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April 2008

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Subject:
From:
Lee parker <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Lee parker <[log in to unmask]>
Date:
Tue, 8 Apr 2008 09:57:19 -0400
Content-Type:
text/plain
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text/plain (54 lines)
John

Assuming your product is commercial in nature, I would suggest you have a
innerlayer registration requirement. I am aware of several very expensive
fires (taking out entire facilities) that were caused by poor innerlayer
registration and voltage surges. After incorporating the so called R coupon
and enforcing the test the issue was resolved


----- Original Message -----
From: "Murphy, John" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, April 07, 2008 1:13 PM
Subject: [TN] layer to layer registration?


Greetings,

                  Is it a good idea to specify layer to layer
registration for Class II

multi-layer PCB's? My searching thus far indicates it is not directly
contained

in any IPC specification (other than annular ring requirements) but
relegated to

the Master Drawing.


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