Hi Rex, Please be careful about the following: (1) equating relative performance in accelerated testing to relative reliability performance—this is a classic apples v. oranges comparison; (2) making a 'uniform' alloy from mixed SAC/SnPb solder combinations requires at least SAC reflow temperatures and more time than soldering just SAC; (3) drawing any conclusions from one set of test results is quite 'dangerous' for Pb-free solders. Werner -----Original Message----- From: Rex Waygood <[log in to unmask]> To: [log in to unmask] Sent: Tue, 21 Oct 2008 12:08 pm Subject: Re: [TN] Lead Free BGA'S There is an NPL report that shows that this could be more reliable in thermal cycle than either all SAC or all SnPb with the balls having reflowed to produce a 'uniform' alloy. Obviously making an assumption that some other BGA, thermal cycle routine, pad size etc will be the same has risks but it was a good report. From memory the NPL under BGA temp was 217C. Rex Waygood Technical Manager PartnerTech Poole Ltd Benson Road Poole Dorset BH17 0RY United Kingdom Tel: +44 (0)1202 674333 Fax: +44 (0)1202 678028 DDI: +44 (0)1202 338222 Mob: +44 (0)7887 997403 [log in to unmask] www.PartnerTech.co.uk -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of John Foster Sent: 21 October 2008 16:21 To: [log in to unmask] Subject: [TN] Lead Free BGA'S Our assembly house recently assembled some boards with Lead Free BGA's for us and when I asked them if they=2 0used a lead free process they responded with. We use leaded solder (Sn63Pb37) with a hybrid oven profile to accommodate the lead-free BGA. I hope this answers your question. Please let me know if you have any more questions." Is this a common process, is this a reliable process Any input is appreciated Thank You John Foster --------------------------------------------------- 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 ----------------------------------------------------- ------------------------------------------------------------------------------- The information contained within this e-mail and any attachments contained therein may be confidential and/or legally privileged and is for the use of the intended recipient only. If you are not the intended recipient please delete it from your system and notify the sender by return e-mail. The content of this e-mail may not be copied or disclosed to any third parties without prior permission from the sender. E-mail is susceptible to data corruption, interception, tampering and viruses. We do not accept any liability for any such incidents or any consequences thereof. --------------------------------------------------- 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 -----------------------------------------------------