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High-Performance Power ICs and Hall-Effect Sensors
Allegro MicroSystems, Inc. Introduces New Chopper-Stabilized
Latch
A1242 ideal for motor-speed and direction-sensing applications 
Worcester, MA, September 13, 2005 — Allegro MicroSystems, Inc. announces the A1242, a new chopper-stabilized latch ideally suited for use in motor-speed and direction-sensing applications, as well as in other applications where the sensor is located far from the ECU. This sensor requires one less wire in the wiring harness than the comparable three-wire Hall-effect latch. Additionally, the two-wire feature of this sensor provides inherent short/open detection.
The A1242 is a two-wire, current-output, Hall-effect latch that is ideally suited for use in automotive, industrial and consumer applications. The sensor employs a patented high-frequency chopper-stabilization technique on Allegro's new DABIC5 (Digital Analog BiCMOS) process to achieve magnetic stability over temperature. The A1242 operates accurately and consistently in harsh environments, such as those commonly found in automotive applications. Additionally, the A1242 is designed for flexibility by offering two different output current level options.
This device provides on-chip transient protection, while a zener clamp on the power supply protects against over-voltage conditions on the supply line. The output of this family will switch HIGH in the presence of a sufficiently large south-pole magnetic field and LOW in the presence of a sufficiently large north-pole magnetic field.
Allegro MicroSystems, Inc. is a supplier of advanced mixed-signal power semiconductors and Hall-effect sensors targeted toward the automotive, communications, computer/office automation, consumer and industrial markets. It maintains a leadership position in the integrated magnetic sensor and integrated motor driver product segments. With more than 2,000 employees, Allegro is headquartered in Worcester, MA. Further information about Allegro, including free samples of our products, can be found at www.allegromicro.com.
Editorial Contact:
Stephanie Fennelly
Director – Marketing Communications
Tel: (508) 854-5363
sfennelly@allegromicro.com