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From: "Da Man"
References: <email@example.com> <6569068.6Fu6OfrFU8@mixdown.org>
Subject: Re: Total lack of response re SMT query - What gives ?
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Date: Tue, 31 Dec 2002 23:59:32 GMT
NNTP-Posting-Date: Tue, 31 Dec 2002 19:59:32 AST
That's how I do it (only I don't use solder wick, I flick the iron clean and
let the excess solder flow on it, sometimes standing the board on it's edge
to help the solder to flow back on the iron)! Works great! I can do most
large IC's in under 1 minute.
"Andrew Kohlsmith" wrote in message
> > I do not like to work with chip so small unless the design requirements
> > dictate this route! SMT is super hard to work with in the prototype or
> > bread board stage. Damned solder drpis all over the leads and all at
> > once!
> Slow down, cowboy. I solder TSSOP and PQFP parts by hand without (too
> trouble. Solder wick is amazing (get good quality stuff, and a hot iron)
> at correcting fine-pitch mistakes, and low-solids flux is essential at
> preventing soldering errors.
> I used to prototype PCMCIA cards when I was 19 -- a 204 pin PQFP took 10
> minutes: flux pen all the pads for the chip (just like a highlighter -- 4
> wipes, once for each row), then place the part. Get a bit of solder on
> iron and touch down a corner. Do the opposite corner. Now blob up solder
> to cover 3-4 pins on one row. Flux pen again. Nice and wet. Now drag the
> iron across the entire row -- the solder will follow, leaving the exact
> right amount at each pin. You may have a bit of cleanup to do at the last
> pins, but that's it. Use a dentist's pick and rake it across to make sure
> you got a good solid connection.
> The trick was the angle to drag the iron. I destroyed 2 parts before I
> it right.
> Nowadays (I'm 26) I can't do it in 10 minutes, but I can get it done in
> under half an hour. I don't rake the iron across because I usually don't
> have spare parts, but I use my iron with a tiny bit of solder and touch
> down a pin, then then the next and so on... Always putting solder on the
> iron and never trying to solder down a pin in the traditional manner.
> I use a standard Weller iron (the magnetic tip temp control, 700oF tips (I
> think) -- I believe my tip of choice is the conical fine-pitch (1 or
> 1206 and 0805 parts aren't a problem at all, nor are most ICs and SOT/SOD
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