# HAL251UA

**Hallwee** · Hall Switches · TO-92S

HAL251UA from Hallwee, in a TO-92S. 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 | VDD | power_in | Power supply pin; operating Vcc range is 1.65 V to 5.5 V (absolute maximum -0.5 to 6.0 V), with a 0.1 µF bypass capacitor to Gnd in the typical application. |
| 2 | GND | power_in | Ground pin. |
| 3 | OUT | output | Push-pull output pin; output current max 5.0 mA operating (10 mA absolute maximum), VOUT max 5.5 V, saturation drop max 0.4 V at IOUT=2 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Hallwee |
| Package | TO-92S |
| Category | Magnetic Sensors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `HAL251UA`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92S (KiCad packages3D, STEP)
- 3D model files: `hal251ua-etched.step` / `hal251ua-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `hal251ua.step` / `hal251ua.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Hallwee datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757968325068902400) (6 pp, sha256 `46060496a9a5588f`, retrieved 2026-10-18, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/hal251ua-datasheet.pdf)