Re: Hand Soldering


"Randy Day" <randy.day@xxxxxxxx> wrote in message
news:47252519.C712CE1@xxxxxxxxxxx
John G wrote:

"John Larkin" <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
message news:j5k9i3tucqgl7a2g99orjm5pjcv99qu48p@xxxxxxxxxx
On Sun, 28 Oct 2007 17:41:39 -0000, jsc59@xxxxxxxxxxx wrote:

I'm a EE student at Cornell working on a research project. We have
to
do a significant amount of hand soldering for the project. Which
chip
packages are hand solderable? I need to know what I can purchase
from, say, DigiKey and actually solder. Examples of packages I'm
interested in are:
* DIP
* SIP
* SOT
* SOIC
* SSOP
* TSSOP
* QFN
* TDFN

I know it depends on equipment and skill. I've done some soldering
before, but not much. We have medium quality soldering irons (not
tiny tips) and basic magnification (no microscopes).

Thanks,
-J

They're all hand solderable. The real indicator of difficulty is
lead
pitch. 50 mils is easy; 20 mils takes more care and skill, and
careful
post-inspection for solder bridges. Since you're not likely to want
to
spend a lot of time practicing, try to use dip or larger-pitch
parts
for now.

The leadless parts are a bitch, and bga's are impossible to hand
solder.

What are you building?

John

A related question from someone who only does the odd (sometimes
Very
Odd) repair these days.

Can RoHS certified components (Resistors etc) be succesfully soldered
with ordinary old solder and reasonable Weller Iron?
John G.

Absolutely. Standard solder works just
fine. You just can't call it RoHS and
sell it in Europe...

Thanks. I do not sell things anywhere, only do repairs and gadget type
things, often for disabled clients thru a Sydney Australia charity
called Technical Aid to the Disabled.

John G.


.

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