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Current Sensors

We’ve been driving innovation in the current sensor industry since 2002, with a history of first-to-market products that give our customers a competitive edge. Our advanced ICs help you achieve higher efficiency and power density in your designs. Our fully integrated solutions make design-in easy.

We're leading the market in main traction motor and auxiliary inverters for electric vehicles, and OEMs trust us for applications like DC-to-DC converters and on-board chargers.

We also shine at high voltage with industry-leading isolation ratings of up to 1100 Vrms—ideal for residential and industrial solar inverter applications.

Features and Innovations

DC Working Voltage

Our packages have the highest working voltages in SOIC-16 footprint

Overcurrent Detection

Our current sensors include fast overcurrent detection in addition to a precision analog output.

High Speed sensors replace bulky current transformers

High speed integrated sensors are the smart alternative to bulky current transformers (CTs).

Current Sensors Innovations

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Portfolios
Featured Products
Technical Documentation
Design and Development
Videos

Portfolios

0 to 50 A Integrated Current Sensor ICs

Our family of fully integrated, high isolation current sensor solutions provides accurate measurement with very low resistance—all without the need for external isolation components.

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0 to 400 A Integrated Current Sensor ICs

Our high current sensor IC packages are fully integrated solutions that also provide high accuracy and reliability. These sensors are automotive-grade devices that can take the heat and deliver highly accurate open-loop current sensing in the harshest applications environments.

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Field Sensors 0 to >1000 A Sensor ICs

Customer-programmable for both offset and sensitivity, these Hall linear ICs are packaged in a 1 mm thick KT package SIP that is often used in applications with a ferromagnetic core and are designed to sense currents above 1500 A.

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Featured Products

ACS37002

400 kHz, High Accuracy Current Sensor with Pin-Selectable Gains

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ACS37800

Programmable AC and DC Power Monitoring IC

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ACS37612

Standalone Coreless Differential Current Sensor IC

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Technical Articles

Rethink PCB Current Sensing »

New 400 kHz Current Sensors Enable More Sustainable Designs in Switch-Mode Power Designs »

Selection & Solution Guides

Allegro Product Selection Guide

Frequently Asked Questions

Current Sensor FAQ »

Application Notes

Techniques for Mitigating Interference While Measuring High Frequency, High Current Transient Responses

An Effective Method for Characterizing System Bandwidth in Complex Current Sensor Applications »

DC Current Capability and Fuse Characteristics of Current Sensor ICs with 50 to 200 A Measurement Capability »

Secrets of Measuring Currents Above 50 Amps »

Current Sensor Thermals: Unique Packaging Options for Every Thermal Budget

Design and Development

Coreless Current Sensor Busbar Calculator »

Coreless PCB Calculator (ZIP)

ACS LTspice Library (ZIP)

Design and Development

Coreless Current Sensor Busbar Calculator »

Coreless PCB Calculator (ZIP)

ACS LTspice Library (ZIP)

Allegro's Coreless Current Sensor Solutions

Published June 01, 2021

The ACS3761X Hall-effect sensor IC solution family is a coreless and shield-free solution, reducing BOM and overall inverter size and weight. These differential sensors reject stray magnetic fields, reducing reliance on software. The family is optimized for a large range of currents, 100 A to >4000 A, making it ideal for automotive applications. Watch Video

Rejecting stray magnetic fields in Hall-effect-based current sensors using the ACS724

Published August 24, 2020

Watch video explaining and demonstrating a method for rejecting stray magnetic fields in Hall-effect-based current sensors using the ACS724. This technology solves interference and cross-talk issues, greatly simplifying the use of magnetic current sensors in magnetically noisy environments, such as motor control, solenoid drivers, etc. Watch Video

ACS780 & ACS781: High Current Density Fully Integrated Current Sensor ICs

Published February 01, 2020

Allegro’s new family of fully integrated current sensor linear ICs in a new core-less package designed to sense AC and DC currents up to 100 A. ACS780-ACS781-Video

ACS712 Low-Noise 2100 VRMS Hall-Effect Current Sensor IC

Published January 23, 2020

The Allegro ACS712 provides economical and precise solutions for AC or DC current sensing in industrial, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. Watch Video