Allegro MicroSystems Inc. AC Coupled Differential Geartooth Sensor A1422LK-T

The A1422LK-T is an AC-coupled Hall-effect differential sensor IC in a 4-pin SIP package, designed to detect motion from rotating ring magnets or ferrous targets using differential magnetic field changes. It features an integrated tracking capacitor, eliminating the need for an external filter, and operates with a supply voltage range of 4.0 to 26.5 V. The device switches with symmetrical thresholds near zero magnetic flux density and has an output compatible with CMOS logic, capable of sourcing or sinking 20 mA. It supports input frequencies from 20 Hz to 30 kHz and functions within an ambient temperature range of -40°C to 150°C. Reverse battery and output protection are included, and the part is lead-free with a matte tin finish.