Ken Patel wrote:
>
> Hello Technetters,
> I have couple of questions for Entek coated boards I am running on sample
> basis.
> (1) Do I need to apply solder paste on mounting holes of Entek coated
>     boards? These mounting holes will be used to fasten the board in a
>     chassis. Give me your pros and cons.

        We routinely see OSP users seeking testpads and Cu chassis
        mounting surfaces to be pasted and reflowed.  OSP residuals
        apparently do not make for a good surface for electrical
        contact, in spite of questionable flatness.

> (2) The boards do have press fit connectors. Do you think I will be OK
>     with the Entek coating as connectors now will be making a contact
>     with copper which will get oxidized. Any long term problem from
>     reliability point of view. Can anyone suggest any test to find any
>     long-term reliability problem because of press-fit connector going
>     onto the bare copper?

        Have seen the suggestion to use solder finished leads
        since solder acts as a lubricant to the pressfit process.
        Have not yet had to shepherd combination of pressfit and
        OSP through to actual product myself (whew).

        Good luck, and regards to all,
--

      Jeff Seeger                         Applied CAD Knowledge Inc
      Chief Technical Officer                  Tyngsboro, MA  01879
      jseeger "at" appliedcad "dot" com                978 649 9800

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