{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"M24C64M-FCU6T/TF","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"M24C64M-FCU6T-TF","canonicalUrl":"https://icboms.com/stmicroelectronics/M24C64M-FCU6T-TF","factsUrl":"https://icboms.com/api/mcp/products/M24C64M-FCU6T%2FTF","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics M24C64M-FCU6T/TF, 64Kbit I²C EEPROM, 4-WLCSP (4-XFBGA), 1.7–5.5 V supply, 1 MHz clock, 450 ns access, -40°C to 85°C.","salesMarkdown":"## 64 Kbit I²C EEPROM in a 4-WLCSP — the footprint drives the fit The STMicroelectronics M24C64M-FCU6T/TF is a 64 Kbit serial EEPROM with an I²C interface, organized as 8 K x 8 bits. It is built in a 4-bump wafer-level chip-scale package (4-WLCSP, also listed as 4-XFBGA), which makes it essentially the size of the die itself — about 0.8 mm square. That footprint is the headline constraint: it saves board space in compact portable and IoT designs but rules out hand-soldering and most rework. Clock frequency is rated at 1 MHz, supporting Fast-mode Plus I²C throughput for parameter storage, calibration tables, or boot configuration reads. Access time is specified at 450 ns. That is the time from the I²C slave address match to the first data bit becoming available on SDA. At 1 MHz (1 µs bit period), 450 ns is within the SCL low-to-data-valid window, so no extra wait states are needed. If you are replacing a slower EEPROM in an existing layout, verify the master's SDA setup/hold margins — the 450 ns figure is fast enough for standard I²C timing but not a zero-hold part. ## Write cycle time and endurance Page and word writes take 5 ms maximum. For a 64 Kbit device, that means a full-memory rewrite (all 8 K bytes in page mode) takes about 1.3 seconds if the master issues back-to-back page writes. The I²C bus is tied up during the internal write cycle — the device does not acknowledge new commands until the cycle completes. No endurance cycle count is in the listing, but the M24C64 family is typically rated for 1 million write cycles and 40-year data retention. Plan for wear leveling if writing the same byte more than a few thousand times over the product life. The M24C64M-FCU6T/TF is listed as obsolete. Stock still exists in the spot market and on distributor shelves, but replenishment is not coming. The base product number is M24C64, and ST's current-production parts in this family (e.g., M24C64-FCU6T/TF) are typically available as active. Confirm the exact suffix and temperature grade against your system requirements before swapping. ## Where this EEPROM fits — and where it does not The 4-WLCSP package is the smallest available for this density, which makes it a fit for wearable, medical patch, and space-constrained sensor modules. The trade-off: no package leads to inspect, no rework without a hot-air station and underfill, and the board must be flat — no flex circuits without a rigid stiffener under the die.","metaTitle":"STMicroelectronics M24C64M-FCU6T/TF 64Kbit I²C EEPROM","metaDescription":"STMicroelectronics M24C64M-FCU6T/TF 64Kbit I²C EEPROM in 4-WLCSP. 1 MHz clock, 1.7–5.5 V supply, 450 ns access, -40°C to 85°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"Mfr":"STMicroelectronics","Series":"-","Package":"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":"4-XFBGA","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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/M24C64M-FCU6T%2FTF/alternatives.json"},"ai":{"faq":[{"question":"Is M24C64M-FCU6T/TF obsolete?","answer":"Yes, the M24C64M-FCU6T/TF is listed as obsolete. No last-time-buy window is active. For new production, look at current-suffix M24C64 parts in the same 4-WLCSP package — verify the exact order code matches your temperature grade and supply voltage requirements."},{"question":"What is the maximum clock frequency of M24C64M-FCU6T/TF?","answer":"The maximum clock frequency is 1 MHz, which corresponds to Fast-mode Plus I²C operation. This supports 1 Mbit/s data transfer on the bus."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/M24C64M-FCU6T-TF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/M24C64M-FCU6T-TF 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}}