EN IEC 60384-21:2019

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.RGURþQDFestkondensatoren zur Verwendung in Geräten der Elektronik - Teil 21: Rahmenspezifikation - Oberflächenmontierbare Vielschichtkeramik-Festkondensatoren, Klasse 1 (IEC 60384-21:2019)Condensateurs fixes utilisés dans les équipements électroniques - Partie 21: Spécification intermédiaire: Condensateurs multicouches fixes à diélectriques en céramique pour montage en surface, de classe 1 (IEC 60384-21:2019)Fixed capacitors for use in electronic equipment - Part 21: Sectional specification - Fixed surface mount multilayer capacitors of ceramic dielectric, Class 1 (IEC 60384-21:2019)31.060.10Fiksni kondenzatorjiFixed capacitorsICS:Ta slovenski standard je istoveten z:EN IEC 60384-21:2019SIST EN IEC 60384-21:2019en01-maj-2019SIST EN IEC 60384-21:2019SLOVENSKI
STANDARDSIST EN 60384-21:20121DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN IEC 60384-21
March 2019 ICS 31.060.10
Supersedes
EN 60384-21:2012
English Version
Fixed capacitors for use in electronic equipment - Part 21: Sectional specification - Fixed surface mount multilayer capacitors of ceramic dielectric, Class 1 (IEC 60384-21:2019)
Condensateurs fixes utilisés dans les équipements électroniques - Partie 21: Spécification intermédiaire -Condensateurs multicouches fixes à diélectriques en céramique pour montage en surface, de classe 1 (IEC 60384-21:2019)
Festkondensatoren zur Verwendung in Geräten der Elektronik - Teil 21: Rahmenspezifikation - Oberflächenmontierbare Vielschichtkeramik-Festkondensatoren, Klasse 1 (IEC 60384-21:2019) This European Standard was approved by CENELEC on 2019-03-05. 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: Rue de la Science 23,
B-1040 Brussels © 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60384-21:2019 E SIST EN IEC 60384-21:2019

This document supersedes EN 60384-21:2012. 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 60384-21:2019 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to be added for the standard indicated: IEC 60384-14 NOTE Harmonized as EN 60384-14
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 60063 -
Preferred number series for resistors and capacitors EN 60063 -
IEC 60068-1 2013
Environmental testing - Part 1: General and guidance EN 60068-1 2014
IEC 60068-2-58 2015
Environmental testing - Part 2-58: Tests - Test Td: Test methods for solderability, resistance to dissolution of metallization and to soldering heat of surface mounting devices (SMD) EN 60068-2-58 2015
+ A1 2017
+ A1 2018
IEC 60384-1 2016
Fixed capacitors for use in electronic equipment - Part 1: Generic specification EN 60384-1 2016
IEC 61193-2 2007
Quality assessment systems - Part 2: Selection and use of sampling plans for inspection of electronic components and packages EN 61193-2 2007
ISO 3 1973
Preferred numbers - Series of preferred numbers - -
IEC 60384-21 Edition 3.0 2019-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Fixed capacitors for use in electronic equipment –
Part 21: Sectional specification – Fixed surface mount multilayer capacitors
of ceramic dielectric, Class 1
Condensateurs fixes utilisés dans les équipements électroniques –
Partie 21: Spécification intermédiaire – Condensateurs multicouches fixes à diélectriques en céramique pour montage en surface, de Classe 1
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE
ICS 31.060.10
ISBN 978-2-8322-6389-1
– 2 – IEC 60384-21:2019 © IEC 2019 CONTENTS FOREWORD . 6 1 Scope . 8 2 Normative references . 8 3 Terms and definitions . 8 4 Information to be given in a detail specification . 9 4.1 General . 9 4.2 Outline drawing and dimensions . 10 4.3 Mounting . 10 4.4 Rating and characteristics . 10 4.4.1 General . 10 4.4.2 Nominal capacitance range . 10 4.4.3 Particular characteristics . 10 4.4.4 Soldering . 10 4.5 Marking . 11 5 Marking . 11 5.1 General . 11 5.2 Information for marking . 11 5.3 Marking on the body . 11 5.4 Requirements for marking . 11 5.5 Marking of the packaging . 11 5.6 Additional marking . 11 6 Preferred ratings and characteristics . 11 6.1 Preferred characteristics . 11 6.2 Preferred values of ratings . 12 6.2.1 Rated temperature (TR) . 12 6.2.2 Rated voltage (UR) . 12 6.2.3 Category voltage (UC) . 12 6.2.4 Preferred values of nominal capacitance and associated tolerance values . 12 6.2.5 Temperature coefficient (α) . 13 6.2.6 Dimensions . 14 7 Quality assessment procedures . 15 7.1 Primary stage of manufacture . 15 7.2 Structurally similar components . 15 7.3 Certified records of released lots . 15 7.4 Qualification approval . 15 7.4.1 General . 15 7.4.2 Qualification approval on the basis of the fixed sample size procedures . 15 7.4.3 Tests . 16 7.5 Quality conformance inspection . 21 7.5.1 Formation of inspection lots . 21 7.5.2 Test schedule . 21 7.5.3 Delayed delivery . 21 7.5.4 Assessment levels . 21 8 Test and measurement procedures . 22 8.1 General . 22 SIST EN IEC 60384-21:2019

