Integrated Current Sensors
Our integrated current sensors combine precision measurement with built-in isolation for compact, high-efficiency designs. By replacing bulky shunt and amplifier setups, they simplify layouts, reduce heat, and enhance safety across automotive and industrial applications.
Featured Products
ACS37100
Explore how Allegro's ACS37100 is fully integrating TMR current sensor by offering high accuracy and low noise for demanding control loop applications.
ACS37002
400 kHz, High Accuracy Current Sensor with Pin-Selectable Gains
ACS71240
Automotive-Grade, Galvanically Isolated Current Sensor IC
ACS37800
Programmable AC and DC Power Monitoring IC
Product Selection Guide
Documentation & Resources
Technical Article
New 400 kHz Current Sensors Enable More Sustainable Designs in Switch-Mode Power Designs
Really Cool. Really Efficient. New 400 kHz current sensors enable more sustainable designs in switch-mode power designs.
Technical Article
Solar Energy Systems – New Market Trends in Current Sensing
P0103 - As solar installations grow larger and more ambitious by the day, new trends in current sensing are emerging for this expanding energy market.
Application Note
An Effective Method for Characterizing System Bandwidth in Complex Current Sensor Applications
This application note describes multiple methods for measuring
and characterizing system bandwidth, with a focus on
the impulse response method. Allegro’s ACS720 is the perfect device to validate the test methods outlined here.
Application Note
Achieving Closed-Loop Accuracy in Open-Loop Current Sensors
Closed-loop current sensing technology is employed in many industrial and automotive applications for accurate current sensing. Allegro MicroSystems has developed magnetic-based current sensor IC solutions that achieve near closed-loop accuracy using an open-loop topology.
Technical Article
Magnetic Current Sensing Drives Vehicle Electrification
Modern cars have become increasingly power hungry. Even the “least electrified” vehicles include advanced electronics for infotainment, safety, and engine control. Fully electric vehicles further add high-voltage power domains to charge and drive. Each of these systems shares the need for power monitoring and control, and this is where current sensors are used.
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
Increased Electric Motor Content in HEV Subsystems Require Current Sensing
To control the drive train in HEV and full EV vehicles, it is well-known that current sensing is required particularly in starter generator and main electric drive motor generator applications.
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
DC and Transient Current Capability/Fuse Characteristics of Surface Mount Current Sensor ICs
AN269122 - Allegro Microsystems offers a broad product family of current sensor IC solutions with integrated conductors. For applications with normal operating currents up to 50 A, Allegro offers current sensor ICs in a number of standard surface-mount packages, such as SOIC-8, SOICW-16, QSOP-24, and QFN1.
Application Note
Common Mode Field Rejection in Coreless Hall-Effect Current Sensor ICs
Allegro current sensor ICs use the Hall-effect to measure the magnetic field produced by an integrated, current-carrying loop, translating the magnetic field to a voltage which is proportional to the current flow.
Application Note
Techniques to Minimize Common-Mode Field Interference When Using Allegro Current Sensor ICs (ACS724 and ACS780)
This application note will discuss the mechanism of CMR and focus on how to best use this mechanism through optimized circuit board design and layout for sensors that need an external magnetic core, sensors that have a core built into the package, and sensors that have an integrated current-carrying loop but no core.
Application Note
Shifting the Offset Voltage of Current Sensors
Most of the Allegro™ unidirectional current sensor ICs are trimmed such that the zero ampere output is at 0.1 × VCC . The advantage of having the output voltage at 0.1 × VCC is that the output can swing slightly lower than this value before saturating.
Application Note
Recent Trends in Hall-Effect Current Sensing
This paper presents recent advances in integrated Hall-effect–based current sensor ICs. It covers the various packaging concepts for integrating the primary current path into the system, the major improvements in IC parameters.
Application Note
Differential Current Sensing with the 1 MHz Bandwidth ACS733
AN296154 - This application note describes the use of the new highly isolated, high bandwidth ACS733 Hall-effect current sensor integrated circuit (IC) from Allegro MicroSystems and gives an overview of its features and advantages over a highspeed current transformer (CT) current sensing solution.