AVR-Chat

I do this stuff everyday at work. It even works on QFP100 and bigger 
with 10mil pitch. Place your part on the board, hold the center down 
with your finger. Place flux at four spots, one on each side and 
touch with a clean iron to tack and hold it there. next, flux all for 
sides with liquid (water soluble flux), place a small amount of 
solder on the tip of your iron and using the weight of your iron ONLY 
(do not put any extra pressure or you will bend pins) and drag from 
one side to the other. if done right you can, or I can, solder the 
whole thing in 15 seconds.

--- In AVR-Chat@yahoogroups.com, "Richard Cooke" <rcooke@...> wrote:
>
> Hi Folks,
> 
> Up until today, I've been fairly successful in soldering SMD parts 
for
> my prototypes but it looks like I've got a short in one of the QFN32
> parts.  How do you place them?  I guess my hand shook a bit when I 
was
> placing the thing and now one of the Vcc pads are shorted to a GND 
pin.
> 
> I've managed to get the 0603 parts down without much problem but 
this
> QFN32 part is tough.  I've placed the ATMEGA48 (TQFP package) and it
> soldered fine.
> 
> I'm looking for some suggestions/words of wisdom on what other folks
> do for their prototypes.
> 
> Thanks,
> 
> Richard Cooke
>