[SI-LIST] Re: Resistance
- From: "Chung, Chee Yee" <chee.yee.chung@xxxxxxxxx>
- To: "'xlzhou@xxxxxxxxx'" <xlzhou@xxxxxxxxx>,"Si-List (E-mail)" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 13 Aug 2001 08:38:03 -0700
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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