Re: Soldering surface mount components
From: Leif Erickson (pcboards_at_onemain.com)
Date: 12/03/04
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Date: Fri, 03 Dec 2004 04:51:49 GMT
Watson A.Name - "Watt Sun, the Dark Remover" wrote:
> "Howard Long" <howard@howardlongxxx.com> wrote in message
> news:comr7t$441$1@sparta.btinternet.com...
> [snip]
>
>
>>>I think I also need a smaller soldering iron tip - the last one was
>
> still
>
>>>too big and bulky with a 1 or 2 mm point.
>>
>>Here's the iron I use
>>
>
> http://www.maplin.co.uk/Module.aspx?ModuleNo=10271&TabID=1&source=15&Wor
> ldID=9&doy=2m12
>
> I read the text in that ad three times, and I still couldn't find
> anything that said what the wattage was. Why would they leave out
> someething so important?
>
>
>>I use the same sized tip that was supplied with the iron - it's pointy
>
> but
>
>>not miniscule.
>>
>>Cheers, Howard
>
>
>
Hi there Jack
Check out http://protoboards.theshoppe.com/articles.html
for some soldering advice. There is a basic soldering and SMD article on
there, and SMD breadboards.
You should be able to put the chip on by hand. I do.
1.You need a good HANDS FREE magnifier, one of them geeky head set
flip-up magnifiers. OPTI-VISOR is one I use, and can get different
lenses for them and has a little monacle magnifier that you push over 1
eye to see even closer. A bench mounted, spring folding magnifier and
lamp combo can work, or a goose neck one with a heavy base. You got to
have both hands free to see, and work. Do not try them stupid little
tweezer/magnifier combo deals for $3-5, they are worthless. And you
usually are not lined up to see into it while soldering.
2. Get a low wattage iron, 10-20 Watts, or so. Don't need a lot of heat
for the chips. Ebay has Metcal MPX style soldering iron sets with a iron
and a stand. They are first or 2nd generation now, but still way better
than ANYTHING on the market for soldering. 5-10 second warm up times.
2nd generation power supply unit has 2 iron connectors! 1st gen. has
only 1 iron connector on it. They all use the same type of tips, and can
get IC size tips, 0603-1210 size tips, many other special ones. What you
need for IC's is a HOOF tip. Its an angled tip, with a depression in the
end, to hold some solder.
3. Tack solder the chip on 1 corner. Put TINY bit of solder on a corner
pad. Get chip in right PIN #1 Position FIRST. AFTER getting the chip in
place, REGISTER the corners and sides so ALL the pins line up. If some
are bent, use the tweezers you have to move them. OF COURSE YOU ARE
WEARING A WRIST STRAP ON AN ESD MAT!!!!!
Solder 1 corner, and make it quick, no more than 5-7 seconds on a pad.
RE-REGISTER THE OPPOSITE CORNER, and solder it down. CHECK ALL PINS
BEFORE COMMITTING YOURSELF!! Then use a lot of flux, preferably from a
flux pen, and coat the pads and pins good. Then with a WELL TINNED TIP,
put a small bit on the tip, put it on one side of the pins, and
LIGHTLY!! DRAG IT ACROSS PADS/PINS to the end. If not enough solder on
the side, do it again, AFTER fluxing a little more. Flux should keep the
shorts from happening, if you go fast enough, too slow and it may leave
a blob on 2-3 pins. Not to worry. Finish up all sides of chip.
4. FLUX again - Then go back with fine tip and try to drag the blob over
2-4 pins or so, to get rid of short(s). With FINE PITCH 0.8/0.5 mm QFPs
and such, just be a little more careful with pressure on pins. For the
0.5 mm you will need a good magnifier. You can also use the desoldering
braid, SODER-WICK, or some type of braid to pull solder shorts off pins.
5. You WILL need a good magnifier, a DECENT iron and different types of
tips, 1-2 different type of tweezers, and a flux pen for all SMD type
soldering. I have a bent fine point pair of tweezers, for the tiny stiff
and picking up QFP's by 1 pin! And a thicker, straight utility pair,
with square tips for bending the wires, or getting a better grip, and
general use, as its a heavy pair. Contact East, Techni-tool, or any
electronics catalog should have what you need. Some tools may cost, like
the tweezers, but they are for life, unless you drop the fine tip one on
the floor!
Hope this helps out.
Leif Erickson
- Next message: Larry Brasfield: "Re: Soldering surface mount components"
- Previous message: Pat D.: "Re: Manuals in pdf form for the Data I/O 29b, unipak 2b, gangpak, and Logipak with 303A-002 Programming/Testing Adapter."
- In reply to: Watson A.Name - \: "Re: Soldering surface mount components"
- Next in thread: Ian: "Re: Soldering surface mount components"
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