# 78S12M

**UNI SEMIC** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89

78S12M from UNI SEMIC, in a SOT-89. 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 | VOUT | power_out | Regulated 12V output, delivering up to 120 mA with internal current limiting and thermal shutdown. |
| 2 | GND | power_in | Ground reference pin of the regulator; the tab is also labelled GND in the package drawing. |
| 3 | VIN | power_in | Unregulated positive input voltage to the regulator. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UNI SEMIC |
| Package | SOT-89 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `78S12M`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `78s12m-etched.step` / `78s12m-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `78s12m.step` / `78s12m.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UNI SEMIC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8756968115232223232) (14 pp, sha256 `c5d7a765b7608fd4`, retrieved 2026-10-18, 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/78s12m-datasheet.pdf)