question:  if you change Au/Au coupling to Au/Pd coupling for insertion,
could you assume the same number of insertion time of the contact (Is it
once for all type or insert everyday type?  Is the Au and Pd the same
hardness?  (I am sure it is hard gold finishing).
                                 jk


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Charles Caswell
Sent: Monday, February 28, 2005 7:33 AM
To: [log in to unmask]
Subject: Re: [TN] Microcircuit Palladium Lead Finish (Good or Bad)?


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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