ATSHA204-MAH-CZ-T

Specialized ICS Overview

The ATSHA204-MAH-CZ-T is a CryptoAuthentication™ security IC designed for hardware-based authentication and data validation. It integrates a SHA-256 cryptographic engine with Message Authentication Code (MAC) capabilities, supporting both Host and Client operations. The device features a 4.5Kb EEPROM array divided into 16 slots for secure key storage, alongside 512 bits of One-Time Programmable (OTP) memory. It operates within a 2.0V to 5.5V supply range and supports high-speed I²C (up to 1MHz) and Single-Wire interfaces. Key specifications include a guaranteed unique 72-bit serial number, an internal high-quality Random Number Generator (RNG), and ultra-low sleep current consumption below 150nA.

Specialized ICS Feature Summary

• Integrated SHA-256 hash algorithm with MAC and HMAC support for robust challenge-response authentication.
• 4.5Kb EEPROM organized into 16 configurable slots for secret keys, calibration data, and consumption tracking.
• Guaranteed unique 72-bit serial number and internal high-quality Random Number Generator (RNG) to prevent replay attacks.
• Dual interface options: 1MHz I²C and High-Speed Single-Wire Interface for flexible system integration.

Specialized ICS Applications

• Anti-counterfeiting and validation of consumables, daughter cards, and spare parts.
• Secure boot validation and firmware protection against unauthorized modification.
• Session key exchange for encrypted downloads and confidential communications.
• Network and computer access control systems.

Specialized ICS Procurement Notes

Verify the specific ordering suffix to confirm package type and tape/reel configuration. The 'MAH' designation typically corresponds to the 8-pad UDFN package. Confirm that the component is sourced from authorized distributors to ensure authenticity, as counterfeit security ICs pose significant risks to system integrity. Check for RoHS compliance documentation if required by local regulations.

Specialized ICS Selection Notes

Select this component when hardware-level authentication is required without the complexity of full public-key infrastructure. It is suitable for applications needing secure key storage and simple symmetric authentication protocols. Ensure the host microcontroller supports either I²C or Single-Wire communication. Consider the ATSHA204A variant if extended hardware security features or updated manufacturing processes are preferred, as the original ATSHA204 may be marked as not recommended for new designs.

Specialized ICS Part Context

The ATSHA204 belongs to the Microchip CryptoAuthentication™ family, originally developed by Atmel. It serves as a turnkey solution for securing embedded systems against cloning and data tampering. The device is often used in conjunction with microcontrollers to offload cryptographic operations, ensuring that private keys never leave the secure boundary of the IC. It complements other security devices like the ATECC series which offer elliptic curve cryptography.

Specialized ICS Replacement Considerations

The ATSHA204A is the direct successor with enhanced security features. For pin-compatible replacements, verify the package footprint (8-UDFN). Other Microchip CryptoAuthentication devices such as the ATECC508A or ATECC608A offer different cryptographic capabilities (ECC vs SHA-256) but may require software adaptation.