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September 2009

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Subject:
From:
"Wenger, George M." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Wenger, George M.
Date:
Wed, 9 Sep 2009 11:25:48 -0400
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Richard is correct that your picture illustrates poor coppe
Jim,



Richard is correct that your picture illustrates poor copper plating.

This problem wasn't caused because there was a micro-etch prior to OSP.

There is always a micro-etch of the plated copper prior to applying the

final surface finish.



Regards,

George

George M. Wenger

Andrew Solutions

Senior Principal FMA/Reliability Engineer

40 Technology Drive, Warren, NJ 07059

(908) 546-4531 (Office) (732) 309-8964 (cell)

[log in to unmask]

-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.

Sent: Wednesday, September 09, 2009 10:56 AM

To: [log in to unmask]

Subject: Re: [TN] PTH problem



The pictures illustrate poor copper plating in the via hole walls that

could be due to a number of reasons, all from fabrication issues. There

should be at least a .001" thick continuous copper wall inside the via,

but these pictures represent a very bad copper plating process.

I have never heard of the OSP process causing copper to be further

reduced.

I would not use any of these boards, even if they pass flying probe

test, and I would not use that board supplier again.

Just because they pass test as a bare PWB does not mean they will be

reliable later; they could fail due to the vias opening up when the

board is heated or slightly stressed. 



But I will sleep well tonight knowing that when the operators eat their

food off of these PWBs they will not be contaminated with lead.



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of J W

Sent: Wednesday, September 09, 2009 9:41 AM

To: [log in to unmask]

Subject: [TN] PTH problem





 Hi TechNet group,



I'm really getting nervous about a China bare board supplier and their

quality and need your opinions.  Please take a look at the picture by

clicking on the link below showing two plated through holes (via's).

The

problem reported originally was a bad ground connection between ground

via's

and ground planes.  As you can see, the pictures are very telling, and

you

can clearly see the ground plane not connected (several planes not

connected

actually).  What I'm also nervous about is the comment listed below the

pictures "The plated copper on PTH surface will be etched thin after OSP

process".  Is that statement correct?  I'm not a bare board expert by

any

means, but I believe a PTH should have a little more copper than what is

shown?  I know that OSP is not something new, so are other board

suppliers

dealing with the same issue of possible thin PTH walls because of OSP?



I also submitted pictures early last week regarding the same supplier

having

problems with the their solder mask process, so to me, I'm thinking this

board shop is not up to standards and we should inform out board

assembler

house to look for another supplier...immediately?



Thanks for your help!



Jim



http://stevezeva.homestead.com/PTH_Connection_issue.jpg



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