[TriEmbed] Solder paste vs mask question

Brian lugmail at undecidedgames.com
Thu Aug 31 12:47:48 CDT 2023


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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