Outputs an analog voltage proportional to the magnetic field through its face, centered at half the supply and swinging up for one pole and down for the other. Sensitivity is about 1.3 mV per gauss, and because the output is ratiometric to VCC it tracks the supply so an ADC on the same rail reads field directly. It runs from 4.5 to 6 V in a three-lead SOT-23W. A simple analog sensor for position, current (via a magnet), and proximity.

Pinout

Pin	Name	Type	Function
1	VCC	power_in	Supply pin. Connects power supply to chip. Operating range 4.5 to 6.0 V; absolute max 8 V. Typical supply current up to 11 mA. Bypass with CBYPASS capacitor to GND.
2	VOUT	output	Analog output from Hall-effect sensor. Ratiometric rail-to-rail; quiescent output = VCC/2 (2.5 V typical at VCC = 5 V). Sensitivity 1.3 mV/G typical (A1302). Output resistance ~2 ohm, max sink current 10 mA.
3	GND	power_in	Ground reference for supply and output.

Key specifications

Parameter	Value
Type	Ratiometric linear Hall-effect sensor
Output	Analog, ratiometric to VCC
Sensitivity	1.3 mV/G (typ)
Quiescent output	VCC/2 (no field)
Supply	4.5-6 V
Bandwidth	20 kHz
Package	SOT-23W (3-lead)

Ordering variants

A1302KUA-T (SIP-3, UA)
A1302KLHLX-T (SOT-23W)

CAD (KiCad official)

Symbol: Sensor_Magnetic:A1302xLH (KiCad official)
Footprint: Package_TO_SOT_SMD:SOT-23W
3D model: SOT-23W (KiCad packages3D, STEP)

Provenance

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

Datasheet: Allegro MicroSystems datasheet (10 pp, sha256 65c35521e270ff28, retrieved 2026-08-17, tier: manufacturer)
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