Senility must be setting in, eh... (:^b
--
George Patrick
Tektronix, Inc.
Central Engineering, M/S 39-512
P.O. Box 500
Beaverton, OR 97077-0001
Phone: 503-627-5272 Fax: 503-627-5587 Page: 503-575-9587
http://www.tektronix.com http://www.pcb-designer.com
It's my opinion, not Tektronix'
-----Original Message-----
From: Alcorn, Brent [mailto:[log in to unmask]]
Sent: Monday, July 08, 2002 11:51 AM
To: [log in to unmask]
Subject: Re: [DC] Via Size
Hi all,
In Canada the circumference is pi x diameter; perhaps it is like the
Imperial gallon vs the US gallon :)
Sorry...
In Fun,
Brent
-----Original Message-----
From: [log in to unmask]
[mailto:[log in to unmask]]
Sent: Monday, July 08, 2002 12:08 PM
To: [log in to unmask]
Subject: Re: [DC] Via Size
A little closer to use the circumference (pi X radius) of the drilled hole
(NOT the finished hole) for the trace width, the via plating thickness
(typically 1.0 to 1.5 mil) for the trace thickness, and use a trace width
calculator set for inner layers to calculate the current (I have one on my
web site www.pcb-designer.com, Doug Brooks has a stand alone one at
www.ultracad.com)
--
George Patrick
Tektronix, Inc.
Central Engineering, M/S 39-512
P.O. Box 500
Beaverton, OR 97077-0001
Phone: 503-627-5272 Fax: 503-627-5587 Page: 503-575-9587
http://www.tektronix.com http://www.pcb-designer.com
It's my opinion, not Tektronix'
-----Original Message-----
From: Tom Garman [mailto:[log in to unmask]]
Sent: Sunday, July 07, 2002 7:59 AM
To: [log in to unmask]
Subject: Re: [DC] Via Size
Hi Karthik;
I determine the "equivalent" trace width by 3.14XR^2. Then use the charts in
ipc-2221. The nominal plating in the hole should be halfway between 1 oz and
1/2 oz. use the chart for inner layers. Not very scientific, but I haven't
had any of them smoke yet.
Regards;
Tom Garman
----- Original Message -----
From: "Karthik, P.V.S. (IE03x)" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, July 04, 2002 7:54 AM
Subject: [DC] Via Size
> Hi All,
>
> I would like to know if there are any calculators/documents/standards for
> selecting/calculating the via size for a particular current rating ?
>
> Karthik P.V.S
>
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