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February 2008

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Subject:
From:
Ryan Grant <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 5 Feb 2008 09:38:27 -0700
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Thanks Paul,
 
If you and two others can do it, I guess it can be done...  I'm glad I
asked before I made a fool out of myself.
 
So now the question is, how did you do it (if you can tell me)?  
 
Whenever I've tried it, either gravity would cause the solder to sag out
the bottom, or the via would suck solder away from the joint.
 
Thanks,
Ryan

________________________________

From: Paul Edwards [mailto:[log in to unmask]] 
Sent: Monday, February 04, 2008 6:43 PM
To: TechNet E-Mail Forum; rgrant
Subject: RE: Open via in pad - any success?


Ryan,

It really depends on the size and depth of the via, the via to pad
diameter ratio....

Q: has anyone been successful with a via in pad that is not plugged?..
A: YES, both through and blind vias

Q: If so, was it double sided?
A: YES if you mean a double sided PCB, and YES if you mean it was a
through via..

Q: ...was one side connected to a BGA ball?
A: YES

Paul

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ryan Grant
Sent: Monday, February 04, 2008 4:55 PM
To: [log in to unmask]
Subject: [TN] Open via in pad - any success?

Hi All,

I just got told by a design engineer that LaserJet printers are built
using via in pad where the via is NOT plugged.  He claims the via is
filled with solder first, then goes through the normal SMT process.

He intends to use this to connect a BGA ball on one side of the board to
a cap on the other side using an mechanically drill via that is not
plugged.

Before I call BS on this, and tell him "do not pass go until that via is
plugged, flattened and plated over", has anyone been successful with a
via in pad that is not plugged?
If so, was it double sided?
And, was one side connected to a BGA ball?

Thanks,
Ryan

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