{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"93AA66AT-I/SN","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"93AA66AT-I-SN","canonicalUrl":"https://icboms.com/microchip/93AA66AT-I-SN","factsUrl":"https://icboms.com/api/mcp/products/93AA66AT-I%2FSN","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 93AA66AT-I/SN EEPROM, 4Kbit (512 x 8), Microwire interface, 2 MHz clock, 1.8V to 5.5V supply, -40°C to +85°C, 8-SOIC, Tape & Reel.","salesMarkdown":"## 4 Kbit Microwire at 2 MHz — the interface that decides the fit The 93AA66AT-I/SN: The Microwire interface is a three-wire serial protocol (SI, SO, SK) with a dedicated chip-select — it is not I²C or SPI, so the MCU or ASIC on the other end must have a Microwire port or bit-bang the timing. The 2 MHz clock rate is fast enough for most parameter-storage and calibration-ID reads; the 6 ms write cycle (word or page) sets the floor for in-application updates. The supply range covers 1.8 V low-voltage cores up to 5 V legacy logic without a separate regulator. At 1.8 V the internal charge pump still generates the write voltage, so the part operates across the full range without a performance derating — the 2 MHz clock holds at any supply voltage within the window. ## ROHS3 compliance — no exemption risk The part is ROHS3 compliant, meaning no restricted substances above the threshold limits and no time-limited exemptions that could trigger a supply discontinuity.","metaTitle":"Microchip 93AA66AT-I/SN EEPROM, 4Kbit Microwire, 2 MHz","metaDescription":"Microchip 93AA66AT-I/SN 4Kbit EEPROM, Microwire interface, 2 MHz clock, 1.8-5.5V, SOIC-8. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"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":"Microwire","Voltage - Supply":"1.8V ~ 5.5V","Memory Organization":"512 x 8","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"8-SOIC","Write Cycle Time - Word, Page":"6ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.35","priceTiers":[{"qty":1,"price":"$0.35000","currency":"USD"},{"qty":25,"price":"$0.34480","currency":"USD"},{"qty":3300,"price":"$0.34500","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/166b1e973ae972dafd128a2ddead82b6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/93AA66AT-I%2FSN/alternatives.json"},"ai":{"faq":[{"question":"Will 93AA66AT-I/SN drop in as a replacement for 24AA128T-I/SN?","answer":"No — the 24AA128T-I/SN is a 128 Kbit I²C EEPROM in the same SOIC-8 footprint, but the interface protocol is different. The 93AA66AT-I/SN uses Microwire, not I²C. The pinout is also different: Microwire uses dedicated SI/SO/SK pins, while I²C uses SDA/SCL. A board designed for the 24AA128T-I/SN would require a firmware and possibly a layout change to accept the 93AA66AT-I/SN."},{"question":"What is the write cycle time for the 93AA66AT-I/SN?","answer":"The write cycle time — word or page — is 6 ms typical. This is the time the internal charge pump and programming logic take to write the data to the memory array. The part does not accept new commands during this window; the host must poll the READY/BUSY status or wait the full 6 ms before the next operation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/93AA66AT-I-SN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/93AA66AT-I-SN 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}}