Hi John, Bill, Mark and Alan,
Thank you for your input, I look forward to the outcome of your Phoenix
discussions.
Another anomaly has arisen which I would like input on. It concerns
IPC-2223B Clause 10.1.2 which states the finished sealed edge condition
of finished product as not less than 0.4mm [0.0157"]. IPC-6013 Clause
3.3.1.2 does not confirm this value but leaves it open as an AABUS and
Section 4.1 of IPC-A-600G does not elaborate further or confirm the
IPC-2223A value. Should the 0.4mm value be used as a "standard"
acceptability criteria for everyday purposes?
Best Regards,
Phil.
-----Original Message-----
From: John Perry [mailto:[log in to unmask]]
Sent: 03 February 2009 20:05
To: Anslow, Phillip (UK); Bill Ortloff; Mark Finstad; Alan D Exley
Subject: RE: CONFLICT: IPC-2223B and IPC-6013A
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Hello Phillip and All,
You have tapped into a discussion that is going on within the IPC D-11
Flex Design Subcommittee. We recognize that there is confusion between
what is called out in Table 4-2 of the design standard and in Table 1-1
of the performance specification.
Alan and Bill, would either of you be able to comment on this issue? I
believe it is something we will be addressing next week at the IPC D-11
meeting in Phoenix, AZ.
Thanks,
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
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Anslow, Phillip (UK)
Sent: Thursday, January 29, 2009 9:48 AM
To: [log in to unmask]
Subject: [TN] IPC-2223B and IPC-6013A
Dear Technetters and Designers,
A question to resolve apparent conflict between the above IPCs.
As an example, take a 14 layer (4R+6F+4R) flex-rigid design 1.8mm thick
with polyimide/glass laminates and pre-preg used in rigid portions.
From IPC-2223A Table 4-2 Subnote (1) I would assume as <10% Low Tg
Laminate, the example would qualify as a Type 4(1), therefore requiring
Minimum Average Copper Thickness of 25um [984uim]. There is no Class
1,2,3 distinction.
But, IPC-6013B Table 1-1 Hole Plating for Type 4 > 6 layers Min.Ave
Copper for Class 3 calls for 35um [0.00138in]. This conflicts with
IPC-2223A Table 4-2 for a Type 4(1) Flex-rigid PCB and IPC-6013B Table
1-1 does not make distinction for amount of Low Tg material in build.
Could you help in understanding if I am missing something? Which should
be taken as "bottom line" - the design standard IPC-2223A or the
Qualification and Performance spec IPC-6013B for a high-rel application?
Thanks for your advice in advance.
Phil.
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