# M41T56M6F

**STMicroelectronics** · Real Time Clocks · SOIC-8-150mil

M41T56M6F from STMicroelectronics, in a SOIC-8-150mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | OSCI | input | Oscillator input for the external 32.768 kHz crystal, which has 12.5 pF load capacitance integrated in the device. |
| 2 | OSCO | output | Oscillator output to the external 32.768 kHz crystal (printed as OCSO in Table 1), with a maximum crystal series resistance of 60 kΩ. |
| 3 | VBAT | power_in | Battery supply input, 2.5 to 3.5 V (3 V typ), with 450 nA typical battery current at 3 V; the device switches to it when VCC falls below VBAT. |
| 4 | VSS | power_in | Ground. |
| 5 | SDA | bidirectional | I2C serial data input/output, which needs a pull-up resistor to a positive supply and supports up to 100 kHz. |
| 6 | SCL | input | I2C serial clock input from the master, 0 to 100 kHz, which needs a pull-up resistor to a positive supply. |
| 7 | FT/OUT | output | Open-drain frequency test (512 Hz) or output driver pin reflecting the OUT bit, which needs an external pull-up resistor and has VOL max 0.4 V at 5 mA. |
| 8 | VCC | power_in | Main supply voltage, 4.5 to 5.5 V, with timekeeping down to 2.5 V and an absolute maximum of 7 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SOIC-8-150mil |
| Category | Clock/Timing |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `M41T56M6F`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8-150mil (KiCad packages3D, STEP)
- 3D model files: `m41t56m6f-etched.step` / `m41t56m6f-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `m41t56m6f.step` / `m41t56m6f.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588907620727443456) (27 pp, sha256 `59407420b31f518c`, retrieved 2026-10-10, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/m41t56m6f-datasheet.pdf)