Hi Rui, Thanks for letting us know about the sensors. Correct about the sealant on the high side. The sealant is to avoid creepage of charge from the pads to the connector. On the high side of a bridge leg, we recommend measuring the drain current rather than source current, since our sensors are not fully immune to dV/dt. The dV/dt is a lot lower at the drain than on the source, i.e. on the switch node. Please read the advice on the datasheet about layout. It is important to have a well-defined current and return current for the sensor. If you use a ground place for the return current that should be fine, and try to avoid sharp corners in the current trace in proximity of the sensor. Hope that helps, Kind regards, Infinity Sensor

If you use the infinity sensor for this, e.g. on the drain of the upper device where dV/dt is small, you'll need to take care of the clearance, creepage etc. Rogowski coils have dV/dt problems, but you could try that, or a shunt measured with a good optically isolated voltage probe (expensive!).

Hi Max, Use a a 50 Ohm SMA to BNC cable with the MH4 to SMA adapter that comes in the kit we send out. Any 500 MHz scope would be fine, it helps if you have a maths channel that can do integration and offset, or you'd have to post-process the data to get current. Kind regards, Infinity Sensor

Hi Max, In high voltage rigs we advise against use on the high-side drain, because the sensor requires measures to ensure safe clearance and creepage distances between the sensor's connector and any traces, pads, and component terminals on the board. In lower voltage rigs, the high-side DC connection tends to have voltage disturbances on it, and these can couple capacitively into the sensor, if you are switching very fast or if you have high frequency ringing (e.g. several 100 MHz). That's said, we have used these sensors on the high-side to measure drain current. The typical inductance of the sensor is around 0.1nH on a well-designed board. This is due to the added space that you create on the board to accommodate the sensor. Once you have created this space, there is negligible added insertion inductance when you actually place the sensor. Hope this helps, Kind regards, Infinity Sensor

Please see our answer to your question in the thread you created. Let us know if that answers your question please. Kind regards, Infinity Sensor

Hi Felix, The current that you are measuring passes through copper in the sensor. At an average current of 20A, this would give you a 100C temperature rise. If you are happy with this rise, you can run at 20A, but if you would like to measure higher average currents, or if you would like a lower temperature rise, then we would need to make you a sensor for higher currents. This is on our roadmap, but prior to that we have been working on a sensor for measuring gate currents on power devices. Kind regards, Infinity Sensor