Without knowing user environment and required contact resistance and frequency range,  life span, etc.  nothing can add here :-( sorry. 
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----- Original Message -----
From: Don Vischulis [mailto:[log in to unmask]]
Sent: Thursday, April 25, 2013 09:17 PM
To: [log in to unmask] <[log in to unmask]>
Subject: Re: [TN] Gold Fingers for Edge Connectors - Design Criteria Needed

The connector is a significant contributor to contact life; contact profile and contact pressure being significant factors.  The connector manufacturer may have data on life of plated fingers for specific configurations.

Don Vischulis

Sent from my iPad

On Apr 25, 2013, at 11:34 AM, "MacFadden, Todd" <[log in to unmask]> wrote:

> Hi everyone,
> 
> We have a new application that will require thousands of insertions on edge connectors such as you might find on mother board interconnects. This is new to us so we don't have experience or design rules yet.
> 
> Are there industry guidelines/requirements for: (1)  plating thickness and performance of hard nickel and hard gold for these types of edge finger connectors; (2) edge chamfer design; (3) finger spacing, etc.
> 
> I have seen several good supplier-specific design guidelines for edge fingers, but no industry standards yet. I know only of MIL-G-45204 for hard gold plating; is that useful in this application?
> 
> Thanks in advance for any insight.
> Todd
> 
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> 
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