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To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] handsolder QFN packages
Date:	Wed, 22 Mar 2017 14:00:51 -0400
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Reply-To:	geda-user AT delorie DOT com

On Wednesday 22 March 2017 13:25:51 karl AT aspodata DOT se wrote:

> Is it possible to handsolder QFN packages, something like [1] ?
>
> Hälsningar,
> /Karl Hammar
>
> [1] http://assets.nexperia.com/documents/data-sheet/PUSB3FR4.pdf
>
I think a reflow oven would be faster, and there are numerous diy 
instructions on the net as to how to do this with a modified toaster 
oven. You would have to start with a scrubbed clean pattern on the 
board, anointed with a drop of solder paste, place the device on the 
paste in about the correct position and heat. The reflow is a wetting 
process by the solder, and it will suck a minor miss-alignment with the 
conductor pads into near perfect alignment as the solder "wets" the 2 
surfaces.

The modification parts may cost more than the basic oven, its a $20 bill 
at Walmart. You'll need to replace the mechanical temp controls with an 
SSR and a timer so it can reach a higher temp for a short time.

How much is that device in 100's? I may have a place for quite a few.

> ----------------------------------------------------------------------
>- Aspö Data
> Lilla Aspö 148
> S-742 94 Östhammar
> Sverige
> 0173 140 57


Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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