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 (!) a 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 92-5533 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. 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