Mail Archives: geda-user/2013/01/30/20:47:10

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Date: Thu, 31 Jan 2013 02:46:05 +0100
From: Kai-Martin Knaak <kmk AT familieknaak DOT de>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] [patch] Pinnumbers in mosfet-with-diode-1.sym
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Stefan Salewski <mail AT ssalewski DOT de> schrieb am 30. January 2013:

> There is nothing really broken


> the user should replace the letters with
> correct numbers for his transistor. It would be possible to let the
> letters unchanged, if we use an exactly matched footprint for PCB
> layout -- that footprint would have letters too instead of numbers.

I prefer the latter. Manufacturers tend to enumerate pins in data sheets
in different ways. In my experience, letters that refer to actual
function are less prone to misread than digits. In addition, letters
work the same across different packages. TO220, TO247, TO92, TO18,
TO252, D2PAK, SO23, SOT23, etc.

> But then we would need a really large number of footprints, because of
> possible permutations of the letters.

Only some permutations are actually used. Of course, with letters you
have to provide geometrically identical footprints for MOSFETs and
bipolar transistors. On the other hand, there is only one symbol to
cater them all. Seems like this is a case of "pick your poison".

Kai-Martin Knaak

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