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| From [log in to unmask] Thu Apr 11 14: |
10:29 1996 |
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Mail*Link(r) SMTP FWD>>DES/FAB- hole wall thic
Susan and all, I apologize, I goofed when I didn't pre-read/edit my previous
response to Susan's inquiry.
In the table of sheet resistances, the last one was in error. The error for
the 190 micrometer Cu thickness was the 5 mils Cu should have been 2 mils Cu
which was the mentioned PTH Cu plating thickness Susan mentioned, and is
corrected in the complete table below.
25 micrometer [1 millinch] ~680 microhms/sq
35 micrometer [1 oz/sqft Cu] ~485 microhms/sq
50 micrometer [2 millinch] ~340 microhms/sq
70 micrometer [2 oz/sqft Cu] ~240 microhms/sq
140 micrometer [4 oz/sqft Cu] ~120 microhms/sq
190 micrometer [4 oz/sqft + 2 mils Cu] ~90 microhms/sq
Ralph Hersey
e-mail: [log in to unmask]
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