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SIST EN 61709:2017

(Main)

Electric components - Reliability - Reference conditions for failure rates and stress models for conversion (IEC 61709:2017)

Electric components - Reliability - Reference conditions for failure rates and stress models for conversion (IEC 61709:2017)

NEW!IEC 61709:2017 is available as IEC 61709:2017 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61709:2017 gives guidance on the use of failure rate data for reliability prediction of electric components used in equipment. The method presented in this document uses the concept of reference conditions which are the typical values of stresses that are observed by components in the majority of applications.  Reference conditions are useful since they provide a known standard basis from which failure rates can be modified to account for differences in environment from the environments taken as reference conditions. Each user can use the reference conditions defined in this document or use their own. When failure rates stated at reference conditions are used it allows realistic reliability predictions to be made in the early design phase. The stress models described herein are generic and can be used as a basis for conversion of failure rate data given at these reference conditions to actual operating conditions when needed and this simplifies the prediction approach. Conversion of failure rate data is only possible within the specified functional limits of the components. This document also gives guidance on how a database of component failure data can be constructed to provide failure rates that can be used with the included stress models. Reference conditions for failure rate data are specified, so that data from different sources can be compared on a uniform basis. If failure rate data are given in accordance with this document then additional information on the specified conditions can be dispensed with. This document does not provide base failure rates for components – rather it provides models that allow failure rates obtained by other means to be converted from one operating condition to another operating condition. The prediction methodology described in this document assumes that the parts are being used within its useful life. The methods in this document have a general application but are specifically applied to a selection of component types as defined in Clauses 6 to 20 and I.2. This third edition cancels and replaces the second edition, published in 2011. This edition constitutes a technical revision. This third edition is a merger of IEC 61709:2011 and IEC TR 62380:2004.
This edition includes the following significant technical changes with respect to the previous edition: addition of 4.5 Components choice, 4.6 Reliability growth during the deployment phase of new equipment, 4.7 How to use this document, and of Clause 19 Printed circuit boards (PCB) and Clause 20 Hybrid circuits with respect to IEC TR 62380; addition of failure modes of components in Annex A; modification of Annex B, Thermal model for semiconductors, adopted and revised from IEC TR 62380; modification of Annex D, Considerations on mission profile; modification of Annex E, Useful life models, adopted and revised from IEC TR 62380; revision of Annex F (former B.2.6.4), Physics of failure; addition of Annex G (former Annex C), Considerations for the design of a data base on failure rates, complemented with parts of IEC 60319;  addition of Annex H, Potential sources of failure rate data and methods of selection; addition of Annex J, Presentation of component reliability data, based on IEC 60319.
Keywords: failure rate data, reliability prediction of electric components

Elektrische Bauelemente - Zuverlässigkeit - Referenzbedingungen für Ausfallraten und Beanspruchungsmodelle zur Umrechnung (IEC 61709:2017)

Composants électriques - Fiabilité - Conditions de référence pour les taux de défaillance et modèles de contraintes pour la conversion (IEC 61709:2017)

NEW!IEC 61709:2017 est disponible sous forme de IEC 61709:2017 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.

