ATSHA204A-RBHCZ-HV

Specialized ICS Overview

The ATSHA204A-RBHCZ-HV is a CryptoAuthentication™ security IC from Microchip Technology, designed for hardware-based key storage and symmetric authentication. It integrates a SHA-256 cryptographic engine, a 72-bit unique serial number, and a high-quality random number generator. The device features 4.5 KB of EEPROM for data storage and 512 bits of One-Time Programmable (OTP) memory. It supports I²C and Single Wire Interface (SWI) communication protocols with a supply voltage range of 2.0V to 5.5V. This specific variant is supplied in a 3-lead contact package within a tube format, intended for provisioned secure applications.

Specialized ICS Feature Summary

• Integrated SHA-256 hash algorithm for Message Authentication Code (MAC) and Hash-Based MAC (HMAC) operations
• Stores up to 16 keys with 256-bit length in protected hardware EEPROM
• Includes a guaranteed unique 72-bit serial number and internal Random Number Generator (RNG)
• Supports both 1 MHz I²C interface and high-speed Single Wire Interface (SWI)

Specialized ICS Applications

• Secure download and boot processes for embedded systems
• Ecosystem control and device authentication
• Anti-cloning protection for hardware and firmware
• Message security and integrity verification

Specialized ICS Procurement Notes

Verify the ordering suffix RBHCZ-HV against official Microchip documentation to confirm voltage ranges and package specifications. Ensure compatibility with the host system's I/O voltage levels, as the device supports 1.8V to 5.5V communication voltages. Confirm that the tube packaging aligns with automated assembly requirements. Check for any specific provisioning status indicated by the part number, as this model is described as provisioned.

Specialized ICS Selection Notes

Select the ATSHA204A-RBHCZ-HV when a compact 3-lead contact package is required for space-constrained designs. Choose this variant over SOIC or QFN packages if cost reduction through simplified PCB layout is a priority. Ensure the application utilizes either I²C or SWI interfaces, as these are the only supported communication methods. Verify that the 4.5 KB data zone and 512-bit OTP area meet the specific key storage and configuration needs of the project.

Specialized ICS Part Context

This component belongs to the ATSHA204A series of CryptoAuthentication™ devices. It shares core cryptographic capabilities with other variants in the family but differs in physical packaging and interface options. The RBHCZ-HV designation indicates a specific package type and potentially voltage or provisioning characteristics distinct from standard SOIC or QFN versions. It is designed to provide low-cost, high-security authentication for IoT and consumer electronics.

Specialized ICS Replacement Considerations

Publicly confirmed direct substitute part numbers for the ATSHA204A-RBHCZ-HV are not available in the provided source material. While other ATSHA204A variants exist, they may differ in package or interface. Cross-referencing with alternative security ICs requires careful evaluation of pinout compatibility and software API support.