# MH253ESO

**MST Magnesensor Tech MST** · Hall Sensor · SOT-23-3L

MH253ESO from MST Magnesensor Tech MST, 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 input, 2.5 V to 6 V operating range (7 V absolute max). Typical supply current 2.6 mA. Reverse voltage protection not included; a 100 Ω series resistor is recommended for reverse protection. |
| 2 | Output | output | Open-drain digital output. Pulls low (VDSON <= 400 mV at 10 mA) when magnetic field exceeds operate point (|B| > BOP, typ 30 Gauss); high-impedance (leakage <= 10 uA) when released. Requires external pull-up (typ 10 kOhm). Max sink current 25 mA; output voltage max 6 V. |
| 3 | GND | power_in | Ground reference pin for the device. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MST Magnesensor Tech MST |
| Package | SOT-23-3L |
| Category | Sensor |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `MH253ESO`
- `MH253ESOESQ`
- `MH253ESOEUA`
- `MH253ESOKUA`

## CAD (KiCad official)

- Symbol: `MH253ESO`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `mh253eso-etched.step` / `mh253eso-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mh253eso.step` / `mh253eso.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`mh253eso.step`](mh253eso.step) | 59 KB | You want the bare part, or you mark your own boards. |
| [`mh253eso-etched.step`](mh253eso-etched.step) | 1.6 MB | You want the part with `MH253ESO` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 386 faces against 69 in the bare model. It
survives export, section views, and rendering in any CAD tool, and it drops straight
into KiCad or Fusion with no extra setup.

## Provenance

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

- **Datasheet:** [MST Magnesensor Tech MST datasheet](docs/mh253eso-datasheet.pdf) (5 pp, sha256 `9d3b31b816690eaa`, 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/mh253eso-datasheet.pdf)