Hall-Effect Current Sensor has integrated current path.

Press Release Summary:



Available in 15 and 5 A versions, SOICS-packaged Model ACS704 determines bi-directional ac or dc currents by using Hall-effect magnetic sensor to measure field generated by current flow. Because there is no electrical connection between current path and sensing circuit, unit provides minimum of 800 V of isolation without additional components. With 1.5 mohm resistance, sensor operates from single +5 V supply with accuracy exceeding 1.5% at 25°C.



Original Press Release:


Allegro Microsystems, Inc. Launches First SOIC8-Packaged Hall-Effect Current Sensor with Integrated Current Path


Worcester, MA, Jan. 7, 2005 - The newest current sensor family from Allegro MicroSystems, Inc., the ACS704, is the first SOICS-packaged Hall-effect current sensor with the current path integrated into the package for greater sensitivity and accuracy. Available in both 15 A and 5 A versions, it measures bi-directional ac or dc currents by using a Hall-effect magnetic field sensor to measure the field generated by the current flow. Because there is no electrical connection between the current path and sensing circuit, it provides a minimum of 800 volts of isolation without the use of additional components.

Only 1.7 mm high, the ACS704 provides a monolithic solution that is much smaller than other integrated current path Hall-effect sensors with comparable sensitivity, and with greater accuracy, sensitivity, and creepage and clearance distances than "trace-straddling" sensors.

Accuracy at 25°C typically exceeds 1.5%, and the sensor is compliant to lead-free directives. The 1.5 mohm resistance of the sensor provides extremely low power loss and voltage drop. The sensor operates from a single, +5V supply, and the output is ratiometric to the supply voltage.

This new current sensor is targeted to meet the needs of the industrial, consumer, communications and automotive markets. End applications including motor control and protection, small electric vehicles, battery monitoring and charge control, power distribution and monitoring, and personal UPS systems. This newest family is priced at $1.61 in quantities up to 1,000 with a lead time of 8-10 weeks.

Allegro MicroSystems, Inc. is a supplier of advanced mixed-signal power semiconductors and Hall-effect sensors. 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.

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