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Hi,
I was just wondering what a typical value for the ON resistance of a FET was? I've calculated 333kΩ, which seemed very high - I wanted to check whether this sounds about right or not?
With very many thanks,
Froskoy.
What???? Many parts have less than 1 ohm. The FDS5670 is a 10A part with 0.014 ohms of on resistance.Assuming it's an N channel MOSFET, anything less than 1 ohm is rubbish.
Probably, if your fingers are on the probe then 333k is about right. If the MOSFET is hot then there is on current. (low resistance) I just look at a data sheet that shows 1mA of off current at 150 degrees C.For the off resistance, you are looking at tens of megaohms.
A quick search shows 24 MOSFETs with more than 100 ohms on resistance. ZVN1409 is 250 ohms.No FET I am aware of as more than 100ohm on resistance.
With FET being used as JFET and MOSFET it is hard to know. Either way; 333k ohms on resistance???? I dough we will ever know the part number.Is he talking FET as in JFET or FET as in MOSFET? Big difference.