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Two-wire unipolar Hall-effect switch family has package option

According to the company, it eliminates the need for an external capacitor and the associated PCB. This reduces size, saves component count and assembly cost and significantly simplifying the design process.

The A1152, A1153, A1156, and A1157 devices, are factory-trimmed to optimise magnetic switch-point accuracy. Devices are distinguished by the choice of magnetic switch-points, output current, output polarity, and package.

The company’s BiCMOS wafer fabrication process uses a patented high-frequency four-phase chopper-stabilisation technique to achieve magnetic stability over the full operating temperature range. It is also claimed to eliminate offsets inherent in devices with a single Hall element that are exposed to harsh application environments.

The sensors were developed for use in automotive and industrial applications that are safety-critical or involve long sensor wiring harnesses. Typical applications include seat track position sensing, seat-belt buckle presence, hood/trunk latching, and shift selector position sensing.

Two-wire switches require one less wire for operation than the more traditional open-collector output switches to save space, weight and cost. It also offers diagnostic capabilities because there is always output current flowing in either of two narrow ranges. A current level not within these ranges indicates a fault condition.

All members of the family are offered in three package styles. The LH is a SOT-23W style miniature low-profile package for surface-mount applications. The UA is a three-pin ultra-miniature single inline package for through-hole mounting. The UB is a two-pin ultra-miniature single inline package with an integrated capacitor for through-hole mounting or for welding directly to connector pins, eliminating the PCB entirely. All three packages are RoHS-compliant, with 100% matt tin lead frame plating.

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