[PCB_FORUM] Re: Anti-pads
- From: "Schwartz, Jerome" <jschwa01@xxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Fri, 14 Dec 2007 14:27:03 -0500
Actually Anti_Pads are on positive planes. By using them instead
of the DRC values you can vary the clearance per padstack.
This is a good option for different size non-plated holes with various
GD&T and for
high layer count designs with small drills.
Jerry
________________________________
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Gerry Meier
Sent: Friday, December 14, 2007 2:16 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Anti-pads
It's a 26 mil anti-pad, anti-pads are only defined on Negative planes.
You would not have a 20 mil pad on a negative plane layer. If you are
using "positive" planes then you would relay on the DRC values "pad to
shape" for that and then yes suppress non-functional pads.
Gerry
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 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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