ASIL C safety rated mag-field-based current sensor for EV power trains. 

The company “has developed the ACS37601 programmable linear Hall-effect current sensor IC with over-current, over-temperature and self-test capabilities,” it said. The part “is Allegro’s highest-accuracy field current sensor for applications requiring measurement capability greater than 200A”.

To be used along with a C-core, 0.8% sensitivity error and <±5mV offset error are claimed over the automotive temperature range – operation is over -40 to +150°C and from 5V or 3.3V. The output is ratiometric with the supply voltage.

For dc battery charging and high-frequency inverters, bandwidth spans dc to 240kHz and response is in 2μs.

As the sensor is intended to be used in safety critical applications, a dedicated programmable pin is included for over-current and over-temperature indication.

It is not yet in production, but samples are available in the company’s 1mm thick four-pin single-in-line ‘KT’ package with straight (suffix TN) or formed (..TH) leads – the latter for vibration-tolerant surface mounting.

Two parts are planned, one factory-programmed to 500μV/G at 5V and the other 1mV/G.

A minimum for four external components are needed: a bypass capacitor, a pull-up for the fault output and a parallel RC filter for the output.

There is a minimal ACS37601 product page – data sheet have to be requested.