Unipolar Hall-Effect Switches

temperature switch, hall sensor, hall effect switchesHall-effect switches are most commonly used in sensing absolute position or proximity, because they require a south pole of sufficient strength to turn the output on and then removal of that field to turn the output off. These contactless sensing solutions require few external components and can withstand the hostile operating conditions of automotive applications. Typical applications include: shift selectors, wiper end/home position, door ajar/open, and vane-interrupt systems. Allegro also offers a wide selection of two-wire devices, which are often used in safety critical applications, such as seat belt buckle and seat position sensing.

Specific advantages of Allegro’s solutions include:

  • 4× chopper stabilization for superior temperature stability and resistance to physical stress
  • Industry-leading jitter performance that is 2× better than competitor devices 
  • Low-voltage (3 V) operation
  • Key performance characteristics specified over the full operating voltage and ambient temperature ranges
  • Designed to survive harsh automotive environments

Allegro has a broad range of devices sensitivities that cover just about any application requirement.

Solutions using temperature switches, Hall-effect switches, and magnetic sensor IC switches




The following Hall-effect unipolar switches have been discontinued: A1140, A1142, A1143, A1145, A1146, A1147, A1148A1180, A1181, A1182, A1183, A1184, A1185, A1186, A3161, A3163, A3245, A3250, A3251


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