Werner,
How can I get information regarding your suggested "Tutorial". I do not
have
copies of the IPC documents you stated. Before purchasing I would like to
get
acquainted with them to ensure they will meet my needs and for reference
material.
Does this tutorial follow the IPC documents or is it a separate training
doc? It's
the RED flag awareness that I am very much interesting in to share with the
decision making engineers.
Victor,
-----Original Message-----
From: Werner Engelmaier [mailto:[log in to unmask]]
Sent: Thursday, April 24, 2003 11:12 AM
To: [log in to unmask]
Subject: Re: [TN] Aspect Ratio&Area Ratio Defines
Hi Victor, Jeffrey & Roger,
IPC-2222, Page 19, section 9.2.2.1, and page 20, Table 9-4 is very helpful.
The aspect ratio as the PCB thickness divided by the drilled hole
diameter--of course, the critical aspect ratio of any PCB is the one with
the smallest drilled hole diameter. Thus, a 62mil thick PCB with a drilled
hole diameter of 20mil would have an aspect ratio of 3.1:1. IPC-TR-579
"Round Robin Reliability Evaluation of Small Diameter Plated Through Holes
in Printed Wiring Boards" and IPC-D-279 "Design Guidelines for Reliable
Surface Mount Technology Printed Board Assemblies" show that the aspect
ratio serves as a 'Red Flag;' it is not a physical parameter with a single
meaning. Hole diameter and PCB thickness act independent of each other in
influencing via reliabilty. If IPC-TR-579 and IPC-D-279 do not provide
enough information, you may want to attend my tutorial "Interconnect
Failures and Design for Reliability for Plated-Through Holes/Vias
(PTHs/PTVs)"
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting 7 Jasmine
Run Ormond Beach, FL 32174 USA
Phone: 386-437-8747, Fax: 386-437-8737, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com
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