Hi team - I agree with Kevin on this one. If the customer really wants a 
soldered connector then they should be using  a connector that is designed 
for soldering. Press fit connectors are designed for interference fits and 
just because they "can" be soldered, doesn't mean they should be soldered. 
Many folks consider the soldering of a press fit connector a violation of 
good design practices.

Dave Hillman
Rockwell Collins
[log in to unmask]



From:   "Glidden, Kevin" <[log in to unmask]>
To:     <[log in to unmask]>
Date:   12/03/2013 10:02 AM
Subject:        Re: [TN] Press Fit
Sent by:        TechNet <[log in to unmask]>



Bad idea.

For one thing, most all press-fit contacts have a hard gold finish.  If 
you solder this, your solder joint will be a ripe candidate for gold 
embrittlement.  It is a J-STD-001 requirement to remove gold prior to 
soldering.  And tinning prior to insertion would increase lead diameter 
and insertion forces, likely leading to PTH damage.

Second, press-fit insertion is an interference fit.  There was a 
discussion just yesterday in TN about the criticality of getting the PCB 
hole spec just right for both the drill and finish sizes.  The 
installation results in a hoop stress to the PTH.  One can only imagine 
what can happen if you then take that to solder temperatures.  Lead 
interference with the PTH for TH soldered applications is a no-no.

My 2 cents.

Kevin Glidden

-----Original Message-----
From: Vargas, Stephen M [mailto:[log in to unmask]]
Sent: Tuesday, December 03, 2013 10:36 AM
To: [log in to unmask]
Subject: [TN] Press Fit

All:

    I have a customer who is specifying a press fit connector to be 
soldered after the press fit operation. I've never heard of this and I was 
wondering if there is any quality/reliability data in the industry as to 
why one should/shouldn't do this. Our customer's explanation was that it 
would add mechanical integrity to the joints. Thanks in advance.

Regards,
Steve Vargas


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