[time-nuts] RoHS Solder

[Pete Lancashire]

Another article I will see if I can find it took a different
slant. Since it can take two to three years for a whisker to
grow enough to cause a short. It is a big plus for the
consumer industry. Finally a built in failure mechanism to
force the consumer to have to buy again, and again, and again.

-pete




> Hi,
>
> yes, tin whiskering is a huge issue. Wikipedia has some nice (and
> shocking) pics on it.
>
> One of the best sources of information is the Nasa Tin Whisker page:
>
>    _http://nepp.nasa.gov/whisker/_ (http://nepp.nasa.gov/whisker/)
>
> bye,
> Said
>
>
>
> In a message dated 9/24/2009 06:15:04 Pacific Daylight Time,
> wpxs472 at gmail.com writes:
>
> Interesting comments regarding. lead free solder. I was not aware of  the
> tin
> whisker problem. We went lead free here at work several years ago.  I
> really
> don't like the lead free solder we have to use on several  accounts. As
> mentioned, you don't get nice shiny joints. They look pretty  much like
> cold
> joints. We had to do some rework on some products and the  lead free stuff
> doesn't rework well at all. We ended up having several  field failures.
> Not
> good for customer relations. The processing  temperatures are much higher
> than with eutectic and sometimes the boards  come out of the oven all
> brown
> and crispy. Good thing most of what we make  gets molded in plastic. I
> don't
> use lead free in the lab. One of the many  reasons is to keep customers
> from
> putting engineering samples in equipment  to be sold.
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