{"id":9667,"date":"2026-07-05T09:06:53","date_gmt":"2026-07-05T09:06:53","guid":{"rendered":"https:\/\/materialparts.com\/atsha204a-stucz-t\/"},"modified":"2026-07-05T09:06:53","modified_gmt":"2026-07-05T09:06:53","slug":"atsha204a-stucz-t","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/atsha204a-stucz-t\/","title":{"rendered":"ATSHA204A-STUCZ-T"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The ATSHA204A-STUCZ-T from Microchip Technology (formerly Atmel) is a cryptographic authentication IC implementing SHA-256 hash-based challenge-response authentication. It contains 4.5Kbit of EEPROM for key storage (16 slots), a 72-bit unique serial number, and an internal high-quality RNG. The STUCZ package variant provides Single-Wire and I2C interfaces in an 8-UDFN (2x3mm) package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Algorithm<\/td>\nSHA-256<\/td>\n<\/tr>\n
EEPROM<\/td>\n4.5 Kbit (16 slots x 36 bytes)<\/td>\n<\/tr>\n
OTP Memory<\/td>\n512 bits<\/td>\n<\/tr>\n
Unique Serial Number<\/td>\n72 bits (guaranteed unique)<\/td>\n<\/tr>\n
Interface<\/td>\nSingle-Wire \/ I2C (1MHz)<\/td>\n<\/tr>\n
\u7535\u6e90\u7535\u538b<\/td>\n2.0V ~ 5.5V<\/td>\n<\/tr>\n
Sleep Current<\/td>\n<150 nA<\/td>\n<\/tr>\n
Operating Current<\/td>\n2 mA (typ)<\/td>\n<\/tr>\n
Data Retention<\/td>\n50 years<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\n8-UDFN (2.0 x 3.0 x 0.50 mm)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40C to +85C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • SHA-256 hardware accelerator for fast cryptographic operations<\/li>\n
  • 4.5Kbit EEPROM organized as 16 individually-lockable key slots<\/li>\n
  • 72-bit guaranteed unique serial number for device identification<\/li>\n
  • Internal high-quality random number generator (RNG)<\/li>\n
  • Full metal shielding over internal circuitry for tamper resistance<\/li>\n
  • Ultra-low 150nA sleep current for always-connected battery applications<\/li>\n
  • Dual interface: I2C (1MHz) and Single-Wire (UART compatible)<\/li>\n
  • Locked configuration and data zones prevent post-deployment key extraction<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • IoT device authentication and anti-counterfeiting<\/li>\n
    • Secure boot verification for embedded processors<\/li>\n
    • Consumable and cartridge authentication<\/li>\n
    • Battery pack authentication<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The ATSHA204A-STUCZ-T from Microchip Technology (formerly Atmel) is a cryptographic authentication IC implementing SHA-256 hash-based challenge-response authentication. It contains 4.5Kbit of EEPROM for key storage (16 slots), a 72-bit unique serial number, and an internal high-quality RNG. The STUCZ package variant provides Single-Wire and I2C interfaces in an 8-UDFN (2x3mm) package. Key Specifications […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[944],"chip_brand":[134],"class_list":["post-9667","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","tag-atsha204a-stucz-t","chip_brand-microchip"],"acf":{"brief_explanation":"SHA-256 crypto auth IC, I2C\/SWI, 4.5Kb EEPROM, 8-UDFN, 2-5.5V, 150nA sleep","date_code":"","package_case":"8-UDFN (2.0 x 3.0 x 0.50 mm)","in_stock":3156,"datasheet":"https:\/\/www.microchip.com\/en-us\/product\/ATSHA204A","price":"$0.55 @ 5ku","product_introduction":"The Microchip ATSHA204A-STUCZ-T is a cryptographic authentication device that implements SHA-256 challenge-response authentication for secure IoT device identity validation. The device contains a hardware SHA-256 accelerator, 4.5Kbit of EEPROM organized as 16 slots (each 36 bytes for 256-bit keys plus metadata), 512 bits of one-time-programmable (OTP) memory, a 72-bit guaranteed-unique serial number, and a high-quality internal RNG. The STUCZ package code indicates the 8-UDFN (2x3mm) variant with both Single-Wire and I2C interface options. Security features include full metal shielding over the die, internal clock and voltage generation, encrypted memory access, and tamper detection circuitry. The device supports diversified keys, rolled keys, created keys, single-use keys, and password checking, providing flexible authentication topologies for various security requirements.","working_principle":"The ATSHA204A implements challenge-response authentication using the SHA-256 hash algorithm. The host sends a challenge (random number) to the ATSHA204A, which concatenates it with a secret key stored in one of its 16 EEPROM slots and computes the SHA-256 hash. The host performs the same computation using its copy of the key and compares results. Since SHA-256 is a one-way function, the secret key never leaves the device, making the authentication resistant to eavesdropping. The device also supports MAC (Message Authentication Code), HMAC (Hash-based MAC), and GenDig (Generate Digest) commands for more complex authentication protocols. The internal RNG generates high-entropy nonces for challenge generation. During manufacturing personalization, configuration and data zones are sequentially programmed and locked, after which keys cannot be read or modified, providing a root of trust anchored in hardware.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>NC<\/td>-<\/td>No connect<\/td><\/tr>
      2<\/td>NC<\/td>-<\/td>No connect<\/td><\/tr>
      3<\/td>SDA \/ SIO<\/td>I\/O<\/td>I2C data \/ Single-wire interface<\/td><\/tr>
      4<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      5<\/td>SCL<\/td>Input<\/td>I2C clock (tie to VCC for SWI mode)<\/td><\/tr>
      6<\/td>VCC<\/td>Power<\/td>Supply voltage (2.0-5.5V)<\/td><\/tr>
      7<\/td>NC<\/td>-<\/td>No connect<\/td><\/tr>
      8<\/td>NC<\/td>-<\/td>No connect<\/td><\/tr><\/table>","application_scenarios":"
      • IoT device authentication and anti-counterfeiting for edge nodes<\/li>
      • Secure boot verification for embedded Linux and RTOS processors<\/li>
      • Consumable and cartridge authentication for printers and medical devices<\/li>
      • Battery pack authentication to prevent unsafe third-party replacements<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        Microchip<\/td>ATECC508A<\/td>8-UDFN<\/td>ECC P-256 crypto, more advanced<\/td><\/tr>
        Microchip<\/td>ATECC608A<\/td>8-UDFN<\/td>Latest ECC crypto, most capable<\/td><\/tr>
        Infineon<\/td>OPTIGA Trust M<\/td>USON-6<\/td>ECC crypto, similar application<\/td><\/tr>
        NXP<\/td>SE050<\/td>UFDFN-16<\/td>ECC\/ RSA crypto, more interfaces<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9667","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=9667"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/9667\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=9667"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=9667"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=9667"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=9667"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}