A1250 Hall-Effect Latch / Bipolar Switch Data sheet
●DESCRIPTION
■The A1250 Hall-effect sensor IC is a temperature-stable, stress-resistant bipolar switch. This device is the most sensitive Hall-effect device in the Allegro™ bipolar switch family and is intended for ring-magnet sensing. Superior high-temperature performance is made possible through an Allegro dynamic offset cancellation that utilizes chopper stabilization. This method reduces the offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress.
■The A1250 includes the following on a single silicon chip: a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short-circuit-protected open-drain output. Advanced BiCMOS wafer fabrication processing takes advantage of low-voltage requirements, component matching, very low input-offset errors, and small component geometries.
■The A1250 Hall-effect bipolar switch turns on in a south polarity magnetic field of sufficient strength and switches off in a north polarity magnetic field of sufficient strength. Because the output state is not defined if the magnetic field is diminished or removed, to ensure that the device switches, Allegro recommends using magnets of both polarities and of sufficient strength in the application.
■The A1250 is rated for operation in the ambient temperature range L, –40°C to 150°C. Two package styles provide magnetically optimized solutions for most applications. Each package is lead (Pb) free version, with 100% matte-tin-plated leadframe.
●FEATURES AND BENEFITS
■AEC-Q100 automotive qualified
■Quality managed (QM), ISO 26262:2011 compliant
■High-speed 4-phase chopper stabilization
■Low operating voltage down to 3 V
■High sensitivity
■Stable switchpoints
■Robust EMC
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Hall-Effect Latch 、 Bipolar Switch 、 temperature-stable, stress-resistant bipolar switch 、 Hall-effect device |
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[ automotive ] |
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Datasheet |
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Please see the document for details |
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SOT23W;SIP |
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English Chinese Chinese and English Japanese |
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October 12, 2018 |
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Rev. 6 |
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A1250-DS |
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1.1 MB |
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