We have had a go round on this exact topic before when learned types went
into the matter in some detail with references. The conclusion was pretty
well as Kevin summarises: solder or pressfit but not both. Searching the
archive will no doubt turn it up.

Regards 
 
Mike 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Glidden, Kevin
Sent: Tuesday, December 03, 2013 4:01 PM
To: [log in to unmask]
Subject: Re: [TN] Press Fit

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


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________

This E-mail is confidential. It may also be legally privileged. If you are
not the addressee you may not copy, forward, disclose or use any part of it.
If you have received this message in error, please delete it and all copies
from your system and notify the sender immediately by return E-mail.

Internet communications cannot be guaranteed to be timely, secure, error or
virus-free. The sender does not accept liability for any errors or
omissions.

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________



______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________