A1120LLHLT-T from Allegro MicroSystems LLC, in a SOT-23W. 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	VCC	power_in	Supply voltage input. Operating range 3.0 V to 24 V. A bypass capacitor (typ. 0.1 µF) from VCC to GND is recommended for noise immunity.
2	GND	power_in	Ground return for the device.
3	VOUT	output	Open-drain digital Hall switch output. Sinks up to 25 mA when the magnetic field exceeds the operate point (BOP); high-impedance (requires external pull-up) when the field falls below the release point (BRP).

Key specifications

Parameter	Value
Manufacturer	Allegro MicroSystems LLC
Package	SOT-23W
Category	Sensor
Pins	3

Ordering variants

A1120LLHLT-T
A1120LLHLT-TLUA-T

CAD (KiCad official)

Symbol: A1120LLHLT-T
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23W (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`a1120llhlt-t.step`	59 KB	You want the bare part, or you mark your own boards.
`a1120llhlt-t-etched.step`	1.3 MB	You want the part with `A1120LLHLT-T` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 349 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: Allegro MicroSystems LLC datasheet (18 pp, sha256 2e2d51c564dee4c6, 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