IEC 60384-8:2015

Fixed capacitors for use in electronic equipment - Part 8: Sectional specification: Fixed capacitors of ceramic dielectric, Class 1

IEC 60384-8:2015 is applicable to fixed capacitors of ceramic dielectric with a defined temperature coefficient (dielectric Class 1), intended for use in electronic equipment, including leadless capacitors but excluding fixed surface mount multilayer capacitors of ceramic dielectric. This fourth edition cancels and replaces the third edition published in 2005. This fourth edition is a result of maintenance activities related to the previous edition. All changes that have been agreed upon can be categorized as minor revisions.
The contents of the corrigendum of September 2017 have been included in this copy.

Condensateurs fixes utilisés dans les équipements électroniques - Partie 8: Spécification intermédiaire: Condensateurs fixes à diélectrique en céramique, Classe 1

L'IEC 60384-8:2015 est applicable aux condensateurs fixes en céramique diélectrique avec un coefficient de température défini (diélectrique de classe 1), destinés à être utilisés dans des équipements électroniques, y compris les condensateurs sans plomb et à l'exclusion des condensateurs multicouches montés en surface fixe en céramique diélectrique. Cette quatrième édition annule et remplace la troisième édition publiée en 2005. Cette quatrième édition est le résultat des activités de maintenance relatives à l'édition précédente. Toutes les modifications acceptées peuvent être classées comme des révisions mineures.
Le contenu du corrigendum de septembre 2017 a été pris en considération dans cet exemplaire.

General Information

• Status: Published
• Publication Date: 09-Mar-2015
• ICS: 31.060.20 - Ceramic and mica capacitors
• Technical Committee: TC 40 - Capacitors and resistors for electronic equipment
• Drafting Committee: MT 60384-8 - TC 40/MT 60384-8
• Current Stage: DELPUB - Deleted Publication
• Start Date: 14-Aug-2024
• Completion Date: 31-May-2023

Relations

• Corrected By: IEC 60384-8:2015/COR1:2017 - Corrigendum 1 - Fixed capacitors for use in electronic equipment - Part 8: Sectional specification: Fixed capacitors of ceramic dielectric, Class 1
• Effective Date: 05-Sep-2023
• Revised: IEC 60384-8:2024 - Fixed capacitors for use in electronic equipment - Part 8: Sectional specification - Fixed capacitors of ceramic dielectric, Class 1
• Effective Date: 05-Sep-2023
• Revises: IEC 60384-8:2005 - Fixed capacitors for use in electronic equipment - Part 8: Sectional specification: Fixed capacitors of ceramic dielectric, Class 1
• Effective Date: 05-Sep-2023

Overview

IEC 60384-8:2015 is an international standard issued by the International Electrotechnical Commission (IEC) that specifies requirements for fixed capacitors with ceramic dielectric, classified as Class 1. This standard is tailored for capacitors designed for use in electronic equipment, focusing specifically on those with a defined temperature coefficient (dielectric Class 1). It covers both leaded and leadless fixed capacitors but excludes fixed surface mount multilayer ceramic capacitors. The 2015 fourth edition supersedes the 2005 third edition, incorporating minor revisions and updates including corrections from the 2017 corrigendum.

This standard plays a critical role in ensuring reliable performance, quality, and consistency of Class 1 ceramic fixed capacitors utilized across various electronic applications. It defines parameters including electrical, mechanical, and environmental characteristics, as well as testing methods to verify conformance.

Key Topics

• Scope and Definitions
  Specifies the range of capacitors covered and provides key terminology related to fixed ceramic dielectric capacitors of Class 1.

• Ratings and Characteristics
  Defines preferred ratings such as rated temperature, rated and category voltages, nominal capacitance values, associated tolerances, and temperature coefficients - ensuring consistent performance across products.

• Marking Requirements
  Details marking conventions for capacitors including codes related to temperature coefficients, physical dimensions, and packaging to enable clear identification and traceability.

