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From: firstname.lastname@example.org (Nico Coesel)
Subject: Re: PCB routing
Date: Sat, 26 Oct 2002 10:07:55 GMT
References: <191C91BDFE8ED411B84400805FBE794C2DA011B9@pfs21.ex.nus.edu.sg> <email@example.com> <firstname.lastname@example.org>
NNTP-Posting-Date: Sat, 26 Oct 2002 10:09:10 +0000 (UTC)
X-Newsreader: Forte Free Agent 1.21/32.243
"Bevan Weiss" wrote:
>"chris" wrote in message
>> "Alex C" wrote in message
>> > Hi,
>> > How do we determine thickness of line width to route when dealing with
>> > or signal traces on a PCB? Does the location ( either surface layer or
>> > sandwitch in between dielectric) changes the properties of the thickness
>> > the trace?
>> > normally what is the size of a min via drill to use for power or signal?
>> > also what is the clearance to use for these via if it's surrounded by a
>> > plane?
>> > thanks for your expertise.
>> Hi, it all depends on your pcb manafacturer, they will normaly specify
>> the limits.Generaly , the min space should equal the min trace width,
>> the wider the better.Power traces should be laid out carefully, don't
>> let the autorouter do it,They don't have to be very wide unless you
>> have heavy current devices, 0.6mm is usually sufficient.
>0.6mm isn't very wide at all, that's less than 25mil. I would say that's
>only good for a couple of hundred milliamps max...
>I'd just go with a flood fill of ground on one side of the board and power
>on the other side. If you're designing a multilayer board this changes of
Copper poors only work a bit for shielding, not for distributing
power. On a double sided board you'll still need good power routing (I
always route power as a maze). There are to many intersections in a
copper poor on a double sided board to have adequate power
distribution (unless you're lucky...).
Reply to nico@nctdevpuntnl (punt=.)
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