Automotive grade current sensor IC from Allegro

Allegro MicroSystems has announced a new family of automotive AEC-Q100 qualified, monolithic Hall effect current sensor ICs.

Created to be small and energy efficient, the ACS71240 family has been designed to offer next generation improvements over its predecessor, ACS711.

These include output signal immunity to stray magnetic fields (created by adjacent motors or current carrying wires); improved output signal accuracy (<+/-1.5% typical); and output signal immunity to noisy supply voltage rails.

The ACS71240 family also features a fast, dedicated over current fault output that has a typical response time of 1.5 µs. This fault output provides a means of detecting short circuit events that Allegro says will prevent damage to MOSFETs or IGBTs in inverter, motor and other switching power electronics applications.

The device is offered in two small form factor package options, each providing different levels of galvanic isolation. The 3mm x 3mm, wettable flank QFN package can be used on voltage rails up to 120 V DC and enables solder joint inspection required in zero PPM automotive applications. The standard footprint SOIC8 package is UL certified to 2400 V RMS of isolation and offers a working voltage of 420 V DC or 297 V RMS.

The ACS71240 family is designed to replace shunt resistors, operational amplifiers, current transformers and voltage isolators in applications that require small form factor, monolithic sensor solutions.

Allegro says these fully integrated solutions reduce the overall cost of current sensing by eliminating discrete components that demand printed circuit board area. The sensors are offered for use on 5 V or 3.3 V power supplies.