[TriEmbed] Solder paste vs mask question

[Trampas Stern]

Yes!

My experience is that the footprints and symbols are often wrong from the
UltraLibrarian and other symbol and footprint providers.  I got one
footprint for a 100mil through hole that had solder mask over the pads.
Others were missing holes, etc.

I find that I prefer to build my own symbols and footprints using Altium
and then find a 3D model of the part to verify the footprint.   That is
place a 3D model over the footprint and verify it fits.


Trampas

On Thu, Aug 31, 2023 at 1:58 PM Brian via TriEmbed <triembed at triembed.org>
wrote:

> Hi,
>
> I'm hoping some list denizens have experience that'll help me understand
> this:
>
> I've got a footprint for a 8-WDFN part from UltraLibrarian.  The
> footprint as-downloaded has negative mask expansion and offset paste
> regions.  This is hard to describe, hmmm...
>
> 1. The soldermask layer has no openings at all (I think this is pretty
> obviously an error)
> 2. The paste layer has the stencil openings offset outward from the
> pads.  Imagine the following crude ascii art as layers superimposed on
> top of each other:
>
> Copper:     [_pad_]   [_pad_]
> Paste:   [_____]         [_____]
>
> So that'd have paste partially on the exposed copper pad and partially
> on soldermask (assuming I fix problem #1 so that the pad is exposed).
>
> Is this at all normal for this kind of part?  Do other people run into
> such egregious problems in UltraLibrarian CAD models?
>
> Thanks,
> -Brian
>
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