ACS725: Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small Footprint SOIC8 Package

The Allegro™ ACS725 current sensor IC is an economical and precise solution for AC or DC current sensing in industrial, automotive, commercial, and communications systems. The small package is ideal for space-constrained applications while also saving costs due to reduced board area. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection.

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 is programmed for accuracy after packaging. The output of the device has a positive slope when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sensing. The internal resistance of this conductive path is 1.2 mΩ typical, providing low power loss.

The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS725 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 ACS725 is provided in a small, low-profile surface-mount SOIC8 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, except for flip-chip hightemperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory.

DATASHEETS
SAMPLE & BUY

Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

If this is not your local representative, find your local sales rep here.

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  • Features and BenefitsFeatures and Benefits
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  • Technical DocsTechnical Docs
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  • AEC-Q100 qualified 
  • Differential Hall sensing rejects common-mode fields
  • 1.2 mΩ primary conductor resistance for low power loss and high inrush current withstand capability
  • Integrated shield virtually eliminates capacitive coupling from current conductor to die, greatly suppressing output noise due to high dv/dt transients
  • Industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design techniques
  • High-bandwidth 120 KHz analog output for faster response times in control applications
  • Filter pin allows user to filter the output for improved resolution at lower bandwidth
  • Patented integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an open-loop sensor
  • Small footprint, low-profile SOIC8 package suitable for space-constrained applications
  • Filter pin simplifies bandwidth limiting for better resolution at lower frequencies
  • 3.3 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

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Product Image Product Image Functional Block Diagram Typical Application

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
ACS725LLC-50AB-T n/a -20°C to 85°C -- View Data Contact your
local sales rep
Check Stock
ACS725LLLU-50 AB-T n/a -20°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
ASEK725LLC-10AU-T DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check Stock
ASEK725LLC-20AB-T DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check Stock
ASEK725LLC-40AB-T DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check Stock
ACS725LLCTR-10AU-T 8-lead SOIC -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
ACS725LLCTR-20AB-T 8-lead SOIC -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
ACS725LLCTR-20AU-T 8-lead SOIC -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
ACS725LLCTR-30AB-T 8-lead SOIC -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
ACS725LLCTR-30AU-T 8-lead SOIC -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
ACS725LLCTR-40AB-T 8-lead SOIC -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
ACS725LLCTR-50AB-T 8-lead SOIC -40°C to 150°C Yes View Data 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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