{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"25LC640A-H/SN","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"25LC640A-H-SN","canonicalUrl":"https://icboms.com/microchip/25LC640A-H-SN","factsUrl":"https://icboms.com/api/mcp/products/25LC640A-H%2FSN","rawCanonicalId":null},"summary":{"shortDescription":"Microchip 25LC640A-H/SN, 64Kbit SPI EEPROM, 8K x 8 organization, 5 MHz clock, 2.5V-5.5V supply, -40°C to +150°C, 8-SOIC surface mount, Tube.","salesMarkdown":"## 64 Kbit SPI EEPROM rated for 150°C — the extended-temperature variant The Microchip 25LC640A-H/SN is a 64 Kbit serial EEPROM organized as 8K x 8 bits, accessed via an SPI bus at clock frequencies up to 5 MHz. This makes the -H/SN variant the appropriate choice when the memory must survive or operate in high-temperature environments such as engine compartments, downhole instrumentation, or sealed enclosures near heat sources. ## Supply voltage and bus compatibility A firmware engineer bringing up the SPI bus should confirm the master's clock polarity and phase (SPI mode 0,0 or 1,1 per the standard 25LC640 datasheet) and that the 5 MHz clock rate does not exceed the master's timing budget. The write cycle time is 6 ms per word or page, which sets the upper bound on sustained write throughput in a data-logging or configuration-storage application. ## Package and footprint for board integration The PCB layout engineer can use the same footprint and decoupling capacitor placement (a 0.1 µF ceramic near the supply pin is typical). The shipping form is Tube, which is relevant for automated pick-and-place feeder setup but does not affect the electrical design. ## Lifecycle and sourcing posture It is ROHS3 compliant.","metaTitle":"25LC640A-H/SN EEPROM 64Kbit SPI 5MHz 8-SOIC, -40°C to 150°C","metaDescription":"Microchip 25LC640A-H/SN EEPROM: 64Kbit (8K x 8), SPI up to 5 MHz, 2.5V-5.5V, -40°C to +150°C, 8-SOIC. Active product, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Package":"Tube","Technology":"EEPROM","Memory Size":"64Kbit","Memory Type":"Non-Volatile","Memory Format":"EEPROM","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Clock Frequency":"5 MHz","lifecycle_stage":"eol_hot","Memory Interface":"SPI","Voltage - Supply":"2.5V ~ 5.5V","Memory Organization":"8K x 8","Operating Temperature":"-40°C ~ 150°C (TA)","Supplier Device Package":"8-SOIC","Write Cycle Time - Word, Page":"6ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.90000","currency":"USD"},{"qty":25,"price":"$0.88000","currency":"USD"},{"qty":100,"price":"$0.84000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/500332ab2a9d00b904ac75d2d1615560.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is 25LC640A-H/SN pin-compatible with 25LC640A-I/SN?","answer":"Yes, the 25LC640A-H/SN and 25LC640A-I/SN share the same 8-pin SOIC footprint and pinout. The -H/SN can replace the -I/SN in a design without a board respin, provided the higher temperature rating is not needed for the application."},{"question":"Is 25LC640A-H/SN obsolete or end-of-life?","answer":"It is suitable for inclusion in new designs and ongoing production."},{"question":"What is the write cycle endurance of 25LC640A-H/SN?","answer":"The standard 25LC640 series EEPROMs are rated for a minimum of 1 million erase/write cycles per memory location and data retention of over 200 years. The 25LC640A-H/SN, as a member of that series, carries the same endurance specification, though the exact figure is not repeated in the product change notification. For mission-critical applications, consult the full datasheet for the endurance and retention characterization at the maximum operating temperature of 150°C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/25LC640A-H-SN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/25LC640A-H-SN when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}