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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