Since you have used press-fit connectors with ImAg in other applications, then I can assume you are using press-fits designed for thinly plated Cu barrels...
But is mil apps since the environments are typically more extreme I would consider something other than ImAg... The Press-fit will cut through to the Cu and provide an exposed channel of Cu and Ag... This gives moisture a way to penetrate not only the barrel but also the solid-solid metal joint interface from the weakest plane, the sliding plane...Mechanical movement then will leverage this plane generating micro-cracks then micro-voids which in the presence of moisture and current would cause corrosion... This will lead to joint failure, or at worst case, an intermittent failure...
I would stick with solder first then Ag-Ni...
Paul
Paul Edwards
Surface Art Engineering
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Monday, January 11, 2010 1:11 PM
To: [log in to unmask]
Subject: [TN] Using Pressfit connectors on an Immersion Silver PWB
Has anyone experienced any issues with using pressfit connectors on a
circuit board that has Immersion silver finish? Do I need to worry about
any tarnishing inside the pressfit connector holes? Since there will be
no solder, the holes will remain open, and thus I was wondering if there
have been any issues with this.
I am considering using immersion silver as a finish for a high
reliability design, and I have never had issues using it with thousands
of medical and military and other applications, including
telecommunication blades where pressfit connectors were used. However,
this is a military application, and I want to know if there are any
potential issues before I commit to using it for this application.
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