Tom,

I agree with Bruce.  AMP has many papers on connector contacts.  I will fax you what I have.
The bibliography is a good starting point.

---------------------------
John Laur
Rockwell Automation
Allen-Bradley Co Inc.                 
1201 South Second Street
Milwaukee, WI 53204
+1 414 382 2162 (fax)
+1 414 382 2393 (phone)

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Subject: Re: Tin/tin vs. Tin/gold sockets
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FROM: BRUCE HOUGHTON  27/552/844/TOR                                           
Phone  (416) 448-5701     Tie 778-5701                                         
Subject: Re: Tin/tin vs. Tin/gold sockets                                      
                                                                               
Tom,                                                                           
I suggest contacting the various connector suppliers, such as AMP              
Burndy etc and get their input on your request.  I expect they will            
highly recommend NOT mixing dissimilar metals.                                 
                                                                               
The tin will oxide and crate an increasingly higher resistance, which          
will at some point start to cause noise problems.  The two metals              
can also create an electrical potential (battery) across the joint             
which can also affect the electrical signals.                                  
                                                                               
Bruce Houghton                                                                 
Celestica, Inc.                                                                
                                                                               
Bruce Houghton                                                                 
Staff Engineer, Celestica, Inc.                                                
Internet:  [log in to unmask]                                              
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