Current sensors improve design efficiency

Allegro’s two new magnetic current sensors enhance system efficiency and protection compared to discrete shunt-based current sensing circuits. The ACS37220 measures current up to 200 A, while the ACS37041 measures current up to 30 A. Both Hall effect sensors are designed for applications with isolation voltage requirements below 100 V. Additionally, the ACS37041 is anticipated to be the industry’s smallest leaded magnetic current sensor.

Existing shunt solutions need multiple components, occupy significant board space, and often require extra PCB layers and heatsinks to maintain thermal performance, adding weight, size, and design complexity. The ACS37220 and ACS37041 address these challenges by providing a smaller footprint, higher efficiency, and simpler integration.

The current sensors integrate the functions of a shunt resistor, shunt amplifier, and other passive components into a single, compact package. Housed in a 4×4-mm QFN package, the ACS37220 has low internal conductor resistance of 0.1 mΩ, ensuring minimal power loss and enabling it to withstand high inrush currents. The ACS37041, with a higher conductor resistance of >1 mΩ, fits into a compact 5-pin SOT23-W package.

The ACS37220 current sensor is available now through Allegro’s distributor network. Engineering samples of the ACS37041 pre-release sensor are available upon request.

ACS37220 product page 

ACS37041 product page 

Allegro Microsystems 

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