{"id":10395,"date":"2026-07-19T13:07:48","date_gmt":"2026-07-19T13:07:48","guid":{"rendered":"https:\/\/ic-vendor.com\/at25256b-sshl-b-2\/"},"modified":"2026-07-19T13:07:48","modified_gmt":"2026-07-19T13:07:48","slug":"at25256b-sshl-b-2","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/zh\/at25256b-sshl-b-2\/","title":{"rendered":"AT25256B-SSHL-B"},"content":{"rendered":"

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

The AT25256B-SSHL-B is a 256Kbit SPI Serial EEPROM from Microchip, organized as 32K x 8 bits with 20MHz SPI clock capability. This is the 8-SOIC tube-packaged variant operating from 1.8V to 5.5V with industrial temperature range.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Memory Density<\/td>\n256Kbit (32KB)<\/td>\n<\/tr>\n
Organization<\/td>\n32K x 8<\/td>\n<\/tr>\n
Interface<\/td>\nSPI (modes 0 and 3)<\/td>\n<\/tr>\n
Max Clock Frequency<\/td>\n20MHz<\/td>\n<\/tr>\n
\u7535\u6e90\u7535\u538b<\/td>\n1.8V to 5.5V<\/td>\n<\/tr>\n
Page Size<\/td>\n64 bytes<\/td>\n<\/tr>\n
Write Cycle Time<\/td>\n5ms max<\/td>\n<\/tr>\n
Endurance<\/td>\n1,000,000 cycles<\/td>\n<\/tr>\n
Data Retention<\/td>\n100 years<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\n8-SOIC (3.9mm wide)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +85\u00b0C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • 20MHz SPI \u2014 2x faster than standard SPI EEPROMs<\/li>\n
  • Wide voltage range: 1.8V to 5.5V<\/li>\n
  • Block write protection (1\/4, 1\/2, or entire array)<\/li>\n
  • Hardware and software write protection<\/li>\n
  • 64-byte page write with self-timed cycle<\/li>\n
  • 100-year data retention<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Automotive electronics<\/li>\n
    • Motor drive and control<\/li>\n
    • Industrial systems<\/li>\n
    • Consumer electronics<\/li>\n
    • Smart metering<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The AT25256B-SSHL-B is a 256Kbit SPI Serial EEPROM from Microchip, organized as 32K x 8 bits with 20MHz SPI clock capability. This is the 8-SOIC tube-packaged variant operating from 1.8V to 5.5V with industrial temperature range. Key Specifications Memory Density 256Kbit (32KB) Organization 32K x 8 Interface SPI (modes 0 and 3) Max […]<\/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":[40,4],"tags":[1696,1651,1661],"chip_brand":[134],"class_list":["post-10395","post","type-post","status-publish","format-standard","hentry","category-electrically-erasable-programmable-read-only-memory-eeprom","category-memory-chips","tag-at25256b-sshl-b","tag-eeprom","tag-spi","chip_brand-microchip"],"acf":{"brief_explanation":"256Kbit SPI EEPROM, 20MHz, 1.8-5.5V, 64B page, 8-SOIC Tube, -40~85\u00b0C","date_code":"","package_case":"8-SOIC (0.154\", 3.90mm width)","in_stock":9500,"datasheet":"https:\/\/www.microchip.com\/en-us\/product\/at25256b","price":"","product_introduction":"The AT25256B-SSHL-B is a 256Kbit SPI Serial EEPROM from Microchip with 20MHz clock capability and wide 1.8V-5.5V operating range. Supporting SPI modes 0 and 3, it provides fast read throughput. The 64-byte page write buffer, block write protection (1\/4, 1\/2, or entire array), and dual hardware\/software write protection ensure data integrity. The -B suffix denotes tube packaging in 8-pin SOIC, suitable for manual assembly or low-volume production. With 1 million cycle endurance and 100-year data retention, it delivers exceptional reliability.","working_principle":"The AT25256B communicates via standard SPI with CS, SCK, SI, and SO signals supporting modes 0 and 3. Write operations require WREN command, then Page Program with 16-bit address and up to 64 data bytes. Internal high-voltage generation handles erase\/write within 5ms. Block write protection is configured via Status Register BP1\/BP0 bits, and the WP pin provides hardware protection. Read operations output data sequentially from the addressed location.","pin_description":"
      Pin<\/th>Name<\/th>Function<\/th><\/tr>
      1<\/td>CS<\/td>Chip Select (active low)<\/td><\/tr>
      2<\/td>SO<\/td>Serial Data Output<\/td><\/tr>
      3<\/td>WP<\/td>Write Protect (active low)<\/td><\/tr>
      4<\/td>VSS<\/td>Ground<\/td><\/tr>
      5<\/td>SI<\/td>Serial Data Input<\/td><\/tr>
      6<\/td>SCK<\/td>Serial Clock<\/td><\/tr>
      7<\/td>HOLD<\/td>Suspend\/Resume (active low)<\/td><\/tr>
      8<\/td>VCC<\/td>Power Supply<\/td><\/tr><\/table>","application_scenarios":"
      • Automotive ECU and body controller configuration<\/li>
      • Motor drive and VFD parameter storage<\/li>
      • Industrial PLC and SCADA system settings<\/li>
      • Smart meter and energy monitoring data<\/li>
      • Consumer electronics firmware configuration<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Density<\/th>Notes<\/th><\/tr>
        Microchip<\/td>AT25256B-SSHL-T<\/td>256Kbit<\/td>Same, tape-and-reel<\/td><\/tr>
        Microchip<\/td>25LC256-I\/SN<\/td>256Kbit<\/td>10MHz, 2.5V min<\/td><\/tr>
        STMicro<\/td>M95256-DRMN6TP<\/td>256Kbit<\/td>SPI EEPROM, 20MHz<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10395","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=10395"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10395\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/media?parent=10395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/categories?post=10395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/tags?post=10395"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=10395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}