X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Authentication-Warning: envy.delorie.com: dj set sender to dj AT delorie DOT com using -f From: DJ Delorie To: geda-user AT delorie DOT com Subject: Re: [geda-user] handsolder QFN packages In-Reply-To: <20170322172551.DF40C8106DD0@turkos.aspodata.se> (karl@aspodata.se) Date: Wed, 22 Mar 2017 14:27:17 -0400 Message-ID: MIME-Version: 1.0 Content-Type: text/plain Reply-To: geda-user AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: geda-user AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk I've done bottom-only QFNs with a hotplate and by hand; the trick is to design the footprint so that the pads extend out past the edge of the part far enough to get your soldering iron in there. Use extra solder (or put paste on the pcb and reflow with your iron) and use the extended pads to drag the excess solder away from the part. I think the best approach with an iron is to put paste down, then the part, hold it in place with some sort of "third hand" (tape or a weight), and use the iron to reflow the paste. And I can't find a photo online of what I'm talking about, so: http://www.delorie.com/pcb/soldering-tricks/