SIST EN IEC 62435-8:2020

Electronic components - Long-term storage of electronic semiconductor devices - Part 8: Passive elecronic devices (IEC 62435-8:2020)

This part of the IEC 62435 series on long-term storage is applied to passive electronic devices
in long-term storage that can be used as part of obsolescence mitigation strategy. Longterm
storage refers to a duration that can be more than 12 months for product scheduled for
storage. Storage typically begins when components are packed at the originating supplier
where the pack date or date code are assigned to the product. It is the responsibility of the
distributor and the customer to control and manage the aging inventory upon receipt of the
dated product. Alternatively, a supplier-customer agreement can be established to manage
the aging inventory. Philosophy, good working practice, and general means to facilitate the
successful long-term storage of electronic components are also addressed.

Elektronische Bauteile - Langzeitlagerung elektronischer Halbleiterbauelemente - Teil 8: Passive elektronische Bauelemente (IEC 62435-8:2020)

Composants électroniques - Stockage de longue durée des dispositifs électroniques à semiconducteurs - Partie 8 : Dispositifs électroniques passifs (IEC 62435-8:2020)

IEC 62435-8:2020 relative au stockage de longue durée s’applique aux dispositifs électroniques passifs à stockage de longue durée qui peuvent être utilisés dans le cadre d’une stratégie de réduction de l’obsolescence. Le stockage de longue durée fait référence à une durée qui peut être supérieure à 12 mois, pour un produit destiné à être stocké. Le stockage commence généralement avec l’emballage des composants dans les locaux du fournisseur d’origine et l’attribution au produit de la date d’emballage ou du code de date. Le distributeur et le client sont tenus de contrôler et gérer le stock des produits vieillissants à réception du produit marqué d’une date. En variante, un accord fournisseur‑client peut être mis en place pour gérer le stock des produits vieillissants. Les concepts, les bonnes pratiques de travail et les moyens généraux de nature à faciliter les bonnes conditions de stockage de longue durée des composants électroniques sont aussi traités.

Elektronske komponente - Dolgoročno skladiščenje elektronskih polprevodniških elementov - 8. del: Pasivne elektronske naprave (IEC 62435-8:2020)

General Information

• Status: Published
• Publication Date: 14-Sep-2020
• ICS: 31.080.01 - Semiconductor devices in general
• Technical Committee: I11 - Imaginarni 11
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 11-Sep-2020
• Due Date: 16-Nov-2020
• Completion Date: 15-Sep-2020
• Ref Project: EN IEC 62435-8:2020 - Electronic components - Long-term storage of electronic semiconductor devices - Part 8: Passive electronic devices

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 62435-8:2020
01-november-2020
Elektronske komponente - Dolgoročno skladiščenje elektronskih polprevodniških
elementov - 8. del: Pasivne elektronske naprave (IEC 62435-8:2020)
Electronic components - Long-term storage of electronic semiconductor devices - Part 8:
Passive elecronic devices (IEC 62435-8:2020)
Elektronische Bauteile - Langzeitlagerung elektronischer Halbleiterbauelemente - Teil 8:
Passive elektronische Bauelemente (IEC 62435-8:2020)
Composants électroniques - Stockage de longue durée des dispositifs électroniques à
semiconducteurs - Partie 8 : Dispositifs électroniques passifs (IEC 62435-8:2020)
Ta slovenski standard je istoveten z: EN IEC 62435-8:2020
ICS:
31.080.01 Polprevodniški elementi Semiconductor devices in
(naprave) na splošno general
SIST EN IEC 62435-8:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 62435-8:2020

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SIST EN IEC 62435-8:2020


EUROPEAN STANDARD EN IEC 62435-8

NORME EUROPÉENNE

EUROPÄISCHE NORM
August 2020
ICS 31.020

English Version
Electronic components - Long-term storage of electronic
semiconductor devices - Part 8: Passive electronic devices
(IEC 62435-8:2020)
Composants électroniques - Stockage de longue durée des Elektronische Bauteile - Langzeitlagerung elektronischer
dispositifs électroniques à semiconducteurs - Partie 8 : Halbleiterbauelemente - Teil 8: Passive elektronische
Dispositifs électroniques passifs Bauelemente
(IEC 62435-8:2020) (IEC 62435-8:2020)
This European Standard was approved by CENELEC on 2020-08-12. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 62435-8:2020 E