IEC 61709:2017 donne des recommandations concernant l'utilisation des données de taux de défaillance pour les prévisions de fiabilité de composants électriques utilisés dans les équipements. La méthode exposée dans le présent document utilise le concept des conditions de référence, qui sont les valeurs typiques des contraintes observées sur les composants dans la plupart des applications. Les conditions de référence sont utiles dans la mesure où elles fournissent une base normalisée connue à partir de laquelle les taux de défaillance peuvent être modifiés afin de prendre en compte les différences observées dans l'environnement en fonction des environnements pris comme conditions de référence. Chaque utilisateur peut appliquer les conditions de référence définies dans le présent document ou bien appliquer ses propres conditions de référence. Lorsque les taux de défaillance indiqués dans les conditions de référence sont utilisés, cela permet de réaliser des prévisions de fiabilité réalistes dès la première phase de conception. Les modèles de contraintes décrits dans le présent document sont génériques et peuvent être utilisés comme base de conversion des données de taux de défaillance dans ces conditions de référence, dans des conditions de fonctionnement réelles si nécessaire, ce qui simplifie l'approche prévisionnelle. La conversion des données de taux de défaillance n'est possible que dans les limites de fonctionnement spécifiées pour les composants. Le présent document donne également des recommandations concernant les méthodes pour constituer une base de données de taux de défaillance des composants afin que les taux fournis puissent être employés avec les modèles de contraintes fournis. Les conditions de référence pour les données de taux de défaillance sont définies, de façon à permettre de comparer, dans des conditions uniformes, des données d'origines différentes. Si les données de taux de défaillance sont fournies conformément au présent document, il est possible de se dispenser d'information supplémentaire sur les conditions définies Le présent document ne fournit pas des taux de défaillance de base pour les composants; elle fournit en revanche des modèles qui permettent de convertir les taux de défaillance obtenus par d'autres moyens d’une condition de fonctionnement à l’autre. La méthodologie de prévision décrite dans le présent document pose comme hypothèse l'utilisation des éléments au cours de leur durée de vie. Les méthodes décrites dans le présent document ont une application générale, mais s’appliquent spécifiquement à une sélection de types de composants définis de l’Article 6 à l’Article 20 et en I.2. Cette troisième édition annule et remplace la deuxième édition, parue en 2011. Cette édition constitue une révision technique. Cette troisième édition constitue une fusion entre l’IEC 61709:2011 et l’IEC TR 62380:2004.
Cette édition inclut  les modifications techniques majeures suivantes par rapport à l’édition précédente: ajout de 4.5 Choix des composants, 4.6 Croissance de la fiabilité pendant la phase de déploiement du nouvel équipement, 4.7 Méthode d’utilisation du présent docume

Električne komponente - Zanesljivost - Referenčni pogoji za pogostost odpovedi in modele obremenjevanja za pretvarjanje (IEC 61709:2017)

Ta dokument podaja napotke o uporabi podatkov o pogostosti odpovedi za napoved zanesljivosti električnih komponent v opremi.
Metoda, predstavljena v tem dokumentu, uporablja koncept referenčnih pogojev, ki so tipične vrednosti obremenitev, ki se pojavljajo pri komponentah v večini načinov uporabe.
Referenčni pogoji so uporabni, ker podajajo poznano osnovo standarda, na podlagi katere se lahko spremenijo pogostosti odpovedi, da se upoštevajo razlike okolja od okolij, ki predstavljajo referenčne pogoje. Vsak uporabnik lahko uporabi referenčne pogoje, določene v tem dokumentu, ali lastne referenčne pogoje. Kadar so v referenčnih pogojih uporabljene pogostosti odpovedi, to omogoča realistično napoved zanesljivosti v zgodnji fazi načrtovanja.
V tem dokumentu opisani modeli obremenjevanja so generični in se lahko po potrebi uporabijo kot osnova za pretvarjanje podatkov o pogostosti odpovedi, podanih v teh referenčnih pogojih, v dejanske obratovalne pogoje, kar poenostavlja pristop k napovedi. Pretvarjanje podatkov o pogostosti odpovedi je mogoče le znotraj podanih funkcijskih omejitev komponent.
Ta dokument podaja tudi napotke, kako zdelati zbirko podatkov o odpovedih komponent, ki podaja pogostosti odpovedi, ki se lahko uporabijo z vključenimi modeli obremenjevanja.
Referenčni pogoji za podatke o pogostosti odpovedi so podani, tako da je mogoče podatke iz drugih virov primerjati na enotni osnovi. Če so podatki o pogostosti odpovedi podani v skladu s tem dokumentom, se lahko dodatne informacije o podanih pogojih izpustijo.
Ta dokument ne podaja osnovnih pogostosti odpovedi za komponente, ampak podaja modele, ki omogočajo pretvarjanje pogostosti odpovedi, pridobljenih z drugimi sredstvi, iz enega obratovalnega pogoja v drug obratovalni pogoj.
Metodologija napovedi, opisana v tem dokumentu, predpostavlja, da se deli uporabljajo v življenjski dobi. Metode v tem dokumentu so splošno uporabne, vendar se uporabljajo posebej za izbiro tipov komponent, kot določajo točke od 6 do 20 in točka I.2.

