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Subject:	Re: Annular Ring Question
From:	Mark Holmes <[log in to unmask]>
Reply To:	(Designers Council Forum)
Date:	Wed, 2 Jul 2003 08:57:55 +0100
Content-Type:	text/plain
Parts/Attachments:	text/plain (65 lines)

Hi All,

I have re-read my post and realised I made a typo and not made myself very
clear. The paragraph I am referring to is IPC-2221 9.1.2.

I would really like to know why the annular ring for an external land
includes the plating, but the annular ring for an internal land does not.

Best regards,

Mark


-----Original Message-----
From: Mark Holmes [mailto:[log in to unmask]]
Sent: Friday, June 27, 2003 10:42 AM
To: [log in to unmask]
Subject: [DC] Annular Ring Question


Hi All,

IPC-2221 9.2.2 Annular Ring Requirements states:

"The minimum annular ring on EXTERNAL layers is the minimum amount of copper
(at the narrowest point) between the edge of the hole and edge of the land
AFTER PLATING of the hole"

"The minimum annular ring on INTERNAL layers is the minimum amount of copper
(at the narrowest point) between the edge of the drilled hole AFTER DRILLING
the hole"

I am confused as to why there are two definitions. Can anyone help?
I have a few Ideas of my own, but would appreciate an explanation.

Best Regards,

Mark

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