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[DPRG] SMT Soldering
Subject: [DPRG] SMT Soldering
From: DeltaGraph at aol.com
DeltaGraph at aol.com
Date: Fri Jun 6 12:55:37 CDT 2008
Eric,
Here is a start: (2 cents from someone who is pretty new to surface mount
stuff)
I found MLFs to be real tricky -- like my first attempt (hand soldering)
failed (4mm x 4mm 20 pin)
Assembly house did some for me as a favor by dotting solder paste and
baking in reflow oven.
Might have been able to do at home. (Some people have -- search internet ).
I don't expect too many favors like the assembly house did for me so I
managed to redesign with SOIC and sleep better thinking about if I have to do
more protos -- I can do them myself.
TQFP 0.8 mm lead pitch are easy with magnification or if you are Dale Wheat
without any magnification.
Some of the finer pitch TQFPs get pretty tricky. You have to start worrying
about lifting traces if you stay on a joint too long. Brian has managed the
0.5 mm stuff. He might have some words.
For resistors:
I thought 0805s were tough until I got a good pair of tweezers now even
0603s are reasonable.
Have not ventured further down in scale -- of course mind your power
dissipation ratings as you get smaller.
If you are not pressed for space 1206 resistors are real friendly.
Watch Dale or someone skilled doing SMD asm. You will learn a lot in a short
time.
Also scan the web for tutorial videos. Utube, SparkFun....
Having the right solder is important too.
I have .015" dia 62/36/2 solder from Radio Shack that i really like for
doing tiny stuff.
I think that is the Tin/Lead/Silver ratio.
If you discover that you are really good and solder the devices that are the
size of dust particles -- always keep in mind what it will take to make some
changes to your design if you don't have the cash to run lots of proto revs
on PC boards.
Ron
**************Get trade secrets for amazing burgers. Watch "Cooking with
Tyler Florence" on AOL Food.
(http://food.aol.com/tyler-florence?video=4?&NCID=aolfod00030000000002)
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