• Quality Assessment Procedures
  Outlines manufacturing quality stages, including primary manufacturing checks, qualification approval, conformance inspections, and acceptance criteria to maintain high production standards.

• Test and Measurement Procedures
  Prescribes detailed tests including:

  • Capacitance measurement and tolerance verification
  • Tangent of loss angle (dissipation factor)
  • Insulation resistance and voltage proof tests
  • Temperature coefficient and thermal cycling tests
  • Termination robustness and solderability
  • Mechanical stress tests such as vibration, bump and shock resistance
  • Climatic endurance including heat, cold, damp heat, and low pressure exposure

• Environmental and Mechanical Reliability
  Ensures that capacitors can withstand environmental stresses and mechanical shocks relevant to their operational environment.

Applications

IEC 60384-8:2015 is essential for manufacturers, designers, and quality assurance engineers involved with electronic equipment requiring fixed ceramic capacitors with Class 1 dielectric properties. Typical applications include:

• Precision timing circuits and oscillators where stable capacitance and low temperature coefficients are critical.
• High-frequency resonant circuits and filters demanding minimal capacitance variation with temperature changes.
• Instrumentation and measurement devices requiring capacitors with predictable and reliable performance.
• Automotive electronics and industrial equipment where reliability under mechanical and environmental stresses is mandatory.
• Consumer electronics where long-term stability and durability of capacitors are essential.

By adhering to this standard, users can ensure the capacitors meet stringent quality and reliability expectations, reducing the risk of component failure and enhancing overall device performance.

Related Standards

IEC 60384-8:2015 is part of the broader IEC 60384 series dealing with fixed capacitors for electronic equipment. Complementary related standards include:

• IEC 60384-1: General specifications and definitions for fixed capacitors.
• IEC 60384-9: Specifications for fixed capacitors of ceramic dielectric, Class 2.
• IEC 60384-14: Sectional specification for fixed surface mount multilayer ceramic capacitors.
• IEC 60068: Environmental testing standards applicable to capacitors, covering mechanical and climatic tests.
• IEC 60950: Safety requirements for electronic equipment that may incorporate capacitors complying with IEC 60384 series.

Together, these publications form a comprehensive framework guiding the design, manufacturing, testing, and usage of ceramic and other fixed capacitors in electronic systems.

---

Keywords: IEC 60384-8:2015, fixed ceramic capacitors, Class 1 dielectric capacitors, temperature coefficient, capacitor standards, electronic component reliability, capacitor testing, fixed capacitors specifications, electronic equipment capacitors, IEC standards for capacitors.

Standards Content (Sample)

IEC 60384-8 ®
Edition 4.0 2015-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fixed capacitors for use in electronic equipment –
Part 8: Sectional specification: Fixed capacitors of ceramic dielectric, Class 1

Condensateurs fixes utilisés dans les équipements électroniques –
Partie 8: Spécification intermédiaire: Condensateurs fixes à diélectrique en
céramique, Classe 1
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IEC 60384-8 ®
Edition 4.0 2015-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fixed capacitors for use in electronic equipment –

Part 8: Sectional specification: Fixed capacitors of ceramic dielectric, Class 1

Condensateurs fixes utilisés dans les équipements électroniques –

Partie 8: Spécification intermédiaire: Condensateurs fixes à diélectrique en

céramique, Classe 1
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.060.20 ISBN 978-2-8322-2283-6

