Joe,
The articles are dealing with "pure tin". What is pure tin? Is the
99.3%Sn/0.7%Cu considered pure tin? What about the 95%Sn/4.3%Ag/0.7%Cu?

Regards
Ofer Cohen
Quality Assurance Manager
Seabridge Ltd.


-----Original Message-----
From: Joe Zaccari [mailto:[log in to unmask]]
Sent: Tuesday, June 10, 2003 2:43 PM
To: [log in to unmask]
Subject: Re: [LF] article and research request


Hello,

I can comment on one potential problem that you or your customer may see
with the lead-free component if the lead finish is pure tin, that being tin
whiskers. I don't know if you're familiar with the tin whiskers so I will
give a brief summary and links to sources of more detailed information and
references.

While pure tin is a lead finish that has existed in the electronics industry
for decades, there is a well known phenomenon related to pure tin leads
called "tin whiskers." These tin whiskers are conductive pure tin crystals
that "grow" from a component lead. These whiskers can bridge to near-by
conductors causing a range of failures in mission critical systems.

These are two sources for tin whisker information that I find most useful:

http://nepp.nasa.gov/whisker

http://www.calce.umd.edu/lead-free/

Hope this helps in your research.

Best regards,
Corfin Industries LLC


Joe Zaccari
Military Programs and Sales Manager

603-893-9900 Office
603-893-6800 Fax
603-498-7854 Mobile


-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of H. Molema
Sent: Tuesday, June 10, 2003 6:38 AM
To: [log in to unmask]
Subject: [LF] article and research request


Hello,

I have been asked to do research on the following subject. At this moment
we are still wave soldering and reflow soldering with sn/pb. I would like
to know what could happen with the solder reliability when we get one
component on a board that is lead free while all the other components and
the PCB are sn/pb and we are going to solder the board with sn/pb using a
solder profile for sn/pb. Is the reliability of the solderjoint an issue?
Can anybody tell me were I can find any articles or research on this
subject, I wasn't able to find much on this specific issue.
Any help is appreciated.

Kind regards,

H. Molema

VariAss Electronics BV
Supplier of Industrial Electronics

E-mail   : [log in to unmask]
Tel.     : +31 (0)598 619475
Fax      : +31 (0)598 613538
Website : www.variass.nl

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