Dwight, et al-
We're looking at plating over conductive filled via-in-pad for 1mm pitch BGAs (small vias, thick boards). How much trouble are we going to get into?
Larry Jindra
Mfg Engr Group Lead
[log in to unmask]
--------------------------------------------------------Original Message-----Consider using a 100% solids via fill material. There's several good ones available. Peters and Taiyo (HBI-200DB4/TA20DB4) probably have the best and MacuVia should be fine for this requirement as well. Stay away from the conductive fills if possible (CB100 et al).
From: Dwight Mattix [mailto:[log in to unmask]]
Sent: Friday, January 24, 2003 2:01 PM
To: [log in to unmask]
Subject: Re: [TN] Completely Plugging Vias.
dw
At 09:54 AM 1/24/2003 -0500, you wrote:
Greeting mighty TechNetters.---------------------------------------------------
Here's a common question, I think, but not common enough that I found it in a search.
Scenario-Small PWB fab shop. Customer wants vias (no larger than .016 inch) plugged to prevent light, vacuum, you name it, from escaping through. Must be plugged from at least one side, and tented on the other. We build it on an 16x18 panel, probably .063 finished thickness with 1/1 outers. LPI and SMOBC ink are applied manually at this time. (squeegee, squeegee, bake [or tack]) We have not come up with a reliable process. New equipment is probably not an option yet, unless its like a bigger squeegee. (ha ha).
Any assistance is appreciated.
Steve MacDonald
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