General Information

Status
Published
Publication Date
01-Jun-2017
ICS
21.020 - Characteristics and design of machines, apparatus, equipment
31.020 - Electronic components in general
Technical Committee
I11 - Imaginarni 11
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
24-May-2017
Due Date
29-Jul-2017
Completion Date
02-Jun-2017
Ref Project
EN 61709:2017 - Electric components - Reliability - Reference conditions for failure rates and stress models for conversion

Relations

Replaces
SIST EN 61709:2011 - Electric components - Reliability - Reference conditions for failure rates and stress models for conversion
Effective Date
23-May-2017
Corrected By
SIST EN 61709:2017/AC:2020 - Electric components - Reliability - Reference conditions for failure rates and stress models for conversion (IEC 61709:2017/COR1:2019)
Effective Date
05-Nov-2019
Revised
SIST EN 61709:2011 - Electric components - Reliability - Reference conditions for failure rates and stress models for conversion
Effective Date
13-Oct-2015

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SLOVENSKI STANDARD
01-julij-2017
1DGRPHãþD
SIST EN 61709:2011
(OHNWULþQHNRPSRQHQWH=DQHVOMLYRVW5HIHUHQþQLSRJRML]DSRJRVWRVWRGSRYHGLLQ
PRGHOHREUHPHQMHYDQMD]DSUHWYDUMDQMH ,(&
Electric components - Reliability - Reference conditions for failure rates and stress
models for conversion (IEC 61709:2017)
Elektrische Bauelemente - Zuverlässigkeit - Referenzbedingungen für Ausfallraten und
Beanspruchungsmodelle zur Umrechnung (IEC 61709:2017)
Composants électriques - Fiabilité - Conditions de référence pour les taux de défaillance
et modèles de contraintes pour la conversion (IEC 61709:2017)
Ta slovenski standard je istoveten z: EN 61709:2017
ICS:
21.020 =QDþLOQRVWLLQQDþUWRYDQMH Characteristics and design of
VWURMHYDSDUDWRYRSUHPH machines, apparatus,
equipment
31.020 Elektronske komponente na Electronic components in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 61709
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2017
ICS 31.020 Supersedes EN 61709:2011
English Version
Electric components - Reliability - Reference conditions for
failure rates and stress models for conversion
(IEC 61709:2017)
Composants électriques - Fiabilité - Conditions de référence Bauelemente der Elektronik - Zuverlässigkeit -
pour les taux de défaillance et modèles de contraintes pour Referenzbedingungen für Ausfallraten und
la conversion Beanspruchungsmodelle zur Umrechnung
(IEC 61709:2017) (IEC 61709:2017)
This European Standard was approved by CENELEC on 2017-03-24. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61709:2017 E
European foreword
The text of document 56/1714/FDIS, future edition 3 of IEC 61709, prepared by
IEC/TC 56 "Dependability" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 61709:2017.
The following dates are fixed:
(dop) 2017-12-24
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2020-03-24
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61709:2011.

