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73138 2005-03-08 [EE]: Soldering SMDs with heatsink..	73248 2005-03-08 Re: [EE]: Soldering SMDs with heat..
73395 2005-03-08 Re: [EE]: Soldering SMDs with heat..	73606 2005-03-08 Re: [EE]: Soldering SMDs with heat..
73698 2005-03-09 RE: [EE]: Soldering SMDs with heat..	73767 2005-03-09 Re: [EE]: Soldering SMDs with heat..

Message #73606 of 126777
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Date: 2005-03-09
From: Bob Axtell
Subject: Re: [EE]: Soldering SMDs with heatsink pads

Philip Pemberton wrote:

>Hi,
>  I'm trying to find a way to solder an SMD IC (a Maxim MAX1501 in 5x5x0.9mm 
>16-pin leadless QFN package) down, but I've hit a bit of a problem. Although
>the pins extend around the outside of the package (so they can be
>hand-soldered), I can't reach the heatsink pad that sits underneath the
>package.
>  Has anyone soldered parts like this? What's the best way to solder the part
>down *and* reliably solder to the heat tab?
>
>Thanks.
>  
>
I think the only way to do that is to have a pad with a large (1-2mm) 
feedthru on the bottom,
so somebody can force solder into it.

I tried one of these, and gave up since unless you have an xray machine, 
you can't be certain
that you have a thermal connection.

This is another of those unworkable ideas, like the Income Tax.

--Bob

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