> I'm using this FET in a PSU
>
> IRF5800 (109kB)
>
> http://www.irf.com/product-info/datasheets/data/irf5800.pdf
>
> I chose it for the low Ron, and it works fine as a high-side
> disconnect switch in the circuit
>
> What I wonder is though, why the package has 4 drains and only
> 1 source ? You'd think they might have made it 2 & 3 or 2 & 2

As they said, being a P Channel device the Drains will be used for 
thermal dissipation. In an N channel device you'd expect to get 
multiple Source connections.

*BUT*
I have a current application for that spec of device if the price and 
availability is right. (There are many things that would work but if 
it's easily available etc ...).

It does rather like its gate drive though compared to some :-) - 
certainly not a "logic FET" my most measures (although it could be 
used at 5V drive).

Where are you buying them?
What sort of price / quantity?
Do you have many in stock and/or any spare to resell.  A few for 
playing would do for now if there are others easily available.

Answer on or off list as considered appropriate.



        Russell





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