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SIST EN IEC 62435-8:2020
EN IEC 62435-8:2020 (E)
European foreword
The text of document 47/2595/CDV, future edition 1 of IEC 62435-8, prepared by IEC/TC 47
"Semiconductor devices" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 62435-8:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-05-12
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-08-12
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 62435-8:2020 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60721-3-1 NOTE Harmonized as EN IEC 60721-3-1
IEC/TR 62258-3 NOTE Harmonized as CLC/TR 62258-3
IEC 62435-1 NOTE Harmonized as EN 62435-1
IEC 62435-2 NOTE Harmonized as EN 62435-2
IEC 62435-3 NOTE Harmonized as EN IEC 62435-3
IEC 62435-4 NOTE Harmonized as EN IEC 62435-4
IEC 62435-5 NOTE Harmonized as EN 62435-5
IEC 62435-6 NOTE Harmonized as EN IEC 62435-6
1 2
IEC 62435-7 NOTE Harmonized as EN IEC 62435-7


1
Under preparation. Stage at the time of publication: IEC AFDIS 62435-7:2020.
2
Under preparation. Stage at the time of publication: prEN IEC 62435-7:2019.
2

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EN IEC 62435-8:2020 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60749-20 - Semiconductor devices - Mechanical and EN 60749-20 -
climatic test methods - Part 20: Resistance of
plastic encapsulated SMDs to the combined
effect of moisture and soldering heat
IEC 60749-20-1 - Semiconductor devices - Mechanical and - -
climatic test methods - Part 20-1: Handling,
packing, labelling and shipping of surface-
mount devices sensitive to the combined
effect of moisture and soldering heat
IEC 61760-4 - Surface mounting technology - Part 4: EN 61760-4 -
Classification, packaging, labelling and
handling of moisture sensitive devices
JEDEC J-STD-075 - Classification of non-IC electronic components - -
for assembly processes


3

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IEC 62435-8

®


Edition 1.0 2020-07




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Electronic components – Long-term storage of electronic semiconductor

devices –

Part 8: Passive electronic devices



Composants électroniques – Stockage de longue durée des dispositifs

électroniques à semiconducteurs –


Partie 8: Dispositifs électroniques passifs













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 31.020 ISBN 978-2-8322-8560-2




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN IEC 62435-8:2020
– 2 – IEC 62435-8:2020 © IEC 2020
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Storage considerations . 9
4.1 Overview of passive components . 9
4.2 Failure mechanisms . 9
4.2.1 Occurrence of failure and driving force . 9
4.2.2 Storage environment and mitigation for stimuli to prevent failure . 11
4.3 Materials management . 11
4.4 Storage media . 12
4.5 Documentation/paper lot identifiers . 12
4.6 Inventory check. 12
4.7 Inventory dry packing refreshing . 12
4.8 Inventory re-assessment . 13
5 Baseline long-term storage requirements . 13
5.1 General . 13
5.2 Moisture sensitivity designation . 13
5.3 Dry packing for storage . 13
5.4 Non-moisture sensitive storage . 13
5.4.1 General . 13
5.4.2 Storage media . 13
5.4.3 Lot data and labelling . 13
5.5 Storage of moisture sensitive finished devices . 14
5.5.1 Moisture barrier bag . 14
5.5.2 Dunnage . 14
5.5.3 Humidity indicator card . 14
5.5.4 Desiccant . 14
5.5.5 Labelling . 14
5.5.6 Lot data and labelling . 15
5.5.7 Storage environment . 15
5.5.8 Process (temperature) sensitivity designation . 15
Annex A (informative) Passive electronic device storage environment considerations . 16
Bibliography . 17

Table 1 – Failure mechanisms in storage and stimuli to mitigate during storage. . 10
Table 2 – Long-term environment – sustained condition requirements . 11
Table 3 – Considerations for management, control and documentation during storage . 12
Table A.1 – Long-term storage environment – sustained condition considerations . 16

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IEC 62435-8:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ELECTRONIC COMPONENTS – LONG-TERM STORAGE
OF ELECTRONIC SEMICONDUCTOR DEVICES –

Part 8: Passive electronic devices

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote interna-
tional co-operation on all questions concerning standardization in the electrical and electronic fields. To this
end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Tech-
nical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publica-
tion(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the
subject dealt with may participate in this preparatory work. International, governmental and non-governmental
organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the Interna-
tional Organization for Standardization (ISO) in accordance with conditions determined by agreement between
the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all inter-
ested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinter-
pretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence be-
tween any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and ex-
penses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publica-
tions.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62435-8 has been prepared by subcommittee IEC technical com-
mittee 47: Semiconductor devices.
The text of this International Standard is based on the following documents:
CDV Report on voting
47/2595/CDV 47/2618/RVC

Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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SIST EN IEC 62435-8:2020
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A list of all the 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 "http://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.

