Kaye - if you check out the appendix of 4552 - ENIG spec you will see the
data for membrane switches - 1.5 million cycles before we stopped the test -
the board surface was perfect after the test. For the 4553 I Ag
specification we tested to 1 million cycles and are recommending its use for
non class 3 applications, concerns being the active and dynamic nature of
the surface.

Regards,
Gerard O'Brien
Photocircuits Corporation
Co-chair 4-14 plating committee.


-----Original Message-----
From: Kaye Clayo [mailto:[log in to unmask]]
Sent: Monday, November 01, 2004 4:10 PM
To: [log in to unmask]
Subject: [TN] Surface Finish for keypad membrane switches

Technet:

Is ENIG a good reliable surface finish for keypad membrane switches that
cannot be bussed to the edge of the board?
If not, what be a good surface finish for Lead-Free keypad switches.

Thank you in advance.

Kaye Clayo


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