On Fri, 25 May 2007 22:23:43 +1200, you wrote:

>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

The Drain will be the leadframe, more pins allow better heat transfer

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