Nondestructive XRT plating thickness measurement results and/or confirmation?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Foster
Sent: Wednesday, October 01, 2014 7:29 PM
To: [log in to unmask]
Subject: Re: [TN] Spots on Gold

Was finally able to sacrifice a board for cross section and sem and we ran a lot of bare boards through reflow.
It seems the spots are indeed solder. Thanks for all of the input.

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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Wednesday, July 30, 2014 8:05 AM
To: [log in to unmask]
Subject: Re: [TN] Spots on Gold

Just a little history
We tend to build very small lots.
So this run was 6 pieces of 2 different boards.
Out of the 12 total pieces we had these spots on 8 boards.
All of the boards came out of the same FAB shop. I know this FAB shop outsources Their ENIG.
All of the spots have this black ring like someone took a magic marker and circled them.
Going to get on the SEM today and I am trying to find a XRF we can use. But more runs At the assembly shop and cross sections are probably next.




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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Wednesday, July 30, 2014 7:55 AM
To: [log in to unmask]
Subject: Re: [TN] Spots on Gold

This is starting to get very interesting and worrisome.
That is indeed a linear tech umodule. We do pre-bump the devices before the install.
I found out last night we actually have a SEM, even though we have L3 in the name we are a very small division. But I am going to work through all of the suggestions until we get to the bottom of it. If this is indeed a plating issue that would be really really really Bad.
Once again I really appreciate all of the input.
John

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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Wednesday, July 30, 2014 5:02 AM
To: [log in to unmask]
Subject: [TN] Spots on Gold

Morning John,

I have your second photo posted, it's here:

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

This looks interesting!

Steve


On Tue, Jul 29, 2014 at 5:56 PM, wrote:

> Hi steve
>
> I managed to get to a good microscope this afternoon. Everyone of
> these spots looks like someone circled it* w*ith a magic marker.
>
> Would you mind posting one more pic for me.
>
> Thanks
>
> John Foster
>
>
>

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