Denny,
Woah—the "engineering is done?!?"—not by a long shot.
There are no scientific reasons or other valid reasons to keep Pb-free. What do you get that is not better with SnPb? What Pb-free performance is worth the extra cost, not to say anything about the environmental damage.
Sure, it provides a lot of research grant money and work for consultants, but a bad idea is a bad idea.
Werner
-----Original Message-----
From: Dennis Fritz <[log in to unmask]>
To: [log in to unmask]
Sent: Tue, Jan 19, 2010 3:43 pm
Subject: Re: [LF] Fodder for Discussion?
Let me pose the same question I did recently in the aerospace/defense community
-
"Now that cellphone and laptop manufacturers have been exposed/adopted lead-free
solder, would they go back to leaded solder"?
I maintain that now that the engineering is done to learn lead-free, there are
scientific reasons to keep many products lead-free. Do you agree that even
though lead-free costs more per gram, there are electronics constructions where
lead-free is worth the extra cost, based on performance?
More fodder.
Denny Fritz
SAIC, Inc
-----Original Message-----
From: Marcus L. Thompson <[log in to unmask]>
To: [log in to unmask]
Sent: Tue, Jan 19, 2010 3:30 pm
Subject: Re: [LF] Fodder for Discussion?
"In my practice, over the last 15 years, the most frequent type of failures has
been SnPb creep failures in single-sided through-hole joints."
Thank you, Jean-Paul, for weighing in here. I do not doubt your experience.
However, assuming anything near commonsense design and proper assembly
techniques, I've never experienced nor heard of any such problem with Sn/Pb.
Perhaps one could say that, on balance, issues such as this were quite rare
before we had been informed of the evils of lead?
Thanks again --
--- Previous Message in This Thread ---
Subject: Re:[LF] Fodder for Discussion?
From: Jean-Paul Clech <[log in to unmask]>
To: [log in to unmask]
Date: Tuesday, January 19, 2010 11:57:13 AM
> > > Search for GPU failures and you will find that SnPb solder joints have >
failed recently aswell, in areas where SnPb products are still sold (including >
North America).
> > A few years ago (~5-7 years ago), a Danish consumer organization had a >
technical report on the internet, showing laptop SnPb solder joint >
creep/fatigue failures after < 2-3 years of use. In my practice, over the last
15 > years, the most frequent type of failures has been SnPb creep failures in >
single-sided through-hole joints. I am sure that Werner can add to the list. >
Unfortunately, the parties involved are reluctant to publish.
> > In many of these cases, SnPb or lead-free, the main issue is a lack of >
design-for-reliability (e.g. detrimental effect of stiff leads, large >
temperature swings in use, poor choice of materials etc...). These issues will >
stay, regardless of solder compositions. No doubt that the problem has been >
compounded by the introduction of new (often uncharacterized) alloys.
> > Best,
> Jean-Paul
> > > In a message dated 1/19/2010 2:01:30 P.M. Eastern Standard Time, >
[log in to unmask] writes:
> > You think the Xbox issue is the only one; laptop failures are a real issue >
as well.
> > > > > > > > Quote of the month (not necessarily monthly): > "Quality means
doing it right when no one is looking", Henry Ford.
> _______________________________________________
> Jean-Paul Clech
> EPSI Inc. -- There is no short cut to reliability.
> P.O. Box 1522, Montclair, NJ 07042, USA
> tel. & fax:+1 (973)746-3796
> _http://www.jpclech.com_ (http://www.jpclech.com/) > > -------------------------------------------------------------------------------Leadfee
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