Rob:

Could you quantify "moderately rough"?

--
Warren Szkolnicki
Process Engineer
Broadband Networks Inc,
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Winnipeg, MB, CANADA  R3H 0H9

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Robert Schetty wrote:

>         The data that I've seen on this subject indicates that very
> smooth Ni/Au
> surfaces wire bond poorly.  On the other hand, an extremely rough
> Ni/Au
> surface also exhibits poor wire bond pull strengths.  In general, it
> seems a
> "moderately rough" Ni/Au surface provides the best results.
>
> Rob Schetty
> LeaRonal Inc.
>
> ----------
> ----------
> -------------------------------------------------------------------
> -------------------------
> A question came up on what the surface finish (smoothness/roughness)
> should
> be for wire bond on a land.  The plated finsh is typically nickel and
> a
> covered with a soft gold finsh.  Will hills and valleys in the surface
> make
> any difference in the bond strength.
>
> Phil Hinton
> hintpwb1@aol,com