Product Overview

The Allegro ACS70331 is a high-sensitivity, 1 MHz GMR-based current sensor IC designed for <5 A current sensing applications. Leveraging Giant Magneto-Resistive (GMR) technology, it offers 25 times greater sensitivity than traditional Hall-effect sensors, enabling precise measurement of magnetic fields generated by current through its integrated low-resistance primary conductor. The sensor provides a low-noise, high-speed analog output proportional to the sensed current, with a typical response time of 535 ns. It is offered in four factory-programmed sensitivity and offset levels to optimize performance across various current measurement ranges. The differential GMR element configuration ensures high rejection of stray magnetic fields for stable operation in noisy environments. The ACS70331 operates from a single 3.3 V supply and is available in space-saving QFN-12 and SOIC-8 surface-mount packages, qualified for the commercial temperature range of 40C to 85C.

Product Attributes

• Brand: Allegro MicroSystems
• Technology: Giant Magneto-Resistive (GMR)

Technical Specifications

Key Features

• 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 m primary conductor resistance (QFN-12) results in low power loss
• Small surface mount QFN-12 and SOIC-8 packages for space-constrained applications

Application Scenarios

• Current sensing applications up to 5 A

Important Note

The ACS70331 has been determined to be NOT FOR NEW DESIGN. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available.