IEC 60384-21:2019 © IEC 2019 – 3 –
8.2 Preliminary drying . 22 8.3 Measuring conditions . 23 8.4 Mounting . 23 8.5 Visual examination and check of dimensions . 23 8.5.1 General . 23 8.5.2 Visual examination . 23 8.5.3 Requirements . 23 8.6 Electrical tests . 25 8.6.1 Capacitance . 25 8.6.2 Tangent of loss angle (tan δ) . 25 8.6.3 Insulation resistance . 26 8.6.4 Voltage proof . 26 8.7 Temperature coefficient (α) and temperature cycle drift . 27 8.7.1 General . 27 8.7.2 Preliminary drying . 27 8.7.3 Measuring conditions . 27 8.7.4 Requirements . 27 8.8 Shear test . 28 8.9 Substrate bending test . 28 8.9.1 General . 28 8.9.2 Initial measurement . 28 8.9.3 Final inspection . 28 8.10 Resistance to soldering heat . 28 8.10.1 General . 28 8.10.2 Initial measurement . 28 8.10.3 Test conditions . 28 8.10.4 Recovery . 30 8.10.5 Final inspection, measurements and requirements. 30 8.11 Solderability . 30 8.11.1 General . 30 8.11.2 Test conditions . 30 8.11.3 Recovery . 31 8.11.4 Final inspection, measurements and requirements. 31 8.12 Rapid change of temperature . 31 8.12.1 General . 31 8.12.2 Initial measurement . 31 8.12.3 Number of cycles . 31 8.12.4 Recovery . 32 8.12.5 Final inspection, measurements and requirements. 32 8.13 Climatic sequence. 32 8.13.1 General . 32 8.13.2 Initial measurement . 32 8.13.3 Dry heat . 32 8.13.4 Damp heat, cyclic, Test Db, first cycle . 32 8.13.5 Cold. 32 8.13.6 Damp heat, cyclic, Test Db, remaining cycles . 32 8.13.7 Final inspection, measurements and requirements. 33 8.14 Damp heat, steady state . 33 8.14.1 General . 33 SIST EN IEC 60384-21:2019

