IEC 61709:2017

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Context and conditions
5 Generic reference conditions and stress models
6 Integrated semiconductor circuits
7 Discrete semiconductors
8 Optoelectronic components
9 Capacitors
10 Resistors and resistor networks
11 Inductors, transformers and coils
12 Microwave devices
13 Other passive components
14 Electrical connections
15 Connectors and sockets
16 Relays
17 Switches and push-buttons
18 Signal and pilot lamps
19 Printed circuit boards (PCB)
20 Hybrid circuits
Annex A (normative) - Failure modes of components
Annex B (informative) - Thermal model for
        semiconductors
Annex C (informative) - Failure rate prediction
Annex D (informative) - Considerations on mission
        profile
Annex E (informative) - Useful life models
Annex F (informative) - Physics of failure
Annex G (informative) - Considerations for the design
        of a data base on failure rates
Annex H (informative) - Potential sources of failure
        rate data and methods of selection
Annex I (informative) - Overview of component
        classification
Annex J (informative) - Presentation of component
        reliability data
Annex K (informative) - Examples
Bibliography

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.
The contents of the corrigendum of October 2019 have been included in this copy.
Keywords: failure rate data, reliability prediction of electric components