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High-Performance Power ICs and Hall-Effect Sensors
Allegro MicroSystems, Inc. Introduces a Family of
Linear Hall-Effect Sensors for High Temperature Operation 
Worcester, MA — May 21, 2004 — Allegro MicroSystems, Inc. introduces the world's first family of linear sensors in a SOT23 package rated for operation to 150°C. Allegro's new family of parts consists of optimized, sensitive, temperature-stable linear devices with greatly improved offset characteristics. These ratiometric Hall-effect sensors provide a voltage output that is proportional to the applied magnetic field. These parts have a quiescent output voltage that is 50% of the supply voltage and output sensitivity options of nominally 2.5mV/G, 3.125mV/G, and 5mV/G. The features of this linear family are ideal for use in linear and rotary position sensing systems in harsh environments of automotive and industrial applications over extended temperatures to -40°C and +150°C.
Each BiCMOS monolithic circuit integrates a Hall element, improved temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the Hall element, a small-signal high-gain amplifier, and a rail-to-rail low-impedance output stage. After package programming allows the device sensitivity and quiescent output voltage to be tightly controlled at room temperature.
A proprietary dynamic offset cancellation technique, with an internal high frequency clock, reduces the residual offset voltage, which is normally caused by device over molding, temperature dependencies, and thermal stress. The high frequency clock allows for a greater sampling, which produces higher accuracy and faster signal processing capability. This technique produces devices that have an extremely stable quiescent output voltage, are immune to mechanical stress, and have precise recoverability after temperature cycling. Having the Hall element and an amplifier on a single chip minimizes many problems normally associated with low-level analog signals. Output precision is obtained by internal gain and offset trim adjustments made at end-of-line during the manufacturing process.
The A132x family is provided in a 3-pin single in-line package (UA) and a 3-pin surface mount package (LH).
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 over 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