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Yes, I would agree we should adopt such a "Zone A boundary" for Blind vias and I think the diagram is a good start for inclusion.
Mike
-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of John Perry
Sent: Monday, November 09, 2009 10:52 AM
To: [log in to unmask]
Subject: [IPC-600-6012] Double-Blind Via Construction and IPC-6012C
Hello Everyone,
Recently, we updated the attached IPC-6012C Figure 3-9 to better illustrate requirements for laminate anomalies in Zone A and Zone B.
A question has come up regarding laminate anomalies in double-blind via constructions. Please refer to the attached PowerPoint file. The questions are:
* Are laminate defects in Zone A allowed after thermal stress?
* Are any defects allowed in the non-thermal stressed condition in Zone A?
* What would be the size of defects allowed? Would they be the same as for standard PTHs?
* If defects allowed in non-stressed condition is there a minimum spacing requirement of resin/glass between layers?
Let's discuss this through this IPC-600-6012 e-mail forum and see if there is a need to further update IPC-6012C Figure 3-9 (or duplicate it and modify as needed for double-blind constructions).
Regards,
John Perry
Technical Project Manager
IPC - Association Connecting Electronics Industries(r)
3000 Lakeside Drive # 309S
Bannockburn, IL 60015-1249 USA
+1 847-597-2818 (tel)
+1 847-615-7105 (fax)
+1 847-615-7100 (Main)
[log in to unmask]
www.ipc.org
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