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November 1997

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Subject:
From:
Gabriela Bogdan <[log in to unmask]>
Reply To:
TechNet Mail Forum.
Date:
Tue, 25 Nov 1997 08:20:50 +0000
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[log in to unmask] wrote:

> Hi Gaby,
> I would recommend, that you require thatmthe coupons on the panels for
> your
>  PCBs contain the smallest hole diameter drilled for your PCBs.
> Depending on
> drilled PTH diameter and PCB thickness (Smaller diameters & thicker
> PCBs are
> worse), good plating may require special plating solutions allowing
> plating
> at lower plating current densities.  I, of course, assume that your
> PCB
> vendor has vibrators in place on the plating frames for all wet
> processing to
> avoid entrapped air and/or hydrogen bubbles in the PTHs.
> But, the integrity of the plating in small vias does not only involve
> the
> plating thickness, but also the quality of the copper deposited. The
> deposit
> also requires adquate strength and ductility to survive solder
> assembly.
> While tensile strength and fatigue ductility measurements of mandrel
> samples
> plated concurrently with your product give some indication, the copper
>
> plating quality on the PTH will almost always be below the properties
> from a
> mandrel sample.
> That is why testing is done-- the new IST test is quick and
> correlates, at
> least qualitatively, with thermal cycling.
>
> Werner Engelmaier
> Engelmaier Associates, L.C.
> Electronic Packaging, Interconnection and Reliability Consulting
> 23 Gunther Street                                 In
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   Thank you all for your help.
Please tell me where I can find the IST test and if printed circuits
manufacturers
perform it for all batches as a standart test.
Thank you,
Gaby

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