{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"93LC66A-E/SN","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"93LC66A-E-SN","canonicalUrl":"https://icboms.com/microchip/93LC66A-E-SN","factsUrl":"https://icboms.com/api/mcp/products/93LC66A-E%2FSN","rawCanonicalId":null},"summary":{"shortDescription":"Microchip 93LC66A-E/SN, 4Kbit Serial EEPROM, Microwire interface, 2 MHz clock, 2.5V-5.5V supply, 512 x 8 organization, 6ms write cycle, -40°C to 125°C, 8-SOIC package, Tube.","salesMarkdown":"## 4 Kbit of non-volatile storage on a three-wire bus The Microchip 93LC66A-E/SN is a 4 Kbit serial EEPROM using the Microwire interface — a simple three-wire serial bus (clock, data in, data out) plus a chip-select line. Organized as 512 x 8 bits, it stores calibration constants, configuration tables, or small firmware patches that need to survive power loss. The 2 MHz clock rate keeps read/write cycles snappy for infrequent updates, and the 6 ms write cycle time per word or page is typical for this density class. That matters when you are stuffing a BOM that spans an old 5 V microcontroller and a new 3.3 V sensor hub — one EEPROM line item covers both domains. The wide range also gives headroom for a regulated 3.3 V rail that droops under load. ## Temperature grade — industrial-plus, not just commercial That means it is specced for outdoor telecom cabinets that bake in summer sun, engine-bay electronics, and factory-floor PLCs that see thermal cycling. If your design lives in a climate-controlled office, a commercial-grade 93LC46 variant would work, but for anything that leaves the building this temperature grade is the right call. ## Package and handling — 8-SOIC, tube delivery For high-volume pick-and-place, you would typically order the tape-and-reel variant (93LC66A-E/SNT or similar), but the tube version is handy when you are pulling a few units for a repair or a small run. ## Lifecycle — active, no end-of-life shadow No NRND flag, no last-time-buy notice. For a mature serial EEPROM family like the 93LCxx series, that is the expected status — these parts have long tails in industrial and automotive service.","metaTitle":"Microchip 93LC66A-E/SN 4Kbit Microwire EEPROM, 2 MHz, 8-SOIC","metaDescription":"Microchip 93LC66A-E/SN 4Kbit EEPROM, Microwire interface, 2 MHz clock, 2.5V-5.5V supply, -40°C to 125°C, 8-SOIC. Active lifecycle, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Interface & Transceivers"],"specifications":{"Package":"Tube","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":"Microwire","Voltage - Supply":"2.5V ~ 5.5V","Memory Organization":"512 x 8","Operating Temperature":"-40°C ~ 125°C (TA)","Supplier Device Package":"8-SOIC","Write Cycle Time - Word, Page":"6ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.43","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.43000","currency":"USD"},{"qty":25,"price":"$0.42400","currency":"USD"},{"qty":100,"price":"$0.42000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/166b1e973ae972dafd128a2ddead82b6.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is 93LC66A-E/SN compatible with 5V systems?","answer":"The Microwire interface signals are 5 V tolerant at the high end of the range."},{"question":"What is the equivalent of 93LC66A-E/SN?","answer":"A close functional equivalent is the 93AA66B-I/MS, which is a 4 Kbit Microwire EEPROM in an 8-MSOP package. The key difference is the supply voltage: the 93AA66B runs from 1.8 V minimum, while the 93LC66A-E/SN needs at least 2.5 V. If your board is 1.8 V capable and the temperature requirement is commercial, the 93AA66B is a drop-in alternative; otherwise, stick with the 93LC66A-E/SN for industrial environments."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/93LC66A-E-SN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/93LC66A-E-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}}