Allegro MicroSystems Inc. Chopper-Stabilized Precision Hall-Effect Switch A1122LUA-T

The A1122LUA-T is a chopper-stabilized precision Hall-effect switch designed for automotive applications, offering unipolar switching with a south magnetic pole to activate the output. It operates from an unregulated supply voltage of 3 to 24 V and features output short-circuit and reverse-battery protection. The device is AEC-Q100 automotive qualified and supports operation from -40°C to 150°C ambient temperature. It is housed in a three-lead ultra-mini SIP package (suffix UA) with through-hole mounting, and the matrix HD style variant is recommended for new designs. The output is an open-drain configuration capable of sinking up to 25 mA, with a switch-on point of 150 G and switch-off point of 125 G.