– 4 – IEC 60384-21:2019 © IEC 2019 8.14.2 Initial measurement . 33 8.14.3 Test conditions . 33 8.14.4 Recovery . 34 8.14.5 Final inspection, measurements and requirements. 34 8.15 Endurance . 34 8.15.1 General . 34 8.15.2 Initial measurement . 35 8.15.3 Test conditions . 35 8.15.4 Recovery . 35 8.15.5 Final inspection, measurements and requirements. 35 8.16 Robustness of terminations (only for capacitors with strip termination) . 36 8.16.1 General . 36 8.16.2 Test conditions . 36 8.16.3 Final inspection and requirements . 36 8.17 Component solvent resistance (if required) . 36 8.18 Solvent resistance of the marking (if required) . 36 8.19 Accelerated damp heat, steady state (if required) . 36 8.19.1 General . 36 8.19.2 Initial measurement . 37 8.19.3 Conditioning . 37 8.19.4 Recovery . 37 8.19.5 Final measurements . 37 Annex A (normative)
Guidance for the specification and coding of dimensions of fixed surface mount multilayer capacitors of ceramic dielectric, Class 1 . 38 Annex B (informative)
Combination of temperature coefficient and tolerance for the reference temperature of 25 °C . 39 Annex X (informative)
Cross-reference for reference to IEC 60384-21:2011 . 40 Bibliography . 41
Figure 1 – Fault: crack or fissure. 23 Figure 2 – Fault: crack or fissure. 23 Figure 3 – Separation or delamination . 24 Figure 4 – Exposed electrodes . 24 Figure 5 – Principal faces . 24 Figure 6 – Reflow temperature profile . 29 Figure A.1 – Dimensions . 38
Table 1 – Preferred tolerances on nominal capacitance . 12 Table 2 – Nominal temperature coefficient and tolerance . 13 Table 3 – Combination of temperature coefficient and tolerance . 14 Table 4 – Fixed sample size test plan for qualification approval – Assessment level EZ . 17 Table 5 – Tests schedule for qualification approval . 18 Table 6 – Lot-by-lot inspection . 22 Table 7 – Periodic tests . 22 Table 8 – Tangent of loss angle limits . 25 Table 9 – Test voltages . 27 SIST EN IEC 60384-21:2019

IEC 60384-21:2019 © IEC 2019 – 5 –
Table 10 – Temperature cyclic drift limits . 28 Table 11 – Reflow temperature profiles for Sn-Ag-Cu alloy . 29 Table 12 – Maximum capacitance change . 30 Table 13 – Maximum capacitance change . 32 Table 14 – Number of damp heat cycles . 33 Table 15 – Final inspection, measurements and requirements . 33 Table 16 – Test conditions for damp heat, steady state . 34 Table 17 – Final inspection, measurements and requirements . 34 Table 18 – Endurance test conditions (UC = UR) . 35 Table 19 – Endurance test conditions (UC ≠ UR) . 35 Table 20 – Final inspection, measurements and requirements . 36 Table 21 – Initial requirements . 37 Table 22 – Conditioning . 37 Table A.1 – Dimensions . 38 Table B.1 – Combination of temperature coefficient and tolerance for the reference temperature of 25 °C . 39 Table X.1 – Reference to IEC 60384-21 for clause/subclause . 40 Table X.2 – Reference to IEC 60384-21 for figure/table . 40
– 6 – IEC 60384-21:2019 © IEC 2019 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
FIXED CAPACITORS FOR USE IN ELECTRONIC EQUIPMENT –
Part 21: Sectional specification –
Fixed surface mount multilayer capacitors
of ceramic dielectric, Class 1
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 international 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, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(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 International 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 interested 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 misinterpretation 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 between 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 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 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 60384-21 has been prepared by IEC technical committee 40: Capacitors and resistors for electronic equipment. This third edition cancels and replaces the second edition published in 2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) revision of the structure in accordance with ISO/IEC Directives, Part 2:2016 to the extent practicable, and for harmonizing with IEC 60384-22; b) deletion of the description on the permissible reactive power in 6.2.2 because it is not appropriate for the purposes of this document; SIST EN IEC 60384-21:2019

