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Reply To: | TechNet E-Mail Forum. |
Date: | Mon, 30 Oct 2000 08:48:15 -0500 |
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Mike,
The figure in question is for temperature rise, given an amount of current
for a given cross-sectional area of copper, how hot will it get (see note 1
of Figure 3-4). For 1 oz or 1/2 copper, 0.012 inches for 300mA should be
okay, For a handy temperature rise calculator, go to
http://www.ultracad.com/calc.htm
and download PCBTemp.exe. Microsoft VBRUN300.DLL is required to use it.
Roger M. Stoops, C.I.D., PCB Designer
Spectra Precision Inc./Trimble Navigation Ltd.
5475 Kellenburger Rd.
Dayton, OH 45424-1099 USA
Ph: 937.233.8921 or 937.233.4574 ext 288
Fax: 937.233.7511
Mike Cubon
<mcubon@ITWCHRONO To: [log in to unmask]
MATIC.COM> cc:
Sent by: TechNet Subject: [TN] Tech question.
<[log in to unmask]>
10/28/00 02:24 PM
Please respond to
"TechNet E-Mail
Forum."; Please
respond to Mike
Cubon
My name is Mike Cubon and I work for ITW Chronomatic. We manufacture
Polymer
Thick Film circuits and I have a technical question about figure 3-4 in
IPC-D-275. There are three graphs that show current rating for different
conductor traces at different temperatures. Are there any charts or perhaps
a formula for calculating current capacity below the temperatures shown.
The
application is automotive and will be tested to -40C. The max. current will
be 300mA and trace width will be .012 inches.
Any help is greatly appr.
Mike
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