Hi Jack,

It's really important to have properly sized holes, have proper tooling, and
a proper press for press-fit applications.

If everything is done properly, press-fit connections are extremely
reliable. I've installed press-fits in military hardware more than any
other. 

It looks the connectors you've shown use displacement pin technology.
Myself, I prefer compliant pin press-fit technology though...

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Thursday, May 12, 2011 3:38 PM
To: [log in to unmask]
Subject: [TN] Under Pressure

We have a high power application where the engineers want to use press-fit
components that are like metal blocks with a grid of pins underneath that
need to be  smooshed into the board. You can see a picture at
http://frontdoor.biz/PCBportal/wurth.jpg

The manufacturer gives enough data about insertion force and max torque and
all that, but it just got me wondering... some of these devices have 36 pins
and at 250 N per pin (max) this seems like a lot of pressure. Can boards be
damaged by so much pressure? (assuming we prevent warping). Seems like there
would have to be some limit to compressive force on laminate, but I've never
heard anyone mention it.

Jack


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