IEC 60384-21:2019 © IEC 2019 – 7 –
c) the dimensions of 0201M in Annex A have been added. The text of this International Standard is based on the following documents: FDIS Report on voting 40/2639/FDIS 40/2651/RVD
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. A list of all parts in the IEC 60384 series, published under the general title Fixed capacitors for use in electronic equipment, 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.
– 8 – IEC 60384-21:2019 © IEC 2019 FIXED CAPACITORS FOR USE IN ELECTRONIC EQUIPMENT –
Part 21: Sectional specification –
Fixed surface mount multilayer capacitors
of ceramic dielectric, Class 1
1 Scope This part of IEC 60384 is applicable to fixed unencapsulated surface mount multilayer capacitors of ceramic dielectric, Class 1, for use in electronic equipment. These capacitors have metallized connecting pads or soldering strips and are intended to be mounted on printed boards, or directly onto substrates for hybrid circuits. Capacitors for electromagnetic interference suppression are not included, but are covered by IEC 60384-14. The object of this document is to prescribe preferred ratings and characteristics and to select from IEC 60384-1 the appropriate quality assessment procedures, tests and measuring methods and to give general performance requirements for this type of capacitor. Test severities and requirements prescribed in detail specifications referring to this sectional specification are of equal or higher performance levels; lower performance levels are not permitted. 2 Normative references 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. IEC 60063, Preferred number series for resistors and capacitors IEC 60068-1:2013, Environmental testing – Part 1: General and guidance IEC 60068-2-58:2015, Environmental testing – Part 2-58: Tests – Test Td – Test methods for solderability, resistance to dissolution of metallization and to soldering heat of surface mounting devices (SMD)
IEC 60068-2-58:2015/AMD1:2017 IEC 60384-1:2016, Fixed capacitors for use in electronic equipment – Part 1: Generic specification IEC 61193-2:2007, Quality assessment system – Part 2: Selection and use of sampling plans for inspection of electronic components and packages ISO 3:1973, Preferred numbers – Series of preferred numbers 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60384-1 and the following apply. SIST EN IEC 60384-21:2019

IEC 60384-21:2019 © IEC 2019 – 9 –
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1
surface mount multilayer capacitor multilayer capacitor whose small dimensions and nature or shape of terminations make it suitable for surface mounting in hybrid circuits and on printed boards 3.2
capacitor of ceramic dielectric, Class 1 capacitor specially designed and suited for resonant circuit application where low losses and high stability of capacitance are essential or where a precisely defined temperature coefficient is required, for example for compensating temperature effects in the circuit Note 1 to entry: The ceramic dielectric is defined by its nominal temperature coefficient (α). 3.3
subclass for a given nominal temperature coefficient, the subclass is defined by the tolerance on the temperature coefficient Note 1 to entry: See Table 2. Note 2 to entry: The nominal temperature coefficient value and its tolerance refer to the temperature interval of +20 °C to +85 °C, but because in practice TC curves are not strictly linear, it is necessary to define limiting capacitance deviation (∆C/C) for other temperatures (see Table 3). 3.4
category temperature range ambient temperature range for which the capacitor has been designed to operate continuously Note 1 to entry: This is given by the lower and upper category temperature. 3.5
rated temperature TR maximum ambient temperature at which the rated voltage may be continuously applied 3.6
rated voltage UR maximum DC voltage that may be applied continuously to a capacitor at any temperature between the lower category temperature and the rated temperature Note 1 to entry: The maximum DC voltage is the sum of the DC voltage and peak AC voltage or peak pulse voltage applied to the capacitor. 3.7
category voltage UC maximum voltage that can be applied continuously to a capacitor at its upper category temperature 4 Information to be given in a detail specification 4.1 General The detail specification shall be derived from the relevant blank detail specification. SIST EN IEC 60384-21:2019

