{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY27H256-35ZC","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY27H256-35ZC","canonicalUrl":"https://icboms.com/infineon/CY27H256-35ZC","factsUrl":"https://icboms.com/api/mcp/products/CY27H256-35ZC","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies CY27H256-35ZC, 256Kbit (32K x 8) EPROM, 35 ns access time, parallel interface, 4.5 V supply, 0°C to 70°C, surface-mount 28-TSOP, bulk.","salesMarkdown":"## Active EPROM for firmware storage The CY27H256-35ZC is an Infineon 256Kbit EPROM organized as 32K x 8, with a 35 ns access time and a parallel interface. The 35 ns access time means the memory can deliver data within 35 ns of the address being stable — fast enough for most 8-bit microcontroller and DSP buses running at clock rates up to about 28 MHz without wait states. The parallel interface simplifies glue logic; the EPROM's non-volatile nature holds firmware through power cycles. ## Lifecycle and supply posture For BOM planning, this EPROM is a single-source component — there is no official pin-compatible second source from Infineon or another manufacturer. The closest functional alternative in the non-volatile parallel 256Kbit space is the FM28V020-SG (FRAM, 140 ns access, 2.0 V supply, -40°C to 85°C), but its slower access time and different supply voltage mean a board redesign is required. Housed in a 28-TSOP surface-mount package, the CY27H256-35ZC is supplied in bulk (tube) quantity. The 0.50 mm pitch TSOP footprint is standard for 256Kbit EPROMs of this generation; verify the pinout against your PCB layout — the 28-pin TSOP pin 1 orientation is marked by a notch on the package body. The commercial temperature range (0°C to 70°C) limits deployment to indoor, temperature-controlled environments.","metaTitle":"Infineon CY27H256-35ZC 256Kbit EPROM, 35 ns, Parallel","metaDescription":"Infineon CY27H256-35ZC 256Kbit (32K x 8) EPROM, 35 ns access, parallel interface, 4.5 V supply, 0°C to 70°C. Active lifecycle. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"has_mpn":"CY27H256","frame_size":"256Kbit","Access Time":"35 ns","memory_type":"Non-Volatile","package_type":"Bulk","Memory Format":"EPROM","mounting_type":"Surface Mount","interface_type":"Parallel","product_status":"Active","lifecycle_stage":"eol_hot","supply_voltage_v":"4.5","Memory Organization":"32K x 8","Operating Temperature High":"0°C to 70°C (TA)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.39","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d1268d1dae044b14a2937202476260fa.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CY27H256-35ZC/alternatives.json"},"ai":{"faq":[{"question":"What is the access time of CY27H256-35ZC?","answer":"The CY27H256-35ZC has a 35 ns access time, meaning data is available 35 ns after the address is stable."},{"question":"What package type is CY27H256-35ZC?","answer":"It comes in a 28-TSOP surface-mount package, supplied in bulk (tube) quantity."},{"question":"Can CY27H256-35ZC be replaced by FM28V020-SG?","answer":"The FM28V020-SG is a 256Kbit FRAM with a parallel interface, but its 140 ns access time is significantly slower, and its 2.0 V supply differs from the CY27H256-35ZC's 4.5 V. A board redesign is required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY27H256-35ZC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY27H256-35ZC 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}}