[PCB_FORUM] Re: Anti Soldermask

Hi Robert,

Couple things.

1)Tenting vias with LPI. I've done a couple things effectively. Use at
your discretion. Normally I tent almost the complete via (when I have
large vias, say >.012"). I'll cover the pad, but expose at least the drill
hole size. So, if I have a .012" via, I'll expose .012-.014", both sides.
Smaller vias I cover completely... normally.
2) For BGA patterns, I cover the vias completely on the BGA side. I will
open the soldermask on the opposite side at least as big as the drilled
hole size.

Now, for selectively changing the vias? I'll create multiple via padstacks
for particular vias (covered, exposed one side, exposed both sides), and
using the "Replace Via" SKILL routine, I'll selectively replace the vias I
want changed. Works fast, pretty easy. Have you used "replace via"? If
not, give it a try. Could save you time.

Good day.
Mitch

>
> Hi All,
>
> is there a way in Allegro to cover some vias by a soldermask but not by
> replacing the definition of via. The simplest would be to draw a shape
> which would work as anti-soldermask, i.e. it would clear all existing
> soldermask openings over the shape area. I would like to quickly cover
> vias under some components leaving second side of vias not covered by a
> solder mask. The board uses several via sizes and changing manually vias
> to: covered on top / covered on bottom / covered on both sides is a lot
> of work. One possibility would be to modify an art output, but the
> preferred method is to have it done in the design. If I could embed such
> feature into footprints would be even better.
>
> One more question: I've read recently that tenting vias (covering by
> soldermask on both sides of the board) is not recommended. Is that a true?
>
> thank you for suggestions,
> Robert
>
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