ATSHA204A-RBHCZ-B

Specialized ICS Overview

The ATSHA204A-RBHCZ-B is a Microchip CryptoAuthentication security IC in a 3-lead Contact surface-mount 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, features a unique 72-bit serial number, an internal RNG, 4.5 KB EEPROM, and 512-bit OTP memory. 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 supporting up to 16 keys with 256-bit length
• Integrated SHA-256 engine for MAC and HMAC operations
• Guaranteed unique 72-bit serial number and high-quality RNG
• Dual interface support: 1 MHz I2C and UART-compatible Single-Wire Interface

Specialized ICS Applications

• Secure download and boot processes
• Ecosystem control and anti-cloning protection
• Message security and session key exchange

Specialized ICS Procurement Notes

Verify the specific suffix RBHCZ-B corresponds to the 3-lead Contact package type as indicated by the product description. Confirm that the ordering quantity aligns with the supplier's tube packaging requirements. Ensure the design accounts for the 28-week production cycle when planning procurement schedules.

Specialized ICS Selection Notes

Select this component for applications requiring low pin count integration via the 3-lead Contact package. It is suitable for systems needing secure boot or anti-counterfeiting where I2C or Single-Wire communication is preferred. Ensure the host MCU supports the required voltage levels for both power and communication interfaces.

Specialized ICS Part Context

This part belongs to the ATSHA204A series within the Microchip CryptoAuthentication™ family. It shares core cryptographic capabilities with other packages like SOT-23 and SOIC but is distinguished by its 3-lead Contact form factor designed for compact surface-mount assembly.

Specialized ICS Replacement Considerations

Publicly documented substitutes include the MOD208 from Modsemi, which offers software and hardware compatibility. Other Microchip devices such as ATECC108A provide different cryptographic algorithms and should be evaluated for protocol differences.