{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"AT28HC256F-90JU-T","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"AT28HC256F-90JU-T","canonicalUrl":"https://icboms.com/microchip/AT28HC256F-90JU-T","factsUrl":"https://icboms.com/api/mcp/products/AT28HC256F-90JU-T","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology AT28HC256F-90JU-T, 256Kbit parallel EEPROM, 90 ns access time, 4.5-5.5V supply, 32-PLCC (13.97x11.43 mm), -40°C to +85°C, Tape & Reel / Cut Tape.","salesMarkdown":"## 32-PLCC footprint and board integration The AT28HC256F-90JU-T comes in a 32-lead PLCC (J-Lead) package, supplier device package 32-PLCC measuring 13.97x11.43 mm. The J-lead footprint allows socketed or soldered mounting on surface-mount boards, with the leads tucked under the body to save real estate compared to a SOIC of the same pin count. ## 90 ns access — what it means for read timing With a 90 ns access time, the AT28HC256F-90JU-T delivers data to the bus within 90 ns of the address being valid. This is fast enough to interface with most 8-bit microcontrollers and CPLDs running at clock rates up to roughly 10 MHz without inserting wait states, depending on the controller's memory-cycle timing. The memory is organized as 32K x 8 bits (256 Kbit total), addressed via a 15-bit parallel address bus, with chip-enable and output-enable controls for bus sharing. ## Industrial temperature grade and write endurance The write cycle time is 10 ms per word or page — typical for parallel EEPROMs of this density — and the device supports byte and page write modes for firmware parameter storage.","metaTitle":"AT28HC256F-90JU-T EEPROM, 256Kbit, 90ns, 32-PLCC","metaDescription":"Microchip AT28HC256F-90JU-T 256Kbit parallel EEPROM, 90ns access, 4.5-5.5V, -40°C to 85°C, 32-PLCC. Active production, ROHS3. Sourced per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Technology":"EEPROM","Access Time":"90 ns","Memory Size":"256Kbit","Memory Type":"Non-Volatile","Memory Format":"EEPROM","Mounting Type":"Surface Mount","Package / Case":"32-LCC (J-Lead)","lifecycle_stage":"eol_hot","Memory Interface":"Parallel","Voltage - Supply":"4.5V ~ 5.5V","Memory Organization":"32K x 8","Operating Temperature":"-40°C ~ 85°C (TC)","Supplier Device Package":"32-PLCC (13.97x11.43)","Write Cycle Time - Word, Page":"10ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$14.78","priceTiers":[{"qty":1,"price":"$14.78000","currency":"USD"},{"qty":25,"price":"$14.64000","currency":"USD"},{"qty":750,"price":"$14.64000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/c543aae533f8ba193794d7a53f7d5ebd.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/AT28HC256F-90JU-T/alternatives.json"},"ai":{"faq":[{"question":"How can I order AT28HC256F-90JU-T or check availability?","answer":"The AT28HC256F-90JU-T is an active Microchip part available through independent distribution."},{"question":"Will AT28HC256F-90JU-T drop into a board designed for 24AA128T-I/SN?","answer":"No — the 24AA128T-I/SN is a 128 Kbit I²C serial EEPROM in an 8-pin SOIC package with a 900 ns access time. The AT28HC256F-90JU-T is a 256 Kbit parallel EEPROM in a 32-pin PLCC. The interface, pinout, package, and supply voltage (1.7 V vs 4.5-5.5 V) are all different; a board respin is required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/AT28HC256F-90JU-T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/AT28HC256F-90JU-T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}