The A118X is a family of two-wire, unipolar Hall-effect switch ICs designed for use in automotive and industrial high-temperature applications. The new Allegro MicroSystems devices use a patented high-frequency chopper-stabilisation technique to achieve magnetic stability and to eliminate the offsets normally inherent in single-element devices. The devices incorporate a programmability function to allow for external trimming of the operating point. This feature means that sensor switching performance can be optimised by compensating for variations caused by magnet and device placement tolerances. The output of the A118X family (A1180/2 excepted), will switch 'high' in the presence of a sufficiently large south-pole magnetic field and will switch 'low' with the removal of the field. A1180/2 has the opposite polarity, switching 'low' in the presence of a sufficient magnetic field and 'high' with the removal of the field. It comes in miniature low-profile SMD package and 3-lead ultraminiature single-inline package (SIP) for through-hole mounting and operates over 3,8-24 V.
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