Electronics Forum | Mon Jul 26 19:32:03 EDT 1999 | Steve Gregory
| Can anyone give me the virtues of SMT package castellations vs. no castellations with particular reference to the ruggedness and reliability of the solder joints? Any references or studies that you can point me to? Also, although I'm in favor of
Electronics Forum | Thu Jun 09 20:16:28 EDT 2022 | llawrence
Hi, We are producing a board that contains an RN4678 bluetooth module, and an STLINK-V3MODS module, both of which are castellated modules. I am constantly having issues with the modules being soldered to the PCB incorrectly. It seems that the RN4678
Electronics Forum | Thu Dec 14 21:54:50 EST 2000 | Joseph Scott Dowsett
I am student at Northern Illinois University and am doing a senior design project on applying castellated solder pads (pads on the side of the substrate) to a hybrid circuit. I have had difficulty finding related articles. I found this website and
Electronics Forum | Fri Dec 27 13:16:18 EST 2019 | slthomas
Can you describe the failure mode of the soldering defect, i.e., is it failing to meet the height requirement for a castellated termination due to not wetting of the component terminations, or not wetting the pads sufficiently, or....? We install a
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 Feb 09 10:34:19 EST 2005 | Ron
Is anyone currently reflowing a board with SC44 devices on it. This is a 6pin SAW filter with castellated terminations. I'm looking for a solder paste design for this part. I currently use a laser cut 6mil thick stencil.
Electronics Forum | Fri Jun 21 02:11:27 EDT 2019 | alanyang
Many aspects cause such problem, stencil windows and thickness, thermal pad and crowded PTH vias on PCB, the castellated pad size and pcb pad size. Do you have picture for reference?
Electronics Forum | Fri Jun 10 17:55:16 EDT 2022 | jdengler
Generally we overprint on the exposed part of these pads. When there isn't enough clearance at the end of the pad we place solder preforms with the placement machine. Jerry
Electronics Forum | Fri Jun 10 19:02:57 EDT 2022 | llawrence
Yes they are far from ideal. What do you mean by profiling on the problem leads? And yes there is a lack of solder on some, but there are no vias in or near any of the pads that could be stealing solder
Electronics Forum | Fri Jun 10 19:05:23 EDT 2022 | llawrence
Overprint, that is putting extra solder on with the stencil that is even further out from the pads, with the idea that it will suck that solder up during reflow? I could give that a try. Are there any general recommendations when overprinting? And wh
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