Worcester, Mass. Allegro MicroSystems, Inc. claims its new A3245 sensor is the industry's first omnipolar Hall-effect device suited for 3.6 V to 24 V operation. It also offers a high operating temperature range of -40°C to 150°C. The omnipolar feature allows the new digital switch to easily replace reed switches with higher reliability and ease of manufacturing, and eliminates the need for signal conditioning. It also eliminates the need for magnet orientation for simple position sensing applications during manufacturing.
The single-chip A3245 includes a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short-circuit-protected open-collector output. Targeting consumer, computer/office, industrial and automotive applications, advanced BiCMOS wafer fabrication processing is used to take advantage of low-voltage requirements, component matching, very low input-offset errors, and small component geometries.
The company said the device's high-temperature performance is made possible through Allegro-patented dynamic offset cancellation, which reduces the residual offset voltage typically caused by device over-molding, temperature dependencies and thermal stress. The omnipolar feature allows operation with either a north or a south pole of sufficient strength. In the absence of a magnetic field, the output is off. For more technical information, see the A3245 datasheet.
Available in a three-pin single in-line package (UA) and a three-pin surface-mount package (LH), the A3245 is priced at $0.41 for the "E" temperature range (-40°C to 85°C), and $0.52 for the "L" temperature range (-40°C to 150°C). Each package is available in a lead-free version, with 100% matte tin-plated leadframes. Delivery for both packages is six to eight weeks.
Allegro MicroSystems Inc., 1-508-853-5000,www.allegromicro.com