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Subject:	Double-Blind Via Construction and IPC-6012C
From:	John Perry <[log in to unmask]>
Reply To:	(Combined Forum of D-33a and 7-31a Subcommittees)
Date:	Mon, 9 Nov 2009 09:52:22 -0600
Content-Type:	multipart/mixed
Parts/Attachments:	text/plain (1117 bytes) , 6012c-3-9.jpg (1 MB) , Blind Via Defects 11-08-09.ppt (1 MB)

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)
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