{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"M24C64-FCU6TP/TF","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"M24C64-FCU6TP-TF","canonicalUrl":"https://icboms.com/stmicroelectronics/M24C64-FCU6TP-TF","factsUrl":"https://icboms.com/api/mcp/products/M24C64-FCU6TP%2FTF","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics M24C64-FCU6TP/TF, 64Kbit I²C EEPROM, 1 MHz clock, 450 ns access, 1.7V-5.5V supply, -40°C to 85°C, 4-WLCSP (0.80x0.67).","salesMarkdown":"## 64 Kbit I²C EEPROM in a 4-ball WLCSP — what this chip is The STMicroelectronics M24C64-FCU6TP/TF is a 64 Kbit serial EEPROM with an I²C interface, organized as 8 K × 8 bits. It clocks at 1 MHz and delivers a 450 ns access time, which means the bus master waits one I²C clock cycle per byte read — a timing detail that matters when you are budgeting read latency in a firmware boot or calibration-load sequence. The 4-XFBGA WLCSP package (0.80 mm × 0.67 mm body) is a wafer-level chip-scale package — no leads, no exposed pad, just four solder balls on the bottom. The M24C64-FCU6TP/TF carries an Obsolete lifecycle status. STMicroelectronics no longer manufactures this specific variant in the 4-WLCSP package. For a production BOM that already uses this order code, the path forward is either sourcing existing stock through independent distribution or qualifying a replacement. The base product number M24C64 covers a broad family of 64 Kbit I²C EEPROMs in different packages — SOIC, TSSOP, UFDFPN — but the FCU6 suffix is unique to the WLCSP variant, so a pin-compatible drop-in in the same footprint does not exist in the active M24C64 line. Any replacement will require a PCB layout change or a package adapter. ## 1 MHz I²C and 450 ns access — sizing the bus timing The 1 MHz clock frequency is the maximum SCL rate for this device. At that speed, the I²C bus runs in fast-mode plus (Fm+). If your host controller runs a bit-banged I²C or a slow MCU with marginal I²C timing, the 450 ns window is tight; a 400 kHz bus clock gives more margin. The write cycle time is 5 ms per page or byte, which is the period after a STOP condition during which the EEPROM is busy programming — the master must not send another command during that window. ## WLCSP package — layout and assembly notes The 4-WLCSP package measures 0.80 mm × 0.67 mm with a 0.40 mm ball pitch. That is a fine-pitch wafer-level chip-scale package — no molded body, just the silicon die with solder balls directly attached. The PCB land pattern must match the ball layout exactly; there is no room for via-in-pad without filling and capping. The package is moisture-sensitive, so MSL handling procedures apply. For rework, a hot-air nozzle sized for a 1 mm × 1 mm die works, but the small ball size makes alignment critical — optical alignment under a microscope is standard practice in a rework lab.","metaTitle":"STMicroelectronics M24C64-FCU6TP/TF 64Kbit I²C EEPROM, 1 MHz","metaDescription":"STMicroelectronics M24C64-FCU6TP/TF 64Kbit I²C EEPROM with 1 MHz clock, 450 ns access time, 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":"450 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 (0.80x0.67)","Write Cycle Time - Word, Page":"5ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f80a2f163f84bd6e64a778a5e4f1c6d9.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is the M24C64-FCU6TP/TF obsolete?","answer":"Yes, the M24C64-FCU6TP/TF is listed as Obsolete. STMicroelectronics has discontinued this specific 4-WLCSP variant. For a replacement, you will need to either source existing surplus stock or migrate to a different package variant within the M24C64 family, which will require a PCB layout change."},{"question":"What is the replacement for M24C64-FCU6TP/TF?","answer":"There is no direct pin-compatible drop-in replacement in the same 4-WLCSP footprint. The base M24C64 family includes 64 Kbit I²C EEPROMs in SOIC-8, TSSOP-8, and UFDFPN-8 packages, but the FCU6 suffix is unique to the WLCSP variant. Any replacement will require a PCB layout change or a socket adapter. The closest functional equivalent is another M24C64 variant in a different package — for example, the M24C64-WMN6TP in SOIC-8 — but verify the pinout and footprint compatibility for your board."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/M24C64-FCU6TP-TF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/M24C64-FCU6TP-TF when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T11:53:02.399Z","lastPublished":"2026-07-16T11:53:02.399Z","indexable":true}}