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On Tue, 8 Sep 2015 17:42:20 -0400
DJ Delorie <dj AT delorie DOT com> wrote:

> 
> > The only thing I have to say about the library is that usually the
> > work is started with a fast sketch, second step usually are to
> > assign some resistor values, third state if there are nothing more
> > is to assign footprints and last step but usually not for all
> > components are to assign manufacturer part number.
> 
> Right, but that's hard to do with things like NAND gates or
> transistors, where the manufacturer's part number determines the
> pinout.  Which is why we're talking about this now :-)

In these cases manufacturer is determined already from beginning so selection will be simple and it usually also is for micro controllers but this is not the case for all symbols. Actually even though manufacturer already is determined for example micro controllers usually are available with different footprints and memory size.

For microcontrollers it might be rather common to update manufacturer part number then software run out of memory. In this case it make sense to update schematics and BOM but not PCB-->Gerber-->... This is a rather important point then it come to maintenance and a good work flow.

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