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
ACS37017
High-Accuracy, 750 kHz Current Sensor IC with Reference Output
ACS37200
The ACS37200 is an ultra-compact ±200A integrated current sensor with an 8-pin PSOF package features a low 50 µΩ conductor resistance and 565VRMS reinforced isolation.
ACS37100
Explore how Allegro's ACS37100 is fully integrating TMR current sensor by offering high accuracy and low noise for demanding control loop applications.
Product Selection Guide
Documentation & Resources
Technical Article
Breaking the Density Barrier: A Technical Deep Dive into Simplified SiC Gate Drive
Learn how Power-Thru™ isolated SiC gate drivers eliminate the need for bulky external bias supplies, drastically reducing BOM count and PCB size by up to 50%. Solve EMI and power density challenges in your next high-voltage design.
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.
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.
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
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
Hall Effect Current Sensing in Electric and Hybrid Vehicles
Improved energy efficiency in HEVs and EVs can be attained by using electrically-driven actuators instead of belt-driven and hydraulic actuators. For instance, in traditional internal combustion engines a fan belt drives the cooling fan, which operates continuously while the engine is running.