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Date: Mon, 19 Jan 2015 12:50:47 +0100
From: Gabriel Paubert <paubert AT iram DOT es>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] HIDDEN PINS IN A SYMBOL
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On Sun, Jan 18, 2015 at 01:58:27PM -0500, DJ Delorie wrote:
> 
> > Slightly not directly related to symbols, but it always sstrikes me as
> > odd that some (actually most for that kind of part) manufacturers
> > decide to use four pins for the drain, but only one for the source
> > terminal.
> 
> I always assumed the drain was on the bottom of the wafer, and that
> the extra pins were for heat dissipation...  The OnSemi app note
> for their ChipFET line say:

Correct:

http://www.micross.com/pdf/fairchild/mosfet/FDB031N08_MOSFET_DIE.pdf

    Gabriel