[SI-LIST] Re: copper thickness of a ref plane

Michael,
the driver for moving to 1/2 oz. copper is clearance through the pin fields
of the connectors. i have to stay 12 mils away from the pads of a pci
connector on a ground plane if the plane is 1 oz. - if it's 1/2 oz., then i
only have to stay 8 mils away. this allows more copper through the pin
fields on my ref planes.
regards,
Jim

-----Original Message-----
From: Greim, Michael [mailto:mgreim@xxxxxxxxxxxx]
Sent: Wednesday, June 20, 2001 4:59 PM
To: 'si-list@xxxxxxxxxxxxx'
Subject: [SI-LIST] Re: copper thickness of a ref plane



Make sure that the ampacity of a half ounce plane
is adequate for your needs.  What is driving your 
decision to head in this direction?  There may be 
a better alternative.

Best Regards,

Michael C. Greim                 Sonus Networks
mgreim@xxxxxxxxxxxx        978-589-8336

Making the world safe for digital signals everywhere

And all this science I don't understand
It's just my job six days a week

The time is gone. The email's over
Thought I'd something more to say......


-----Original Message-----
From: Peterson, James F (FL51) [mailto:james.f.peterson@xxxxxxxxxxxxx]
Sent: Wednesday, June 20, 2001 4:31 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] copper thickness of a ref plane



Because of physical limitations, I am considering reducing all of the ref
planes on a design to 1/2 oz. copper (was 1 oz. copper). The board level
logic is 3.3V CMOS. Does anybody see any problems with doing this?

thanks,
Jim 
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