{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"M41T81M6F","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"M41T81M6F","canonicalUrl":"https://icboms.com/stmicroelectronics/M41T81M6F","factsUrl":"https://icboms.com/api/mcp/products/M41T81M6F","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics M41T81M6F Clock/Calendar RTC, I²C interface, 2-5.5V, alarm, watchdog, 8-SOIC, Tape & Reel.","salesMarkdown":"## RTC with I²C bus and on-chip timers The M41T81M6F is an I²C-compatible real-time clock from STMicroelectronics, providing timekeeping in HH:MM:SS:hh (24-hour) and calendar in YY-MM-DD-dd format. Packaged in a standard 8-pin SOIC (3.90 mm body width) for surface-mount assembly, it integrates an alarm, a watchdog timer, and a programmable square-wave output — functions that offload periodic housekeeping from the host MCU. Supply voltage spans 2 V to 5.5 V, with a separate battery-backup input requiring 2.5 V to 3.5 V. The timekeeping current draw is 100 µA maximum across the full supply range, making it suitable for battery-powered or always-on systems where the RTC must remain alive during a main power loss. ## Active production, ROHS3, and industrial temp range The part is sourced through independent distribution channels; availability and current pricing are confirmed at RFQ against the BOM quantity.","metaTitle":"M41T81M6F RTC, Clock/Calendar, I2C, 8-SOIC, Active","metaDescription":"STMicroelectronics M41T81M6F real-time clock (RTC) with I²C interface, alarm, watchdog, 2-5.5V supply, -40 to +85°C. Active, ROHS3. Order for BOM.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Type":"Clock/Calendar","Package":"Tape & Reel (TR); Cut Tape (CT)","Features":"Alarm, Leap Year, Square Wave Output, Watchdog Timer","Interface":"I²C, 2-Wire Serial","Date Format":"YY-MM-DD-dd","Time Format":"HH:MM:SS:hh (24 hr)","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"2V ~ 5.5V","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"8-SOIC","Voltage - Supply, Battery":"2.5V ~ 3.5V","Current - Timekeeping (Max)":"100µA @ 2V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.06","priceTiers":[{"qty":1,"price":"$3.06000","currency":"USD"},{"qty":10,"price":"$2.74900","currency":"USD"},{"qty":25,"price":"$2.59880","currency":"USD"},{"qty":100,"price":"$2.25210","currency":"USD"},{"qty":250,"price":"$2.13664","currency":"USD"},{"qty":500,"price":"$1.91720","currency":"USD"},{"qty":1000,"price":"$1.61691","currency":"USD"},{"qty":2500,"price":"$1.53606","currency":"USD"},{"qty":5000,"price":"$1.47832","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/c2baa02eb8b9fd260f350762213c978c.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/M41T81M6F/alternatives.json"},"ai":{"faq":[{"question":"Does the M41T81M6F include a watchdog timer or alarm?","answer":"Yes. The on-chip features include an alarm, a watchdog timer, a leap-year correction, and a programmable square-wave output. These are integrated into the RTC block and do not consume additional MCU I/O or timer resources."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/M41T81M6F","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/M41T81M6F when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}