How are the contact pads finished today? ENIG or hard (electrolytic) gold?
Are these high-wear contacts or one-time/limited cycle points?
Where are the contact pads located on the board?
We have some older products that have hard gold finger edge contacts; I
believe some of these boards (originally HASL) were converted to OSP and
thus were selectively plated.
I wouldn't expect the cost delta for OSP/hard gold to be significantly
different from ENIG/hard gold (another opportunity to engage with
purchasing!). My assumption is your application uses hard gold for contact
surfaces.
Ellsworth D. Berkowitz, P.E.
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