Current Sensors
Precision current sensing for efficient, high-voltage designs.
Allegro’s current sensors deliver galvanic isolation, lossless operation, and high-precision accuracy—enabling maximum efficiency and power density in compact systems. Designed for EV traction and auxiliary inverters, DC-DC converters, on-board chargers, solar inverters, and industrial power systems, our solutions offer isolation ratings up to 5 kVRMS, ultra-low conductor resistance down to 0.1 milliohms, and bandwidths up to 5 MHz for GaN/SiC power electronics.
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Field Current Sensors
Achieve unparalleled accuracy in current sensing with our field current sensors, designed for robust performance with stray field immunity and advanced diagnostics in demanding automotive and industrial applications.
Integrated Current Sensors
Our integrated current sensors combine precision measurement with built-in isolation for compact, high-efficiency designs.
Documentation & Resources
Blog
Magnetic Sensors are a Great Alternative to Traditional Shunt Resistors for Industrial Current Sensing
Magnetic sensors have entered the market, bringing a whole new level of performance, safety, and reliability to the table, much like what Allegro is doing with our current sensor portfolio. So, what makes them so special? Let's discuss.
Application Note
PCB Ground Plane Optimization for Coreless Current Sensor Applications
AN296277 - This application note provides guidelines on how a PCB ground plane around the sensor location should be designed to achieve optimum performances.
Application Note
New Approaches to High-Efficiency Current Sensing: Integrated Hall Sensor ICs Save Power and Space
AN296100: Allegro current sensor ICs allow design engineers to use Hall-effect based current sensor ICs in new applications where increased energy efficiency or new operating features are required. Wherever current sensing is needed, an integrated Hall-effect IC can provide a solution.
Application Note
Current Sensing for Power Delivery
AN296256 - This article will discuss the advantages of various current sensing methods in power delivery.
Video
ACS780 & ACS781: High Current Density Fully Integrated Current Sensor ICs
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.
Video
ACS712 Low-Noise 2100 VRMS Hall-Effect Current Sensor IC
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.
Application Note
Improved Performance and Features of Allegro’s Next Generation, High Power Density CB Package Current Sensors
This application note will describe the use of the new high current ACS772 Hall-effect current sensor integrated circuit (IC) from Allegro MicroSystems and will give an overview
of its features and improvements from previous Allegro high-current sensors.
Application Note
Improving Efficiency in Smart Grid Applications With Fully Integrated Current Sensing ICs
With increasing concerns about the global demand for energy and environmental awareness, power electronics applications are under pressure to improve efficiency.
Technical Article
Hall Effect Current Sensing in Hybrid Electric Vehicle (HEV) Applications
This note provides an understanding of hybrid electric vehicle (HEV) power systems and the contribution Hall-effect sensing technology can provide to improving the performance and cost-effectiveness of these systems.
Application Note
Secrets of Measuring Currents Above 50 Amps
It can be challenging to sense currents exceeding 50 A because the task often involves thermal management, must take place in a limited PCB area, and in some cases, requires a voltage isolation device. Two widely used methods for sensing high currents are a sense-resistor/op-amp approach, and Hall-based current sensing.
Video
ACS711 - Hall Effect Linear Current Sensor
ACS711 provides economical and precise solutions for AC or DC current sensing in 100+ V audio, communications systems, clean energy, personal mobility and white goods. The device package allows for easy implementation by the customer.
Video
XtremeSense™ TMR Technology
Allegro MicroSystems empowers engineers to deliver top-tier solutions with XtremeSense™ TMR technology, enabling industry-leading precision and cost efficiency in current and position sensors.
Guide
Using the ASEK-20 with the ACS37610 Daughterboard and ACS37610 Samples Programmer
This section of the ASEK37610 user guide documents the use of the ACS37610 daughterboard and the ASEK-20 (Part #85- 0540-004) with the Allegro ACS37610 samples programmer.
Application Note
AN296301 - Comparing Parameters of Shunt-Based and Hall-Based Current Sensors
While various methods use the Hall effect to measure current— such as integrated conductor, core-based field sensing, or coreless field sensing—this application note focuses on Allegro integrated conductor Hall-effect current sensors.
Application Note
Noise Characteristics and Measurement Methodology for TMR and Hall-Effect Current Sensors
AN296360 - This application note provides a comprehensive guide to compare noise characteristics of TMR and Hall-effect current sensors.