pin count is limited.

Specialized ICS Part Context

This part belongs to the ATSHA204A series within the Microchip CryptoAuthentication family. It serves as a dedicated security element for embedded systems, providing a cost-effective solution for device authentication. The 8-SOIC variant offers a standard surface-mount package suitable for automated assembly in consumer electronics and industrial control applications.

Specialized ICS Replacement Considerations

Check for direct replacements within the ATSHA204A series with different package suffixes (e.g., TSSOP, UDFN). Verify functional equivalence regarding memory size and cryptographic capabilities. Ensure any substitute maintains the same I2C/SWI interface compatibility and voltage operating range.