[SI-LIST] connector design question

Greetings,
 

I'm designing a high speed digital connector and to meet some mechanical
requirements I am looking at a pin made of an iron alloy with gold
plating.  The gold plating will get me the required contact physics
properties for durability, contact resistance, etc.  but I got to
thinking about the iron alloy base material.

 

The self partial inductance of the contact will increase due to the
permeability but the loop inductance won't change (compared to a non
ferrous base material). And the capacitive coupling should not be
affected at all as that is driven by the potential distribution in the
pin field.  In short, I don't think the SI characteristics of the
connector are affected much by the use of a ferrous base material in the
signal pin.

 

I am not looking at this as a self equalized connector - the length is
only 0.5".  And it's not an RF connector where intermod distortion is an
issue.  That said - I figured I would get the collective input from the
group, I could use some unbiased feedback here...

 

Thanks in advance.

 

Jim Nadolny

 


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