您好！Engelmaier,
YES,BF is the typical character of ENIG（electroless Nickel），but the
nickel of cooper pin must be electroplated.（about this point, I have to
further confirm it with our supplier）. But whether the electroplated nickel
has the same issue?
Min Jun
H3C process engineer
Tel:+86-010-82774234
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-----邮件原件-----
发件人: TechNet [mailto:[log in to unmask]] 代表 Werner Engelmaier /*
发送时间: 2008年9月19日 19:50
收件人: [log in to unmask]
主题: Re: [TN] Copper balls/pins--Brittle failure
Nee hao Min Jun,
Now that you say "nickel" and "brittle failure"in one breath, the
likelihood
that you have ENIG's 'back pad' is retty strong. In these cases, the
interface between the Ni and the IMClayers is weakened, and sfficient
loading causes
brittle failure.
You should be attending my workshop dealing with this issue this coming
Monday at IPC Midwest Conference.
Regards,
Werner Engelmaier
可靠性先生
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL 32174 USA
Phone: 386-437-8747, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com
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