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May 2001

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Subject:
From:
Dennis Fritz <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 15 May 2001 13:05:55 EDT
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In a message dated 5/14/01 3:38:10 PM US Eastern Standard Time,
[log in to unmask] writes:

<<         Can anyone tell me if there are any probblems using Electroless
Nickel
 (5micron) / Immersion Gold (0.1 micron) as a surface finish on High
 Frequency boards (10GHz). Particularly,is nickel a poor conductor at High
 Frequencies? >>

Gordon,

I would call out the paper at IPC Expo last month in Anaheim, CA - "Effects
of Surface Finish on High Frequency Signal Loss Using Substrate Materials".
The paper reports that at 10 gigahertz, "thick" electroless nickel (200
microinch) shows a skin effect of about 0.9 dB/inch.  This is more than for
"thin" electroless nickel, OSP, immersion silver, and HASL.  Table 1 in the
article reports electroless nickel has 3-4X the resistance of eutectic solder
and 30-40X the resistance of copper or silver.  So,  thicker electroless
nickel, longer signal traces, and higher frequencies make the skin effect
worse.

Paper was joint between MacDermid, Taconic Laminates, Omni Circuits, and
Rockwell Collins and received the "best technical paper" award at IPC Expo -
2001.

The paper should be available through the IPC, or if publication is not
pending, from one of the authors - I can refer you to one of them if you want
an electronic copy.

Dennis Fritz
MacDermid, Inc
Waterbury CT.

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