Electronics Forum | Wed Jun 19 01:07:32 EDT 2019 | relaycz
Drop of glue should prevent module from moving, but is not really a solution. What about pad design? Are pads on PCB themselves much larger then the ones on the module?
Electronics Forum | Fri Feb 18 21:34:36 EST 2000 | gwen
We always have big power modules on the board,they are very heavy,so we use the screw to fix the soldered module,then we destroyed the solder joints.If we screw them first, the board can't be wave soldered. My questions: whether we should use the s
Electronics Forum | Fri Feb 18 21:34:36 EST 2000 | gwen
We always have big power modules on the board,they are very heavy,so we use the screw to fix the soldered module,then we destroyed the solder joints.If we screw them first, the board can't be wave soldered. My questions: whether we should use the s
Electronics Forum | Thu Oct 26 14:41:33 EDT 2000 | Derek Vanditmars
We are planning on replacing a SMT 100Pin QFP with a COB module that will have two dies that are functionaly equivalent to the old part that will not be available. Questions: 1)Suggestions on substrate material FR-4 or something better? 2)Are there d
Electronics Forum | Tue Jun 18 23:24:05 EDT 2019 | SMTA-David
Hi, I have a SMD radio module that has castellated Pads along one edge of the module. The pick and place machine appears to place them very well but when the boards come out of the reflow oven then up to 20% of them have either rotated a few degrees
Electronics Forum | Wed Jun 19 17:44:38 EDT 2019 | slthomas
Does the part have a ground/thermal pad underneath or are all terminations on the perimeter?
Electronics Forum | Mon Jun 24 11:17:33 EDT 2019 | tey422
I believe you have to log in at the SMTNET.net directly in order to attach an image file.
Electronics Forum | Wed Jun 26 04:00:30 EDT 2019 | SMTA-David
Thanks, I'll take a look. Something else I found was the Z height for the module was set to 1.7mm but I am picking up the part on the PCB surface which is only 1.0mm from PCB being loaded, therefore the part must have been let got 0.7mm above PCB an
Electronics Forum | Wed Jun 19 02:42:26 EDT 2019 | relaycz
In my opinion, fault lies in printing or reflow. With printing - it's either too much solder paste or bad print, though I would assume that would be caught. With reflow, it could be that ramp up rate is too high.
Electronics Forum | Wed Jun 19 11:41:42 EDT 2019 | tey422
Here is a link of an article regarding the SMD rotation during reflow issue, you may find it useful. http://www.circuitnet.com/experts/86914.html
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