Allegro MicroSystems, Inc. Introduces a New Family of Switches and LatchesImproved Switching Repeatability in Multiple Package Options

Worcester, MA ¨C February 12, 2009 ¡ª Allegro® introduces a new family of Hall-effect switches and latches that are extremely temperature-stable and stress-resistant sensors suited for operation over extended temperature ranges to 150¡ãC. Superior high temperature performance is made possible through dynamic offset cancellation, reducing the residual offset voltage normally caused by device over-molding, temperature dependencies, and thermal stress. Allegro¡¯s A1220 and A1221 devices are most commonly used to detect the speed and direction of ring magnets for motor commutation. The A1120 is most commonly used to detect the end position in wiper systems and multiple discrete positions in shift selectors.
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Each device includes on a single silicon chip: a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and short-circuit protected open-collector output that can sink up to 25 mA. An on-board regulator permits operation with supply voltages of 3.0 to 24 V. Significant advantages are realized by reducing the minimum operating voltage. These devices can now be used in 3 V applications and additional external resistance can be added in series with the supply pin for greater protection against transient events. Two package styles provide a magnetically optimized package for most applications. Package type LH is a modified SOT23W, surface mount package, while the UA is a three-lead, ultra-mini-SIP for through-hole mounting. Each package type is available as lead (Pb) free (suffix, -T), with a 100% matte tin-plated lead frame.

About Allegro

Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance power integrated circuits and integrated Hall-effect magnetic sensors. 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.

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