Electronics Forum | Thu Jun 22 07:30:25 EDT 2017 | stephendo
Any possibility of having some changes made to the PCB for future runs? Can the ground connections be modified to have thermal relief patterns? At one time occasionally people would come to me to tell me that the power was out at their work station
Electronics Forum | Thu Jun 22 10:33:03 EDT 2017 | charliedci
We are changing /adding a lead free wave. This will either be a conversion of a leaded wave or a new purchase. Nitrogen seems to be a necessity in selective soldering lead free, should I presume the same for a wave process? I am interested in first h
Electronics Forum | Tue Jul 04 14:50:52 EDT 2017 | dleeper
Thanks! good stuff. I am disappointed the IPC has put off updating QFN solder filet specs till rev H. It's a pet peeve of mine trying to argue with customers that a visible toe filet on a QFN is not necessary, and may not even be possible depending
Electronics Forum | Thu Aug 31 09:11:53 EDT 2017 | hxamalia
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Electronics Forum | Wed Jul 05 11:25:10 EDT 2017 | davef
You've posed a very broad question, I'm not sure what you're asking. As a starting point ... Kester reported “The Effect Of Metallic Impurities On The Wetting Properties Of Solder“ [http://www.smtnet.com/library/index.cfm?fuseaction=view_article&art
Electronics Forum | Sat Jul 22 11:38:18 EDT 2017 | vchauhan
We normally do reflow profile on non-populated solder sample board. We do use some critical component like BGA and put thermal couple underneath. I need your expertise. How much will it drop in peak temperature when we will be running populated board
Electronics Forum | Mon Jul 24 09:15:32 EDT 2017 | davef
James: This is not "breaking news." IPC-A-610F, Acceptability of Electronic Assemblies was released in July 2014. Both, ... * IPC-A-610G, Acceptability of Electronic Assemblies * J-STD-001G, Requirements for Soldered Electrical and Electronic Assem
Electronics Forum | Wed Aug 09 14:55:42 EDT 2017 | cbeneat
Trying to show documentation/expert opinion to an operator or 2 why it's important to not let a first piece, that they so diligently built for the next shift to let sit for an hour, why that's not a good idea...other than me telling them so. And tel
Electronics Forum | Mon Aug 14 15:09:14 EDT 2017 | charliedci
In my experience, in a temperature/humidity controlled environment, 1 hour, no big deal. 4 hours still ok. Overnight your pushing the limits but will probably reflow without issues. Any longer, could be a problem. Again, a lot depend on type of past
Electronics Forum | Mon Aug 14 15:00:46 EDT 2017 | charliedci
We run a "no clean" soldering process, class II primarily, conformal coating using a Humiseal acrylic coating, applied by machine and by brush. We have seen very few coating issues in my 10+ years from contamination by body oils. We are not using glo
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