Understanding the ACS712

Hi all I bought some of these ACS712 current measuring modules in assorted current ranges (5A and 30A I think).

The datasheet says that the sensitivity of the 5A configuration is 185mV/A. This is counter intuitive as you would expect that the sensitivity would be 2.5/5 V/A; to fill the whole voltage range.

Can someone please explain to me why the chip uses that sensitivity? Thanks!

Can someone please explain to me why the chip uses that sensitivity? Thanks!

Ask the manufacturer! It doesn't have to be logical after all.

I would guess that it has something to do with the technology used to fabricate the chip. Not all semiconductor process can switch to the voltage rails. This gives the max within the limits of the process. This response is to help you get started in solving your problem, not solve it for you.
Good Luck & Have Fun!
Gil