High Sensitivity, 1 MHz, GMR-Based Current Sensor IC in Space-Saving Low Resistance QFN and SOIC packages




Top Features


The ACS70331 is Allegro's first integrated, high sensitivity, current sensor IC for <5 A current sensing applications. It incorporates 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.

The analog output provides a low noise high-speed signal, which is proportional to the current flowing through the primary. The response time of the part is typically 535 ns. The ACS70331 is offered in four factory-programmed sensitivity and offset levels to optimize performance over the desired current measurement range.

The differential configuration of the GMR elements, relative to the integrated current conductor, provides significant rejection of stray magnetic fields, resulting in stable operation even in magnetically noisy environments.

The ACS70331 operates from a single 3.3 V power supply and is qualified over the full commercial temperature range of –40°C to 85°C. It is offered in a low-profile space-saving surface mount QFN and SOIC packages.

  • High sensitivity current sensor IC for sensing up to 5 A (DC or AC)
  • 1 MHz bandwidth with response time <550 ns
  • Low noise: 8 mA(rms) at 1 MHz
  • Non-ratiometric, analog output proportional to AC and DC current
  • Single 3.3 V supply operation
  • High DC PSRR enables use with low accuracy power supplies or batteries (3 to 4.5 V operation)
  • 1.1 mΩ primary conductor resistance results in low power loss
  • Small surface mount QFN-12 and SOIC-8 packages for space-constrained applications

The ACS70331 is available in small surface mount QFN-12, (suffix ES) and SOIC-8, (suffix OL) packages for space-constrained applications.

ES Package Documentation

OL Package Documentation

Part Number Specifications and Availability

Documentation and Resources


Design Tools

Third Party Design Tools

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Mikroe Demoboards

PWR Meter 3 Demo Board

The Hall Current 4 click is designed to measure relatively high current by using the integrated ACS70331 sensor. The current sensor is based on the GMR elements for current measurement.

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