ACS724MA: High-Accuracy, Hall-Effect-Based Current Sensor IC with Common-Mode Field Rejection in Reinforced-Isolation SOICW-16 Package

The Allegro™ ACS724MA current sensor IC is an economical and precise solution for AC or DC current sensing in automotive, industrial, commercial, and communication systems. The small surface mount SOICW-16 MA package is ideal for space-constrained applications while offering reinforced isolation. Typical applications include On-Board Chargers (OBC), DC/DC Converters, motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection.

The automotive variant, ACS724LMA, is offered in the “L” temperature range (–40°C to 150°C) while the industrial variant, ACS724KMA, is offered in the “K” temperature range (–40°C to 125°C).

The device consists of a precise, low-offset, linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. The current is sensed differentially in order to reject common-mode fields, improving accuracy in magnetically noisy environments. The inherent device accuracy is optimized through the close proximity of the magnetic field to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which includes Allegro’s patented digital temperature compensation, resulting in extremely accurate performance over temperature. The output of the device has a positive slope when an increasing current flows through the primary copper conduction path (from pins 1 through 4, to pins 5 through 8), which is the path used for current sensing. The internal resistance of this conductive path is 0.85 mΩ typical, providing low power loss.

The terminals of the conductive path are electrically isolated from the sensor leads (pins 9 through 16). This allows the ACS724KMA current sensor IC to be used in high-side current sense applications without the use of high-side differential amplifiers or other costly isolation techniques.

The ACS724MA is provided in a low-profile surface-mount SOICW-16 package. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the device is Pb-free. The device is fully calibrated prior to shipment from the factory.


Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
700 Veterans Memorial Hwy
Suite 310
Hauppauge, NY 11788
Phone: (631)422-2500
Fax: (631)422-2504

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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • Automotive Qualified per AEC-Q100 (“L” temperature variant only)
  • Differential Hall sensing rejects common-mode fields
  • Patented integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an open loop sensor
  • UL60950-1 (ed. 2) certified
    • Dielectric Strength Voltage = 4.8 kVRMS
    • Basic Isolation Working Voltage = 1097 VRMS
    • Reinforced Isolation Working Voltage = 565 VRMS
  • Industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design techniques
  • Filter pin allows user to filter output for improved resolution at lower bandwidth
  • 0.85 mΩ primary conductor resistance for low power loss and high inrush current withstand capability
  • Low-profile SOICW-16 package suitable for space-constrained applications
  • 4.5 to 5.5 V single supply operation
  • Output voltage proportional to AC or DC current
  • Factory-trimmed sensitivity and quiescent output voltage for improved accuracy
  • Chopper stabilization results in extremely stable quiescent output voltage
  • Nearly zero magnetic hysteresis
  • Ratiometric output from supply voltage

Design Support Tools

Allegro MicroSystems, LLC provides Gerber files for reference only. Any material, information, or instructions are provided AS IS without warranty of any kind. It is the responsibility of the User(s) to optimize any Printed Circuit Board (PCB) layout, as well as the selection of any components, for the specific application of the User(s).

Application Notes

Certificates of Compliance

Click the image to view larger
ACS724KMA Product Image Functional Block Diagram Typical Application ACS724/25MA Product Image

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
ACS724KMATR-12AB-T 16-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
Check Stock
ACS724KMATR-20AB-T 16-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
Check Stock
ACS724KMATR-30AB-T 16-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
Check Stock
ACS724KMATR-30AU-T 16-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
Check Stock
ACS724KMATR-65AB-T 16-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
Check Stock
ASEK724KMA-20AB-T DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check Stock
ASEK724KMA-30AB-T DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check Stock
ASEK724KMA-30AU-T DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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