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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