ATSHA204A-XHCZ-T

Specialized ICS Overview

The Microchip ATSHA204A-XHCZ-T is a CryptoAuthentication™ security IC housed in an 8-lead TSSOP package. It provides hardware-based key storage and symmetric authentication using the SHA-256 algorithm. The device supports up to 16 keys with 256-bit lengths, features a guaranteed unique 72-bit serial number, and includes an internal high-quality random number generator (RNG). Memory consists of 4.5 kb EEPROM for keys/data and 512 bits of One-Time Programmable (OTP) storage. Communication interfaces include a 1 MHz I²C bus and a UART-compatible single-wire interface. Operating parameters specify a supply voltage range of 2.0V to 5.5V, communication voltage from 1.8V to 5.5V, and sleep current below 150 nA.

Specialized ICS Feature Summary

• Hardware-protected key storage supporting up to 16 keys with 256-bit length
• Integrated SHA-256 hash engine with MAC and HMAC capabilities
• Guaranteed unique 72-bit serial number and internal RNG
• Dual interface options: 1 MHz I²C and UART-compatible Single-Wire Interface

Specialized ICS Applications

• Secure download and boot validation
• Ecosystem control and anti-cloning protection
• Message security and session key exchange
• Consumable client authentication (e.g., printer ink tanks)

Specialized ICS Procurement Notes

Verify that the ordering suffix -XHCZ-T corresponds to the 8-TSSOP package configuration. Confirm the specific tape and reel quantity requirements with the supplier. Ensure the component grade matches the application environment specifications before procurement.

Specialized ICS Selection Notes

Select this model when an 8-pin surface-mount footprint is required for system integration. Choose the I²C interface for standard multi-device buses or the Single-Wire Interface to minimize GPIO usage on the host microcontroller. Verify that the 2.0V to 5.5V supply range aligns with the target system power architecture.

Specialized ICS Part Context

This component belongs to the Microchip CryptoAuthentication™ family, designed for high-security hardware authentication. It serves as a dedicated crypto element to offload cryptographic operations from the main processor, ensuring secret keys remain isolated within the hardware boundary against physical and logical attacks.

Specialized ICS Replacement Considerations

Public documentation confirms compatibility with the ATSHA204A series. Specific cross-model substitutes are not verified in the provided source material.