Hall-Effect Current Sensor provides low thermal drift.

Press Release Summary:



Open-loop, ±50 A Model ACS750(S/L)CA-050 features two primary leads that are electrically isolated from sensing circuitry. Leads allow current to pass through ferrite core and past sensing element of Hall IC. Monolithic sensor provides low power loss, as internal resistance is only 130 µohm. It is suited for power distribution and management, motor control, welding and plasma cutting systems, and UPS and emergency lighting applications.



Original Press Release:


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


Simplify Manufacturing with a Precise and Economical Solution for Current Sensing

Worcester, MA, October 16, 2003 - Allegro MicroSystems, Inc. announces a fully integrated ±50 A isolated current sensor, 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 sensors. 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.

Part Number        Measurement Range       Temperature Range
ACS75OLCA-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
ACS750ECA-100 up to ±100 A -40°C to +85°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 µohm. 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 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. This new sensor is supplied in a "CA" package, and will have an 8-10 week lead time to market. The 'L' version of the device (-40 to 150°C) is priced at $5.20 in quantities of 10,000. The 'S' version (-20 to 85°C) is priced at $5.15 in the same quantity.

About Allegro MicroSystems, Inc.

Allegro MicroSystems, Inc. is a global supplier of advanced mixed-signal power semiconductors and Hall-effect sensors targeted toward the office automation, automotive, industrial, and portable electronics markets. With over 2,000 employees, Allegro is headquartered in Worcester, MA. Further information on Allegro can be found at www.allegromicro.com.

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