[sdiy] SSI2130

Roman Sowa modular at go2.pl
Thu Sep 17 10:36:21 CEST 2020


Put flux gel on the pads generously, then place QFN part. The gel 
refracts light so when you push it down and look from top you can 
actually see 4 sides of the chip at once. Depending on microscope 
magnification.
The toughest part is to align it properly. Seeing all 4 sides at once is 
very helpful to do that. Tack the chip at one side, wherever, just to 
secure it in place. Then look at the chip at different angles to see 
better how it aligns with pads. If not, melt the solder and move the 
chip slightly in desired direction. Check again. And then solder side by 
side, obviously starting at the side which was not tacked.
I use 2mm bent chisel type of tip for that. But any kind of sharp chisel 
is OK. Also tried with "hot knife" tip, also works, maybe even better, 
but not my thing.

Roman


W dniu 2020-09-17 o 09:28, masaji yoshitake pisze:
>  > QFN yeah!
> How do you solder QFN?
> Most of guys struggle to solder QFN.
> 
> Masa
> 
> 
> 2020年9月17日(木) 15:04 Roman <modular at go2.pl <mailto:modular at go2.pl>>:
> 
> 
>     Dnia 17 września 2020 00:16 Tom Bugs <admin at bugbrand.co.uk
>     <mailto:admin at bugbrand.co.uk>> napisał(a):
> 
> 
>         QFN hmm!
> 
> 
>     QFN yeah!
>     someone's pain is someone's else's pleasure
> 
>     Roman
> 
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