{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"M24C64S-FCU6T/T","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"M24C64S-FCU6T-T","canonicalUrl":"https://icboms.com/stmicroelectronics/M24C64S-FCU6T-T","factsUrl":"https://icboms.com/api/mcp/products/M24C64S-FCU6T%2FT","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics M24C64S-FCU6T/T, 64Kbit serial EEPROM, I²C interface, 1 MHz clock, 650 ns access time, 1.7V to 5.5V supply, -40°C to 85°C, 4-WLCSP package.","salesMarkdown":"## 64Kbit serial EEPROM in a 4-bump WLCSP The 4-bump WLCSP package (4-XFBGA) is the smallest footprint option in the M24C64 family, intended for space-constrained PCBs where a standard SOIC or TSSOP cannot fit. ## Obsolete — plan for a replacement The M24C64S-FCU6T/T is officially marked as Obsolete by STMicroelectronics. For new designs or sustained production, a replacement must be qualified. The base product number M24C64 covers multiple package variants; the WLCSP version is the one being phased out. ## I²C bus timing and write cycle The I²C interface runs at a 1 MHz clock frequency, supporting fast-mode plus data rates. Access time is 650 ns, which is the read cycle time from the last address. The write cycle time for a word or page is 5 ms — a standard figure for this density class. When budgeting firmware timing for page writes, account for the 5 ms non-acknowledging period after each write command. ## Package and handling for the 4-WLCSP This is a chip-scale package with no leads — the solder bumps are directly on the die. Surface-mount assembly requires a stencil designed for the bump pitch and a reflow profile compatible with the board's solder mask.","metaTitle":"STMicroelectronics M24C64S-FCU6T/T EEPROM, 64Kbit, I²C","metaDescription":"STMicroelectronics M24C64S-FCU6T/T 64Kbit serial EEPROM, I²C interface, 1 MHz clock, 1.7V-5.5V supply, -40°C to 85°C, 4-WLCSP.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"Mfr":"STMicroelectronics","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Technology":"EEPROM","Access Time":"650 ns","Memory Size":"64Kbit","Memory Type":"Non-Volatile","Memory Format":"EEPROM","Mounting Type":"Surface Mount","Package / Case":"4-XFBGA, WLCSP","Product Status":"Obsolete","Clock Frequency":"1 MHz","lifecycle_stage":"eol_hot","Memory Interface":"I²C","Voltage - Supply":"1.7V ~ 5.5V","Base Product Number":"M24C64","Memory Organization":"8K x 8","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"4-WLCSP","Write Cycle Time - Word, Page":"5ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.0600","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b744175cc65a470ddf7ae253c1ef2717.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/M24C64S-FCU6T%2FT/alternatives.json"},"ai":{"faq":[{"question":"What is the replacement for M24C64S-FCU6T/T?","answer":"STMicroelectronics has not published a direct pin-compatible replacement for the M24C64S-FCU6T/T in the same 4-WLCSP package. The base M24C64 family includes other package options (SOIC, TSSOP, UFDFPN) that are functionally identical but not footprint-compatible. For a drop-in replacement, buyers should search for other 64Kbit I²C EEPROMs in a 4-bump WLCSP from manufacturers such as Microchip or Onsemi, and verify the pinout and supply voltage range against the design."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/M24C64S-FCU6T-T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/M24C64S-FCU6T-T 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}}