{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"25AA128T-I/SN","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"25AA128T-I-SN","canonicalUrl":"https://icboms.com/microchip/25AA128T-I-SN","factsUrl":"https://icboms.com/api/mcp/products/25AA128T-I%2FSN","rawCanonicalId":null},"summary":{"shortDescription":"Microchip 25AA128T-I/SN, 128Kbit SPI EEPROM, 10 MHz clock, 1.8V-5.5V supply, 16K x 8 organization, SOIC-8, -40°C to 85°C.","salesMarkdown":"## 128 Kbit SPI EEPROM for config storage and parameter logging The Microchip 25AA128T-I/SN is a 128 Kbit serial EEPROM organized as 16K x 8 bits, accessed over an SPI bus at clock frequencies up to 10 MHz. It stores firmware parameters, calibration tables, and event logs in designs where non-volatile memory must survive power loss and retain data for years. Peer parts in the 25LC family (25LC080, 25LC256) specify a 2.5 V minimum, which locks them to 3.3 V or higher rails. The 25AA128T-I/SN runs directly off a 1.8 V core supply in low-power designs, or off a 5 V bus in industrial PLC I/O cards, without a separate regulator or voltage translation on the memory rail. That saves a component and a PCB trace. ## Write cycle timing and endurance for field-update planning Page and word writes complete in 5 ms maximum. For a 128 Kbit device that means a full-chip rewrite (128 pages) takes about 640 ms, assuming no polling delays. That timing matters when sizing the firmware update window or the data-logging interval: you need to hold the SPI lines stable and the supply within range for the full write cycle, or the page may be corrupted. The evidence does not cite a specific endurance cycle count, but the 5 ms write time is consistent with standard EEPROM page-write behavior.","metaTitle":"Microchip 25AA128T-I/SN 128Kbit SPI EEPROM, 10 MHz","metaDescription":"Microchip 25AA128T-I/SN 128Kbit SPI EEPROM, 10 MHz clock, 1.8V-5.5V supply, -40°C to 85°C, SOIC-8. Active production, ROHS3.","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":"128Kbit","Memory Type":"Non-Volatile","Memory Format":"EEPROM","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Clock Frequency":"10 MHz","lifecycle_stage":"eol_hot","Memory Interface":"SPI","Voltage - Supply":"1.8V ~ 5.5V","Memory Organization":"16K x 8","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"8-SOIC","Write Cycle Time - Word, Page":"5ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.12","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.12000","currency":"USD"},{"qty":25,"price":"$1.08000","currency":"USD"},{"qty":100,"price":"$1.05000","currency":"USD"},{"qty":3300,"price":"$1.05000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/dd55a98a3e12f4284ba3f028921931c2.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does 25AA128T-I/SN require external pull-up resistors?","answer":"The SPI bus signals (SCK, SI, SO, CS) require pull-up resistors on the host MCU side per standard SPI practice — the EEPROM itself does not include internal pull-ups. The evidence does not specify a recommended value, but 4.7 kΩ to 10 kΩ to VCC is typical for 10 MHz SPI."},{"question":"Can I use 25AA128T-I/SN with 5V?","answer":"The device operates at 10 MHz across the full supply range, so no speed derating is needed at 5 V."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/25AA128T-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/25AA128T-I-SN when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}