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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