# CH442SR

**COSEMITECH** · Hall Sensor · SOT-23-3L

CH442SR from COSEMITECH, in a SOT-23-3L. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VDD | power_in | Supply voltage pin. Operating range 2.5 V to 22 V (absolute max 24 V); typical supply current 1.6 mA at 3.3 V. Integrated regulator and reverse-battery protection down to -22 V. |
| 2 | OUT | output | Open-collector output pin. Sinks up to 25 mA (VDSon <= 0.4 V at 20 mA); output leakage <= 10 uA at VOUT = 24 V. State latches based on magnetic polarity (BOP/BRP) per the CH442 switching function. |
| 3 | GND | power_in | Ground reference pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | COSEMITECH |
| Package | SOT-23-3L |
| Category | Sensor |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `CH442SR`
- `CH442SRNSR`
- `CH442SRTB`
- `CH442SRNTB`
- `CH442SRER`
- `CH442SRNER`

## CAD (KiCad official)

- Symbol: `CH442SR`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `ch442sr-etched.step` / `ch442sr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ch442sr.step` / `ch442sr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [COSEMITECH datasheet](docs/ch442sr-datasheet.pdf) (14 pp, sha256 `d85c12a1c6a9bd48`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ch442sr-datasheet.pdf)