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August 2011

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Subject:
From:
Ed Popielarski <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ed Popielarski <[log in to unmask]>
Date:
Mon, 8 Aug 2011 10:09:39 -0700
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Greetings again Comrades!

 

My corporate mail server hasn't liked Technet mail, so I've been lurking
from home. We have new IT staff, so they feel it should work now.

 

That being said and done, I have 1 of 100 boards that has 2 PTH's with a
rough surface. The rest of the holes in the lot look fine, it's limited
to these two.

 

I've never run across this before. The surface looks uniform (ENIG), but
the Cu seems to be cratered, including the inside of the barrel, as well
as a pronounced knee.

 

My question is, what could be the root cause?

 

Pic to follow courtesy of the esteemed Mr. Gregory.

 

 

 

Regards,

 

Ed Popielarski

 

Engineering Supervisor

 

 

NBS Corporation

2950 Patrick Henry Dr.

Santa Clara, Ca. 95054

 

Ph: 408-654-1100

Fx: 408-654-1107

Cl: 408-234-1497

Cl: 949-581-6601 (please use this number after hours)

 


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