Hallo Gebhard, Der Grund dafür ist, daß die unterschiedlichen Ausdehnungskoeffizienten auch ein Biegemoment erzeugen [klassische bimetallische Biegung]. Ich bin auch nicht sicher, daß Chipkondensatoren nicht Druckspannungsabhängig sind. Vielleicht sehen wir uns bei der IPC/JEDEC Konferenz in Frankfurt Ende Oktobers. ENGLISH: The reason is that the differential CTEs create a bending moment [clasical bimetallic strip]. Also i am not convinced that CCs like comressive stresses. Maybe we can see each other at the IPC/JEDEC conference in Frankfurt at the end of October. 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 --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------