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April 2005

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Subject:
Handle Class 3 Annular Ring Specification
From:
"Brionez, Gregory" <[log in to unmask]>
Reply To:
(Designers Council Forum)
Date:
Mon, 18 Apr 2005 15:14:39 -0500
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DC
I need some clarification on the subject of 
IPC 2221 Section 9.1.2 it states 
For a Class 3 designs " An annular ring shall be required for all plated through holes in Class 3 designs."
My assumption is to leave an annular ring on all layers. The IPC document does not specifically state as such.
This is for Mil/Aerospace. Do those of you who do Class 3 remove non-functional inner layer pads.
 
Thanks for any assitance. 
Paul
 
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Paul Brionez -  <mailto:[log in to unmask]> CID
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PCB Designer
PH: 847-673-2718 x1394
FAX: 847-673-9789
DIVISION: Electronic/Systems

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