Allegro MicroSystems, LLC have  introduced their first fully integrated, GMR-based current sensor  IC,  ACS70331. With ultra-high sensitivity, the new sensors are best fit for applications that require <5 A current sensing.
Incorporating giant magneto-resistive (GMR) technology, Allegro’s ACS70331 current sensor IC is 25 times more sensitive than traditional Hall-effect sensor ICs. They are capable to sense the magnetic field generated by the current flowing through the low resistance, integrated primary conductor.
This new device has been designed to sense very small currents with 1 mA resolution in a very low series resistance package of only 1 mOhm. The ACS70331 is offered in four factory-programmed sensitivity and offset levels to optimize performance over the desired current measurement range. As a result,  they are ideal for handheld and laptop adaptor chargers, radios and walkie talkies, IoT load detection, small surveillance and other motor control applications.
Other USPs of ACS70331 include it’s analog output that provides a low noise high-speed signal, which is proportional to the current flowing through the primary conductor. The full scale bandwidth is 1 MHz and the response time of the device is typically 535 ns.
Allegro’s ACS70331 current sensor IC operates from a single 3.3 V power supply while it can withstand full commercial temperature range of –40°C to 85°C. It is offered in a low-profile space-saving surface mount QFN package. It is priced at $0.53 in quantities of 1,000.

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