thanks! Werner The ball material of the BGA is SAC-305. Which should I choose to use as paste for high reliability between SAC305,SAC405,SAC105,and leaded tin? hechong Werner engelmaier <[log in to unmask]> 发件人: TechNet <[log in to unmask]> 2008-12-09 07:28 请答复 给 TechNet E-Mail Forum <[log in to unmask]>; 请答复 给 Werner engelmaier <[log in to unmask]> 收件人 [log in to unmask] 抄送 主题 Re: [TN] ??: Re: [TN] BGA soldering open issue Hi Victor, Normally these pics open--now I am on the road and things get even more difficult. It is not the weight but the different thermal expansion of the various BGA ayers. Werner -----Original Message----- From: [log in to unmask] To: [log in to unmask] Cc: [log in to unmask] Sent: Sun, 7 Dec 2008 1:29 pm Subject: RE: [TN] ??: Re: [TN] BGA soldering open issue Werner, ? ?? I was unable to open the file.? ?I can see the borders.? ?I too was not aware that attached H/S could cause solder bump open issues. ??What is the least recommended H/S weight that would not cause a BGA solder bump issues? ??Can you share supporting data/documentation/case study? ? Victor, ? From: [log in to unmask] [mailto:[log in to unmask]] Sent: Friday, December 05, 2008 3:37 PM To: Hernandez, Victor G; [log in to unmask] Subject: Re: [TN] ??: Re: [TN] BGA soldering open issue ? Hi Victor, Here it is: Werner --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 -----------------------------------------------------