Diodes Incorporated — AH371xQ Magnetic Latch Switches

The new AH371xQ series of high-voltage Hall-effect latches from Diodes Incorporated provide stable and predictable performance in automotive applications that are exposed to magnetic interference.  

Qualified to AEC-Q100 Grade 0, the AH371xQ bipolar magnetic latch switches operate over a voltage range of 3 V to 27 V, with 40 V load dump protection, for use in circuits powered by a 12 V automotive battery. Supporting numerous in-vehicle comfort and engine management applications, these Diodes latches may be used for brushless dc (BLDC) motor control, valve operation, linear and incremental rotary encoders, and position sensing functions.   

The superior performance of the AH371xQ latch switches is due to a proprietary Hall sensor plate and a chopper-stabilized design which mitigate the effects of thermal variation and provide excellent immunity to interference from stray magnetic fields.  

Specified for operation with magnets rated from 25 gauss to 140 gauss, the series is available in a selection of six sensitivity options. Featuring tight operating windows and low temperature coefficients for switch points, the AH371xQ latches give engineers scope to specify the right magnetic operating and release values to fit the application’s sensing distance and magnet strength.  

Protection features integrated into the latch switches include a reverse blocking diode, over-current protection, and over-voltage clamp.