I did ; gold being single process finished on top ;
the cycling results are in the my lab books (which I couldn't mail-legals) .
The cycling of gold (the switch pad shape is important > incircled spirals
are poor design ; half moon, or quarter pie pads > with rounded corners >
sharp corners encourage hairline shorts : did go over 1M cycles without
resistivity changes ;
whereas a lot of the carbon's dusted up = proved not as stable, cheap, and
supplier uniform as gold .
NiAu is in my opinion far ahead even on basic criterias ON BOARDS YOU HAVE
TO SOLDER ON AS WELL AS YOU SWITCH ,
that may be different matter on other applications :

My question back : what's your application ?

See you

Paul Klasek
http://www.resmed.com

-----Original Message-----
From: BPL-PCB, Doddaballapur [mailto:[log in to unmask]]
Sent: Saturday, 24 July 1999 15:55
To: [log in to unmask]
Subject: [TN] Key pad properties
Importance: High


Hello Friends,

Have any one studied the comparative properties of carbon key pads versus
Gold plated key pads ? If so, please mail it to me.

With regards,
K.Chandrabose

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