Hall-Effect Bipolar Switch features high-speed chopping circuit.

Press Release Summary:

Operating at temperatures up to +150°C, Model A1250 integrates voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and short-circuit-protected, open-collector output on single silicon chip. On-board regulator permits operation with supply voltages of 3.0-24 V. Available in modified SOT-23W surface mount package or ultra-mini-SIP for through-hole mounting, switch is suited for automotive, industrial, and consumer markets.

Original Press Release:

Allegro MicroSystems, Inc. Announces New General Purpose Bipolar Switch

Offered in Multiple Packages with Improved Switching Repeatability

Worcester, MA- Allegro MicroSystems announces the release of a new bipolar switch designed with a high speed chopping circuit to null out offsets and dramatically improve switching repeatability. Allegro's A1250 is an extremely temperature-stable and stress-resistant Hall-effect, bipolar switch. This device is especially suited for operation over extended temperature ranges to +150°C. Superior high temperature performance is made possible through dynamic offset cancellation, which reduces the residual offset voltage normally resulting from device overmolding, temperature dependencies, and thermal stress. This new device is targeted at the automotive, industrial and consumer markets.

The A1250 design includes on a single silicon chip a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short-circuit-protected, open-collector output. A south pole of sufficient strength will turn the output on. A north pole is necessary to turn the output off.

An on-board regulator permits operation with supply voltages of 3.0 to 24 V. The advantage of operating at 3.0 V is that it can be used in 3 V applications or additional external resistance can be added in series with the supply pin for greater protection in applications that can supply higher voltages.

Two package styles provide a magnetically optimized package for most applications. Package type LH is a modified SOT-23W surface mount package, while the UA package is a three-lead, ultra-mini-SIP for through-hole mounting. Each package type is only available as lead (Pb) free (suffix, -T), with a 100% matte tin plated lead frame.

The pricing stated below is in quantities of 1,000:

o A1250LLHLT-T $0.55

o A1250LLHLX-T $0.54

o A1250LUA-T $0.58

Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance semiconductors. Allegro's innovative solutions serve high-growth applications within the automotive market, with additional focus on office automation, industrial, and consumer/communications solutions. Allegro is headquartered in Worcester, Massachusetts (USA) with design, applications, and sales support centers located worldwide. Further information about Allegro can be found at www.allegromicro.com.

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