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SIST EN IEC 62435-8:2020
IEC 62435-8:2020 © IEC 2020 – 5 –
INTRODUCTION
This document applies to the long-term storage of passive electronic components.
This is a standard for 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 aer-
onautical field, the railway industry or the energy sector.
The many solutions enabling obsolescence to be resolved are now identified. However, se-
lecting one of these solutions should be preceded by a case-by-case technical and economic
feasibility study, depending on whether storage is envisaged for field service or production,
for example:
• remedial storage as soon as components are no longer marketed;
• preventive storage anticipating declaration of obsolescence.
Taking into account the expected life of some installations, sometimes covering several dec-
ades, the qualification times, and the unavailability costs, which can also be very high, the
solution to be adopted to resolve obsolescence should often be rapidly implemented. This is
why the solution retained in most cases consists in systematically storing components which
are in the process of becoming obsolescent.
The technical risks of this solution are, a priori, fairly low. However, it requires perfect mastery
of the implemented process and especially of the storage environment, although this mastery
becomes critical when it comes to long-term storage.
All handling, protection, storage and test operations are recommended to be performed ac-
cording to the state of the art.
The application of the approach proposed in this document in no way guarantees that the
stored components are in perfect operating condition at the end of this storage. It only com-
prises a means of minimizing potential and probable degradation factors.
Some electronic device users have the need to store electronic devices for long periods of
time. Lifetime buys are commonly made to support production runs of assemblies that well
exceed the production timeframe of its individual parts. This puts the user in a situation re-
quiring careful and adequate storage of such parts to maintain the as-received solderability
and minimize any degradation effects to the part over time. Major degradation concerns are
moisture, electrostatic fields, ultraviolet light, large variations in temperature, air-borne con-
taminants, and outgassing.
Warranties and sparing also present a challenge for the user or repair agency as some sys-
tems have been designated to be used for long periods of time, in some cases for up to
40 years or more. Some of the devices needed for repair of these systems will not be availa-
ble from the original supplier for the lifetime of the system or the spare assembly may be built
with the original production run but then require long-term storage. This document was devel-
oped to provide a standard for storing electronic devices for long periods of time. For storage

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of devices that are moisture sensitive but that do not need to be stored for long periods of
time, IEC TR 62258-3 can be consulted.
Long-term storage assumes that the device is going to be placed in uninterrupted storage for
a number of years. It is essential that it is useable after storage. Particular attention should be
paid to storage media surrounding the devices together with the local environment.
These guidelines do not imply any warranty of product or guarantee of operation beyond the
storage time given by the manufacturer.
The IEC 62435 series is intended to ensure that adequate reliability is achieved for devices in
user applications after long-term storage. Users are encouraged to request data from suppli-
ers to applicable specifications to demonstrate a successful storage life as requested by the
user. These standards are not intended to address built-in failure mechanisms that would take
place regardless of storage conditions.
These standards are intended to give practical guide to methods of long-duration storage of
electronic components where this is intentional or planned storage of product for a number of
years. Storage regimes for work-in-progress production are managed according to company
internal process requirements and are not detailed in this series of standards.
The overall standard is split into a number of parts. Parts 1 to 4 apply to any long-term stor-
age and contain general requirements and guidance, whereas Parts 5 to 9 are specific to the
type of product being stored. It is intended that the product specific part should be read
alongside the general requirements of Parts 1 to 4.
Electronic components requiring different storage conditions are planned to be covered sepa-
rately starting with Part 5.
The structure of the IEC 62435 series as currently conceived is as follows:
Part 1 – General
Part 2 – Deterioration mechanisms
Part 3 – Data
Part 4 – Storage
Part 5 – Die and wafer devices
Part 6 – Packaged or finished devices
Part 7 – MEMS
Part 8 – Passive electronic devices
Part 9 – Special cases

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SIST EN IEC 62435-8:2020
IEC 62435-8:2020 © IEC 2020 – 7 –
ELECTRONIC COMPONENTS – LONG-TERM STORAGE
OF ELECTRONIC SEMICONDUCTOR DEVICES –