– 2 – IEC 60384-8:2015 © IEC 2015
CONTENTS
FOREWORD . 6
1 General . 8
1.1 Scope . 8
1.2 Object . 8
1.3 Normative references . 8
1.4 Information to be given in a detail specification . 8
1.4.1 General . 8
1.4.2 Outline drawing and dimensions . 9
1.4.3 Mounting . 9
1.4.4 Ratings and characteristics . 9
1.4.5 Marking . 10
1.5 Terms and definitions . 10
1.6 Marking . 10
1.6.1 General . 10
1.6.2 Marking for code of temperature coefficient . 11
1.6.3 Marking on the body . 11
1.6.4 Marking of the packaging . 11
1.6.5 Additional marking . 11
2 Preferred ratings and characteristics . 11
2.1 Preferred characteristics . 11
2.2 Preferred values of ratings . 11
2.2.1 Rated temperature . 11
2.2.2 Rated voltage (U ) . 12
R
2.2.3 Category voltage (U ) . 12
C
2.2.4 Preferred values of nominal capacitance and associated tolerance
values . 12
2.2.5 Temperature coefficient (α) . 12
3 Quality assessment procedures . 16
3.1 Primary stage of manufacture . 16
3.2 Structurally similar components . 16
3.3 Certified test records of released lots . 16
3.4 Qualification approval . 16
3.4.1 General . 16
3.4.2 Qualification approval on the basis of the fixed sample size procedure . 16
3.4.3 Tests . 17
3.5 Quality conformance inspection . 22
3.5.1 Formation of inspection lots . 22
3.5.2 Test schedule . 23
3.5.3 Delayed delivery . 23
3.5.4 Assessment levels . 23
4 Test and measurement procedures . 24
4.1 General . 24
4.2 Visual examination and check of dimensions . 24
4.3 Electrical tests . 24
4.3.1 Capacitance . 24
4.3.2 Tangent of loss angle (tan δ) . 25

4.3.3 Insulation resistance (R ) . 25
i
4.3.4 Voltage proof . 26
4.4 Temperature coefficient (α) and temperature cyclic drift of capacitance . 27
4.4.1 General . 27
4.4.2 Preliminary drying . 27
4.4.3 Measuring conditions . 27
4.4.4 Requirements . 27
4.5 Robustness of terminations . 27
4.6 Resistance to soldering heat . 27
4.6.1 General . 27
4.6.2 Initial measurement . 27
4.6.3 Test conditions . 27
4.6.4 Final inspection, measurements and requirements. 27
4.7 Solderability . 28
4.7.1 General . 28
4.7.2 Test conditions . 28
4.7.3 Final inspection, measurements and requirements. 28
4.8 Rapid change of temperature (if required) . 28
4.8.1 General . 28
4.8.2 Initial measurement . 28
4.8.3 Test conditions . 28
4.8.4 Recovery . 28
4.9 Vibration . 28
4.9.1 General . 28
4.9.2 Test conditions . 29
4.9.3 Final inspection, measurements and requirements. 29
4.10 Bump (repetitive shock) . 29
4.10.1 General . 29
4.10.2 Initial measurements . 29
4.10.3 Test conditions . 29
4.10.4 Final inspection, measurements and requirements. 29
4.11 Shock (non-repetitive shock) . 29
4.11.1 General . 29
4.11.2 Initial measurements . 30
4.11.3 Test conditions . 30
4.11.4 Final inspection, measurements and requirements. 30
4.12 Climatic sequence. 30
4.12.1 General . 30
4.12.2 Initial measurements . 30
4.12.3 Dry heat . 30
4.12.4 Damp heat, cyclic, Test Db, first cycle . 31
4.12.5 Cold. 31
4.12.6 Low air pressure . 31
4.12.7 Damp heat, cyclic, Test Db, remaining cycles . 31
4.13 Damp heat, steady state . 32
4.13.1 General . 32
4.13.2 Initial measurement . 32
4.13.3 Test conditions . 32
4.13.4 Recovery . 33

– 4 – IEC 60384-8:2015 © IEC 2015
4.13.5 Final inspection, measurements and requirements. 33
4.14 Endurance . 33
4.14.1 General . 33
4.14.2 Initial measurement . 33
4.14.3 Test conditions . 33
4.14.4 Recovery . 34
4.14.5 Final inspection, measurements and requirements. 34
4.15 Component solvent resistance (if required) . 34
4.16 Solvent resistance of the marking (if required) . 34
Annex A (normative) Figures with limits of variation of capacitance with temperature
for certain temperature coefficients and classes. 35
Bibliography . 43

