Allegro MicroSystems, Inc. Introduces a New Addition to Their Family of Switches and Latches

Allegro MicroSystems, Inc. Introduces a New Addition to Their Family of Switches and Latches
Improved Switching Repeatability in Multiple Package Options

Worcester, MA ¨C September 10, 2009 ¡ª Allegro® introduces a new addition to their family of Hall-effect switches and latches. The A1222 is an extremely temperature-stable and stress-resistant sensor IC 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 new A1222 device is most commonly used to detect the speed and direction of ring magnets for motor commutation.

Allegro¡¯s A1222 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. This device can 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.