Never really seen the AA but all other letters have definitions.
/24 type of resin system
C1 type of copper
3 classification
Without looking up the actual y new spec I think letters now determine class
and in the IPC spec takes about Reducibility levels which are letters too!

www.quickturnflex.com
Thank you, 
Jim Mahoney 
Quick Turn Flex Circuits, LLC 
Applications Project Manager 
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Connitt
Sent: Wednesday, May 20, 2009 6:47 AM
To: [log in to unmask]
Subject: [TN] IPC-4101 specification question

Hi all,
I have an older fabrication drawing here that has a suffix on a material
spec. that I cannot locate in the IPC spec and I was wondering if
anybody can help me out.
The material callout is "IPC-4101/24-C1/C1AA3.
What is AA3 referring to??
Thanks,
Dave Connitt CID+
Printed Circuit Designer
L3 Fuzing & Ordnance Systems
A Wholly Owned Subsidiary of:
L3 Communications
3975 McMann Road
Cincinnati, Ohio 45245
Ph. 513- 943-2010   Fax 513-943-2288

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