Hall-effect latches and bipolar switches are most commonly used in sensing multipole ring magnets for speed sensing, motor commutation, or position encoding, because these require a south pole of sufficient strength to turn the output on and a north pole of sufficient strength to turn the output off. These contactless sensing solutions require few external components and can withstand the hostile operating conditions of automotive applications.
Specific advantages of Allegro’s solutions include:
Allegro is a market leader in the area of Hall latches, and has a broad range of devices that cover any desired magnetic switchpoints for just about any application requirement.
Certain special-purpose latches are designed to survive very harsh transients without external components. See EMC-Robust Chopper-Stabilized Latches. Continuous-time devices are also available for those specific applications that call for them. See Continuous-Time Latches.
The following Hall-effect latches and bipolar switches have been discontinued: