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Checking Mosfets


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Hello,

While checking the N Channel Mosfet. I put the multimeter in the Beep mode (continuity mode)

Probing the -ve probe at the Mosfet Drain (tab), the +ve probe at the Source pin - the multimeter reads 500+ ohms which is the body diode I think.

Then

Still probing the -Ve on the Drain
I touch the +ve probe on the gate for a moment and then probe it back on the source it shows a dead short.

I don't know why this happens. Any body knows about this, please share.

The mosfet I used is FDD13AN0 from Fairchild initially

I tried the same with the:
BUK919 from NXP
NTD5867NL and a couple more and all show the same.

Regards
Pier

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