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 61709:2017 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 60300-3-2:2004 NOTE Harmonized as EN 60300-3-2:2005.
IEC 60300-3-3 NOTE Harmonized as EN 60300-3-3.
IEC 60721 (series) NOTE Harmonized as EN 60721 (series).
IEC 60721-3-3 NOTE Harmonized as EN 60721-3-3.
IEC 60721-3-4 NOTE Harmonized as EN 60721-3-4.
IEC 60721-3-5 NOTE Harmonized as EN 60721-3-5.
IEC 60721-3-7 NOTE Harmonized as EN 60721-3-7.
IEC 61014:2003 NOTE Harmonized as EN 61014:2003.
IEC 61360 (series) NOTE Harmonized as EN 61360 (series).
IEC 61360-1:2009 NOTE Harmonized as EN 61360-1:2010.
IEC 61360-4:2005 NOTE Harmonized as EN 61360-4:2005.
IEC 61508 (series) NOTE Harmonized as EN 61508 (series).
IEC 61649:2008 NOTE Harmonized as EN 61649:2008.
IEC 61703:2002 NOTE Harmonized as EN 61703:2002.
IEC 61710 NOTE Harmonized as EN 61710.
IEC 61810-2:2011 NOTE Harmonized as EN 61810-2:2011.
IEC 61810-2-1:2011 NOTE Harmonized as EN 61810-2-1:2011.
IEC 62007 (series) NOTE Harmonized as EN 62007 (series).
IEC 62741 NOTE Harmonized as EN 62741.
IEC 62308:2006 NOTE Harmonized as EN 62308:2006.

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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 60050-192 2015 International electrotechnical vocabulary - - -
Part 192: Dependability
IEC 61709 ®
Edition 3.0 2017-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electric components – Reliability – Reference conditions for failure rates and

stress models for conversion
Composants électriques – Fiabilité – Conditions de référence pour les taux de

défaillance et modèles de contraintes pour la conversion

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.020 ISBN 978-2-8322-3902-5

– 2 – IEC 61709:2017 © IEC 2017
CONTENTS
FOREWORD . 9
INTRODUCTION . 11
1 Scope . 12
2 Normative references . 12
3 Terms, definitions and symbols . 12
3.1 Terms and definitions. 12
3.2 Symbols . 16
4 Context and conditions . 17
4.1 Failure modes and mechanisms . 17
4.2 Thermal modelling . 18
4.3 Mission profile consideration . 18
4.3.1 General . 18
4.3.2 Operating and non-operating conditions . 18
4.3.3 Dormancy . 19
4.3.4 Storage . 19
4.4 Environmental conditions . 19
4.5 Components choice . 21
4.6 Reliability growth during the deployment phase of new equipment . 22
4.7 How to use this document . 23
5 Generic reference conditions and stress models . 24
5.1 Recommended generic reference conditions . 24
5.2 Generic stress models . 25
5.2.1 General . 25
5.2.2 Stress factor for voltage dependence, π . 26
U
5.2.3 Stress factor for current dependence, π . 26
I
5.2.4 Stress factor for temperature dependence, π . 26
T
5.2.5 Environmental application factor, π . 28
E
5.2.6 Dependence on switching rate, π . 28
S
5.2.7 Dependence on electrical stress, . 29
π
ES
5.2.8 Other factors of influence . 29
6 Integrated semiconductor circuits . 29
6.1 Specific reference conditions . 29
6.2 Specific stress models . 31
6.2.1 General . 31
6.2.2 Voltage dependence, factor . 32
π
U
6.2.3 Temperature dependence, factor . 32
π
T
7 Discrete semiconductors . 35
7.1 Specific reference conditions . 35
7.2 Specific stress models . 36
7.2.1 General . 36
7.2.2 Voltage dependence for transistors, factor π . 37
U
7.2.3 Temperature dependence, factor π . 37
T
8 Optoelectronic components . 39

IEC 61709:2017 © IEC 2017 – 3 –
8.1 Specific reference conditions . 39
8.2 Specific stress models . 41
8.2.1 General . 41
8.2.2 Voltage dependence, factor π . 41
U
8.2.3 Current dependence, factor π . 41
I
8.2.4 Temperature dependence, factor π . 42
T
9 Capacitors . 44
9.1 Specific reference conditions . 44
9.2 Specific stress model . 44
9.2.1 General . 44
9.2.2 Voltage dependence, factor π . 44
U
9.2.3 Temperature dependence, factor π . 46
T
10 Resistors and resistor networks . 47
10.1 Specific reference conditions . 47
10.2 Specific stress models . 48
10.2.1 General . 48
10.2.2 Temperature dependence, factor π . 48
T
11 Inductors, transformers and coils . 49
11.1 Re
...

