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Mail Archives: geda-user/2017/03/22/13:51:37

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From: "Bob Paddock (graceindustries AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Wed, 22 Mar 2017 13:50:33 -0400
Message-ID: <CAOuGh89BdgtaXDbbRehKzoo5dxEPgSj+Z7b0VM_ngQ8tcfcuRQ@mail.gmail.com>
Subject: Re: [geda-user] handsolder QFN packages
To: geda-user AT delorie DOT com
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On Wed, Mar 22, 2017 at 1:25 PM,  <karl AT aspodata DOT se> wrote:

> Is it possible to handsolder QFN packages, something like [1] ?

With a Hot Air iron, yes.

With small tipped iron the odds are dicey of it it working.

A lot of QFN parts *look* like the pads extend to the edge of the part
when they really don't..
So it can *look* like a good connection to *nothing*.

QFN parts are really bad to use if designing low current products
because they can be hard to get the flux out from under them.
The inert flux can build up contaminants over time leading to rising
currents.  A Bad Thing in a battery powered device.

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