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 (
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 downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`mh253eso.step`	59 KB	You want the bare part, or you mark your own boards.
`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 (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