–6
Figure A.1 – α: +100 (10 /K) . 35
–6
Figure A.2 – α: 0 (10 /K) . 36
–6
Figure A.3 – α: –33 (10 /K) . 36
–6
Figure A.4 – α: –75 (10 /K) . 37
–6
Figure A.5 – α: –150 (10 /K) . 37
–6
Figure A.6 – α: –220 (10 /K) . 38
–6
Figure A.7 – α: –330 (10 /K) . 38
–6
Figure A.8 – α: –470 (10 /K) . 39
–6
Figure A.9 – α: –750 (10 /K) . 39
–6
Figure A.10 – α: –1 000 (10 /K) . 40
–6
Figure A.11 – α: –1 500 (10 /K) . 40
–6
Figure A.12 – α: –2 200 (10 /K) . 41
–6
Figure A.13 – α: –3 300 (10 /K) . 41
–6
Figure A.14 – α: –4 700 (10 /K) . 42
–6
Figure A.15 – α: –5 600 (10 /K) . 42

Table 1 – Preferred tolerances on nominal capacitance . 12
Table 2 – Nominal temperature coefficient and tolerances . 13
Table 3 – Combination of temperature coefficient and tolerance . 14
Table 4 – Sampling plan together with numbers of permissible non-conforming items
for qualification approval tests, assessment level EZ . 18
Table 5 – Test schedule for qualification approval. 19
Table 6 – Lot-by-lot inspection . 23
Table 7 – Periodic tests . 24
Table 8 – Tangent of loss angle . 25
Table 9 – Insulation resistance requirements . 26
Table 10 – Test voltages for single layer ceramic capacitors . 26
Table 11 – Test voltages for leaded multilayer ceramic capacitors . 26
Table 12 – Temperature cyclic drift limits . 27
Table 13 – Requirements . 28
Table 14 – Preferred severities (of non-repetitive shock) . 30

Table 15 – Maximum capacitance change . 30
Table 16 – Number of damp heat cycles . 31
Table 17 – Final inspection, measurements and requirements . 32
Table 18 – Test conditions for damp heat, steady state . 32
Table 19 – Final inspection, measurements and requirements . 33
Table 20 – Endurance test conditions . 34
Table 21 – Final inspection, measurements and requirements . 34

– 6 – IEC 60384-8:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIXED CAPACITORS FOR USE IN ELECTRONIC EQUIPMENT –

Part 8: Sectional specification:
Fixed 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
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60384-8 has been prepared by IEC technical committee 40:
Capacitors and resistors for electronic equipment.
This fourth edition cancels and replaces the third edition published in 2005. This fourth edition
is a result of maintenance activities related to the previous edition. All changes that have
been agreed upon can be categorized as minor revisions.
The text of this standard is based on the following documents:
FDIS Report on voting
40/2338/FDIS 40/2363/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

This publication 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 publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
The contents of the corrigendum of September 2017 have been included in this copy.

