{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"25LC040T/SN","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"25LC040T-SN","canonicalUrl":"https://icboms.com/microchip/25LC040T-SN","factsUrl":"https://icboms.com/api/mcp/products/25LC040T%2FSN","rawCanonicalId":null},"summary":{"shortDescription":"Microchip 25LC040T/SN, 4Kbit SPI EEPROM, 2 MHz clock, 512 x 8 organization, 2.5V–5.5V supply, 8-SOIC surface mount, 0°C to 70°C operating temperature.","salesMarkdown":"## 4Kbit SPI EEPROM for parameter storage The Microchip 25LC040T/SN is a 4Kbit serial EEPROM with an SPI interface, organized as 512 x 8 bytes. It runs at a 2 MHz clock rate and operates from 2.5V to 5.5V, making it a drop-in fit for both 3.3V and 5V microcontroller designs. The 5ms write cycle time is typical for this density class — firmware needs to poll the write-in-progress bit or insert a delay after each page write. ## Active lifecycle, ROHS3 compliant The 8-SOIC package is widely stocked across distribution, and the Tape & Reel suffix (T/SN) indicates reeled delivery for automated assembly.","metaTitle":"Microchip 25LC040T/SN 4Kbit SPI EEPROM, 2 MHz, 8-SOIC","metaDescription":"Microchip 25LC040T/SN 4Kbit SPI EEPROM, 2 MHz clock, 2.5V–5.5V supply, 8-SOIC. ROHS3 compliant, active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Technology":"EEPROM","Memory Size":"4Kbit","Memory Type":"Non-Volatile","Memory Format":"EEPROM","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Clock Frequency":"2 MHz","lifecycle_stage":"eol_hot","Memory Interface":"SPI","Voltage - Supply":"2.5V ~ 5.5V","Memory Organization":"512 x 8","Operating Temperature":"0°C ~ 70°C (TA)","Supplier Device Package":"8-SOIC","Write Cycle Time - Word, Page":"5ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.68","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.68000","currency":"USD"},{"qty":25,"price":"$0.65000","currency":"USD"},{"qty":100,"price":"$0.62000","currency":"USD"},{"qty":3300,"price":"$0.62000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/3308cff76fa888c1f3cd83e17d644a98.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is 25LC040T/SN RoHS compliant?","answer":"Yes, the 25LC040T/SN is ROHS3 compliant per the manufacturer's listing."},{"question":"What is the difference between 25LC040T/SN and 25LC040T-I/SN?","answer":"All other specs — 4Kbit density, 2 MHz SPI, 2.5V–5.5V supply, 8-SOIC package — are identical."},{"question":"How fast is the SPI bus on 25LC040T/SN?","answer":"The SPI clock frequency is 2 MHz maximum. This is adequate for reading/writing calibration data or configuration tables but not for streaming large blocks."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/25LC040T-SN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/25LC040T-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}}