– 10 – IEC 60384-21:2019 © IEC 2019 Detail specifications shall not specify requirements inferior to those of the generic, sectional or blank detail specification. When more severe requirements are included, they shall be listed in 1.9 of the detail specification and indicated in the test schedules, for example by an asterisk. The information given in 4.2 may be presented in tabular form if more convenient. The information in 4.2 to 4.5 shall be given in each detail specification and the values quoted should be selected from those given in the appropriate clause of this sectional specification. 4.2 Outline drawing and dimensions There shall be an illustration of the capacitors as an aid to easy recognition and for comparison of the capacitors with others. Dimensions and their associated tolerances, which affect interchangeability and mounting, shall be given in the detail specification. All dimensions shall be stated in millimetres; however, when the original dimensions are given in inches, the converted metric dimensions in millimetres shall be added. Normally the numerical values shall be given for the length, width and height of the body. When necessary, for example when a number of items (sizes and capacitance/voltage ranges) are covered by a detail specification, the dimensions and their associated tolerances shall be placed in a table below the drawing. When the configuration is other than described above, the detail specification shall state such dimensional information as will adequately describe the capacitors. 4.3 Mounting The detail specification shall give guidance on methods of mounting for normal use. Mounting for test and measurement purposes (when required) shall be in accordance with 8.4 of this sectional specification. 4.4 Rating and characteristics 4.4.1 General The ratings and characteristics shall be in accordance with the relevant clauses of this sectional specification, together with 4.4.2, 4.4.3 and 4.4.4. 4.4.2 Nominal capacitance range See 6.2.4.1. When products approved to the detail specification have different ranges, the following statement should be added: "The range of capacitance values available in each voltage range is given in the register of approvals, available for example on the IECQ on-line certificate system website: www.iecq.org". 4.4.3 Particular characteristics Additional characteristics may be listed when they are considered necessary to specify adequately the component for design and application purposes. 4.4.4 Soldering The detail specification shall prescribe the test methods, severities and requirements applicable for the solderability and the resistance to soldering heat tests. SIST EN IEC 60384-21:2019

IEC 60384-21:2019 © IEC 2019 – 11 –
4.5 Marking The detail specification shall specify the content of the marking on the capacitor and on the packaging. Deviations from Clause 5 of this sectional specification shall be specifically stated. 5 Marking 5.1 General See IEC 60384-1:2016, 2.4, with the details of 5.2 to 5.6. 5.2 Information for marking The information given in the marking is normally selected from the following list; the relative importance of each item is indicated by its position in the list: – nominal capacitance;
– rated voltage (DC voltage may be indicated by the symbol:
[IEC 60417-5031(2002-10)] or
); – tolerance on nominal capacitance; – temperature coefficient and its tolerance as applicable (in accordance with 6.2.5); – year and month (or week) of manufacture; – manufacturer’s name or trade mark; – climatic category; – manufacturer’s type designation; – reference to the detail specification. 5.3 Marking on the body These capacitors are generally not marked on the body. If some marking can be applied, they shall be clearly marked with as many as possible of the items stated in 5.2 as is considered useful. Any duplication of information in the marking on the capacitor should be avoided. 5.4 Requirements for marking Any marking shall be legible and not easily smeared or removed by rubbing with fingers. 5.5 Marking of the packaging The packaging containing the capacitor(s) shall be clearly marked with all the information listed in 5.2. 5.6 Additional marking Any additional marking shall be so applied that no confusion can arise. 6 Preferred ratings and characteristics 6.1 Preferred characteristics Preferred climatic categories only shall be given in the preferred characteristics. The capacitors covered by this document are classified into climatic categories in accordance with the general rules given in IEC 60068-1:2013, Annex A. SIST EN IEC 60384-21:2019

