Programmable two-wire, unipolar Hall-effect switches: 3 package options

October 18, 2016 // By Julien Happich
Allegro MicroSystems Europe has announced a new package option for its A119x/A119x-F (A1190, A1192, and A1193) family of two-wire, unipolar, Hall-effect switches, which can be trimmed by the user at end-of-line to optimise magnetic switch-point accuracy in the application.

The A119x and A119x-F are produced on the Allegro advanced BiCMOS wafer fabrication process, which implements a patented high-frequency, 4-phase, chopper stabilisation technique. This technique achieves magnetic stability over the full operating temperature range, and eliminates offsets inherent in devices with a single Hall element that are exposed to harsh application environments.

This new package option eliminates the need for an external capacitor and the associated PCB, saving size, component-count, and assembly cost and significantly simplifying the design process.  The latter (-F option) devices are temperature compensated for use with ferrite magnets.

The A119x and A119x-F family was developed for use in automotive and industrial applications that value safety or involve long sensor wiring harnesses. These include sensing seat track position, seat belt buckle presence, hood/trunk latching, and shift selector position.

All family members 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 3-pin, ultra-mini, single inline package (SIP) for through-hole mounting. The UB is a 2-pin, ultra-mini, single inline package (SIP) with an integrated capacitor for through-hole mounting or welding directly to connector pins, eliminating the PCB entirely. All three packages are lead (Pb) free, with 100% matt-tin leadframe plating.

Visit Allegro MicroSystems at