TECHNICAL GUIDE
ATSHA204A‑STUCZ‑T SOT‑23 Hardware Crypto Authentication IC
Use the article below together with the latest manufacturer documentation and your application requirements.
The ATSHA204A‑STUCZ‑T is a compact hardware cryptographic authentication integrated circuit built for cost‑sensitive and space‑constrained embedded security scenarios. Housed in industry‑standard 3‑pin SOT‑23 surface‑mount package, this crypto element minimizes PCB footprint, requiring only minimal peripheral components and few host controller GPIO resources, which simplifies hardware layout for mass‑produced consumer electronics, portable devices and accessory modules.
Powered by integrated SHA‑256 hardware cryptographic engine, the component supports MAC and HMAC authentication operations to deliver hardware‑accelerated symmetric authentication. It features 256‑bit key length and up to 16 configurable key slots, with all critical key material stored inside hardware‑shielded EEPROM memory. This hardware‑based protection effectively mitigates common security risks such as key extraction, software cracking and data tampering that occur within pure‑software encryption architectures.
Each unit comes pre‑programmed with a non‑alterable 72‑bit unique serial number, offering immutable hardware identity for device validation. A built‑in true random number generator generates high‑entropy random values for authentication challenges, strengthening resistance against replay and decryption attacks. On‑chip 4.5Kb EEPROM and 512‑bit OTP memory enable secure storage of calibration parameters, configuration data and fixed security credentials for long‑term data retention.
This device adopts single‑wire communication interface, greatly reducing host pin requirements and facilitating integration with most mainstream microcontrollers. It accepts supply voltage ranging from 2.0V to 5.5V, while communication voltage supports 1.8V‑5.5V, compatible with multi‑voltage embedded designs. Ultra‑low sleep current below 150nA significantly cuts power consumption, making it well‑suited for battery‑powered low‑energy equipment to extend operating lifespan.
With robust hardware anti‑tamper mechanisms, cryptographic calculations run inside isolated circuits independent of main MCU, avoiding system‑wide security exposure. It maintains stable performance across‑40°C to +85°C industrial temperature range and complies with RoHS lead‑free requirements for global electronic manufacturing standards.
Widely deployed for accessory anti‑cloning, consumable validation, hardware IP protection, secure boot verification and encrypted session key exchange, the ATSHA204A‑STUCZ‑T serves as a budget‑friendly hardware trust anchor for IoT hardware, smart peripherals and various cost‑focused embedded security implementations
Powered by integrated SHA‑256 hardware cryptographic engine, the component supports MAC and HMAC authentication operations to deliver hardware‑accelerated symmetric authentication. It features 256‑bit key length and up to 16 configurable key slots, with all critical key material stored inside hardware‑shielded EEPROM memory. This hardware‑based protection effectively mitigates common security risks such as key extraction, software cracking and data tampering that occur within pure‑software encryption architectures.
Each unit comes pre‑programmed with a non‑alterable 72‑bit unique serial number, offering immutable hardware identity for device validation. A built‑in true random number generator generates high‑entropy random values for authentication challenges, strengthening resistance against replay and decryption attacks. On‑chip 4.5Kb EEPROM and 512‑bit OTP memory enable secure storage of calibration parameters, configuration data and fixed security credentials for long‑term data retention.
This device adopts single‑wire communication interface, greatly reducing host pin requirements and facilitating integration with most mainstream microcontrollers. It accepts supply voltage ranging from 2.0V to 5.5V, while communication voltage supports 1.8V‑5.5V, compatible with multi‑voltage embedded designs. Ultra‑low sleep current below 150nA significantly cuts power consumption, making it well‑suited for battery‑powered low‑energy equipment to extend operating lifespan.
With robust hardware anti‑tamper mechanisms, cryptographic calculations run inside isolated circuits independent of main MCU, avoiding system‑wide security exposure. It maintains stable performance across‑40°C to +85°C industrial temperature range and complies with RoHS lead‑free requirements for global electronic manufacturing standards.
Widely deployed for accessory anti‑cloning, consumable validation, hardware IP protection, secure boot verification and encrypted session key exchange, the ATSHA204A‑STUCZ‑T serves as a budget‑friendly hardware trust anchor for IoT hardware, smart peripherals and various cost‑focused embedded security implementations
