# LM809M3-4.38

**Texas Instruments** · Supervisor And Reset ICs · SOT-23-3

LM809M3-4.38 from Texas Instruments, in a SOT-23-3. 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 | GND | power_in | Ground reference for the supervisor. |
| 2 | RESET | output | Active-low reset output (LM809): RESET remains low while VCC is below the reset threshold and for 240 ms after VCC rises above the reset threshold, with VOL specified at up to 0.4 V at 3.2 mA sink for the 4.38 V version. |
| 3 | VCC | power_in | Supply voltage monitored against the factory-programmed reset threshold; recommended input range is 1.2 V to 5.5 V over -40°C to 105°C and the absolute maximum is 6 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-3 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `LM809M3-4.38`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `lm809m3-4-38-etched.step` / `lm809m3-4-38-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm809m3-4-38.step` / `lm809m3-4-38.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lm809) (20 pp, sha256 `e95efdb789aa7ac6`, retrieved 2026-10-08, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/lm809m3-4-38-datasheet.pdf)