Current sensor IC increases safety, reduces BOM

April 09, 2019 //By Christoph Hammerschmidt
Current sensor IC increases safety, reduces BOM
Allegro MicroSystems has introduced a new series of AEC-Q100 qualified monolithic Hall Effect current sensor ICs for automotive applications. The ACS71240 series sensors are small and efficient and are suitable for charging devices in electric vehicles, DC/DC converters, industrial drives and IoT applications.

The ACS71240 series sensors have been improved over their predecessor, the ACS71111, and are now offering:

  • higher immunity of the output signal to stray magnetic fields;
  • improved output signal accuracy (typ. <1.5%);
  • insensitivity of the output signal to supply voltage rails subject to interference.

The sensors also feature a very fast overcurrent fault output with a response time of 1.5 µs, which improves system safety. This fault output makes it easy to detect a short circuit and prevent damage to MOSFETs or IGBTs in inverters, drive electronics and other switching power electronics.

The sensors are available in two very space-saving housing variants, each offering different levels of galvanic isolation. The QFN package with Wettable Flank, measuring only 3 mm x 3 mm, can be used on voltage rails with up to 120 VDC and enables solder joint inspection as required for 0 ppm automotive applications. The SOIC8 package with its standard dimensions is UL certified for 2400 Veff isolation voltage and supports an operating voltage of 420 VDC or 297 Veff. 

The ACS71240 series replaces shunt resistors, operational amplifiers, current transformers, and voltage isolators in applications requiring small-format, monolithic sensor solutions. These fully integrated solutions reduce the overall cost of current measurement by eliminating the need for discrete devices that take up board space. The sensors are available for 5 or 3.3 V operation.

Further information:

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