ATSHA204-TSU-T

Specialized ICS Overview

The ATSHA204-TSU-T is a CryptoAuthentication™ security IC manufactured by Microchip Technology, housed in a surface-mount SOT-23-3 package. It provides hardware-level authentication using the SHA-256 algorithm with Message Authentication Code (MAC) and Hash-Based Message Authentication Code (HMAC). The device features a 4.5Kb EEPROM for key storage, a guaranteed unique 72-bit serial number, and an internal high-quality Random Number Generator (RNG). It supports both Single-Wire and I²C interfaces, operating within a supply voltage range of 2.0V to 5.5V.

Specialized ICS Feature Summary

• Integrated SHA-256 hash engine supporting MAC and HMAC protocols
• Storage for up to 16 keys with 256-bit key length capability
• Guaranteed unique 72-bit serial number for anti-counterfeiting
• Ultra-low sleep current (<150nA) and wide supply voltage range (2.0V–5.5V)

Specialized ICS Applications

• Anti-clone protection for accessories, daughter cards, and consumables
• Secure boot validation and software anti-piracy
• Network and computer access control

Specialized ICS Procurement Notes

Verify that the specific ordering suffix corresponds to the SOT-23-3 package variant. Confirm the datasheet version, as this component may be marked as not recommended for new designs. Ensure compatibility with existing system firmware before procurement.

Specialized ICS Selection Notes

Select this model when a compact 3-lead surface-mount footprint is required. Verify interface requirements; while it supports I²C, the SOT-23-3 package typically utilizes a Single-Wire Interface configuration. Check if the legacy status impacts long-term supply availability for the product lifecycle.

Specialized ICS Part Context

This part belongs to the ATSHA204 family from Atmel (now Microchip Technology). It serves as a hardware authentication solution designed to secure data and prevent cloning in embedded systems. The TSU suffix specifically denotes the SOT-23-3 package option within the broader series.

Specialized ICS Replacement Considerations

The datasheet indicates this device is not recommended for new designs. Evaluate newer alternatives such as the ATSHA204A series or ATECC series for updated features and long-term support.