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ANSI/VITA 48.5
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ANSI/VITA 48.5 Mechanical Standard for Electronic Plug-in units Using Air Flow Through Cooling
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ANSI/VITA 48.5-2010 VITA
Copyright © VITA 2010. All Rights Reserved. PO Box 19658, Fountain Hills, AZ 85269
480-837-7486
info@vita.com
www.vita.com
Approved ANSI Standard
ANSI/VITA 48.5
Mechanical Standard for Electronic Plug-in units
Using Air Flow Through Cooling
Abstract
This standard establishes the design requirements for an air-flow-through cooled plug-in unit with
a form factor as close to 6U as possible while retaining the VITA 46 connector layout. Unlike
ANSI/VITA 48.1, which uses cooling air impinged directly upon the components and circuit
boards, this plug-in unit uses a compact core heat exchanger located within the central heat sink
of the unit.
Approved: September 2010
American National Standards Institute, Inc.
Secretariat: VITA
ANSI/VITA 48.5-2010
Copyright © VITA 2010. All Rights Reserved.
Notices
American National Standard
Approval of an American National Standard requires verification by ANSI that the requirements for due
process, consensus, and other criteria for approval have been met by the standards developer.
Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial
agreement has been reached by directly and materially affected interests. Substantial agreement means
much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and
objections be considered, and that a concerted effort be made toward their resolution.
The use of American National Standards is completely voluntary; their existence does not in any respect
preclude anyone, whether he has approved the standards or not, from manufacturing, marketing,
purchasing, or using products, processes, or procedures not conforming to the standards.
The American National Standards Institute does not develop standards and will in no circumstances give
an interpretation of any American National Standard. Moreover, no person shall have the right or
authority to issue an interpretation of an American National Standard in the name of the American
National Standard Institute. Requests for interpretations should be addressed to the secretariat or
sponsor whose name appears on the title page of this standard.
CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The
procedures of the American National Standards Institute require that action be taken periodically to
reaffirm, revise, or withdraw this standard. Purchases of American National Standards may receive
current information on all standard by calling or writing the American National Standards Institute.
NOTE: The user’s attention is called to the possibility that compliance with this standard may require use
of an invention covered by patent rights.
By publication of this standard, no position is taken with respect to the validity of this claim or of any
patent rights in connection therewith. The patent holder has, however, filed a statement of willingness to
grant a license under these rights on reasonable and nondiscriminatory terms and conditions to
applicants desiring to obtain such a license. Details may be obtained from the standards developer.
COPYRIGHT NOTICE
Published by:
VITA
PO Box 19658, Fountain Hills, AZ 85269
Copyright © 2010 by VITA
All rights reserved.
Except for employees of VITA member companies, no part of this publication may be reproduced in any
form, in an electronic retrieval system or otherwise, without prior written permission of the publisher.
Printed in the United States of America - R1.0, ISBN 1-885731-62-0.
ANSI/VITA 48.5-2010
Copyright © VITA 2010. All Rights Reserved.
Comments, Corrections, and/or Additions
Anyone wishing to provide comments, corrections and/or additions to this draft specification please direct
them to the Technical Director techdir@vita.com at the VITA office.
VSO and Other Standards
Should anyone want information on other standards being developed by VSO, VME Product Directories,
VME Handbooks, or general information on the VME market, please contact the VITA office at the
address or telephone number given on the front cover.
ANSI/VITA 48.5-2010
Copyright © VITA 2010. All Rights Reserved.
Table of Contents
1! Scope .................................................................................................................................................. 5!
1.1! Purpose ....................................................................................................................................... 5!
1.2! Mechanical Characteristics.......................................................................................................... 5!
1.3! Terminology ................................................................................................................................. 5!
1.3.1! Abbreviations.......................................................................................................................... 5!
1.3.2! 2-level Maintenance (2LM) ..................................................................................................... 6!
1.3.3! Special Word Usage............................................................................................................... 6!
2! References .......................................................................................................................................... 8!
2.1! 2.1 General References............................................................................................................... 8!
3! Definitions............................................................................................................................................ 9!
4! Plug-in unit requirements .................................................................................................................. 10!
4.1! Plug-in unit description .............................................................................................................. 10!
4.2! Plug-in unit construction ............................................................................................................ 13!
