# HAL41FSO

**Hallwee** · Hall Switches · SOT-23-3L

HAL41FSO from Hallwee, in a SOT-23-3L. 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 | Supply voltage pin; the datasheet lists an absolute maximum VDD of 80 V, supply reverse-voltage protection, and an overvoltage capability of 80 V. |
| 2 | Gnd | power_in | Ground pin for the sensor circuit. |
| 3 | Out | output | Open-drain output pin that delivers a digital voltage signal switched by the Schmitt-trigger stage in response to the magnetic field; an external pull-up resistor is required (application circuit uses RL = 4.7 kΩ). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Hallwee |
| Package | SOT-23-3L |
| Category | Magnetic Sensors |
| Pins | 3 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage (absolute maximum) | VDD |  |  | 80 | V |  | 2 |
| Supply current (absolute maximum) | IDD |  |  | 80 | mA |  | 2 |
| Output voltage (absolute maximum) | VOUT |  |  | 40 | V |  | 2 |
| Output current (absolute maximum) | IOUT |  |  | 40 | mA |  | 2 |
| Operating temperature range | TA | -40 |  | 150 | ℃ |  | 2 |
| Storage temperature range | TS | -50 |  | 165 | ℃ |  | 2 |
| Maximum allowable power dissipation | PD |  |  | 450 | mW |  | 2 |

## CAD (KiCad official)

- Symbol: `HAL41FSO`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `hal41fso-etched.step` / `hal41fso-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `hal41fso.step` / `hal41fso.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Hallwee datasheet](docs/hal41fso-datasheet.pdf) (4 pp, sha256 `27f7c745c5c682f1`, 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-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/hal41fso-datasheet.pdf)