Products Overview

ACS724/ACS725 Isolated Current Sensor

Allegro MicroSystems

ACS724 and ACS725: High-Accuracy, Isolated Current Sensor with Stray Field Rejection

The Allegro ACS724/ACS725 family of current sensor ICs are economical and precise solutions for AC or DC current sensing in industrial, automotive, consumer, and communications systems. They are offered in multiple compact packages with a high level of integration that fits various application needs. These devices consist 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 that is sensed by the integrated Hall IC and converted into a proportional voltage. The current is sensed differentially in order to reject stray fields, improving accuracy in magnetically noisy environments. The current conductor is inherently isolated from the device signal leads due to its internal structure which results in a high isolation voltage rating for the various offered packages. All of these devices offer very low ohmic losses as low as 265 µΩ.
The ACS724/ACS725 devices are provided in small, low-profile surface-mount SOIC8 (LC) and custom SOIC16 packages (MA and MC). The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes.
The MA and LC packages offer high isolation voltage with a maximum nominal current of 50 A, while the MC (20 Mil) package offers up to 90 A nominal current measurement. These current ratings vary depending on the ambient operating temperatures.

Product Number: ACS724 / ACS725

Class: Current Sensor,PowerManagentIC(PMIC)

Tag: Hall-Accuracy Current Sensor, Isolated Current Sensor

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
Filter pin simplifies bandwidth limiting for better resolution at lower frequencies
5 V, single supply operation

Industrial Motor Control xEV Onboard Chargers (OBC) Solar Inverters
Load Detection and Management Switched Mode Power Supplies Overcurrent Fault Protection

Part Number Output Type Frequency Current Rating Operating Supply Voltage Response Time Moisture Sensitive Isolation Voltage Operating Temperature Supply Voltage Package Type
ACS724 Analog 120 kHz 20A 5 V 4µs Yes 24,004,800 -40 °C ~ 125 °C(TA) 5 V 8-Pin SOIC,16-pin SOICW
ACS725 Analog 120 kHz 20A 5 V 4µs Yes 24,004,800 -40 °C ~ 125 °C(TA) 3.3 V 8-Pin SOIC,16-Pin SOICW,16-Pin SOIC

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  • See below for downloadable documentation, software, and other resources.

    ACS724 Datasheet Download on Dec, 2022
    ACS725 Datasheet Download on Dec, 2022

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