IEC 60384-21:2019

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

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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 (T ) . 12
R
6.2.2 Rated voltage (U ) . 12
R
6.2.3 Category voltage (U ) . 12
C
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

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

– 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

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 (U = U ) . 35
C R
Table 19 – Endurance test conditions (U ≠ U ) . 35
C R
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
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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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
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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
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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;

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.
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
T
R
maximum ambient temperature at which the rated voltage may be continuously applied
3.6
rated voltage
U
R
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
U
C
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.

– 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.

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.

– 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 (T )
R
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 (U )
R
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 (U )
C
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
Tolerance
Preferred
series
C ≥ 10 pF Letter code C < 10 pF Letter code
N N
E6 M G
±20 % ±2 pF
E12 ±10 % K ±1 pF F
E24 J D
±5 % ±0,5 pF
G C
±2 % ±0,25 pF
F B
±1 % ±0,1 pF
6.2.5 Temperature coefficient (α)
6.2.5.1 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 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
Letter code for
Nominal temperature Tolerance on temperature
Subclass
−6 −6
coefficient(10 /K) coefficient(10 /K)
α Tolerance
+100 ±30 1B A G
0 ±30 1B C G
−33 ±30 1B H G
−75 ±30 1B L G
−150 ±30 1B P G
−220 ±30 1B R G
−330 ±60 1B S H
−470 ±60 1B T H
−750 ±120 1B U J
−1 000 ±250 1F Q K
−1 500 ±250 1F V K
a
+140 ≥ α ≥ −1 000 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.
−6
NOTE 3 A capacitor with a temperature coefficient 0 × 10 /K and a tolerance on temperature coefficient of
−6
±30 × 10 /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
−6
million per Kelvin
...