– 8 – IEC 60384-8:2015 © IEC 2015
FIXED CAPACITORS FOR USE IN ELECTRONIC EQUIPMENT –

Part 8: Sectional specification:
Fixed capacitors of ceramic dielectric, Class 1

1 General
1.1 Scope
This part of IEC 60384 is applicable to fixed capacitors of ceramic dielectric with a defined
temperature coefficient (dielectric Class 1), intended for use in electronic equipment, including
leadless capacitors but excluding fixed surface mount multilayer capacitors of ceramic
dielectric, which are covered by IEC 60384-21 (Class 1).
Capacitors for electromagnetic interference suppression are not included, but are covered by
IEC 60384-14.
1.2 Object
The object of this standard is to prescribe preferred ratings and characteristics and to select
from IEC 60384-1:2008, 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 shall be of equal or higher performance level because lower performance levels
are not permitted.
1.3 Normative references
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.
IEC 60063:1963, Preferred number series for resistors and capacitors
IEC 60063:1963/AMD1:1967
IEC 60063:1963/AMD2:1977
IEC 60068-1:2013, Environmental testing – Part 1: General and guidance
IEC 60384-1:2008, Fixed capacitors for use in electronic equipment – Part 1: Generic
specification
IEC 61193-2:2007, Quality assessment systems – Part 2: Selection and use of sampling plans
for inspection of electronic components and packages
ISO 3:1973, Preferred numbers – Series of preferred numbers
1.4 Information to be given in a detail specification
1.4.1 General
Detail specifications shall be derived from the relevant blank detail specification.
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 1.4.2 may for convenience, be presented in tabular form.
The following information shall be given in each detail specification and the values quoted
shall preferably be selected from those given in the appropriate clause of this sectional
specification.
1.4.2 Outline drawing and dimensions
There shall be an illustration of the capacitor as an aid to easy recognition and for comparison
of the capacitor with others.
Dimensions and their associated tolerances, which affect interchangeability and mounting,
shall be given in the detail specification. All dimensions shall preferably 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 of the body, the width and height
of the body and the wire spacing, or for cylindrical types, the body diameter, and the length
and diameter of the terminations. When necessary, for example when a number of items
(capacitance values/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. When the capacitor is not
designed for use on printed boards, this shall be clearly stated in the detail specification.
1.4.3 Mounting
The detail specification shall specify the method of mounting to be applied for normal use and
for the application of the vibration and the bump or shock tests. The design of the capacitor
may be such that special mounting fixtures are required in its use. In this case, the detail
specification shall describe the mounting fixtures and they shall be used in the application of
the vibration and the bump or shock tests.
1.4.4 Ratings and characteristics
1.4.4.1 General
The ratings and characteristics shall be in accordance with the relevant clauses of this
standard, together with the following:
1.4.4.2 Nominal capacitance range
See 2.2.4.1.
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”.
1.4.4.3 Particular characteristics
Additional characteristics may be listed, when they are considered necessary to specify
adequately the component for design and application purposes.

– 10 – IEC 60384-8:2015 © IEC 2015
1.4.4.4 Soldering
The detail specification shall prescribe the test methods, severities and requirements
applicable for the solderability and the resistance to soldering heat tests.
1.4.5 Marking
The detail specification shall specify the content of the marking on the capacitor and on the
packaging. Deviations from 1.6 shall be specifically stated.
1.5 Terms and definitions
For the purposes of this document, the applicable terms and definitions of IEC 60384-1 as
well as the following apply.
1.5.1
fixed capacitors, 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).
1.5.2
subclass
for a given nominal temperature coefficient; it is defined by the tolerance on the temperature
coefficient (see Table 2)
Note 1 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 deviations (∆C/C) for other temperatures (see Table 3). The same information is expressed in
graphical form in Figures A.1 to A.15.
These figures enable the user to form an estimate of the value and tolerance of 1/C × (dC/dT) , the incremental
T
temperature coefficient at a given temperature T, though this quantity is not required specifically to be measured in
the test.
1.5.3
rated voltage
U
R
maximum d.c. voltage which may be applied continuously to the terminations of a capacitor at
the rated temperature
Note 1 to entry: Maximum d.c. voltage is the sum of the d.c. voltage and peak a.c. voltage or peak pulse voltage
applied to the capacitor.
[SOURCE: IEC 60384-1:2008, 2.2.25, modified (addition of "the terminations of")]
1.6 Marking
1.6.1 General
See IEC 60384-1:2008, 2.4, with the following details.
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:
a) nominal capacitance;
b) rated voltage (d.c. voltage may be indicated by the symbol      or       );
c) tolerance on nominal capacitance;
d) temperature coefficient and, space permitting, its tolerance in code, see Table 2;

