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February 2016

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Subject:
Re: IPC-7251, Generic Design for PTH design
From:
Jack Olson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Jack Olson <[log in to unmask]>
Date:
Tue, 16 Feb 2016 13:31:59 -0600
Content-Type:
text/plain
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text/plain (16 lines) 
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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