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M41T81M6F

Public Made by Adom

by adom

STMicroelectronics Real-time Clocks (RTC), SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

markdown

M41T81M6F

STMicroelectronics · Real-time Clocks (RTC) · SOIC-8

M41T81M6F from STMicroelectronics, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 XI input Oscillator input. Connects to one terminal of the external 32.768 kHz crystal. Internal load capacitance (12.5 pF) is integrated on-chip.
2 XO output Oscillator output. Connects to the other terminal of the external 32.768 kHz crystal.
3 VBAT power_in Battery supply voltage. Connects to a small lithium button cell to sustain SRAM and clock operation when VCC falls below the switchover trip point.
4 VSS power_in Ground reference (0 V).
5 SDA bidirectional I2C serial data input/output (open-drain). Requires an external pull-up resistor to a positive supply. Supports 400 kHz Fast-mode I2C.
6 SCL input I2C serial clock input. Requires an external pull-up resistor to a positive supply. Supports 400 kHz Fast-mode I2C.
7 IRQ/FT/OUT/SQW output Multi-function open-drain output. Software-selectable between alarm interrupt (IRQ, active low), frequency test (FT), general output driver (OUT), or programmable square-wave (SQW). Square-wave function has the highest priority. Requires external pull-up.
8 VCC power_in Main supply voltage, 2.0 V to 5.5 V. When VCC falls below the VSO trip point (VBAT - 0.5 V typ), the device automatically switches to VBAT.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOIC-8
Category RTC
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • M41T81M6F

CAD (KiCad official)

  • Symbol: M41T81M6F
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: m41t81m6f-etched.step / m41t81m6f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); m41t81m6f.step / m41t81m6f.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (29 pp, sha256 cd94dc7a56064d62, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF