[TriEmbed] soldering oxidized pins - QFN part

Jeffrey Crews cruzetti at gmail.com
Wed Jan 27 10:21:06 CST 2016


It might be worth it for someone at Tri or Splat to score some "crocus
cloth." It's like ultra-fine emery (actually red rouge-impregnated stiff
cloth) usually used for polishing fine/soft metals like gold.

I used to have some and it was awesome because it didn't damage anything or
remove gold or other platings.

Come to think of it, I'll get some.

JSC

On Wed, Jan 27, 2016 at 11:12 AM, Carl Nobile via TriEmbed <
triembed at triembed.org> wrote:

> If you have some really fine non-metallized sandpaper you could give the
> part a few twists on the paper first.
>
> ~Carl
>
>
> On Wed, Jan 27, 2016 at 10:57 AM, Alex Davis via TriEmbed <
> triembed at triembed.org> wrote:
>
>> I have a QFN part which shows signs of oxidation on the pins, and I'm
>> wondering if there's anything I can or should do to clean it up.
>> Unfortunately, it's an old-stock part, so I can't just get a new one.
>>
>> I have some photos here of the part:
>>
>> https://hackaday.io/project/9150-68040-upgrade-for-powerbook-520c/log/30827-68040-has-arrived
>>
>> I am hoping there's enough un-oxidized metal on each leg that the solder
>> and flux will wet the legs properly. I'll be point soldering a few pins
>> on each side before drag soldering the rest, so I should be able to
>> evaluate if it's going to work before committing to soldering the whole
>> thing.
>>
>> Alex
>>
>>
>> --
>> "The theater of noise is proof of our potential."
>> |\ |  (¯  \/ |¯\  |V| |\ ¯|¯ |¯) | \/ | | | |¯\ (¯   /¯  /\ |V|
>> |-||_ (_  /\ |_/ @| | |-| |  | \ | /\ |^| | |_/ (_ . \_  \/ | |
>>
>> You won't find me on Facebook.
>>
>> _______________________________________________
>> Triangle, NC Embedded Computing mailing list
>> TriEmbed at triembed.org
>> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
>> TriEmbed web site: http://TriEmbed.org
>>
>
>
>
> --
>
> -------------------------------------------------------------------------------
> Carl J. Nobile (Software Engineer)
> carl.nobile at gmail.com
>
> -------------------------------------------------------------------------------
>
> _______________________________________________
> Triangle, NC Embedded Computing mailing list
> TriEmbed at triembed.org
> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
> TriEmbed web site: http://TriEmbed.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20160127/c186004f/attachment.htm>


More information about the TriEmbed mailing list