JoAnn,

When a standard is released and supersedes another standard, it is effective
immediately. Some procurement contracts will allow automatic migration to the latest
standard, while others require an approval. Very often an old standard becomes
inactive for new designs.

The 2000 series of standards have only recently been released by IPC. Therefore a
number of companies are reviewing the impact of its content before retiring the
IPC-D-275.

On another note, the Pwb Design Certification process currently uses the IPC-D-275.
The program is not affected since it utilizes the principles of design, rather than
specific numbers in the tables of IPC-D-275. At some point, we will update our tables
to those in the newer design standards.

If would be happy to discuss the table on page 5 offline.

Regards,

Gary Ferrari
Executive Director
IPC Designers Council
(860) 350-9300 Fax (860) 350-9309
[log in to unmask]

>>> JoAnn Amerson <[log in to unmask]> 04/13/98 07:52AM >>>
> The IPC Designers Council Certification Preparation Study Guide covers the DFM
issues
> surrounding sound printed board design practices. The basis of the guide is
> IPC-D-275, Design Standard for Rigid Printed Boards and Rigid Printed Board
> Assemblies. In addition, it references a number of other industry and IPC
Standards.

Gary,

This reminds me of a question I've been curious about.  I recently
received my copies of IPC-2221 and 2222.  They state that they
supercede IPC-D-275.  Is that effective immediately or down the road
a bit?  I'm confused because I still read a lot of posts referring to
the latter and none to the former.

Also, if any of you who understand Table 3-1 on page 5 of IPC-2221,
would you please contact me?  I have several questions about how to
read that table and would appreciate some "simple" answers.  I'm far
from being a "guru" or an engineer (I can't even spell 'train').

Thanks everyone!

JoAnn L. Amerson
Design Librarian
Red Lion Controls, Inc.
E-mail: [log in to unmask]
Voice: (717) 767-6961 ext 6308

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