Omnipolar Hall-effect switches

6 February 2013 Test & Measurement

Diodes Incorporated has announced four omnipolar Hall-effect switches offering sensitivities to closely match the magnetic field strengths used in proximity and position detection duties in a variety of different product designs.

These micropower devices have also been optimised for battery and low-power operation, typically consuming just 24 μW with a 3 V supply.

Suitable for portable consumer devices as well as industrial products, the high-sensitivity AH1806 and AH1808 are each designed using two Hall-effect plates. With operating thresholds set at ±30 G and ±40 G, the switches enable users to closely control the detection point.

To suit 2,8 V and 3,3 V power rails, the switches’ supply range is specified at 2,5 V to 3,6 V. AH1806 and AH1808 are initially being provided in the SOT553 package, with SC59 (SOT23) versions to follow.

The medium-sensitivity AH1807 and low-sensitivity AH1809 devices provide typical operating points of ±80 G and ±130 G respectively, and are used in applications featuring much stronger field strengths, including smart meters, home appliances and security equipment.

For added flexibility, the latter switches’ supply range is 2,5 V to 5,5 V and operating temperature range is extended, from -40°C to +125°C. There are two package options to choose from: SOT553 and the leaded SIP-3L, with SC59 (SOT23) also following.

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