---------------------- Forwarded by Bruce Stacy/ECSDOMAIN on 03/08/99 10:39 AM --------------------------- (Embedded (Embedded image moved to file: image moved to pic17987.pcx) file: Bruce Stacy pic03735.pcx) (Embedded image moved to file: pic25624.pcx) 03/05/99 01:07:52 PM (Embedded image moved to file: pic11900.pcx) To: "\"TechNet E-Mail Forum.\" <[log in to unmask]>, \"Alderete, Michael\"" <[log in to unmask]> cc: Subject: Re: [TN] Solder Attachment [Au plating in...] (Document link not converted) Michael, It is % by weight. The magic number I have seen kicked around the most is 3%. It is not to exceed 3% by weight anywhere in the soldr joint. Ther was an article published recently in Electronic Packaging & Production by Seth Enwright of Lockheed Martin Commercisal Electronics, Hudson, NH Effects of Gpld Diffusion on Near-Eutectic Solder Joint. It was informatve, but I'm not sure when it was published. Bruce Stacy Lucent Technologies "Alderete, Michael" <[log in to unmask]> on 03/05/99 12:26:16 PM Please respond to "\"TechNet E-Mail Forum.\" <[log in to unmask]>, \"Alderete, Michael\"" <[log in to unmask]> To: [log in to unmask] cc: (bcc: Bruce Stacy/ECSDOMAIN) Subject: Re: [TN] Solder Attachment [Au plating in...] Wes- 5 micoinch Au is a typical, minimum thickness Au plating. If you can calculate that it will go into solution, and form a solder joint with less than 5% [less than 2%??] Au in PbSn, than you most likely are ok. If the Au isn't allowed to disperse throughout most, or all, of the solder joint, you may have localised high Au concentrated areas, which might pose a reliability risk. Can any of you metallurgists clarify whether this <5% Au rule of thumb (or blind faith?) is in terms of volume or weight percentage of Au? This is of great interest to those of us who'd like to convert from HASL PWB pad finishes to Au/Ni, for SMT PWBs. Regards, Michael Alderete Aerojet Wes wrote... ------------------------------ Date: Thu, 4 Mar 1999 14:23:20 -0500 From: Malewicz Wesley <[log in to unmask]> Subject: Solder Attachment I have a part that is made out of .005 thick Beryllium Copper with a finish per MIL-G-45204 Type 1 with 5 micro-inches Hard Gold. This part is a surface mount part and attached to the PCB via solder paste then re-flowed. My question is, should I experience any long term reliability or soldering problems with the attachment of this part? Thanking you in advance for your comments. 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M"-`/",(/",(/",4/P@@/"`\(P@\(#P@/"`\(#P@/",(/"`\(#\((#P@/"`_# M"`_""`_#"`_#"`_$"`\(#\4(#\((#P@/Q0@/P@@/Q@C#",((SP\(P@\(#P@/ M"`\(#PC"#PC##PC"#P@/P@C$#PC"#P@/"`\(#P@/"`\(#\((#P@/"`\(#\(( M#\((#P@/"`\(#P@/P@C"#\,(#P@/Q`C"#\,(#\4(#P@/R0C""`_#"`C*#PC% M#PC*#PC##PC"#PC&#P@/",(/"`\(P@\(P@\(#P@/",(/"`\(#\((#P@/P@@/ M"`\(#P@/PPC"#\,(#\8(#\0(#\((#\H(#P@/Q@C#"`@,````@````(``@(`` M``"`@`"``("`@("`P,#`_P```/\`__\```#__P#_`/______```````````` M```````````````````````````````````````````````````````````` M```````````````````````````````````````````````````````````` M```````````````````````````````````````````````````````````` M```````````````````````````````````````````````````````````` M```````````````````````````````````````````````````````````` M```````````````````````````````````````````````````````````` M```````````````````````````````````````````````````````````` M```````````````````````````````````````````````````````````` M```````````````````````````````````````````````````````````` 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