Allegro MicroSystems, Inc. Announces New High Current/High Temperature Hall-Effect-Based Linear Current Sensor IC

Optimized for 3.3 V Operation

Worcester, MA – Allegro MicroSystems, Inc. announces a new current sensor IC that provides an economical and precise solution for AC or DC current sensing in 3.3 V supply applications. This new device is targeted at the automotive and industrial markets. Typical applications include motor control, load detection and management, power supply and DC-to-DC converter control, inverter control, and overcurrent fault detection.


The device consists of a precision, low-offset linear Hall sensor circuit with a copper conduction path located near 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. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy at the factory. High level immunity to current conductor dV/dt and stray electric fields, offered by Allegro proprietary integrated shield technology, guarantees low ripple at output and low offset drift in high-side, high voltage applications. The output of the device has a positive slope (>VCC / 2) when an increasing current flows through the primary copper conduction path (from terminal 4 to terminal 5), which is the path used for current sensing.

The internal resistance of this conductive path is 100 Ω typical, providing low power loss. The thickness of the copper conductor allows for 200 A continuous current sensing applications and survival to much higher transient currents. The terminals of the conductive path are electrically isolated from the sensor leads (pins 1 through 3). This allows the ACS759 family of sensors to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. The device is fully calibrated prior to shipment from the factory.

The ACS759 senor IC is lead (Pb) free. All leads are plated with 100% matte tin, and there is no lead inside the package. The heavy gauge leadframe is made of oxygen-free copper. It is available in a small 5-pin CB package with easy mounting capability.

Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance semiconductors. Allegro's innovative solutions serve high-growth applications within the automotive market, with additional focus on office automation, industrial, and consumer/communications solutions. Allegro is headquartered in Worcester, Massachusetts (USA) with design, applications, and sales support centers located worldwide. Further information about Allegro can be found at www.allegromicro.com.

Featured Product

Rolls Battery - Maintenance-Free AGM & GEL Batteries

Rolls Battery - Maintenance-Free AGM & GEL Batteries

With a full range of capacity options (85AH-3300AH) and voltage configurations to choose from, Rolls Battery maintenance-free 2V, 6V & 12V AGM and broad range of 2V GEL models offer a valve regulated lead acid (VRLA) battery option with the same dependable energy storage and heavy-duty construction customers have grown to expect from the Rolls brand for over sixty years. Installed in off-grid, grid-tied or backup float applications, these sealed batteries require minimal ongoing maintenance and provide a versatile energy storage solution for remote or confined installations. Rolls Battery AGM and GEL battery lines deliver superior cycle life and are backed by an industry-leading warranty.