Current Sensor Family Births Two New Members

Allegro MicroSystems adds the ACS732 and ACS733 current sensor ICs to its existing family of devices. The devices provide a compact, fast, and accurate solution for measuring high-frequency currents in dc/dc converters and other switching power applications. They are the first 1-Mhz offerings from the company to offer 3.6 kVrms galvanic isolation ratings. They are Hall-effect-based and include user-configurable overcurrent fault detection. These features make them ideally suited for high-frequency transformer and current transformer replacement in applications running at high voltages.


The ACS732 and ACS733 are suitable for all markets, including automotive, industrial, commercial, and communications systems. They may be used in motor control, load detection and management, switch-mode power supplies, and overcurrent fault protection applications. The devices are fully calibrated at the Allegro factory to provide a high accuracy solution over the entire operating temperature range.


The fully integrated wide body SOIC-16 package has a typical resistance of 1 mΩ, providing low power loss and reduced bill of materials that allows for easy implementation. Applied current flowing through the copper conduction path generates a magnetic field that is sensed by the IC and converted to a proportional voltage. Current is sensed differentially to reject external common-mode fields. The current-carrying pins (pins 1 through 8) are electrically isolated from the sensor leads (pins 9 through 16). This allows the devices to be used in high-side current sensing applications without the use of high-side differential amplifiers, isolators, or other costly isolation techniques.


The ACS732 and ACS733 are available in surface-mount SOIC-16 wide-body packages. Pricing for either device is $1.96 each/1,000. An ACS732 and ACS733 datasheet is also available.

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