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March 2003

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Subject:
From:
"Arbour, Michel" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 10 Mar 2003 13:45:56 -0500
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Hello technet.
This is our first design using silver filled via. We have used two different
PCB fab. A total of 7 lots have been done and the yield seen at our pcb fab
house has not improved (15%).
The major problem we have is generalized delamination after reflow (not
localized) that seems to happen around layers 4-5. Our pcb. Fab is currently
investigating on the causes. Until now , no satisfactory explanations has
been given to us.
*       Have some of you been faced against the same problem (delamination
On silver filled via).
*       Any possible Causes/solutions
*       Any theories on the most probable cause (design/process/material
compatibility ...)

At this time, product release  has been delayed.
Your help in this matter would be appreciated.

Board specification
Dimension : 6.5X9 inch board.  0.070" thickness
Sub sequential buildup Layer 5 to 12 with a total of 16 layers.
Silver epoxy filled via using dupont CB100 .
Qty of 7000 silver filled Via of 0.008"
Qty of 1000 silver filled Via of 0.010"
The populated boards has a very high thermal mass:  8 BGA . current of 96
Amps.
Impedance controlled and Burried capacitance
Line/Spacing : 0.003" / 0.005"

Best regards
Michel Arbour
Kontron
Tel. : 450-437-4661 ext. 2287

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