{"id":10394,"date":"2026-07-19T13:07:48","date_gmt":"2026-07-19T13:07:48","guid":{"rendered":"https:\/\/ic-vendor.com\/at25256b-sshl-b\/"},"modified":"2026-07-19T13:07:48","modified_gmt":"2026-07-19T13:07:48","slug":"at25256b-sshl-b","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/zh\/at25256b-sshl-b\/","title":{"rendered":"AT25256B-SSHL-B"},"content":{"rendered":"

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

The Microchip AT25256B-SSHL-B is a 256Kb SPI Serial EEPROM organized as 32K x 8, housed in an 8-pin SOIC (150 mil) package. Operating from 1.8V to 5.5V with a 20MHz maximum clock frequency, it supports SPI modes 0 and 3. The device features block write protection (1\/4, 1\/2, or entire array), hardware write protect and HOLD pins, self-timed write cycles (5ms max), 1 million erase\/write cycle endurance, and 100-year data retention. It is available in both industrial (-40\u00b0C to +85\u00b0C) and automotive grade (-40\u00b0C to +125\u00b0C) versions.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
Density<\/td>\n256 Kbit (32K x 8)<\/td>\n<\/tr>\n
Interface<\/td>\nSPI (modes 0 and 3)<\/td>\n<\/tr>\n
Max Clock Frequency<\/td>\n20 MHz<\/td>\n<\/tr>\n
Operating Voltage<\/td>\n1.8V to 5.5V<\/td>\n<\/tr>\n
Page Size<\/td>\n64 bytes<\/td>\n<\/tr>\n
Write Cycle Time<\/td>\n5 ms max (self-timed)<\/td>\n<\/tr>\n
Endurance<\/td>\n1,000,000 write cycles<\/td>\n<\/tr>\n
Data Retention<\/td>\n100 years<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +85\u00b0C (industrial)<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\n8-SOIC (150 mil, 3.90mm width)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 256Kb SPI serial EEPROM with 32K x 8 organization<\/li>\n
  • Supports SPI modes 0 and 3<\/li>\n
  • Up to 20MHz clock frequency<\/li>\n
  • Block write protection: 1\/4, 1\/2, or entire array<\/li>\n
  • Hardware write protect pin and write disable instructions<\/li>\n
  • HOLD pin for suspending serial communication<\/li>\n
  • Self-timed write cycle (5ms max)<\/li>\n
  • More than 1 million erase\/write cycles<\/li>\n
  • 100-year data retention<\/li>\n
  • Available in industrial and AEC-Q100 automotive grades<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Industrial and commercial systems<\/li>\n
    • Automotive electronics (AEC-Q100 qualified)<\/li>\n
    • Consumer electronics configuration storage<\/li>\n
    • Medical device calibration and data logging<\/li>\n
    • Embedded system parameter retention<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The Microchip AT25256B-SSHL-B is a 256Kb SPI Serial EEPROM organized as 32K x 8, housed in an 8-pin SOIC (150 mil) package. Operating from 1.8V to 5.5V with a 20MHz maximum clock frequency, it supports SPI modes 0 and 3. The device features block write protection (1\/4, 1\/2, or entire array), hardware write […]<\/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],"tags":[1696],"chip_brand":[134],"class_list":["post-10394","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","tag-at25256b-sshl-b","chip_brand-microchip"],"acf":{"brief_explanation":"256Kb SPI Serial EEPROM, 32Kx8, 20MHz, 1.8-5.5V, SOIC-8","date_code":"","package_case":"8-SOIC (4.98 x 3.99 x 1.48 mm)","in_stock":11287,"datasheet":"https:\/\/ww1.microchip.com\/downloads\/en\/DeviceDoc\/AT25128B-AT25256B-128-256-Kbit-SPI-Serial-EEPROM-Industrial-DS20006193C.pdf","price":"$0.90 @ 1ku","product_introduction":"The Microchip AT25256B-SSHL-B is a 256Kb Serial EEPROM utilizing the industry-standard SPI compatible serial bus. Organized as one block of 32,768 x 8 bits, the device is optimized for consumer electronics, industrial, medical, and automotive applications where reliable nonvolatile memory storage is essential. Software write protection allows protecting 1\/4, 1\/2, or the entire memory array, while a hardware write protect pin provides additional security. The HOLD pin enables suspending serial communication without resetting the sequence. Available in industrial and AEC-Q100 qualified automotive grades.","working_principle":"The AT25256B-SSHL-B communicates via the SPI serial bus. 1) SPI Interface Subsystem: CS, SCK, SI, and SO pins implement SPI modes 0 and 3 with clock speeds up to 20MHz. 2) Memory Array Subsystem: The 256Kb EEPROM array is organized as 32K x 8 with 64-byte pages for efficient write operations. 3) Write Protection Subsystem: The status register configures block protection (1\/4, 1\/2, or full array); the WP pin provides hardware protection for the status register. 4) Communication Control Subsystem: The HOLD pin allows the master to suspend an ongoing serial transfer to perform higher-priority tasks, resuming later without data loss.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>CS<\/td>Input<\/td>Chip select (active-low)<\/td><\/tr>
      2<\/td>SO<\/td>Output<\/td>Serial data output (MISO)<\/td><\/tr>
      3<\/td>WP<\/td>Input<\/td>Write protect (active-low protects status register)<\/td><\/tr>
      4<\/td>VSS<\/td>Power<\/td>Ground<\/td><\/tr>
      5<\/td>SI<\/td>Input<\/td>Serial data input (MOSI)<\/td><\/tr>
      6<\/td>SCK<\/td>Input<\/td>Serial clock<\/td><\/tr>
      7<\/td>HOLD<\/td>Input<\/td>Suspend communication (active-low)<\/td><\/tr>
      8<\/td>VCC<\/td>Power<\/td>Supply voltage (1.8-5.5V)<\/td><\/tr><\/table>","application_scenarios":"
      • Industrial Systems: PLC parameter storage and factory automation<\/li>
      • Automotive: AEC-Q100 qualified for in-vehicle electronics<\/li>
      • Consumer: Feature configuration and preference storage<\/li>
      • Medical: Device calibration and patient settings retention<\/li>
      • Embedded: Boot code and serial number storage<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        Microchip<\/td>AT25128B-SSHL-B<\/td>SOIC-8<\/td>128Kb, same family, half density<\/td><\/tr>
        Microchip<\/td>AT25512-NSH-B<\/td>SOIC-8<\/td>512Kb, same family, double density<\/td><\/tr>
        ST<\/td>M95256-WMN6TP<\/td>TSSOP-8<\/td>256Kb SPI EEPROM<\/td><\/tr>
        onsemi<\/td>CAT25256<\/td>SOIC-8<\/td>256Kb SPI EEPROM, compatible<\/td><\/tr>
        ROHM<\/td>BR25H256<\/td>SOIC-8<\/td>256Kb SPI EEPROM<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10394","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/comments?post=10394"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10394\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/media?parent=10394"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/categories?post=10394"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/tags?post=10394"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=10394"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}