High-sensitivity Current Sensor Chip For <5A Sensing


Allegro has rolled out its first integrated, high sensitivity, current sensor chip for <5 A current sensing applications. Key applications include handheld and laptop adaptor chargers, radios and walkie talkies, IoT load detection, small surveillance and other motor control applications.

“The chip utilises giant magneto-resistive (GMR) technology that is 25 times more sensitive than traditional Hall-effect sensors to sense the magnetic field generated by the current flowing through the low resistance, integrated primary conductor”, according to Allegro.

The ACS70331 has been designed to sense very small currents with 1mA resolution in a very low series resistance package of only 1 mΩ.


The full-scale bandwidth is 1MHz and the response time of the device is typically 535ns. The sensor offers stable operation even in magnetically noisy environments.

The chip is offered in four factory-programmed sensitivity and offset levels to optimize performance over the desired current measurement range.

The sensor operates from a single 3.3 V power supply. It is specified for full commercial temperature range of –40°C to 85°C.

The ACS70331 is offered in a low-profile space-saving surface mount QFN package measuring 3 mm x 3 mm.

More information: https://www.allegromicro.com/en/Products/Current-Sensor-ICs/Zero-To-Fifty-Amp-Integrated-Conductor-Sensor-ICs/ACS70331.aspx

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