QFP soldering

From: Davison, Lee <Lee.Davison_at_merlincommunications.com>
Date: Thu Jan 24 13:53:45 2002

Richard Cini wrote...

                So, here's the stupid question...how do I solder
        these things? Do I hold the iron parallel or perpendicular
        to the package leads? The board is pre-tinned, but I
        should I also tin the QFP leads?

Neither. The best way to home solder these things is to use
solder paste and a toaster oven, there's an article on
www.seattlerobotics.org on how to do this.

If you must use a soldering iron use a large bit (4.5 to 6 mm)
and run along the edge of the tinned section, not quite touching
the pins, and allow the solder to wick into the joints. Don't
worry about solder bridges, these can be removed later with
solder wick and a good flux.

If you make a complete mess of it remove the chip using a
hot air gun then clean the board with solder wick removing
any left over flux with solvent and try again.

Also use a soldering iron of at least 45W with a temperature
controlled bit.

The easiest way to practice is with the chips on scrap PC
motherboards ... see they do have a use 8^)=


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Received on Thu Jan 24 2002 - 13:53:45 GMT

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