| Any tips on soldering surface mount components? have some BC847
| transistors to solder and they are about the size of a gnats butt with
| six pins, only need to solder three pins but even this is a
| micro-surgery job,
| regards, Terry
Use a small 25 watt iron, Tin the pads with a good rosin core solder,
ditto for the leads and then you don't have to put too much heat into
the circuit board. A touch will do it.
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Usually what I do, when we are hand stuffing a prototype, is to pick a
leg, presolder that spot on the PCB, move the part over the pads and
reflow that one spot. You are basically tacking the part down by one
leg. If the part shifts, reheat and move. I use a very sharp pick to
press down the center of the part. Then VERY carefully solder the other
legs. If you short anything out (look at it with a magnifier) use some
desoldering braid to pull off the excess solder. I have done some
pretty small stuff that way. Solder paste is only really useful if you
have a part stencil and are going to use an oven. Otherwise, you are
just blobbing the paste on and hoping for the best, so you might as well
use some liquid flux and REALLY thin solder. I use .020" which is still
kinda' big for some things, but I get by.
On Wed, 11 Apr 2007 12:04:44 +0100, Terence Lynock (MSW)
Dead easy, I now MUCH prefer them to leaded comps. What you do need
A fine pair of tweezers.
A magnifying glass.
A fine tipped iron.
Good flux. I use Ersin RMA.
Fine solder, I like Alpha .020"
The process is:
Pre-tin the copper pads with a little solder.
With the tweezers, pick up the part and smear a little flux on the
leads ( I put a tiny drop on an old microscope slide for this)
Position the part on the pads.
Tack down one lead to the board.
Push it about as required (but just a little !) to centralise it on
the rest of the pads
Then go around and solder down the rest of the pads, and reflow the
Clean off surplus flux and inspect under the light and magnifying
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