ACS732 and ACS733: 1 MHz Bandwidth, Galvanically Isolated Current Sensor IC in SOIC-16 Package

The ACS732 and ACS733 are a new generation of high bandwidth current sensor ICs from Allegro™. These devices provide a compact, fast, and accurate solution for measuring high-frequency currents in DC/DC converters and other switching power applications. The ACS732 and ACS733 offer high isolation, high bandwidth Hall-effect-based current sensing with user-configurable overcurrent fault detection. These features make them ideally suited for high-frequency transformer and current transformer replacement in applications running at high voltages.

The ACS732 and ACS733 are suitable for all markets, including automotive, industrial, commercial, and communications systems. They may be used in motor control, load detection and management, switch-mode power supplies, and overcurrent fault protection applications.

The wide body SOIC-16 package allows for easy implementation. Applied current flowing through the copper conduction path generates a magnetic field that is sensed by the IC and converted to a proportional voltage. Current is sensed differentially in order to reject external common-mode fields. Device accuracy is optimized through the close proximity of the magnetic field to the Hall transducers. A precise, proportional voltage is provided by the Hall IC, which is factory-programmed after packaging for high accuracy. The fully integrated package has an internal copper conductive path with a typical resistance of 1 mΩ, providing low power loss.

The current-carrying pins (pins 1 through 8) are electrically isolated from the sensor leads (pins 9 through 16). This allows the devices to be used in high-side current sensing applications without the use of high-side differential amplifiers or other costly isolation techniques.

The ACS732 and ACS733 are provided in a small, low profile, surface-mount SOIC-16 wide-body 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 lead-free. These devices are fully calibrated prior to shipment from the Allegro factory.


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

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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • AEC-Q100 automotive qualified
  • High bandwidth, 1 MHz analog output
  • Differential Hall sensing rejects common-mode fields
  • High-isolation SOIC16 wide body package provides galvanic isolation for high-voltage applications
  • Industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design
  • UL60950-1 (ed. 2) certified
    • Dielectric Strength Voltage = 3.6 kVRMS
    • Basic Isolation Working Voltage = 616 VRMS
  • Fast and externally configurable overcurrent fault detection
  • 1 mΩ primary conductor resistance for low power loss and high inrush current withstand capability
  • Options for 3.3 V and 5 V single supply operation
  • Output voltage proportional to AC and DC current
  • Factory-trimmed sensitivity and quiescent output voltage for improved accuracy
  • 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

Click the image to view larger
ACS732-3 Product image ACS732-3 Functional Block Diagram ACS732-3 Typical Application

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
ACS732KLATR-40AB-T 16-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
Check Stock
ASEK732KLA-40B-T DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check Stock
ACS733KLALU-20AB-T n/a -20°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
ACS733KLALU-40AB-T n/a -20°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
ACS733KLALU-40AU-T n/a -20°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
ACS733KLALU-65AB-T n/a -20°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
ASEK733KLA-20B-T DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check Stock
ASEK733KLA-40B-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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