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Item Subject: PLUGGED VIAS -Reply
The only soldermask I am aware of that can plug vias is dry film mask.
If there is an LPI mask that can covers vias can someone tell me
about this.
Thank You:
Steve O'Hara
______________________________ Reply Separator _________________________________
Subject: PLUGGED VIAS -Reply
Author: Non-HP-bmetcalf ([log in to unmask]) at
HP-Vancouver,shargw2
Date: 10/14/96 11:12 AM
If you are using a photo defined solder mask, you can control which
pads are covered/filled and which pads are cleared.
Bob Metcalf
Morton Electronic Materials
>>> Barry Darnell <[log in to unmask]> 10/14/96 11:41am >>>
I have run into a problem with a board that has vias in smt pads. We
need all of the vias plugged, and I am told that solder mask is the best
way to do that. This is to ensure that a good vacuum is maintained for
our ATE equipment. That is the problem. I can not have a via covered
with solder mask on top of an smt pad. The board house I am using says
this is difficult for them because they have to determine which vias are
plugged and which are not. Anyone out there with any suggestions?
Thanks,
Barry Darnell
(864)627-8800 Ext. 231 [log in to unmask]
CD Electronics, Inc.
Printed Circuit Board Designer
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