# AH401FSU

**Alfa(中科阿尔法)** · Hall Switches · SOT-23-3L

AH401FSU from Alfa(中科阿尔法), 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 | VCC | power_in | Supply pin with an operating range of 3.0V to 60V, featuring reverse-voltage protection on the power pin and an overvoltage protection capability of 80V. |
| 2 | VOUT | output | Open-collector digital output that can drive up to 30mA maximum, with an absolute maximum output voltage of 80V and output current of 40mA. |
| 3 | GND | power_in | Ground pin for the device. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Alfa(中科阿尔法) |
| 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 |
|---|---|---|---|---|---|---|---|
| 电源电压 (Supply voltage) | VCC | 3 |  | 60 | V |  | 4 |
| 电源电流 (Supply current) | ICC |  | 4.8 | 8 | mA |  | 4 |
| 输出漏电流 (Output leakage current) | IOLEAK |  |  | 10 | uA |  | 4 |
| 输出电压 (Output saturation voltage) | VSAT |  |  | 0.4 | V | IOUT=20mA | 4 |
| 输出电流 (Output current) | IOUT |  |  | 30 | mA |  | 4 |
| 输出上升时间 (Output rise time) | TR |  |  | 1 | us | RL=10kΩ, CL=20pF | 4 |
| 输出下降时间 (Output fall time) | TF |  |  | 1.5 | us | RL=10kΩ, CL=20pF | 4 |
| 工作点 (Operate point) | Bop | 10 | 45 | 80 | Gs | RL=10kΩ, CL=20pF | 4 |
| 释放点 (Release point) | Brp | -80 | -45 | -10 | Gs | RL=10kΩ, CL=20pF | 5 |
| 回差 (Hysteresis) | BHYS |  | 90 |  | Gs |  | 5 |
| 电源电压 (Supply voltage, absolute maximum) | VCC | -60 |  | 80 | V |  | 4 |
| 输出电压 (Output voltage, absolute maximum) | VOUT | -0.5 |  | 80 | V |  | 4 |
| 输出电流 (Output current, absolute maximum) | IOUT | 0 |  | 40 | mA |  | 4 |
| 工作温度 (Operating junction temperature) | TJ | -40 |  | 150 | ℃ |  | 4 |
| 存储温度 (Storage temperature) | TSTG | -50 |  | 165 | ℃ |  | 4 |

## CAD (KiCad official)

- Symbol: `AH401FSU`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `ah401fsu-etched.step` / `ah401fsu-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ah401fsu.step` / `ah401fsu.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Alfa(中科阿尔法) datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590907734479499264) (9 pp, sha256 `5784e96cf53ca621`, retrieved 2026-10-20, 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/ah401fsu-datasheet.pdf)