Yep George, you and me both...hehehe http://stevezeva.homestead.com/files/going_to_work_monday.wmv -Steve Gregory- -----Original Message----- From: Wenger, George M. [mailto:[log in to unmask]] Sent: Monday, November 06, 2006 7:53 AM To: TechNet E-Mail Forum; Steve Gregory Subject: RE: [TN] Gold Embrittlement Ingemar, I needed something to put a smile on my face on a Monday. I typically have problems on Monday. I've attached an image of how I come to work on Monday's and have copies Steve for posting. I just can't wait until Friday comes (second attachment) Regards, George George M. Wenger Senior Principle FMA / Reliability Engineer Wireless network Solutions Andrew Corporation, 40 Technology Drive, Warren, NJ 07059 (908) 546-4531 [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory Sent: Monday, November 06, 2006 8:35 AM To: [log in to unmask] Subject: Re: [TN] Gold Embrittlement Mornin' Inge! Holy Mackerel!! That really shows some embrittlement: http://stevezeva.homestead.com/files/au_embrittlement.doc That last picture looks like the bottom of a forest floor! I had a very small transistor like that one time, and I think I asked the group if I should tin it. The reason I asked was because it was so small, and I didn't know if I would damage it by dipping it: http://www.stevezeva.homestead.com/files/BipolarTransistor.jpg I'm pretty sure you told me that I had better remove the gold, and now I know why! Well, it's the start of another week. I'm really looking forward to tomorrow being over. I'm so sick of all the political ads I could scream! I know this is Monday, but I got sent a picture over the weekend that will start your week off with a smile. You need to look closely at all the facial expressions of everybody in the picture: http://stevezeva.homestead.com/files/Who_Brought_the_Cat.jpg Have a great week everybody! -Steve Gregory- -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Ingemar Hernefjord (KC/EMW) Sent: Monday, November 06, 2006 3:00 AM To: [log in to unmask] Subject: Re: [TN] Gold Embrittlement Agree, We degold all microwave SMT small outline transistors ("helicopters"), because we had catastrophic gold embrittlement problems. The solder joints were so brittle, that the leads lifted from the pad in the temp cycle tests. We measured as much as 15 micrometers of gold! The semiconductor manufacturer meant, that it is a problem to have control on the gold process on such small parts. What nonsense! Anyway, we are today suspiscious with many gold plated parts and do degolding rather than getting embrittlement. I'll send some pictures to Steve, so you can see what can happen. Horror! Inge -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier Sent: den 2 november 2006 23:06 To: [log in to unmask] Subject: Re: [TN] Gold Embrittlement Hi Amol, I you have imersion Au, Au-embrittlement is not a problem because there is not enough Au. Be careful, however, if your PCBs come from China; I have seen much thicker Au-layers than are possible with iAu. Calculating the wt% of Au in a soldert joint is an exercise in futility, because you have to make the assumption--frequently not warranted--that the SnAu-IMCs are uniformally distributed. In cases where you suspect thicker Au [and for the matter Ag; which is equally as bad as Au in causing SJ-embrittlement] deposits, the safest course of action is to wash the Au (Ag) off by tipping. 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