Electronics Forum | Thu Nov 03 04:31:21 EST 2005 | arnold
davef, how can you convince me that 100Sn dissolved copper much faster?
Electronics Forum | Wed Aug 27 00:20:38 EDT 2008 | rameshr
Dear davef, Will u pls advice what are all the possible defects caused while soldering ( assembling ) this type of boards.
Electronics Forum | Sat May 02 23:31:06 EDT 2009 | kareal
Thanks davef. The defect always occurred during UHAST reliability, but not find in reflow. The key is that there is tin diffuse to copper trace under solder mask. is it a "normal" board defect and what is the potential risk for device? thanks!
Electronics Forum | Fri May 08 04:39:32 EDT 2009 | kareal
Hi Davef, I want to explain that the tin diffusion in my project is not on solder bump/Pad region. It is on copper trace between bumps. so it is very wondering for me.
Electronics Forum | Wed Aug 26 20:58:52 EDT 2009 | mika
Hi, Just as DaveF said; please give us some more information. It could be a a´lot of things. For .ex. Do you by any chances solder with Ni/Au at the board?
Electronics Forum | Fri Oct 30 08:24:12 EDT 2009 | rajeshwara
thnx davef & all With the help of all at last i solved the problem , The vias are not caped from bottom , so solder paste draining through the via to the floor which creates voids between IC ground pad and e-pad. Tnhx all again
Electronics Forum | Fri Feb 15 14:45:30 EST 2013 | davef
Yes, the standard applies to things that are soldered. Read this ipc.org/TOC/J-STD-002C.pdf BR, davef
Electronics Forum | Mon Jul 01 15:40:12 EDT 2013 | davef
Walter: The things I'd look at first are: * Temperature of the water wash. I expect the solution to be in the 140-150*F range [Check with your flux supplier for recommended temperatures] * Temperature of the boards when entering the cleaning process.
Electronics Forum | Mon May 19 15:13:05 EDT 2014 | davef
Consider this combination: * IPC-7351B - Generic Requirements for Surface Mount Design and Land Pattern Standard * IPC Tools & Calculators [ipc.org/contentpage.aspx?pageid=PCB-Tools-and-Calculators ] * Component fabricator suggestions BR ... davef
Electronics Forum | Mon Jun 02 20:38:42 EDT 2014 | davef
I believe that you get better responses when you start a new thread, but that's just an opinion, not a rule. BR ... davef
