# 78M05AS

**YFW** · Linear Voltage Regulators (LDO) · TO-263

78M05AS from YFW, in a TO-263. 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 | IN | power_in | Unregulated positive input voltage, absolute maximum 25 V and specified over 7 to 25 V in the electrical characteristics. |
| 2 | GND | power_in | Ground reference for input and output, also connected to the metal tab of the TO-263 package. |
| 3 | OUT | power_out | Regulated fixed 5 V output (4.75 to 5.25 V) delivering up to 1.0 A with thermal overload and short circuit protection. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | YFW |
| Package | TO-263 |
| Category | Power Management |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `78M05AS`
- Footprint: `Package_TO_SOT_SMD:TO-263-2`
- 3D model: TO-263 (KiCad packages3D, STEP)
- 3D model files: `78m05as-etched.step` / `78m05as-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `78m05as.step` / `78m05as.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [YFW datasheet](docs/78m05as-datasheet.pdf) (5 pp, sha256 `159118edd62d951f`, retrieved 2026-10-27, 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/78m05as-datasheet.pdf)