e) year and month (or week) of manufacture;
f) manufacturer's name or trade mark;
g) climatic category;
h) manufacturer's type designation;
i) reference to the detail specification.
Information required under b) and d) may be given in code form under manufacturer's, or
national, type or style designation.
1.6.2 Marking for code of temperature coefficient
Coding of temperature coefficient is given in Table 2. In case of colour code spot, stripe or
ring may be used; moreover for temperature coefficients, where two colours are required, the
second colour may be provided by the colour of the body or of the typographical marking.
1.6.3 Marking on the body
The capacitor shall be clearly marked with a), b) and c) of 1.6.1 and with as many as possible
of the remaining items as is considered necessary. Any duplication of information in the
marking on the capacitor should be avoided.
1.6.4 Marking of the packaging
The packaging containing the capacitor(s) shall be clearly marked with all the information
listed in 1.6.1.
1.6.5 Additional marking
Any additional marking shall be so applied that no confusion can arise.
2 Preferred ratings and characteristics
2.1 Preferred characteristics
Preferred climatic categories only shall be given in the preferred characteristics.
The capacitors covered by this standard are classified into climatic categories according to
the general rules given in IEC 60068-1:2013, Annex A.
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 and -10 °C
− upper category temperature: +70 °C, +85 °C, +100 °C and +125 °C
4, 10, 21 and 56 days
− duration of the damp heat, steady state test (40 °C, 93% RH):
The severities for the cold and dry heat tests are the lower and upper category temperatures
respectively.
2.2 Preferred values of ratings
2.2.1 Rated temperature
For capacitors covered by this standard, the rated temperature is equal to the upper category
temperature.
– 12 – IEC 60384-8:2015 © IEC 2015
2.2.2 Rated voltage (U )
R
The preferred values of rated voltage are: 25, 40, 63, 100, 160, 250, 400, 630, 1 000, 1 600,
2 500, 4 000 and 6 300 V. These values conform to the basic series of preferred values R5
given in ISO 3. If other values are needed they shall be chosen from the R10 series.
The sum of the d.c. voltage and the peak a.c. voltage applied to the capacitor should not
exceed the rated voltage. The value of the peak alternating voltage should not exceed the
value determined by the permissible reactive power.
2.2.3 Category voltage (U )
C
Since the rated temperature is defined as the upper category temperature, the category
voltage is equal to the rated voltage, as defined in IEC 60384-1:2008, 2.2.5.
2.2.4 Preferred values of nominal capacitance and associated tolerance values
2.2.4.1 Preferred values of rated capacitance
Nominal capacitance values shall be taken from the E6, E12 and E24 series given in
IEC 60063 preferably.
2.2.4.2 Preferred tolerances on nominal capacitance
Table 1 denotes the preferred values of tolerance on nominal capacitance.
Table 1 – Preferred tolerances on nominal capacitance

