Sensor ICs

Allegro MicroSystems (Worcester, MA) offers two new current sensor ICs for AC or DC current sensing. Both the ACS724KMA (5 V) and the ACS725KMA (3.3 V) are set in a high-isolation SOIC16 wide-body surface mount package that provides reinforced isolation. The differential sensing technology protects against interfering common-mode magnetic fields from adjacent current traces or motors. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection.

Both devices consist of a low-offset, linear Hall sensor circuit, with a copper conduction path located near the surface of the die. Applied current flowing through the copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. The current is sensed differentially in order to reject common-mode fields, improving accuracy in magnetically noisy environments. Leadframes are plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes.

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