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Hall-effect sensors for harsh environments

Hall-effect sensors for harsh environments

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By Christoph Hammerschmidt



These are intended as a replacement for reed and mechanical microswitches and can operate from an average supply current of 6microamps.

These monolithic devices include either a standard Hall plate or a vertical Hall plate, a small-signal amplifier, chopper stabilisation, a Schmitt trigger, automatic power management controller, and an NMOS output transistor. The APS11700 uses a standard planar Hall-effect sensing element, while the APS11760 implements AVHT technology in the form of a silicon-based vertical Hall-effect sensing element. The APS11760 devices are therefore sensitive to magnetic flux parallel to the face of the IC package, mimicking the in-plane sensitivity of common reed switches.

These ICs are qualified to AEC-Q100 Grade 0 and compliant with ISO 26262:2011 ASIL A when properly applied, making them suitable for automotive and other safety systems. They can tolerate up to 40V and junction temperature up to 165°C.  In addition, they are internally protected against overvoltage, reverse-battery, load-dump, output short-circuits, human-body-model ESD up to ±11kV, and other EMC conditions.

Two package styles are available; Allegro’s LH package 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. Both packages are lead (Pb) free, with 100% matt-tin leadframe plating. 

Related links and articles:

www.allegromicro.com

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