Ron, Wasn't there a Nickel plate over the Alloy 42? And something protective, like Au, over the Nickel? What does the component manufacturers spec sheet say for lead composition and finish? Bruce Misner > ---------- > From: Ron Waugh[SMTP:[log in to unmask]] > Reply To: TechNet E-Mail Forum.;[log in to unmask] > Sent: Thursday, November 02, 2000 8:27 AM > To: [log in to unmask] > Subject: [TN] Alloy 42 > > Technetters, > > I have a huge problem with the wetting and solderability of a fine > pitch 15 mil QFP. I then spoke with the solder supplier; which > requested a couple of the components and performed x-sections. > During > the x-sections, they also performed a metal composition of the > components lead. The metal in the leads turned out to be alloy 42, > which is ....non-wetting???? ...."or so I'm told". > > I really don't know much about metals but the solder supplier stated > that the component will never wet properly. I would really like to > get some literature on this alloy 42 and ask if anyone else has had > any of these problems and what was their fix. > > Thanks in advance for your time and energy. > > Regards, > > Ron Waugh > Process Engineer > Diversified Systems, Inc. > Phone: (317) 299-9547 Ext. #336 > Fax: (317) 298-2055 > Email: [log in to unmask] > > -------------------------------------------------------------------------- > ------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > Search previous postings at: www.ipc.org > On-Line Resources & Databases > > E-mail Archives > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > additional > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 > ext.5315 > -------------------------------------------------------------------------- > ------- > begin 600 winmail.dat M>)\^(C@/`0:0"``$```````!``$``0>0!@`(````Y`0```````#H``$(@`<` M&````$E032Y-:6-R;W-O9G0@36%I;"Y.;W1E`#$(`06``P`.````T`<+``(` M"0`!`#(`!``D`0$@@`,`#@```-`'"P`"``D``0`V``0`*`$!"8`!`"$````R M,$$X,4(U,$,V0C!$-#$Q045$03`P-3`X0D%#-C<U00`I!P$$@`$`$@```%)% M.B!;5$Y=($%L;&]Y(#0R`/($`0V`!``"`````@`"``$#D`8`0`H``"(````# M`"8```````,`-@[log in to unmask];&QO>2`T,@````(! 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