IEC 62435-9:2021

IEC 62435-9 ®
Edition 1.0 2021-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electronic components – Long-term storage of electronic semiconductor
devices –
Part 9: Special cases
Composants électroniques – Stockage de longue durée des dispositifs
électroniques à semiconducteurs –
Partie 9: Cas particuliers
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IEC 62435-9 ®
Edition 1.0 2021-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electronic components – Long-term storage of electronic semiconductor

devices –
Part 9: Special cases
Composants électroniques – Stockage de longue durée des dispositifs

électroniques à semiconducteurs –

Partie 9: Cas particuliers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.020 ISBN 978-2-8322-1016-3

– 2 – IEC 62435-9:2021 © IEC 2021
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Component storage cases . 9
5 Storage of memory devices . 9
5.1 General . 9
5.2 Semiconductor memory device types . 9
6 Storage of other devices and partial assembly . 11
6.1 General . 11
6.2 Wafer-level chip-scale packages . 11
6.3 Heterogeneous devices. 12
6.4 Modules . 12
7 Storage in alternative environments . 12
7.1 General . 12
7.2 Alternative environments . 12
7.3 Storage environment effect on use reliability . 13
Annex A (informative)  Customer-supplier interaction . 14
Bibliography . 15

Table 1 – Example failure mechanisms and stimuli for memory devices . 10
Table A.1 – Supplier – customer interaction template. 14

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRONIC COMPONENTS – LONG-TERM STORAGE
OF ELECTRONIC SEMICONDUCTOR DEVICES –

Part 9: Special cases
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 62435-9 has been prepared by IEC technical committee 47: Semiconductor devices. It is
an International Standard.
The text of this International Standard is based on the following documents:
DRAFT Report on voting
47/2700/FDIS 47/2716/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

– 4 – IEC 62435-9:2021 © IEC 2021
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 62435 series, published under the general title Electronic
components – Long-term storage of electronic semiconductor devices, can be found on the IEC
website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
INTRODUCTION
This document applies to the long-term storage of electronic components in special cases of
configuration. The custom-client relationship for storage of all cases is also included.
This document deals with the long-term storage (LTS) of electronic devices drawing on the best
long-term storage practices currently known. For the purposes of this document, LTS is defined
as any device storage whose duration can be more than 12 months for product scheduled for
long duration storage. While intended to address the storage of unpackaged semiconductors
and packaged electronic devices, nothing in this document precludes the storage of other items
under the storage levels defined herein.
Although it has always existed to some extent, obsolescence of electronic components and
particularly of integrated circuits, has become increasingly intense over the last few years.
Indeed, with the existing technological boom, the commercial life of a component has become
very short compared with the life of industrial equipment such as that encountered in the
aeronautical field, the railway industry or the energy sector.
Th
...