Lieber Herr Jeremias, 1. Es ist nicht leicht ein IEC Dukument zu ändern. 2. Die meistens Länder haben eine Vertretung bei der IEC die für solche Anfragen zuständig sind. Wie ich schon früher gesagt habe, sind diese Goldgrenzen von 1,6 vol% oder 3 wt% sehr grobe Daumenanpeilungen, und Goldversprödung kann bei viel kleineren Durchschnittsgrössen vorkommen, da in den meisten Fällen das Gold nicht gleichmässig verteilt ist. Ausserdem, ist diese Goldversprödung nicht eine Ja/NeinSache sondern brigt eine absteigende Gefügeschwächung. Regards, Werner Engelmaier 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 -----Original Message----- From: Jeremias, Michael <[log in to unmask]> To: [log in to unmask] Sent: Tue, Aug 4, 2009 4:09 am Subject: [TN] FORMULA FOR DETERMINING GOLD PERCENTAGE IN A SOLDER JOINT Unfortunately, the discussion about the matter is not so serious as the problem. Proceedings in technological quality are not available by (hundreds!) of mails with ridiculous content but by hard work. 1, Who knows the responsible at IEC or TC91, who is able to change it? 2. Who is able to make thebchange request? Sincerly Michael Jeremias Industrial Engineering (OPPI41) Electronics Production ((( Defence Electronics EADS D eutschland GmbH 89077 Ulm Tel.: +49 (0) 7 31.3 92-5533 Fax: +49 (0) 7 31.3 92-73 15 E-Fax: +49 (0) 7 31.3 92-20 5533 P Before printing, think about the environment ! mailto: [log in to unmask] EADS Deutschland GmbH Registered Office: Ottobrunn District Court of Munich HRB 107 648 Chairman of the Supervisory Board: Dr. Thomas Enders Managing Directors: Dr. Stefan Zoller (chairman), Michael Hecht This E-mail and any attachment(s) to it are for the addressee's use only. It is strictly confidential and may contain legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you are not the intended addressee, then please delete it from your system and notify the sender immediateley. You are hereby notified that any use, disclosure, copying or any action taken in reliance on it is strictly prohibited and may be unlawful. - Thank you. -----Ursprüngliche Nachricht----- Von: TechNet [mailto:[log in to unmask]] Im Auftrag von Joyce Koo Gesendet: Freitag, 31. Juli 2009 19:06 An: [log in to unmask] Betreff: Re: [TN] AW: [TN] AW: [TN] FORMULA FOR DETERMINING GOLD PERCENTAGE IN A SOLDER JOINT Who ever made doc and approved it should get shot at... seriously. Not a Friday joke. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeremias, Michael Sent: Friday, July 31, 2009 12:17 PM To: [log in to unmask] Subject: [TN] AW: [TN] AW: [TN] FORMULA FOR DETERMINING GOLD PERCENTAGE IN A SOLDER JOINT Unfortunately it is not (!)=2 0a typo from me . The document DIN EN 61191-1 contains this value 2,5 µm . But I am not confident, that this is low enough for any process cases so we use for PTH the same rule as above as mentioned below Sincerely Michael Jeremias -----Ursprüngliche Nachricht----- Von: TechNet [mailto:[log in to unmask]] Im Auftrag von Joyce Koo Gesendet: Donnerstag, 30. Juli 2009 12:22 An: [log in to unmask] Betreff: Re: [TN] AW: [TN] FORMULA FOR DETERMINING GOLD PERCENTAGE IN A SOLDER JOINT Must be a typo. Should be 0.25 micron? 10 micro-inches? -------------------------- Sent using BlackBerry ----- Original Message ----- From: TechNet <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Sent: Thu Jul 30 04:26:14 2009 Subject: [TN] AW: [TN] FORMULA FOR DETERMINING GOLD PERCENTAGE IN A SOLDER JOINT IEC 61191-1 chapter 6.2.2 contains the rules < 1,4% Volume Au, < 3% Wt Au in the final solder interconnection < 2,5 µm for PTH Wave soldering (I am not confident, that this is low enough for any process cases so we use for PTH the same rule as above) You have to take into consideration solder paste volume(stencil-thickness), wetted Au-surface, wetted Au thickness Own investigations show, that Au brittelness may occure from 1,6% Vol and really will occure from 2,3% Vol. Sincerly Michael Jeremias Industrial Engineering (OPPI41) Electronics Production ((( Defence Electronics EADS Deutschland GmbH 89077 Ulm Tel.: +49 (0) 7 31.3 92-5 533 Fax: +49 (0) 7 31.3 92-73 15 E-Fax: +49 (0) 7 31.3 92-20 5533 P Before printing, think about the environment ! mailto: [log in to unmask] EADS Deutschland GmbH Registered Office: Ottobrunn District Court of Munich HRB 107 648 Chairman of the Supervisory Board: Dr. Thomas Enders Managing Directors: Dr. Stefan Zoller (chairman), Michael Hecht This E-mail and any attachment(s) to it are for the addressee's use only. 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