– 12 – IEC 60384-21:2019 © IEC 2019 The lower and upper category temperatures and the duration of the damp heat, steady state test shall be chosen from the following: – lower category temperature: −55 °C, −40 °C, −25 °C, −10 °C and +10 °C; – upper category temperature: +70 °C, +85 °C, +100 °C, +125 °C and +150 °C;
– duration of the damp heat,
steady state test (40 °C, 93 % RH): 4, 10, 21 and 56 days. The severities of the cold and dry heat tests are the lower and upper category temperatures respectively. NOTE The resistance to humidity resulting from the above climatic category is for the capacitors in their unmounted state. The climatic performance of the capacitors after mounting is greatly influenced by the mounting substrate, the mounting method (see 8.4) and the final coating. 6.2 Preferred values of ratings 6.2.1 Rated temperature (TR) For capacitors covered by this sectional specification, the rated temperature is equal to the upper category temperature, unless the upper category temperature exceeds 125 °C.
6.2.2 Rated voltage (UR) The preferred values of the rated voltage are the values of the R5 series of ISO 3. If other values are needed, they shall be chosen from the R10 series. The sum of the DC voltage and the peak AC voltage or the peak to peak AC voltage, whichever is the greater, applied to the capacitor shall not exceed the rated voltage. 6.2.3 Category voltage (UC) When the rated temperature is defined as the upper category temperature, the category voltage is equal to the rated voltage as defined in IEC 60384-1:2016, 2.2.5. If the upper category temperature exceeds 125 °C, or the rated voltages exceed 500 V, the category voltage shall be given in the detail specification. 6.2.4 Preferred values of nominal capacitance and associated tolerance values 6.2.4.1 Preferred values of nominal capacitance Nominal capacitance values shall be taken from the number series of IEC 60063; the E6, E12 and E24 series are preferred. 6.2.4.2 Preferred tolerances on nominal capacitance
See Table 1. Table 1 – Preferred tolerances on nominal capacitance Preferred series Tolerance CN ≥ 10 pF Le≥≥e± co≤e CN < 10 pF Le≥≥e± co≤e E6 ±20 % M ±2 pF G E12 ±10 % K ±1 pF F E24 ±5 % ±2 % ±1 % J G F ±0,5 pF ±0,25 pF ±0,1 pF D C B
IEC 60384-21:2019 © IEC 2019 – 13 –
6.2.5 Temperature coefficient (α) 6.2.5.1 Nominal ≥empe±a≥×±e coefficien≥ an≤ ≥ole±ance Table 2 shows the preferred nominal temperature coefficients and the associated tolerances, expressed in parts per million per Kelvin (10−6/K), and the corresponding subclasses and codes. The detail specification shall specify for each temperature coefficient the minimum value of capacitance for which the given tolerance of temperature coefficient can be verified, considering the accuracy of the methods of capacitance measurement specified. For values of capacitance lower than this minimum value: a) the detail specification shall specify a multiplying factor for the tolerance on α, as well as the permissible changes of capacitance at the lower and upper category temperature;
b) special methods of measurement may be necessary and, if required, shall be stated in the detail specification. Table 2 – Nominal temperature coefficient and tolerance Nominal temperature coefficient(10−6/K) Tolerance on temperature coefficient(10−6/K) Subclass Letter code for α Tolerance +100 0 −33 −75 −150 −220 −330 −470 −750 −1 000 −1 500 ±30 ±30 ±30 ±30 ±30 ±30 ±60 ±60 ±120 ±250 ±250 1B 1B 1B 1B 1B 1B 1B 1B 1B 1F 1F A C H L P R S T U Q V G G G G G G H H J K K +140 ≥ α ≥ −1 000 a 1C SL - NOTE 1 Preferred temperature coefficients values (α) are underlined. NOTE 2 The nominal temperature coefficients and their tolerances are defined using the capacitance change between the temperatures 20 °C and 85 °C. NOTE 3 A capacitor with a temperature coefficient 0 × 10−6/K and a tolerance on temperature coefficient of ±30 × 10−6/K is designated as a CG capacitor (subclass 1B). a This temperature coefficient value is not subject to inspection, since no limits for relative
capacitance variation are specified in Table 3.
NOTE See Annex B for the reference temperature of 25 °C as an informative guidance. 6.2.5.2 Permissible relative variation of capacitance Table 3 shows for each combination of temperature coefficient and tolerance the permissible relative variation of capacitance expressed in parts per thousand at both the upper and lower category temperatures. Temperature coefficients and tolerances are expressed in parts per million per Kelvin (10−6/K). SIST EN IEC 60384-21:2019

– 14 – IEC 60384-21:2019 © IEC 2019 Table 3 – Combination of temperature coefficient and tolerance
Permissible relative variation in capacitance in parts per 1 000 between 20 °C and a given temperature Lower category temperature Upper category temperature α 10−6/K Tolerance 10−6/K
−55 °C
−40 °C
−25 °C
−10 °C
+70 °C
+85 °C
+100 °C
+125 °C +100 ±30 (G) −9,75/
−3,71 −7,80/
−2,96 −5,85/
−2,22 −3,90/
−1,48 3,50/
6,50 4,55/
8,45 5,60/
10,4 7,35/
13,7 0 ±30 (G) −2,25/
5,45 −1,80/
4,36 −1,35/
3,27 −0,90/
2,18 −1,50/
1,5
...