{"id":6444,"date":"2026-06-16T03:43:43","date_gmt":"2026-06-16T03:43:43","guid":{"rendered":"https:\/\/materialparts.com\/am29f040b-90ef\/"},"modified":"2026-06-16T03:43:43","modified_gmt":"2026-06-16T03:43:43","slug":"am29f040b-90ef","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/am29f040b-90ef\/","title":{"rendered":"AM29F040B-90EF"},"content":{"rendered":"

Productos<\/h2>\n

The AM29F040B-90EF is a 4Mbit (512K x 8) 5V-only Flash memory from AMD (now produced by various second-source manufacturers). With 90ns access time and sector erase architecture (8 x 64KB sectors), it supports in-system programming without external high voltage. The 32-pin PLCC package and JEDEC-standard command set make it a common choice for firmware storage in legacy industrial and embedded systems.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Densidad<\/td>\n4Mbit (512K x 8)<\/td>\n<\/tr>\n
Architecture<\/td>\nSector erase: 8 x 64KByte sectors<\/td>\n<\/tr>\n
Access Time<\/td>\n90ns<\/td>\n<\/tr>\n
Tensi\u00f3n de alimentaci\u00f3n<\/td>\n5V \u00b15% (single supply)<\/td>\n<\/tr>\n
Programming Time<\/td>\n7\u00b5s per byte (typical)<\/td>\n<\/tr>\n
Sector Erase Time<\/td>\n1 second (typical)<\/td>\n<\/tr>\n
Chip Erase Time<\/td>\n8 seconds (typical)<\/td>\n<\/tr>\n
Endurance<\/td>\n100,000 erase\/program cycles<\/td>\n<\/tr>\n
Data Retention<\/td>\n20 years<\/td>\n<\/tr>\n
Interface<\/td>\nParallel (address + data bus)<\/td>\n<\/tr>\n
Paquete<\/td>\n32-pin PLCC<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-40\u00b0C to +85\u00b0C<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • 5V-only single-supply operation \u2014 no external high voltage needed<\/li>\n
  • Sector erase architecture: erase only the sectors needed<\/li>\n
  • Hardware data protection against accidental erasure<\/li>\n
  • JEDEC-standard command set for firmware compatibility<\/li>\n
  • Embedded Erase and Program algorithms \u2014 automatic timing<\/li>\n
  • Data polling and toggle bits for program\/erase status<\/li>\n
  • 100,000 erase\/program cycle endurance<\/li>\n
  • 20-year data retention<\/li>\n
  • Boot block protection option<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Legacy industrial controller firmware storage<\/li>\n
    • Embedded system boot ROM<\/li>\n
    • Networking equipment firmware<\/li>\n
    • Printers and copier firmware<\/li>\n
    • Automotive ECU program storage<\/li>\n
    • Telecom equipment code storage<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The AM29F040B-90EF is a 4Mbit (512K x 8) 5V-only Flash memory from AMD (now produced by various second-source manufacturers). With 90ns access time and sector erase architecture (8 x 64KB sectors), it supports in-system programming without external high voltage. The 32-pin PLCC package and JEDEC-standard command set make it a common choice for […]<\/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":[],"chip_brand":[287],"class_list":["post-6444","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","chip_brand-amd"],"acf":{"brief_explanation":"4Mbit 5V Flash, 512Kx8, 90ns, 8-sector erase, 32-PLCC, JEDEC standard, legacy parallel Flash","date_code":"","package_case":"32-pin PLCC (13.97 x 13.97mm)","in_stock":2150,"datasheet":"https:\/\/www.datasheets.com\/amd\/AM29F040B","price":"$3.50 @ 1ku","product_introduction":"The AM29F040B-90EF is a 4Mbit (512K x 8-bit) 5V-only Flash memory device originally designed by AMD. It features 90ns access time and a sector erase architecture with 8 individually erasable 64KB sectors, allowing selective firmware updates without erasing the entire chip. The device operates from a single 5V supply for both read and write operations, eliminating the need for external high-voltage programming circuitry. The JEDEC-standard command set ensures compatibility with a wide range of programmers and in-system programming tools. The 32-pin PLCC package is through-hole mountable, making it suitable for legacy industrial and embedded designs. This part is now produced by multiple second-source manufacturers.","working_principle":"The AM29F040B uses a NOR-type Flash architecture where each memory cell consists of a floating-gate transistor. Reading is performed by applying 5V and accessing the cell through the address bus \u2014 the stored charge on the floating gate determines the transistor threshold and thus the stored data. Programming (writing a '0') uses the CHE (Channel Hot Electron) mechanism: a high gate voltage and moderate drain voltage inject electrons onto the floating gate. Erasing (writing '1' to all bytes in a sector) uses Fowler-Nordheim tunneling: a high voltage on the source terminal removes electrons from the floating gate. The embedded algorithms automatically generate the required timing and voltage sequences \u2014 the host simply issues command sequences and polls the status bits. The sector architecture allows individual 64KB sectors to be erased without affecting other sectors, enabling field firmware updates of specific code modules.","pin_description":"
      Pin Group<\/th>Count<\/th>Description<\/th><\/tr>
      A0-A18<\/td>19<\/td>Address inputs (512K bytes)<\/td><\/tr>
      DQ0-DQ7<\/td>8<\/td>Data inputs\/outputs<\/td><\/tr>
      CE#<\/td>1<\/td>Chip enable (active low)<\/td><\/tr>
      OE#<\/td>1<\/td>Output enable (active low)<\/td><\/tr>
      WE#<\/td>1<\/td>Write enable (active low)<\/td><\/tr>
      VCC<\/td>1<\/td>+5V power supply<\/td><\/tr>
      VSS<\/td>1<\/td>Ground<\/td><\/tr><\/table>","application_scenarios":"
      • Legacy Industrial Controller:<\/b> The AM29F040B stores firmware in PLCs and CNC controllers designed in the 1990s-2000s. The 5V interface matches the processor bus voltage of legacy designs. In-system programming allows field firmware updates through the JTAG or boot-loader interface without removing the chip from the board.<\/li>
      • Embedded Boot ROM:<\/b> Use as the primary firmware storage device in 5V embedded systems. The sector erase architecture allows the boot loader to reside in a protected sector while application code in other sectors can be updated in the field. The 90ns access time supports zero-wait-state execution on 10MHz processors.<\/li>
      • Networking Equipment:<\/b> Store router\/switch firmware in the 32-pin PLCC socket, enabling easy field replacement. The JEDEC-standard command set is supported by all major in-system programmers, allowing firmware updates through the device's management port.<\/li><\/ul>","alternative_models":"
        Model<\/th>Density<\/th>Speed<\/th>Supply<\/th>Key Difference<\/th><\/tr>
        SST39SF040<\/td>4Mbit<\/td>70ns<\/td>5V<\/td>Microchip, faster, CMOS<\/td><\/tr>
        AT29C040A<\/td>4Mbit<\/td>90ns<\/td>5V<\/td>Microchip, page-write mode<\/td><\/tr>
        MX29F040C<\/td>4Mbit<\/td>70ns<\/td>5V<\/td>Macronix, faster, same footprint<\/td><\/tr>
        S29GL032N<\/td>32Mbit<\/td>90ns<\/td>3V<\/td>Infineon, higher density, 3V<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/6444","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/comments?post=6444"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/6444\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=6444"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=6444"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=6444"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=6444"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}