Allegro MicroSystems, Inc. Introduces a Fully Integrated ±50 A Isolated Current Sensor

Worcester, MA, October 16, 2003 — Allegro MicroSystems, Inc. announces a fully integrated ±50 A isolated current sensor IC, the ACS750(S/L)CA-050. This device joins the 75 A ACS750(S/L)CA-075 and 100 A ACS750(S/E)CA-100 in Allegro's expanding family of revolutionary open-loop Hall-effect-based current sensor ICs. The use of a programmable linear Hall-effect device provides accuracy and linearity as well as very low thermal drift. The small electromechanical package is an innovative step toward a fully integrated current sensing solution. Customers no longer need to design and manufacture their own magnetic circuit. Two primary leads allow current to pass through a ferrite core and past the sensing element of a Hall IC. It requires minimal effort to implement on a PC board in a high-volume production environment by means of soldering or welding. The device provides customers with a small, precise and economical solution for current sensing.

Allegro's Family of Hall-Effect Current Sensors

Part Number	Measurement Range	Temperature Range
ACS750LCA-050	up to ±50 A	-40°C to +150°C
ACS750SCA-050	up to ±50 A	-20°C to +85°C
ACS750LCA-075	up to ±75 A	-40°C to +150°C
ACS750SCA-075	up to ±75 A	-20°C to +85°C
ACS750LCA-100	up to ±100 A	-40°C to +150°C
ACS750SCA-100	up to ±100 A	-20°C to +85°C

The monolithic ACS750(S/L)CA-050 provides extremely high reliability and extremely low power loss, as the internal resistance is only 130 micro-ohms. The power leads are electrically isolated (2.5 kV) from the sensing circuitry. This allows use of the device in applications where isolation is a requirement, without the added expense of opto-isolators or other costly isolating techniques.

This new current sensor IC is targeted to meet the needs of the industrial, commercial and automotive markets with end applications to include power distribution and management, motor control, welding and plasma cutting systems, UPS and emergency lighting, and heating systems.

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