{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FM25640B-GTR","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"FM25640B-GTR","canonicalUrl":"https://icboms.com/infineon/FM25640B-GTR","factsUrl":"https://icboms.com/api/mcp/products/FM25640B-GTR","rawCanonicalId":null},"summary":{"shortDescription":"Infineon F-RAM™ FM25640B-GTR, 64Kbit FRAM, SPI interface, 20 MHz clock, 4.5V-5.5V supply, 8K x 8 organization, -40°C to 85°C, 8-SOIC package, Tape & Reel.","salesMarkdown":"## 64Kbit FRAM with SPI — what it replaces and why The Infineon FM25640B-GTR is a 64Kbit Ferroelectric RAM (FRAM) from the F-RAM™ series, organized as 8K x 8 bits and accessed through an SPI bus at up to 20 MHz. This makes it a direct drop-in for serial EEPROM sockets where the application needs faster writes, higher endurance, or lower write energy. ## 20 MHz SPI — bus timing and throughput At 20 MHz the SPI interface delivers a raw read throughput of 20 Mbps. The FRAM technology means a write cycle completes in the same 50 ns clock period as a read — no write-polling, no page-buffer management. For a data-logging application that writes 64 bytes every 10 ms, the FM25640B-GTR finishes the write in under 26 µs versus the several milliseconds a 64-byte page write takes in a typical serial EEPROM. That timing difference matters when the MCU needs to service other interrupts during the store operation. ## FRAM endurance — 10^14 cycles versus EEPROM's 10^6 The FM25640B-GTR uses ferroelectric storage with endurance rated at 10^14 read/write cycles, compared to the 10^6 cycles typical of serial EEPROMs. For a system that writes configuration data every power cycle or logs sensor data continuously, that endurance margin eliminates wear-leveling software and the risk of sector failure over a ten-year service life. ## Package and supply — 8-SOIC, 5V rail The supply range is 4.5V to 5.5V, so it runs directly from a 5V rail without a regulator. The SPI bus pins are 5V-tolerant inputs, which means a 3.3V MCU can drive them through a level translator or a simple resistor divider on the output lines. For a 5V-only design, no translation is needed at all.","metaTitle":"Infineon FM25640B-GTR F-RAM, 64Kbit SPI 20MHz, 8-SOIC","metaDescription":"Infineon FM25640B-GTR 64Kbit FRAM, SPI 20MHz, 4.5V-5.5V, -40°C to 85°C, 8-SOIC. Active lifecycle, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":"F-RAM™","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"Mfr":"Infineon Technologies","Series":"F-RAM™","Package":"Tape & Reel (TR) Cut Tape (CT)","Technology":"FRAM (Ferroelectric RAM)","Memory Size":"64Kbit","Memory Type":"Non-Volatile","Memory Format":"FRAM","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Active","Clock Frequency":"20 MHz","lifecycle_stage":"eol_hot","Memory Interface":"SPI","Voltage - Supply":"4.5V ~ 5.5V","Base Product Number":"FM25640","Memory Organization":"8K x 8","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"8-SOIC","Write Cycle Time - Word, Page":"-"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.6300","priceTiers":[{"qty":1,"price":"$4.63000","currency":"USD"},{"qty":10,"price":"$4.19700","currency":"USD"},{"qty":25,"price":"$4.10640","currency":"USD"},{"qty":50,"price":"$4.08400","currency":"USD"},{"qty":100,"price":"$3.66190","currency":"USD"},{"qty":250,"price":"$3.64852","currency":"USD"},{"qty":500,"price":"$3.51520","currency":"USD"},{"qty":1000,"price":"$3.34189","currency":"USD"},{"qty":2500,"price":"$3.30634","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/e1320cd27a800b168bd2ba2bbd5e3dd1.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/FM25640B-GTR/alternatives.json"},"ai":{"faq":[{"question":"Is FM25640B-GTR RoHS compliant and lead-free?","answer":"Yes, the FM25640B-GTR is ROHS3 Compliant, meeting the EU RoHS directive for lead-free and restricted-substance-free manufacturing."},{"question":"Can FM25640B-GTR be used as a drop-in replacement for a 25AA256 EEPROM?","answer":"The FM25640B-GTR is a 64Kbit device, not 256Kbit, so it does not match the 25AA256 density. However, for a 64Kbit serial EEPROM socket, the FM25640B-GTR is a pin-compatible drop-in replacement with the same SPI interface and 8-SOIC footprint, offering faster writes and higher endurance without software changes."},{"question":"When sourcing FM25640B-GTR, what's the closest functional second-source — FM25640B-G?","answer":"The FM25640B-G is the tube-packaged variant of the same die — same 64Kbit FRAM, same SPI interface, same 20 MHz clock, same 8-SOIC footprint. The only difference is the shipping medium: the FM25640B-GTR is Tape & Reel, while the FM25640B-G comes in tubes. For a BOM that specifies Tape & Reel, the FM25640B-G is a functional equivalent but requires a packaging change on the assembly line."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/FM25640B-GTR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/FM25640B-GTR 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}}