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Reply To: | TechNet Mail Forum. |
Date: | Mon, 6 Oct 1997 19:14:09 -0700 |
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The scientists an engineers that develop the press fit connectors must
have some kind of recommendation for press-fit connector applications.
What does AMP recommend for their product applications?
Wally Doeling (wallyd) wrote:
>
> 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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