Re: gEDA-user: Footprint TQFP100_14 pitch ?

[Dan McMahill <dan@xxxxxxxxxxxx>]

Rick Collins wrote:

> a footprint.  In the past I have found pre-designed libraries to be 
> unreliable.  So I create my own footprints from scratch... well not 
> quite from scratch.

I have found the same thing.  I've made slow progress at improving the
pcb libraries, but it is slow and tedious.

> 
> I use the manufacturer's data sheet to verify the dimensions of the 
> part and I use the PCB Library LP Viewer (IPC-7351) tool to obtain 
> workable footprint dimensions.  The only difficulty in using this 
> tool is that the naming they use is mostly the formal names which are 
> not commonly used by manufacturers.  So you have to hunt around a bit 
> to find the footprint you need.  But it is worth it in the end 
> because you have a footprint that you can trust in my opinion.

Note that we do have IPC-7351 recommended footprints (both in name and
the layout) for things like surface mount R's L's and C's.

-Dan



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