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March 2007

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Subject:
From:
Werner Engelmaier <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Thu, 29 Mar 2007 10:33:52 EDT
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text/plain
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Hi Helena,
Richard provided:
> http://www.taconic-add.com/pdf/taconic-laminate_material_guide.pdf
> 
This Material Guide does not give Tg, or the modulus of elasticity; the CTE 
values given are compatible with FR-4; you do not say what Ni plating is used 
[be careful with electroless Ni, it can lead to much earlier failures of the 
vias; electrolytic Ni enhances via relaibility].
I would still be worried about PCB warpage during the soldering process(es) 
as the result of the asymmetric lay-up.

Werner



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