[tinwhiskers] Re: Exemption on high temperature lead solder
- From: "White, Robert" <Robert.White@xxxxxxxxxxxxx>
- To: <tinwhiskers@xxxxxxxxxxxxx>
- Date: Tue, 26 Aug 2008 09:31:02 -0700
I don't think it will go away anytime soon since the exemption is also
used for die attach in high power semi-conductors used in power diodes,
IGBT's and FET's. Power supplies, as well as many other applications,
including power conversion for all the new alternative energy solutions,
require high power semi-conductors.
Best Regards,
Bob White
Director of Safety and Environmental Compliance
Power-One, Inc.
Tel: (805) 384-5391
Cell: (805) 469-4347
________________________________
From: tinwhiskers-bounce@xxxxxxxxxxxxx
[mailto:tinwhiskers-bounce@xxxxxxxxxxxxx] On Behalf Of Fritz, Dennis D.
Sent: Tuesday, August 26, 2008 9:22 AM
To: tinwhiskers@xxxxxxxxxxxxx
Subject: RE: [tinwhiskers] Re: Exemption on high temperature lead solder
What is being described here is the C4 technology of flip chips. Here
is a Wikipedia link to the description of "Controlled Collapse Chip
Connection" - the C4. High lead balls have been used in this
application since IBM invented this in the 60's, and I think this is the
basis for the RoHS exemption. Now that eutectic or SAC are being
considered, I would expect the RoHS exemption to go away.
http://en.wikipedia.org/wiki/Flip_chip
Denny Fritz, SAIC
________________________________
From: tinwhiskers-bounce@xxxxxxxxxxxxx on behalf of Mike Finczak
Sent: Tue 8/26/2008 10:53 AM
To: tinwhiskers@xxxxxxxxxxxxx
Subject: [tinwhiskers] Re: Exemption on high temperature lead solder
Niki, Bert and Ed,
Take a look at this article posted on TomsHardware regarding
Nvidia GPU failures. The failures may have been caused by
the use of High Lead solder.
http://www.tomshardware.com/news/Nvidia-GPU-failure,6248.html
Regards,
Mike Finczak
CopperCAD Design
www.CopperCAD.com
905-488-8958
-----Original Message-----
From: tinwhiskers-bounce@xxxxxxxxxxxxx
[mailto:tinwhiskers-bounce@xxxxxxxxxxxxx] On Behalf Of Parnagian, Ed
Sent: Tuesday, August 26, 2008 9:04 AM
To: tinwhiskers@xxxxxxxxxxxxx
Subject: [tinwhiskers] Re: Exemption on high temperature lead solder
Hi, Bert!
Yes, it seems inconsistent with the stated objectives of RoHS, but it is
a good example of what pushing back with data can achieve.
These high lead-content solders all have very high melting points. They
are used by device manufacturers to make internal interconnects in
devices that have very high power densities.
Best regards,
Ed
-----Original Message-----
From: tinwhiskers-bounce@xxxxxxxxxxxxx
[mailto:tinwhiskers-bounce@xxxxxxxxxxxxx] On Behalf Of Mason, Bert
Sent: 2008 Aug 26 8:32 AM
To: tinwhiskers@xxxxxxxxxxxxx
Subject: [tinwhiskers] Re: Exemption on high temperature lead solder
Abandon all rationality Ye who enter the world of RoHS and the EU.
Welcome to our world
Best Regards,
Bert Mason
Quality Engineer
Formation Inc.
Building 1
121 Whittendale Dr.
Moorestown, NJ 08057
Phone: 856-380-2956
Fax: 856-234-5242
-----Original Message-----
From: tinwhiskers-bounce@xxxxxxxxxxxxx
[mailto:tinwhiskers-bounce@xxxxxxxxxxxxx]On Behalf Of Niki Steenkamp
Sent: Tuesday, August 26, 2008 8:24 AM
To: tinwhiskers@xxxxxxxxxxxxx
Subject: [tinwhiskers] Exemption on high temperature lead solder
Hi,
I have been looking over some of the official RoHS documents and have
seen
that there is an exemption on high temperature lead solder (more than
85%
lead). Not having done any more research on the subject I was
wondering:
* Why the exemption exists?
* Why not use more than 85% lead to circumvent the pure tin problem?
Maybe
the temperature is unacceptably high?
I also noticed that mercury is limited but not banned in fluorescent
lights.
Just thinking of the millions of fluorescent lights being dumped in
landfills
each year I cannot see how this can be viewed as acceptable while ALL
lead
had to be removed from electronics. Furthermore, lead in batteries are
exempt. There is probably more lead in my car battery than in a
thousand PC
motherboards and how many of these batteries end up in landfills each
year?
Just seems strangely warped...
Regards,
Niki
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