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February 2016

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TechNet <[log in to unmask]>
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Date:
Tue, 16 Feb 2016 13:31:59 -0600
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TechNet E-Mail Forum <[log in to unmask]>, Jack Olson <[log in to unmask]>
Subject:
Re: IPC-7251, Generic Design for PTH design
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Jack Olson <[log in to unmask]>
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I don't think there is a standard for that.
I'm pretty sure they are allowed to overlap.
- but -
We don't want them to overlap too often, because it "swiss cheeses" the planes, 
and return currents have to go around slots created by "ganged clearances"

Jack

On Wed, 10 Feb 2016 17:43:16 +0000, Victor Hernandez <[log in to unmask]> wrote:

>Fellow TechNetters:
>
>   I am unable to find/locate a spacing dimension between the two antipad/clearance rings for class 3..
>
>Victor,

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