Concur.
For the sake of argument (and supplier entrapment :-)), ask them to
provide in process plating cross sections used to verify copper
thickness to demonstrate the full copper thickness was there before
going to OSP. They won't have them of course... They won't even
have sections taken as part of final lot acceptance.
Ask me how I know. Yeah, got that t-shirt too.
At 08:25 AM 9/9/2009, Wenger, George M. wrote:
>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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