It does better for the PCB if you use hot air, but it takes longer, and
that's longer for the heat to get to the inards of the IC, which, if you're
not inclined to save the PCB, is a good thing to avoid. BTW, with ceramic
parts, the water thing I mentioned in an earlier transimission may not be as
good an idea. I've torched many a plastic part successfully, however.
The hot air approach left me trying to aid the process mechanically,
resulting in a hellish task getting the j-leads properly aligned for future
socketing. Gull-wing parts seem to fare somewhat better, though at .025"
pin pitch it gets a mite difficult finding just the right amount of
deflections so they don't have to be nursed when resoldering them.
The manufacturers are probably not concerned about the 100 or so parts all
of us together will cost them in sales in a year as much as they're
concerned about the frustrated phone calls to their rep's or FAE's wondering
why the parts don't work the way they should.
Dick
----- Original Message -----
From: Tony Duell <ard_at_p850ug1.demon.co.uk>
To: <classiccmp_at_classiccmp.org>
Sent: Monday, June 05, 2000 6:52 PM
Subject: Re: Removing surface-mounted ICs
> >
> > >Be aware that most manufacturers do not recomend reusing desoldered
> > >surface-mount devices. That said, it seems to be possible to remove and
> >
> > Not exactly in their best interest to tell you go ahead and reuse the
old
> > parts.
>
> True, but I've never seen a similar comment in a databook or service
> manual for pin-through-hole parts. But it's in just about every
> databook/service manual/etc for SMD ones.
>
> >
> > >The best tool to use is a hot air blower. About the best sort of those
is
> >
> > Doesn't anybody have a solder pot? Thats what pretty much all the
scrappers
> > I know use to remove parts.
>
> I must admit that I've never been in the position of caring more about
> the component than the PCB. Every time I've wanted to remove an SMD part,
> it's been essential to preserve the (probably irreplaceable) PCB.
>
> Many times I've managed to separate them without damaging either part
> using the hot air tool, though.
>
> -tony
>
Received on Mon Jun 05 2000 - 23:43:28 BST