Allegro MicroSystems Inc. Chopper-Stabilized Precision Hall-Effect Switch A1122EUA-T

The A1122EUA-T is a chopper-stabilized precision Hall-effect switch designed for automotive applications, featuring a 3-pin SIP through-hole package (UA style) with a matrix HD layout recommended for new designs. It operates from a 3 to 24 V unregulated supply, sinks up to 25 mA at its open-drain output, and is AEC-Q100 qualified for ambient temperatures up to 150°C. The device offers south-pole-activated switching with a typical operate point of 150 G and release point of 125 G, includes reverse-battery and output short-circuit protection, and maintains stability across temperature extremes due to dynamic offset cancellation. It is lead-free with a matte-tin-plated leadframe.