To what extent?
     Both internal and external?


______________________________ Reply Separator _________________________________
Subject: FAB: Annular Ring
Author:  [log in to unmask] at INTERNET
Date:    02/07/97 3:54 


Subject: Re: Annular Ring
In-Reply-To: your message  of Tue Feb 04 18:00:23 -0500 1997 
Content-Type: Text
To: [log in to unmask]
     
My vote is to allow breakout.
     
I have been working with an ITRI committee that is in the process of 
completing a reliability study of breakout.  A report will be issued sometime 
in the next few months.  To date, this study has found no evidence for a 
reliability risk from breakout.  Further evidence for accepting breakout comes 
from the specifications of many large OEM's who have allowed breakout for 
years with no reported reliability problems.
     
Bob Holmes PHD
804-226-5114
[log in to unmask]
     
After April 1
804-737-4987
[log in to unmask]
     

------------- Begin Original Message ------------- 
From: ipc.ipc.org!TechNet-request
Date: Tue Feb 04 18:00:23 -0500 1997 
Subject: Annular Ring
Original-CC: [log in to unmask] 
To: [log in to unmask] (!technet)
Cc: [log in to unmask]
Content-Type: text     
Content-Length: 1258
     
Dear fellow designers,
                    we are in process of revising our corporate specs,
so we can achieve bigger board density.
Our present requirements are (external and internal) 0.002 inch annular 
ring, except in the area adjoining the conductive trace where there 
shall be 0.005 minimum annular ring.
     
Are there some data documenting defects or failure on boards using
     
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