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March 2005

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From:
Joyce Koo <[log in to unmask]>
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Date:
Thu, 3 Mar 2005 08:50:22 -0500
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check electrical conductivity too.  good luck.
                    jk

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of David D. Hillman
Sent: Wednesday, March 02, 2005 7:03 PM
To: [log in to unmask]
Subject: Re: [TN] Microcircuit Palladium Lead Finish (Good or Bad)?


Hi folks! Wow, what a way to named -  "the guy who cuts up his water
pipes"! Well, its better than Doug's "It depends"! I do have some
information that might be helpful - the following info is taken from Volume
4 Materials of the Connectors and Interconnections Handbook published by
the Electronic Connector Study Group Inc. (sorry, no ISBN available) which
is a really good resource on connector materials.

- Pd wears better than Au for an equal plating thickness and can provide an
adequate end of life contact
- Pd is somewhat less galvanically active toward copper and nickel than
corresponding deposits of either Au or rhodium
- 60Pd40Ag is recognized as a good contact material for industrial and
telecommunications applications
- Pd can tarnish due to sulfur contributing sources
- Pd can form frictional polymer in sliding contact applications that are
exposed to organic vapors. The frictional polymer can increase contact
resistance.

I would recommend that you talk to the folks at Tyco or the J.M. Ney
Company - a Pd finish is being used widely in electronics applications and
you just need to confirm that your application/use environment is
appropriate. Good Luck.

Dave Hillman
Rockwell Collins
[log in to unmask]




             Charles Caswell
             <CharlesC@FESCORP
             .COM>                                                      To
             Sent by: TechNet          [log in to unmask]
             <[log in to unmask]>                                          cc

                                                                   Subject
             02/28/2005 06:33          Re: [TN] Microcircuit Palladium
             AM                        Lead Finish (Good or Bad)?


             Please respond to
              TechNet E-Mail
                   Forum
             <[log in to unmask]>
             ; Please respond
                    to
              Charles Caswell
             <CharlesC@FESCORP
                   .COM>






I don't have the spec available but I would think that Palladium finish in
a
gold socket would be fine. I would not want to solder directly to Palladium
however. Maybe Dave ( the guy who cuts up water pipes from his house! )
could
give us some insight.

-----Original Message-----
From: - Bogert [mailto:[log in to unmask]]
Sent: Friday, 25 February 2005 5:06 PM
To: [log in to unmask]
Subject: [TN] Microcircuit Palladium Lead Finish (Good or Bad)?

February 25, 2005

MIL-PRF-38535 microcircuit specification is confusing since in one section
it
identifies that to select a lead finish, include a suffix letter as part of
the part number.  The available suffix letters are Finish "A", "B", "C":,
"D"
and "X".  "D" is for Palladium.  "X" means either "A", "B", or "C" Finish

However, Appendix A of the specification indicates that only lead Finishes
"A" through "C" (or "X") are allowed.

It appears that Finish "D", Palladium finished microcircuit leads are not
allowed.  Is this true?  If so, why the apparent prohibition on Palladium
lead finish?

The question relates to selecting the lead finish for a microcircuit that
is
mounted in a socket having Gold-plated socket contacts.  Normally, one
should
specify a Gold-plated microcircuit lead (Finish "C") to mate with the
Gold-plated socket contact.  However, from a galvanic corrosion standpoint,
either Gold or Palladium should be ok.


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