Part 8: Passive electronic devices



1 Scope
This part of the IEC 62435 series on long-term storage is applied to passive electronic devic-
es in long-term storage that can be used as part of obsolescence mitigation strategy. Long-
term storage refers to a duration that can be more than 12 months for product scheduled for
storage. Storage typically begins when components are packed at the originating supplier
where the pack date or date code are assigned to the product. It is the responsibility of the
distributor and the customer to control and manage the aging inventory upon receipt of the
dated product. Alternatively, a supplier-customer agreement can be established to manage
the aging inventory. Philosophy, good working practice, and general means to facilitate the
successful long-term storage of electronic components are also addressed.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their con-
tent constitutes requirements of this document. For dated references, only the edition cited
applies. For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60749-20, Semiconductor devices – Mechanical and climatic test methods – Part 20: Re-
sistance of plastic encapsulated SMDs to the combined effect of moisture and soldering heat
IEC 60749-20-1, Semiconductor devices – Mechanical and climatic test methods – Part 20-1:
Handling, packing, labelling and shipping of surface-mount devices sensitive to the combined
effect of moisture and soldering heat
IEC 61760-4, Surface mounting technology – Part 4: Classification, packaging, labelling and
handling of moisture sensitive devices
JEDEC J-STD-075, Classification of non-IC electronic components for assembly processes
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following ad-
dresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
passive, adj
qualifies a circuit element or a circuit for which the time integral of
the instantaneous power cannot be negative over any time interval beginning at an instant
before the first supply of electric energy
EXAMPLE Resistor, inductor, capacitor, fuse, magnetic switch, crystal oscillator, diode, led

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Note 1 to entry: Under periodic conditions, the integration interval can comprise an integral number of periods
instead of beginning at minus infinity.
Note 2 to entry: A passive circuit normally does not contain voltage or current sources.
[SOURCE: IEC 60050-131:2002, 131-11-34, modified – A domain has been specified at the
beginning of the definition and some examples have been added.]
3.2
storage environment
specially controlled storage area, with particular control of temperature, humidity, atmosphere
and any other conditions depending on the product requirements
[SOURCE: IEC 62435-1:2017, 3.1.1]
3.3
critical moisture limit
maximum safe equilibrium moisture content for a specific encapsulated device at reflow as-
sembly or rework
3.4
long-term storage
LTS
planned storage of components to extend the life-cycle for a duration with the intention of
supporting future use
Note 1 to entry: Allowable storage durations will vary by form factor (e.g., packing materials, shape) and storage
conditions. In general, long-term storage is longer than 12 months.
[SOURCE: IEC 62435-1:2017, 3.1.2]
3.5
LTS storeroom
area containing components that have additional packaging for storage to protect from mois-
ture or from mechanical impact or for ease of identification or handling
3.6
moisture-sensitive device
MSD
device that has moisture absorption or moisture retention and whose quality or reliability is
affected by moisture
3.7
electronic device
packaged electrical, electronic, electro-mechanical (EEE) item, or assemblies using such
items
[SOURCE: IEC 62435-1:2017, 3.1.3]
3.8
desiccant
hygroscopic substance used to remove moisture from an atmosphere
3.9
moisture barrier bag
MBB
storage bag manufactured with a flexible laminated vapour barrier film that restricts the
transmission of water vapour
Note 1 to entry: Refer to IEC 60749-20-1 for packaging of moisture sensitive products.

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IEC 62435-8:2020 © IEC 2020 – 9 –
[SOURCE: IEC 62435-1:2017, 3.1.4]
3.10
humidity indicator card
HIC
card printed with a moisture sensitive chemical that changes from blue to pink in the presence
of water vapour
[SOURCE: IEC 62435-1:2017, 3.1.5, modified – The bracketed information "(cobalt bromide)"
has been removed from the definition.]
3.11
water vapour transmission rate
WVTR
measure of permeability of MBBs to water vapour
3.12
dunnage
all the matter stored in a moisture barrier bag that is additional to the packaged electronic
component
3.13
electro-static discharge
ESD
transfer of electric charge between bodies of different electrostatic potentials in proximity or
through direct contact
[SOURCE: IEC 60050-561:2014, 561-03-06]
4 Storage considerations
4.1 Overview of passive components
Passive components are not able to control current where the instantaneous power cannot be
negative therefore there is no power gain before the application of electric energy. Common
examples of passives are resistors, capacitors, inductors, transformers and diodes of all
types. Often electromechanical relays, quartz crystals and fuses are also to be considered
passive components for the purpose of long-term storage requirements. Passive components
are made using a wide range of technologies, materials and manufacturing processes.
Passive components are surface mounted to electronic packages, modules and boards as ei-
ther discrete components or packaged components that vary in size, typically larger than
1 mm in the smallest dimension. Passive miniaturization has led to packaged passives. Pas-
sives are also integrated or embedded into other packaged components, modules and boards.
Passive components can experience many of the same failure modes as other components
and the storage program should consider the end use and failure mechanisms related to the
function of the component. An example list below may be used as a basis for consideration in
storage related risk assessments.
4.2 Failure mechanisms
4.2.1 Occurrence
...