Electronics Forum | Mon Oct 19 15:43:37 EDT 2009 | dilogic
We have a problem with QFN IC's with NiPdAu plated pads. Our ULC's don't see the pads due to the almost ideal reflection. Vision sees the pads almost black. As we don't have OAL-cameras (which can help in this case, I assume), I am thinking of back-l
Electronics Forum | Wed Jun 18 18:24:07 EDT 2008 | jensteele
Does anyone know of an established guideline for thickness requirements? Our smaller pads continue to receive a thicker solder deposition when we measure by the larger pads for process accessibility and vice versa for the larger pads when we measure
Electronics Forum | Thu Jun 19 20:52:19 EDT 2008 | davef
Please give us more information about the source of the solder that you mention. Is it: * HASL applied by your supplier * Solder on pads after wave soldering * Solder paste after printing * Solder on pads after reflow soldering ... or what?
Electronics Forum | Mon Apr 27 02:44:07 EDT 2009 | michafogel
Can someone point me to a standard, if there is any, or design rule regards with preffared spacing between PTH and SMT pads for LF wave soldering process (SAC alloy)
Electronics Forum | Thu Apr 30 22:40:32 EDT 2009 | davef
Selective Wave Soldering DoE to Develop DfM Guidelines for Lead and Pb-Free Assemblies Written by Makram Boulos, Craig Hamilton, Mario Moreno, Ramon Mendez, German Soto and Jessica Herrera Circuits Assembly Magazine, 31 December 2008 19:00
Electronics Forum | Thu Apr 30 06:14:26 EDT 2009 | michafogel
Thanks , I'll try it too.
Electronics Forum | Fri May 01 06:49:31 EDT 2009 | davef
minimum space between selective wave soldering pallet's opening to the nearest PTH or SMT pad? * http://www.agicorp.com/pdf_files/Designguidelines903.pdf * http://www.datumdynamics.com/resources/dfm_wavesolder.html?PHPSESSID=a73b3bc8bbd55519bffbb68
Electronics Forum | Thu Sep 30 11:30:46 EDT 2010 | babe7362000
Take a few parts from the reel and look close at > the parts to make sure the bottom surface of the > leads is below the bottom surface of the body. Yes I did that and they are below the body. I found the problem I think. The solder mask is abo
Electronics Forum | Wed Sep 29 08:26:03 EDT 2010 | babe7362000
We are Currently running a Board and it seems that the SOT-223's on the bottom side have flux and water trapped under the part. Nothing has changed in our process and this is the only board that it is happening on. We are using Kester R562 water wa
Electronics Forum | Thu Apr 30 02:39:48 EDT 2009 | michafogel
Thanks for the info so far, but still need a number or a formula to calculate. The site you have point me to can support in a way, but if I want to release a design procedure to our editors, a number will be very helpful. One more issue is what can b
