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Mon, 6 Oct 1997 18:44:23 -0400 |
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Wally
Have you ever used the press-fit connectors of not gold plated? And how
is that working in this case?
I would really appreciate it if you can provide me that kind of
information.
Fulton Feng
Sr. Process Engineer
Nortel
[log in to unmask]
>----------
>From: Wally Doeling (wallyd)[SMTP:[log in to unmask]]
>Sent: Monday, October 06, 1997 12:44 PM
>To: [log in to unmask]
>Subject: Re: [TECHNET] Press Fit and Ni/Au Surface Finish
>
> On the other hand, we have been using press-fit into Immersion
>gold/Electroless Nickel, with press-fit connectors for 3 years with no
>problems.
> The press-fit connectors are Nickel/Gold plated and the gold on
>gold provides the lubricant.
> Most gold plated press-fit connector pins are underplated with
>nickel also.
> The trick is to control the hole size to give a good press fit,
>without distorting the fiberglass
>in back of the hole.
> It does work! And works well.
> [log in to unmask]
>
> -----Original Message-----
> From: Paul Gould [SMTP:[log in to unmask]]
> Sent: Monday, October 06, 1997 10:16 AM
> To: [log in to unmask]
> Subject: Re: [TECHNET] Press Fit and Ni/Au Surface Finish
>
> Gus Morvillo wrote:-
> >I am looking into E Ni/ I Au surface finishes, and have heard
>of a concern
> >about press fit connectors and barrel cracking. Has anyone
>experienced this
> >problem?
> >Would there be a retention force issue, with one removal and
>re-insert?
> Hi Gus,
>
> E Ni/I Au is not recommended for press fit for two reasons.
> Firstly, solder acts as a lubricant to pin insertion and forms a
>gas
> tight seal which is why it is recommended for press fit.
> Secondly, Electroless Nickel is brittle and fractures which
>could result
> in stray metal causing subsequent connector shorts. Also, there
>is no
> gas tight seal formed which could lead to future corrosion.
>
> We produce many multi-layer backplane pcb's for global companies
>and
> they still specify tin-lead, either Reflowed or HASL. I have not
>seen
> any other alternatives mentioned or been asked to come up with
>one.
>
> Best Regards
> Paul Gould
> [log in to unmask]
> Teknacron Circuits Ltd
> Isle of Wight,UK
>
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