[PCB_FORUM] Re: Anti-pads
- From: "Paul Gingras" <paul@xxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Fri, 14 Dec 2007 15:12:36 -0500
Gary that's a big affirmative . then multiply that along the length of the
trace and add up the instances that the trace runs over the antipad .. Your
Compliance people are going to be non to thrilled!
Season's Greeting's
KAW USA
_____
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary
Sent: Friday, December 14, 2007 3:01 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Anti-pads
Alan,
This sounds like a lot, 10 per side over the drill (30 mil anti-pad for a 10
mil drill).
When you have several high speed traces at minimum spacing between vias,
that's more than you can afford.
Those high speed traces don't like to run over the hole (anti-pad) in the
reference plane.
Thanks for the reply.
Gary E. MacIndoe
PCB Design Engineer
Fort Collins, Colorado
amd.com
gary.macindoe@xxxxxxx
_____
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Ritter, Alan
Sent: Friday, December 14, 2007 12:25 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Anti-pads
Smallest anti-pad we have used is 25 mils for 8-mil (BGA) and 10-mil vias.
35 mils for 15-mil "power" vias, etc. We figure a minimum of 10 per side
over the drill.
/s/jar (alan.ritter@xxxxxxxxxx)
http://www.mtritter.org
_____
From: Macindoe, Gary [mailto:Gary.Macindoe@xxxxxxx]
Sent: Friday, December 14, 2007 1:11 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Anti-pads
Thanks Gerry.
I haven't thought about it for quite a while, I was forgetting that anti-pad
to drill is what matters.
I suppose with an anti-pad that small, you have to make sure you suppress
unused inner pads.
A drill of 10 mil probably has a 20 mil pad, so a 16 mil anti-pad to a 20
mil pad would be too close otherwise.
Thanks again,
Gary
Gary E. MacIndoe
PCB Design Engineer
Fort Collins, Colorado
amd.com
gary.macindoe@xxxxxxx
_____
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Gerry Meier
Sent: Friday, December 14, 2007 11:48 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Anti-pads
16 mil over the drill size - 10 mil drill 26 mil anti-pad
Gerry Meier, Sr. PCB Designer
Freedom CAD Services. Inc
Voice: (256)776-7470 or (603) 864-1350
Email:gerry.meier@xxxxxxxxxxxxxx
visit us at http://www.freedomcad.com
_____
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary
Sent: Friday, December 14, 2007 12:28 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Anti-pads
Hey guys,
We haven't thrown around anti-pads for a while!
What is the smallest anti-pad for an inner plane that you have successfully
used?
Has anyone used down to 5 mils a side anti-pad to pad?
Thanks,
Gary
Gary E. MacIndoe
PCB Design Engineer
Fort Collins, Colorado
amd.com
gary.macindoe@xxxxxxx
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