Allegro MicroSystems Inc. Chopper-Stabilized Precision Hall Switch A1120LUA-T

The A1120LUA-T is a chopper-stabilized precision Hall-effect switch designed for unipolar magnetic switching in automotive and industrial applications. It operates from an unregulated supply of 3 to 24 V and features an open-drain output capable of sinking up to 25 mA. The device is housed in a three-lead ultra-mini SIP package (suffix UA) with a matrix HD style recommended for new designs. It is AEC-Q100 automotive qualified and supports ambient operating temperatures from -40°C to 150°C. The switch activates with a south magnetic pole of sufficient strength and deactivates when the field is removed. On-chip protection includes reverse battery, output short-circuit, and overvoltage tolerance up to 26.5 V.