Allegro Offers Economical, Small-Footprint Current Sensor IC

Product is offered in a low-profile, surface-mount, small-outline package

Allegro MicroSystems’ new ACS724 current sensor integrated circuit is an economical and precise solution for AC- or DC-current sensing in industrial, automotive, commercial and communications systems. The small outline IC (SOIC-8) package is ideal for space-constrained applications, while also saving costs due to its reduced board area. 

The Allegro ACS724 current sensor IC can be used in such applications as load detection and management, motor control, and over-current fault protection in those applications that are tied to line voltage.

Allegro’s ACS724 device uses the latest integrated circuit technology in combination with the Hall effect, 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 Effect IC and converted into proportional voltage. The current is sensed differentially in order to reject common-mode fields, thus improving accuracy in magnetically noisy environments. 

The result is a sensor IC that can simplify and improve a wide variety of electrical and mechanical systems. The ACS724’s leadframe, providing mechanical support to the die during assembly, is plated with 100 percent matte tin, which is compatible with standard lead-free printed circuit board assembly processes. Internally, the device also is lead-free except for high-temperature lead-based solder balls, which are exempt from the Restriction of Hazardous Substances (RoHS) directive. Calibrated at the factory, the ACS724 provides a typical output error of just 1 percent.

Allegro’s ACS724 current sensor IC, featuring 3 V-to-5.5 V single-supply operation, also is available in a 3.3 V version, the ACS725. Both products allow design engineers to use Hall-effect-based current sensor ICs in new applications that require increased energy efficiency or new operating features.

The ACS724 current sensor IC features include:

• An integrated shield virtually eliminates the transfer of energy from the current conductor to the die, greatly suppressing output noise.

• The IC features greatly improved bandwidth thanks to proprietary amplifier and filter-design techniques, and as well better resolution at lower bandwidth.
• Digital temperature compensation circuitry provides for temperature control of near closed-loop accuracy, but with the economies of an open-loop sensor.

• The AS724 is available in a small-footprint, low-profile SOIC-8 package suitable for space-constrained applications.

0815 Allegro Offers Economical, Small Footprint Current Sensor IC
Image Source: Allegro MicroSystems

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