# What does sensitivity mean for a current sensor when given in "mV/N" or "mV/mT" rather than "mV/A"?

I have been analyzing various datasheets of current sensors and majorly getting sensitivity given in "mV/A," from which I understand the output voltage per 1 ampere. I do not understand it when sensitivity is given in "mV/N" and "mV/mT".

Sample snaps: CS series datasheet. TLE4972 d.atasheet

How can we understand this?

• I'd guess that 'N' is probably the number of 'turns', and the spec is given at the sensor's "Sensed Current". So the CSLA2CD would give you 32.7mV per turn at 72A. Dec 16, 2022 at 13:19
• That says mV·N, not mV/N. Dec 16, 2022 at 13:38
• If you follow the asterisk you see that N is defined as the number of turns. Whether the units make sense here is another question. Dec 16, 2022 at 13:45

The first one is using units that are a bit sloppy. It should be $$\\frac{mV}{A\cdot N}\$$ where N is the (dimensionless) number of turns through the core. So mV/A is the number given multiplied by the number of turns.
Not "mV/N" but $$\ (mV\times N)\$$, where $$\ N\$$ is number of turns. This refers to a current transformer where transformer iron or ferrite confines magnetic lines so that a primary winding (usually one-turn) links almost entirely to multiple secondary turns.