Re: gEDA-user: QLP packages?

[Dan McMahill <dan@xxxxxxxxxxxx>]

Matthias Wenzel wrote:
> Dan McMahill wrote:
>
> > Actually, it looks like QFN and QLP are quite similar and probably 
> > close enough.  You're comparing the QLP to the wrong 20 pin QFN 
> > (welcome to the world of modern packaging).  There are 4x4mm and also 
> > 5x5mm 20 pin QFN packages.  One has a 0.5 mm pitch and the other has a 
> > 0.65mm pitch.
>
>
> Thanks a lot for your helpful information Dan and John, I was't seeing 
> the 4x4 vs. 5x5 difference. I had to do with a 5x5 QFN32 earlier and 
> wrongly thouhgt that all QFN20 are 4x4 ...

a word of warning, this sort of confusion is not limited to QFN's.
QFP's have the same issue where you can have different pin pitches for
identical pin counts.  And in case you're wondering, yes, I have seen
large and expensive boards come back with the wrong footprints for QFP's.


-Dan