AVR-Chat

Hi, Richard

    I have been using some QFN packages and sometimes I get shorts also... 
My solution is to use a weller Pyropen butane iron with a tip that makes it 
put just hot air out and a little SMD rework flux. I put the flux on all the 
sides of the chip and reflow it with the solderig iron... A hot air 
soldering station would probably work even better but the pyropen works 
quite well for me and is much cheaper...

best regards,
Alexandre Guimaraes

----- Original Message ----- 
From: "Richard Cooke" <rcooke@digitalwavelength.com>
To: <AVR-Chat@yahoogroups.com>
Sent: Tuesday, June 26, 2007 11:00 PM
Subject: [AVR-Chat] Placing and soldering SMD parts for prototypes - OT?


> 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
>
>
>
>
> Yahoo! Groups Links
>
>
>