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This document gives guidance on the use of failure rate data for reliability prediction of
electric components used in equipment.
The method presented in this document uses the concept of reference conditions which are
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SIST
SIST EN ISO/IEC 27555:2025(Main)
Information security, cybersecurity and privacy protection - Guidelines on personally identifiable information deletion (ISO/IEC 27555:2021)
EN ISO/IEC 27555:2025

The standard contains guidelines for developing and establishing policies and procedures for deletion
of PII in organizations by specifying:
—   a harmonized terminology for PII deletion;
—   an approach for defining deletion rules in an efficient way;
—   a description of required documentation; and
—   a broad definition of roles, responsibilities and processes.
This document is intended to be used by organizations where PII are stored or processed.
This document does not address:
—   specific legal provision, as given by national law or specified in contracts;
—   specific deletion rules for particular clusters of PII as are to be defined by PII controllers for
—   processing PII;
—   deletion mechanisms;
—   reliability, security and suitability of deletion mechanisms;
—   specific techniques for de-identification of data.

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SIST
SIST EN ISO 9038:2025(Main)
Determination of sustained combustibility of liquids (ISO 9038:2025)
EN ISO 9038:2025

This document specifies a procedure, at temperatures up to 100 °C, to determine whether a liquid product, that would be classified as “flammable” by virtue of its flash point, sustains combustion at the temperature(s) specified, for example, in regulations.
NOTE            Many national and international regulations classify liquids as presenting a flammable hazard based on their flash point, as determined by a recognized method. Some of these regulations allow a derogation if the substance cannot “sustain combustion” at some specified temperature(s).
The procedure is applicable to paints (including water-borne paints), varnishes, paint binders, solvents, petroleum or related products and adhesives, that have a flash point. It is not applicable to painted surfaces in respect of assessing their potential fire hazards.
This test method is applicable, in addition to test methods for flash point, for assessing the fire hazard of a product.

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SIST EN 81-41:2025(Main)
Safety rules for the construction and installation of lifts - Special lifts for the transport of persons and goods - Part 41: Vertical lifting platforms intended for use by persons with impaired mobility
EN 81-41:2024

1.1   This draft European Standard deals with safety requirements for construction, manufacturing, installation, maintenance and dismantling of electrically powered vertical lifting platforms affixed to a building structure intended for use by persons with impaired mobility:
-   travelling vertically between predefined levels along a guided path whose inclination to the vertical does not exceed 15°;
-   intended for use by persons with or without a wheelchair;
-   supported or sustained by rack and pinion, rope traction drive, noncircular elastomeric-coated steel suspension members (hereafter called flat belt) traction drive, rope positive drive, chains, toothed belts, screw and nut, guided chain, scissors mechanism or hydraulic jack (direct or indirect);
-   with enclosed liftways;
-   with a speed not greater than 0,15 m/s;
-   with platforms where the carrier is not completely enclosed.
1.2   This draft European Standard deals with all significant hazards relevant to lifting platforms, when they are used as intended and under the conditions foreseen by the manufacturer (see Clause 4).
1.3   This draft European Standard does not specify the additional requirements for:
-   operation in severe conditions (e.g. extreme climates, strong magnetic fields);
-   lightning protection;
-   operation subject to special rules (e.g. potentially explosive atmospheres);
-   handling of materials, the nature of which could lead to dangerous situations;
-   vertical lifting platforms whose primary function is the transportation of goods;
-   vertical lifting platforms whose carriers are completely enclosed;
-   vertical lifting platforms prone to vandalism;
-   hazards occurring during manufacture;
-   earthquakes, flooding;
-   firefighting, evacuation and behaviour during a fire;
-   noise and vibrations;
-   the design of concrete, hard core, timber or other foundation or building arrangement;
-   the design of anchorage bolts to the supporting structure;
-   type C wheelchairs as defined in EN 12183 and/or EN 12184.
NOTE   For the actual type of machinery, noise is not considered a significant nor relevant hazard.
1.4   This draft European Standard is not applicable to Vertical Lifting Platforms intended for use by persons with impaired mobility which are manufactured before the date of its publication as an EN.

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