Electronics Forum | Sat Apr 16 13:43:53 EDT 2005 | KEN
What about electo migration? I had (what apears to be) the exact same problem you describe. X-ray and ICT fails to detect micro shorts. However, in our test, the bench functional test would show a current overload. In some cases the electro migrti
Electronics Forum | Thu Apr 21 10:34:06 EDT 2005 | patrickbruneel
Hi Y'all It would be valuable to the users of this forum to get a response from the original poster about his/her findings and solutions. It usually starts with the post of a problem, then opinions and experiences get exchanged but we never see a co
Electronics Forum | Fri Sep 09 06:10:03 EDT 2016 | jswatt
the time between SMT & wave should be as short as possible but at a max it is controlled by strictest MSD part, so if you have a part with only a 48hr MSL window then it needs to be with the 48hrs. Can you post images of what you are getting? It may
Electronics Forum | Sun May 24 21:12:59 EDT 2009 | keith78
I have a problem recently to qualify QFN package on solder joint reliability. The pcb thickness stated in IPC-9701 is 2.35mm but from the in-house test, QFN surface mount on 2.35mm thickness PCB board have a short cycle to failure due to higher CTE m
Electronics Forum | Tue Mar 03 14:07:07 EST 2009 | macisaint
I'm having shorts appear on my QFN packages between pins, usually only after a week or so of power-on operation. The shorts are 1K and slowly down to hard shorts over time. Typically a defective part will have failures on multiple pins. I tried havi
Electronics Forum | Sat Dec 02 10:23:47 EST 2017 | tomh
Have you ever heard of "Solder Mask Defined Thermal Pads"? I wrote a short blurb on this here - https://www.pcblibraries.com/forum/ipc7093a-btc-qfn-solder-mask-defined-thermal-pad_topic2154.html This technology saves fabrication costs by not havi
Electronics Forum | Fri Mar 15 18:44:34 EDT 2013 | anvil1021
We will try both the solder mask and the .001" Kapton and see where we end up with each. This is a fine pitch dual row QFN and we cannot afford too much paste on the .004" stencil we are using. We have experienced shorting in the past with .005" sten
Electronics Forum | Fri Apr 13 03:20:57 EDT 2007 | bart.lozie@page.be
Hello, why focuss only on the printer and the paste, maybe the problem isn't there, maybe the problem is in the oven, is the component a havy one? because leadfree solder can't lift as mutch as a leadcontaining solder. regards Bart
Electronics Forum | Wed Jul 14 13:41:40 EDT 2010 | rway
We are running SMT products and have been for some time now. First, I wanted to check with you folks to see what an acceptable FPY rate, or what you would consider and acceptable rate, is. Secondly, we are having issues primarily with product that
Electronics Forum | Thu Aug 02 15:27:50 EDT 2012 | 15009
Solid solder deposit technology allows you to adjust alignment after placement and before reflow, without causing shorts or smearing paste. Just an idea.... www.sipad.com
