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February 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, 11 Feb 2009 13:51:09 -0500
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text/plain
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text/plain (118 lines)
Lee,

When you say "Evidently" that you have done cro




Lee,



When you say "Evidently" that you have done cross sectioning and see

that the cracks are only in the Ni and Au and not in the Cu?  Since you

said "There was no evidence of a lack of bonding between the copper and

the ENIG finish" that implies to me that you did cross section but since

I wasn't sure I thought I'd ask.



Regards,

George

George M. Wenger

Andrew Wireless 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 Steve Gregory

Sent: Wednesday, February 11, 2009 1:42 PM

To: [log in to unmask]

Subject: Re: [TN] CRACKED ENIG PADS



Hi Lee!



Have your pictures posted. They are here:



http://stevezeva.homestead.com/files/THROUGH_HOLE_CRACKS-1.jpg



http://stevezeva.homestead.com/files/THROUGH_HOLE_CRACKS-2.jpg



I have to let those that know more about plating than I do answer this

one...



Steve 



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

From: TechNet [mailto:[log in to unmask]] On Behalf Of Lee Whiteman

Sent: Wednesday, February 11, 2009 12:20 PM

To: [log in to unmask]

Subject: [TN] CRACKED ENIG PADS



I have asked Steve to put up a pair of pictures I received. They are of

cracks within the ENIG finish of a PWB. I know that the board failed,

based on IPC-6011 and IPC-6012.



My question is what would cause the cracking? Evidently, it is in the

Nickel layer and the copper layer was not compromised. There was no

evidence of a lack of bonding between the copper and the ENIG finish.

These boards are fresh from the supplier.



Just curious...



Thanks in advance.



Lee Whiteman, PMP

Senior Member Engineering Staff

L-3 Communications East

Telephone: (856) 338-3508

FAX: (856) 338-2906

E-Mail: [log in to unmask]

 



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