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Allegro MicroSystems, Inc. Offers the First Programmable
Unipolar Hall-Effect Switch
Extremely Temperature Stable and Stress Resistant Switches for Automotive
and Industrial Applications 
Worcester, MA, October 2, 2001 - Allegro MicroSystems, Inc. announces the release of the first family of programmable unipolar Hall-effect switches. These devices are one-time externally programmable over a wide magnetic operating range. The feature of external programming allows the user to optimize the magnetic switch points in order to reduce the effects of offsets which can be caused by package and magnet placement tolerances. Programming hardware can be purchased through Allegro, or programming software and hardware schematics are available on the Allegro website.
Allegro's A3250 and A3251 are ideal for both automotive and industrial proximity sensing applications that require tight part-to-part distribution. A very tight distribution can be obtained because the user is able to program the switch point. Both devices are equipped with on-chip protection for supply transients, output short-circuiting and reverse battery. Due to Allegro's patented chopper-stabilization technique, these switches are extremely temperature stable (low switch point drift over temperature) and stress resistant. The A3250 and A3251 differ from each other only in output polarity; the A3250 output current goes low in the presence of a south pole of sufficient strength; the A3251 output current goes high.
Allegro's programmable A3250 and A3251 Hall-effect switches are currently available in the 3-lead single in-line package (UA package) and are offered in two operating temperature ranges, 'J' = -40°C to +115°C and 'L' = -40°C to +150°C.
About Allegro
Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance power and Hall-effect sensor integrated circuits. Allegro's innovative solutions serve high-growth applications within the automotive, communications, computer/office automation, consumer and industrial markets. Allegro is headquartered in Worcester, Massachusetts (USA) with design and applications centers located in North and South America, Asia, and Europe. Further information about Allegro can be found at www.allegromicro.com.
Editorial Contact:
Stephanie Fennelly
Director - Marketing Communications
Tel: (508) 854-5363
sfennelly@allegromicro.com