[SI-LIST] Antwort: Re: Resistance
- From: Andreas_Lenkisch@xxxxxxxxxx
- To: "Si-List (E-mail)" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 13 Aug 2001 17:56:31 +0200
Mick and Chee-Yee,
don't forget some material lost by cleaning processes and the influence of
roughness,
Andreas
Andreas Lenkisch
Product Manager Backplanes
Schroff GmbH
Langenalber Strasse 96-100
D-75334 Straubenhardt
Germany
Ph.: ++49 7082 794 674
FAX.: ++49 7082 794 133
mobile: ++49 175 59 43 544
e-mail: andreas_lenkisch@xxxxxxxxxx
Internet: www.schroff.de
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| | "Chung, Chee Yee" |
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| | 13.08.2001 17:38 |
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| An: "'xlzhou@xxxxxxxxx'" <xlzhou@xxxxxxxxx>, |
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Mick,
you will never get pure copper resistivity, because of the nickel and gold
plating. as for the packages that we use, our trace resistivity turns out
to be between 1.3X-1.5X that of pure copper. including manucturing
variances, we have used as much as 2X pure copper resistivity.
chee-yee
-----Original Message-----
From: Zhou, Xingling (Xingling) [mailto:xlzhou@xxxxxxxxx]
Sent: Monday, August 13, 2001 7:07 AM
To: Si-List (E-mail)
Subject: [SI-LIST] Resistance
Hi,
When you calculate the DC resistance of wires and traces, which resistivity
values should be used or more practical ? Most books give
1/5.8e-7 = 1.724e-8 for pure cooper. However, Dr. Johnson's book gives
6.787e-7 (p.411) and he explained his reasons. On p.409, he mentioned that "
the authors have used MathCad to evaluate each of the following formulas in
well-known test cases...". Obviously, the
two values are quit different, three times ! So, please provide your
suggestion ?
Thanks.
Mick
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