August 14, 2007 Good question. I also need info in this regard for SAC for all type of component leads/terminations that may be finished with SAC. Is it better from a reliability standpoint to just live with a SAC finish for SnPb assembly level soldering, or otherwise re-work the components to replace the SAC with SnPb? Are we at the point yet where we can reliably predict equipment life in the field for SAC alloy as compared to SnPb alloy? I have need seen any widely accepted industry papers yet that equate accelerated life testing results to expected product fieldlife using SAC alloy. On a related issue, for pure tin, I understand that NEMI is not endorsing it unless there is a nickel under-plate. Just annealing after plating for pure tin plated parts is not acceptable per NEMI recommendations. I believe Dave Hillman of Rockwell published some data regarding soldering to SAC with SnPb solder. If you get any info on SAC or pure tin plated leads/terminations, I would appreciate it if you could forward to me. Thanks. Seems like when I post a question to Tech-Net, I get very few answers. Could be my questions are difficult to answer. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Bloomquist, Ken Sent: Tuesday, August 14, 2007 4:51 PM To: [log in to unmask] Subject: [TN] SAC Soldered With SnPb We are a Class 3 manufacturer and are looking at the different lead finishes that can be soldered successfully with SnPb. One that we are having a hard time finding information on is SAC lead finish soldered with SnPb. I know that it's not good practice for BGA's but what about SMT and through-hole parts? Thanks in advance, KennyB --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------