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April 2003

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Subject:
From:
"Barmuta, Mike" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 29 Apr 2003 15:16:20 -0700
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Ken: It can, but one issue could be the ENIG vs carbon ink polymer thick
film(PTF). If the carbon is being used as a static contact such as a mating
surface to an LCD it's probably OK. However if the carbon contact is being
used as a dynamic or cycling contact such as keypads, rotary switches, etc,
there may be a wear or life cycle problem. This depends on the mating
contact design and life expectancy of the electronic package.

Obviously if it is going to have to survive thousands and thousands of
cycles it should be tested. I've seen ENIG wear thru on rotary switches in
less than ten thousand cycles, where the correct type of carbon PTF has held
up for a hundred thousand. So it really depends on the design, material of
construction and application.



Regards

Michael Barmuta

Staff Engineer

Fluke Corp.

Everett WA

425-446-6076

-----Original Message-----
From: Ken Patel [mailto:[log in to unmask]]
Sent: Tuesday, April 29, 2003 2:26 PM
To: [log in to unmask]
Subject: [TN] Surface Finish


Expert,
Can Carbon ink and HASL finish be replaced entirely by ENIG finish or any
other finish?

re,
ken patel

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