{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"24CW640T-I/ST","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"24CW640T-I-ST","canonicalUrl":"https://icboms.com/microchip/24CW640T-I-ST","factsUrl":"https://icboms.com/api/mcp/products/24CW640T-I%2FST","rawCanonicalId":null},"summary":{"shortDescription":"Microchip 24CW series, 64Kbit I²C EEPROM, 1 MHz clock, 450 ns access time, 1.6V to 5.5V supply, 8K x 8 organization, 8-TSSOP package, industrial temperature -40°C to 85°C.","salesMarkdown":"## 64 Kbit I²C EEPROM for low-voltage buses The Microchip 24CW640T-I/ST is a 64 Kbit serial EEPROM with an I²C interface, clocked at 1 MHz and organized as 8K x 8 bits. Its supply voltage range of 1.6V to 5.5V covers the 1.8V, 2.5V, 3.3V, and 5V logic rails you find on mixed-voltage boards — no separate level translator needed for the memory bus. The 450 ns access time is fast enough for most MCU reads without wait states, and the 5 ms write cycle (word or page) is the standard for this density class. Surface-mount only, so plan for a standard SMD pick-and-place. Microchip lists the 24CW640T-I/ST as an active product. ## What the 1.6V minimum supply means for your design The 1.6V floor is the key differentiator versus older 24Cxx parts that need 2.5V or 4.5V minimum. If your MCU runs on a 1.8V rail (common in battery-powered IoT or low-power sensor nodes), this EEPROM works directly without a boost converter. At the high end, the 5.5V absolute maximum (implied by the 1.6V to 5.5V operating range) lets it survive on a 5V rail with margin. The wide range also simplifies a dual-voltage design where the memory must follow the system into sleep mode at 1.8V and wake to 3.3V.","metaTitle":"Microchip 24CW640T-I/ST 64Kbit I²C EEPROM, 1 MHz, 8-TSSOP","metaDescription":"Microchip 24CW640T-I/ST 64Kbit I²C EEPROM, 1 MHz clock, 450 ns access, 1.6V to 5.5V supply, industrial temp -40°C to 85°C, 8-TSSOP.","metaKeywords":null},"attributes":{"series":"24CW","packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"Series":"24CW","Package":"Tape & Reel (TR); Cut Tape (CT)","Technology":"EEPROM","Access Time":"450 ns","Memory Size":"64Kbit","Memory Type":"Non-Volatile","Memory Format":"EEPROM","Mounting Type":"Surface Mount","Package / Case":"8-TSSOP (0.173\\\", 4.40mm Width)","Clock Frequency":"1 MHz","lifecycle_stage":"eol_hot","Memory Interface":"I²C","Voltage - Supply":"1.6V ~ 5.5V","Memory Organization":"8K x 8","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"8-TSSOP","Write Cycle Time - Word, Page":"5ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.47","priceTiers":[{"qty":1,"price":"$0.47000","currency":"USD"},{"qty":25,"price":"$0.46480","currency":"USD"},{"qty":2500,"price":"$0.46500","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/24CW640T-I%2FST/alternatives.json"},"ai":{"faq":[{"question":"Can 24CW640T-I/ST replace 24CW640-I/ST directly?","answer":"The 'T' suffix in 24CW640T-I/ST indicates Tape & Reel packaging (the '-I/ST' part is the same 8-TSSOP package and industrial temperature grade). The 24CW640-I/ST is the tube/tray variant. Electrically they are identical — same 64 Kbit I²C EEPROM, same 1 MHz clock, same 1.6V to 5.5V supply. The only difference is the shipping medium, so a direct replacement on the board is fine as long as your assembly line accepts reels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/24CW640T-I-ST","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/24CW640T-I-ST when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}