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May 2006

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Subject:
From:
John Burke <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, John Burke <[log in to unmask]>
Date:
Thu, 11 May 2006 16:28:47 -0700
Content-Type:
text/plain
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text/plain (129 lines)
My apologies, I read the pad size as  22 with an 18 mil mask opening, but
you were referencing the via pad not the BGA pad..............

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Preuschl, Thomas
Sent: Wednesday, May 10, 2006 11:09 PM
To: [log in to unmask]
Subject: Re: [TN] Unplugged via under BGA

Hello John,

what do you mean with 90 degree wetting angle?

Tom

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Burke
Sent: Wednesday, May 10, 2006 6:32 PM
To: [log in to unmask]
Subject: Re: [TN] Unplugged via under BGA

1 You should not be using solder mask defined pads particularly if you
are
going lead fre s gives a 90 degree wetting angle which acts as a stress
riser.

2 If you are plugging the vias, you will not be able to do this at most
fab
shops on a silver finish.

3Yes I have reworked them obviously with the plugged via no problem on
degradation. If the vias are unplugged, have used a process to apply a
double layer of mask at the via hole only to protect it during re-work.
This
works great if you can't plug.

4 Do not have cost data available.

John

http://www.rohsusa.com



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Miswald, Ron
Sent: Wednesday, May 10, 2006 7:41 AM
To: [log in to unmask]
Subject: [TN] Unplugged via under BGA

All

There is a board where this recently came up on.  The vendor is one we
haven't dealt with before.  I looked in the tech net archives, and did
not
find an answer to this specific question.  The vias under the BGA are 22
mil
pad, 18 mil solder mask, and 12 mil hole.  I usually ask for the vias to
be
filled or plugged...

My question:
1) Has anyone else had experience with running this type of board?
2)If not, has anyone had them reworked?
a)by who?
b) what was cost per via, or board?

Any shared experiences appreciated
Ron

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