Nickel Gold finish, is not recommended for press fit.
On Tue, Dec 3, 2013 at 7:49 PM, Joyce Koo <[log in to unmask]> wrote:
> Yes, for high rel, high vibration environment, you need to solder all the
> press fit connection. You need to pre-tinned press fit socket prior to
> solder to remove the gold. If I am not mistaken, it is not the standard
> solder alloy you suppose to use for such application.
>
> Sent from my BlackBerry 10 smartphone on the Rogers network.
> Original Message
> From: Glidden, Kevin
> Sent: Tuesday, December 3, 2013 11:01 AM
> To: [log in to unmask]
> Reply To: TechNet E-Mail Forum
> 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 transmission (including any attachments) may contain confidential
> information, privileged material (including material protected by the
> solicitor-client or other applicable privileges), or constitute non-public
> information. Any use of this information by anyone other than the intended
> recipient is prohibited. If you have received this transmission in error,
> please immediately reply to the sender and delete this information from
> your system. Use, dissemination, distribution, or reproduction of this
> transmission by unintended recipients is not authorized and may be unlawful.
>
> ______________________________________________________________________
> 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]
> ______________________________________________________________________
>
--
Best Regards,
*Reuven Rokah*
Mobile: 972-52-6012018
Tel: 972-3-9360688
Fax: 076-5100674
<http://www.rokah-technologies.com/>[log in to unmask]
[log in to unmask]
www.rokah-technologies.com
This e-mail message is intended for the recipient only and contains
information which is CONFIDENTIAL and which may be proprietary of Rokah
Technologies. If you have received this transmission in error, please
inform me by e-mail, phone or fax, and then please delete all of the
original files and all other copies exist.
______________________________________________________________________
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]
______________________________________________________________________
|
