Check in with Six Sigma (a division of Winslow Automation), we deal with the reballing group in Milpitas, CA 408-956-0100, and talk with them. G. VanRemortel Senior Mechanical Engineer CPU Technology, Inc ® 5731 W. Las Positas Blvd Pleasanton, CA 94588 (925) 224-9920 (Voice) (925) 227-0539 (Fax) (408) 375-4450 (Cell) www.cputech.com ************************************************ CONFIDENTIALITY NOTICE The information contained in this transmission is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. If you are not the intended recipient of this information, do not review, retransmit, disclose, disseminate, use, or take any action in reliance upon this information. If you received this transmission in error, please contact the sender and destroy all printed copies and delete the material from all computers. ************************************************ "Insanity in individuals is something rare, but in groups, parties, nations and epochs it is the rule" -Nietzsche -----Original Message----- From: tinwhiskers-bounce@xxxxxxxxxxxxx [mailto:tinwhiskers-bounce@xxxxxxxxxxxxx] On Behalf Of Bob Landman Sent: Thursday, July 29, 2010 12:40 PM To: tinwhiskers@xxxxxxxxxxxxx Subject: [tinwhiskers] Re-balling SAC BGAs Here's one bit of information: I'm planning to re-ball a new 484 ball BGA part we will be using since Lattice Semiconductor refuses to make the part in tin/lead. I have investigated the options and it is very clear to me that using tin/lead solderpaste with lead-free solderballs is a no-no. Polina Snugovsky at Celestica has studied this subject a lot and it's clear from her paper that the process reflow window is very tight (you have to raise the temp to melt the SAC balls). Too risky. http://www.hlinstruments.com//RoHS_articles/Solder%20Joint%20Reliability%20of%20Pb-free%20Sn-Ag-Cu%20BGA%20in%20SnPb.pdf Now if I can just get some parts in less than 22 weeks! Not happy about this situation; Lattice seems to have me by the ..... Bob Landman H&L Instruments, LLC -----Original Message----- From: tinwhiskers-bounce@xxxxxxxxxxxxx [mailto:tinwhiskers-bounce@xxxxxxxxxxxxx] On Behalf Of Rod Sent: Thursday, July 29, 2010 9:24 AM To: tinwhiskers@xxxxxxxxxxxxx Subject: [tinwhiskers] Re: Not receiving any email's re tin whiskers for the last two months On 29 Jul 2010, at 01:19, Randall Miller wrote: > Me neither, but I didn't notice until you mentioned it. > There are always plenty of things to occupy my feeble brain to not > notice something missing. Well, it depends on someone finding something worth saying. regards, Rod rod.dalitz@xxxxxxxxxxxxxxxx