4.3! Clearances, Profile, and Pitch ................................................................................................... 13!
4.4! Plug-in unit identification ............................................................................................................ 13!
4.5! Thermal requirements................................................................................................................ 14!
4.6! Reliability ................................................................................................................................... 14!
4.7! Plug-in unit warp ........................................................................................................................ 14!
4.8! Personnel safety ........................................................................................................................ 14!
4.9! Plug-in unit covers ..................................................................................................................... 14!
4.10! EMI and ESD ............................................................................................................................. 14!
4.11! PWB characteristics................................................................................................................... 14!
4.12! Materials .................................................................................................................................... 14!
4.12.1! Toxic outgassing .............................................................................................................. 15!
4.12.2! Flammable material.......................................................................................................... 15!
4.12.3! Material affected by fungus.............................................................................................. 15!
4.12.4! Adhesive backed labels ................................................................................................... 15!
4.12.5! Hazardous components and materials............................................................................. 15!
4.13! Finishes and protective treatments............................................................................................ 15!
4.13.1! Conformal coating............................................................................................................ 15!
5! Plug-in unit interface requirements.................................................................................................... 16!
5.1! Mechanical configuration ........................................................................................................... 16!
5.2! Plug-in unit span ........................................................................................................................ 16!
5.3! Plug-in unit Pitch ........................................................................................................................ 16!
5.4! Heat exchanger (core)/plug-in unit frame .................................................................................. 18!
5.5! Plug-in unit guide requirements ................................................................................................. 18!
5.5.1! Plug-in unit guide structure................................................................................................... 18!
5.5.2! Plug-in unit guide material.................................................................................................... 18!
5.5.3! Plug-in unit guide conductive path ....................................................................................... 19!
5.6! Plug-in unit header structure...................................................................................................... 19!
5.7! Connector .................................................................................................................................. 19!
5.8! Plug-in unit keying ..................................................................................................................... 19!
5.9! Durability.................................................................................................................................... 19!
ANSI/VITA 48.5-2010
Copyright © VITA 2010. All Rights Reserved.
5.10! Plug-in unit insertion and extraction........................................................................................... 20!
5.10.1! Plug-in unit insertion lever material .................................................................................. 20!
5.11! Plug-in unit retainers .................................................................................................................. 20!
6! Chassis Recommendations for VITA48.5 Plug-in Units .................................................................... 21!
6.1! Connectors ................................................................................................................................ 21!
6.2! Chassis ...................................................................................................................................... 21!
6.2.1! Chassis dimensions ............................................................................................................. 21!
6.2.2! Chassis seal ......................................................................................................................... 28!
6.3! Component Placement .............................................................................................................. 29!
6.4! Weight........................................................................................................................................ 29!
6.5! Thermal considerations ............................................................................................................. 29!
6.5.1! Mass airflow control.............................................................................................................. 30!
6.6! Mechanical bonding................................................................................................................... 30!
7! Appendix A: Acknowledgements....................................................................................................... 31!
7.1! Working Group Members........................................................................................................... 31!
List of Tables
Table 1-1: Term Definitions.......................................................................................................................... 9!
Table 3-1: Working Group Members.......................................................................................................... 31!
List of Figures
Figure 1 - Air-Flow-Through Plug-in Unit ................................................................................................... 10!
Figure 2 - Air-Flow-Through Plug-in Unit ................................................................................................... 11!
Figure 3 - Air-Flow-Through Plug-in unit.................................................................................................... 12!
Figure 4 - Air-Flow-Through Plug-in unit.................................................................................................... 13!
Figure 5 - Dimensional Requirements for Air-Flow-Through Plug-in unit .................................................. 17!
Figure 6 - Dimensional Recommendations for Injector / Extractor ............................................................ 18!
Figure 7 – Chassis Dimensional Recommendations ................................................................................. 22!
Figure 8 – Chassis Dimensional Recommendations ................................................................................. 23!
Figure 9 – Chassis Dimensional Recommendations ................................................................................. 24!
Figure 10 – Chassis Dimensional Recommendations ............................................................................... 25!
Figure 11 – Chassis Air Seal Recommendations ...................................................................................... 26!
Figure 12 – Chassis Air Seal Recommendations ...................................................................................... 27!
Figure 13 – Chassis Air Seal Recommendations ...................................................................................... 28!
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