Electronics Forum | Wed Apr 22 05:33:06 EDT 2015 | mbb
We'have been working on an issue regarding aluminium capacitor placement in PCB. In fact, we have twisted (shifted) capacitors. Through root causes analysis, we confirmed that this phenomenon is happening during reflow process (no issue on placement
Electronics Forum | Mon Nov 12 15:21:09 EST 2012 | davef
High-temp ball Sn10Pb90 + eutectic solder paste is common place for MLC reflow. Temperatures necessary to alloy the high-temp ball Sn10Pb90 and eutectic solder would be high enough to compromise interposer, board and many components. What are your:
Electronics Forum | Tue Jun 29 14:44:26 EDT 2010 | rgduval
There are some good suggestions here...reflow pallets, and copper balancing. We would also suggest verifying that your problem is not caused by moisture. How much time passed between first side and second side reflow, and how humid is the environme
Electronics Forum | Wed Oct 04 16:18:06 EDT 2006 | cw
My Peak ~ 228-230C (customer wants to see this temperature). solder ball size - 20mil diameter Please advise ASAP. Thanks a lot!!!
Electronics Forum | Fri Aug 18 03:46:29 EDT 2017 | stivais
The first reply from Tsvetan Usunov already answered your question - there are no thermals for one side of the chips. You can try to reduce the phenomenon by using different solder pastes, tuning your soldering profile or even switching to different
Electronics Forum | Fri Apr 03 08:22:36 EST 1998 | Scott Cook
| At this moment in time we are using water soluble solder paste on our PCBs these are cleaned using water only, agitated with ultrasonics. After drying a white/grey residue is left around solder joints. Reflow profile is fine and a reliable wash pro
Electronics Forum | Wed Apr 22 10:08:52 EDT 2015 | emeto
I assume you are running Lead paste and that is why your parts are moving during reflow. Most probably these caps have leads that are bended in random directions(look at some parts from the bottom and observe how symmetrical the leads are). In additi
Electronics Forum | Wed Apr 22 08:40:18 EDT 2015 | markhoch
Hi Myriam, I think we may need some more information. Is the Electrolytic (Aluminum) Capacitor placed more than once per board? If so, are all locations twisting? This would typically be caused by a thermal imbalance that could be design induced. (u
Electronics Forum | Wed Apr 22 09:32:36 EDT 2015 | mbb
Thank you for answering, Yes, we have 3 different capacitors for each daughter board with 4 boards/PCB. Another information that could help that we have the issue randomly on boards (not a specific one). The occurance of the issue is random. yes,
Electronics Forum | Wed Oct 04 16:21:59 EDT 2006 | cw
Any recommendation?
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