C ≥ 10 pF C < 10 pF
N N
Preferred series Tolerances Letter code Tolerances Letter code
E 6 M G
±20 % ±2 pF
E 12 ±10 % K ±1 pF F
J D
±5 % ±0,5 pF
E 24 G C
±2 % ±0,25 pF
F B
±1 % ±0,1 pF
2.2.5 Temperature coefficient (α)
2.2.5.1 Nominal temperature coefficient and tolerance
Table 2 shows the preferred nominal temperature coefficients and the associated tolerances,
-6
expressed in parts per million per Kelvin (10 /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 may be verified,
considering the accuracy of the methods of capacitance measurement specified.
For values of capacitance lower than these minimum values:
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.
2.2.5.2 Limits of variation of capacitance
Figures A.1 to A.15 show the limits of variation of capacitance with temperature for the
temperature coefficients and subclasses listed in Table 3.
Table 2 – Nominal temperature coefficient and tolerances
Nominal Tolerance on Subclass Letter code Colour code for
temperature temperature temperature
α Tolerance
coefficient coefficient
coefficient (α)
–6
–6
10 /K
10 /K
1A A F
+100 ±15 Red + Violet
1B G
±30
1A F Black
±15
0 1B C G
±30
1F H
±60
–33 ±15 1A H F Brown
1B G
±30
–75 1A L F Red
±15
1B G
±30
–150 ±15 1A P F Orange
1B G
±30
1F H
±60
–220 1A R F Yellow
±15
1B G
±30
1F H
±60
–330 1A S G Green
±30
1B H
±60
–470 ±30 1A T G Blue
1B H
±60
–750 1A U H Violet
±60
1B J
±120
1F K
±250
–1 000 1A Q H
±60 Red + Yellow
1B J
±120
1F K
±250
–1 500 1F V K
±250 Orange + Orange
–2 200 1F K L
±500 Yellow + Orange
–3 300 ±500 1F D L Green + Orange
–4 700 1F E M
±1 000 Blue + Orange
–5 600 1F F M
±1 000 Black + Orange
a
+140≥α≥–1 000 1C SL - Grey
a
1D UM - White
+250≥α ≥–1 750
NOTE 1 Preferred temperature coefficient values (α) are underlined.
-6 –6
NOTE 2 α values +33 × 10 /K and -47 × 10 /K are also obtained on request.
NOTE 3 The nominal temperature coefficients and their tolerances are defined using the capacitance change
between the temperatures 20 °C and 85 °C.
–6
NOTE 4 A capacitor with a temperature coefficient of 0 × 10 /K and a tolerance on temperature coefficient of
–6
±30 × 10 /K is designed as a CG capacitor (subclass 1B).
a
Those temperature coefficient values are not subject to inspection, since no limits for relative capacitance
variation are specified in Table 3.

– 14 – IEC 60384-8:2015 © IEC 2015

Table 3 – Combination of temperature coefficient and tolerance
Temperature coefficients Permissible relative variation in capacitance in parts per 1 000 between 20 °C and a given temperature
Lower category temperatures Upper category temperatures
a
α Tol.
–55 °C –40 °C –25 °C –10 °C +70 °C +85 °C +100 °C +125 °C
–6 –6
10 /K 10 /K
–8,63/–5,08 –6,90/–4,06 –5,18/–3,05 –3,45/–2,03
±15  (F) 4,25/5,75 5,53/7,48 6,80/9,20 8,93/12,1
+100
–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
±30  (G)
±15  (F)
–1,13/4,07 –0,900/3,26 –0,675/2,44 –0,450/1,63 –0,750/0,750 –0,975/0,975 –1,20/1,20 –1,58/1,58
0 ±30  (G) –2,25/5,45 –1,80/4,36 –1,35/3,27 –0,900/2,18 –1,50/1,50 –1,95/1,95 –2,40/2,40 –3,15/3,15
–4,50/8,19 –3,60/6,55 –2,70/4,91 –1,80/3,28 –3,00/3,00 –3,90/3,90 –4,80/4,80 –6,30/6,30
±60  (H)
±15  (F) 1,35/7,09 1,08/5.67 0,810/4,26 0,540/2,84 –2,40/–0,900 –3,12/–1,17 –3,84/–1,44 –5,04/–1,89
–33
±30  (G) 0,225/8,46 0,180/6,77 0,135/5,08 0,090/3,39 –3,15/–0,150 –4,10/–0,195 –5,04/0,240 –6,62/–0,315
±15  (F) 4,50/10,9 3,60/8,75 2,70/6,56 1,80/4,37 –4,50/–3,00 –5,85/–3,90 –7,20/–4,80 –9,45/–6,30
–75
3,38/12,3 2,70/9,85 2,03/7,38 1,35/4,92 –5,25/–2,25 –6,83/–2,93 –8,40/–3,60 –11,0/–4,73
±30  (G)
±15  (F)
10,1/17,8 8,10/14,2 6,08/1
...