Steve,
I would recommend against the practice because sometimes it works and 
sometimes it don't.  You are not going to get as good a contact between 
the pin and the hole if you have coating smeared along the pin from the 
insertion process.  I looked at it one time for our processes and got 
mixed results.  If you ever have to solder the pins for any reason, the 
residual coating will interfere with hole fill.  Also, the way we 
manufacture, the press fit connectors go on early in the process.  The 
thought originally was to have conformal coating between all the pins to 
better protect against moisture.  But with insertion happening early in 
the process, then you had to worry about the compatiblity of the coating 
with ALL of the manufacturing fluids in the subsequent processes.  I have 
discussed this practice with my counterparts at companies that make really 
big planes (won't say who, but rhymes with Loeing and Lairbus) and they 
also feel that this creates a less than reliable mating.    Better to coat 
the bottom side with multiple passes of a sprayed conformal coating or 
inject after the fact.

Doug Pauls



From:   Steve Gregory <[log in to unmask]>
To:     <[log in to unmask]>
Date:   12/11/2013 12:47 PM
Subject:        [TN] Press fitting Molex Micro-fit connectors through 
conformal coating...
Sent by:        TechNet <[log in to unmask]>



Hi all,

 

I seem to have some sort of memory of press-fitting connectors through
conformal coating, but like a lot of memories nowadays I can't be
absolutely sure...(sigh)

 

Have any of you ever done that?

 

Steve 

 


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