{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"X28HC256FI-90","brand":"Renesas Electronics","brandSlug":"renesas","productSlug":"X28HC256FI-90","canonicalUrl":"https://icboms.com/renesas/X28HC256FI-90","factsUrl":"https://icboms.com/api/mcp/products/X28HC256FI-90","rawCanonicalId":null},"summary":{"shortDescription":"Unisem X28HC256FI-90, 256Kbit parallel EEPROM (32K x 8), 90 ns access time, 4.5 V supply, 5 ms write cycle, surface-mount 28-pin flat package, -40°C to 85°C.","salesMarkdown":"## Parallel EEPROM for 5 V legacy buses The Unisem X28HC256FI-90 is a 256 Kbit parallel EEPROM organized as 32K x 8, with a 90 ns access time and a 4.5 V nominal supply. It uses a standard parallel interface for direct connection to 8-bit microcontroller and DSP memory buses, and comes in a surface-mount 28-pin flat package. Typical applications include industrial controllers, embedded systems, and legacy telecom equipment that require non-volatile parameter storage with byte-level rewritability. ## Industrial temperature range — environment fit","metaTitle":"Unisem X28HC256FI-90 256Kbit Parallel EEPROM, 90 ns","metaDescription":"Unisem X28HC256FI-90 256Kbit (32K x 8) parallel EEPROM, 90 ns access time, 4.5 V supply, -40°C to 85°C, surface-mount 28-pin flat package. EOL-hot; sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"title":"X28HC256FI-90","frame_size":"256Kbit","Access Time":"90 ns","description":"IC EEPROM 256KBIT PAR 28CFLATPK","memory_type":"Non-Volatile","package_type":"Bulk","Memory Format":"EEPROM","mounting_type":"Surface Mount","interface_type":"Parallel","lifecycle_stage":"eol_hot","supply_voltage_v":"4.5","Memory Organization":"32K x 8","Operating Temperature High":"-40°C to 85°C(TA)","Write Cycle Time - Word, Page":"5ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$123.31","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/3f1bee5e75ea7fa51d1f3fcfa60f293b.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/X28HC256FI-90/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for X28HC256FI-90?","answer":"Pricing and availability for the X28HC256FI-90 are confirmed at quote time against an RFQ through independent distribution. Submit an RFQ to receive current pricing and stock status."},{"question":"When sourcing X28HC256FI-90, what is the closest functional alternative — X28C513EMB-25?","answer":"The X28C513EMB-25 is a 512 Kbit parallel EEPROM with 150 ns access time and a -55°C to 125°C range. It is a higher-density, wider-temperature alternative but runs slower and has a different pinout — verify footprint compatibility before substitution."},{"question":"What is the memory organization of X28HC256FI-90?","answer":"The X28HC256FI-90 is organized as 32K x 8 bits (256 Kbit total), with a parallel interface and a 90 ns access time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/renesas/X28HC256FI-90","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/renesas/X28HC256FI-90 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}}