Edwin
I agree with George that we do not understand black pad well enough to create an absolute test and then guarantee that that product will be free of the defect. What suppliers can do that to a some extent will minimize the likelihood is to guarantee that the product was built to the chemical suppliers process instructions. Keep in mind though this will dictate the thickness of the gold and nickel.
Best regards
Lee
J. Lee Parker, Ph.D.
JLP Consultants LLC
804 779 3389
----- Original Message -----
From: Wenger, George M.<mailto:[log in to unmask]>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Monday, August 01, 2005 9:07 AM
Subject: Re: [TN] RoHs board surface recommendations.
Edwin,
I'm not sure platers can give a guarantee that the boards they send are Black Pad Free because all of the evaluations I've seen that were run to determine what causes Black pad didn't show any problems. If a plater can't intentionally generate Black Pad failures then I'm not sure how they are going to provide Black Pad Free boards until they understand the root cause.
Regards,
George
George M. Wenger
Reliability / FMA Engineer
Base Station and Subsystems Group
Andrew Corporation, 40 Technology Drive, Warren, NJ 07059 (908) 546-4531 [log in to unmask]<mailto:[log in to unmask]>
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Edwin Louis
Sent: Monday, August 01, 2005 8:38 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: [TN] RoHs board surface recommendations.
Ask the plater for black pad free ENIG.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of George Milad
Sent: Friday, July 29, 2005 7:14 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: [TN] RoHs board surface recommendations.
Do not discount ENIG.
There is data available now showing that soldering to the Ni surface at the
SAC alloy temperature conditions produces a very robust solder joint.
There are Ni baths available now that are RoHS compliant i.e. no Cd and no
PB.
Best regards
George Milad
[log in to unmask]<mailto:[log in to unmask]>
National Accounts Manager for Technology
Uyemura International Corporation
Technical Center
240 Town LIne Rd
Southington CT 06489
(516) 901 3874 (mobile)
(860) 793-4011 (office)
(860) 793-4020 (fax)
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