IEC 62391-2:2006

IEC 62391-2 ®
Edition 1.0 2006-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fixed electric double-layer capacitors for use in electronic equipment –
Part 2: Sectional specification – Electric double layer capacitors for power
application
Condensateurs électriques fixes à double couche utilisés dans les équipements
électroniques –
Partie 2: Spécification intermédiaire – Condensateurs électriques à double
couche pour application de puissance

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IEC 62391-2 ®
Edition 1.0 2006-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fixed electric double-layer capacitors for use in electronic equipment –
Part 2: Sectional specification – Electric double layer capacitors for power
application
Condensateurs électriques fixes à double couche utilisés dans les équipements
électroniques –
Partie 2: Spécification intermédiaire – Condensateurs électriques à double
couche pour application de puissance

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
T
CODE PRIX
ICS 31.060.10 ISBN 978-2-88912-733-7
– 2 – 62391-2  IEC:2006
CONTENTS
FOREWORD . 3
1 General . 5
1.1 Scope . 5
1.2 Object . 5
1.3 Normative references . 5
1.4 Information to be given in a detail specification . 6
1.5 Terminology . 7
1.6 Marking . 7
2 Preferred rating and characteristics . 8
2.1 Preferred characteristics . 8
2.2 Preferred values of ratings . 8
3 Quality assessment procedures . 9
3.1 Primary stage of manufacture . 9
3.2 Structurally similar components . 9
3.3 Declaration of conformity (basic requirements) . 9
3.4 Test schedule and requirement for initial assessment (mandatory and
optional tests) . 9
3.5 Quality conformance inspection . 14
4 Test and measurement procedures . 16
4.1 Preliminary drying . 16
4.2 Measuring conditions . 16
4.3 Visual examination and check of dimensions . 16
4.4 Electrical tests . 16
4.5 Robustness of terminations . 17
4.6 Resistance to soldering heat . 17
4.7 Solderability . 18
4.8 Rapid change of temperature . 18
4.9 Vibration. 18
4.10 Endurance . 19
4.11 Self-discharge . 19
4.12 Storage at high temperature . 20
4.13 Characteristics at high and low temperature . 20
4.14 Damp heat, steady state . 20
4.15 Passive flammability (if applicable) . 20
4.16 Pressure relief (if applicable) . 21
Annex A (informative) Calculation procedure for power density . 22

Figure A.1 – Voltage characteristics between capacitor terminals . 23

Table 1 – Fixed sample size test plan for qualification approval . 11
Table 2 – Tests schedule for qualification approval . 12
Table 3a – Lot-by-lot inspection . 15
Table 3b – Periodic test . 15

62391-2  IEC:2006 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIXED ELECTRIC DOUBLE-LAYER CAPACITORS
FOR USE IN ELECTRONIC EQUIPMENT –

Part 2: Sectional specification –
Electric double layer capacitors for power application

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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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 62391-2 has been prepared by IEC technical committee 40:
Capacitors and resistors for electronic equipment.
This bilingual version corresponds to the monolingual English version, published in 2006-04.
The text of this standard is based on the following documents:
FDIS Report on voting
40/1641/FDIS 40/1713/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.
The French version of this standard has not been voted upon.

– 4 – 62391-2  IEC:2006
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 62391 consists of the following parts, under the general title Fixed electric double-layer
capacitors for use in electronic equipment:
Part 1: Generic specification
Part 2: Sectional specification – Electric double-layer capacitors for power application
The sectional specification mentioned above does have a blank detail specification being a
supplementary document, containing requirements for style, layout and minimum content of
detail specifications.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
62391-2  IEC:2006 – 5 –
FIXED ELECTRIC DOUBLE-LAYER CAPACITORS
FOR USE IN ELECTRONIC EQUIPMENT –

Part 2: Sectional specification –
Electric double-layer capacitors for power application

1 General
1.1 Scope
This part of IEC 62391 applies to electric double-layer capacitors for power application.
Electric double-layer capacitors for power are intended for applications that require discharge
currents in the range from mA to A. The characteristics of the capacitors include such
performance as relatively high capacitance and low internal resistance, which is applicable to
Class 3 of the measurement classification specified in IEC 62391-1.
The definition of power density and its calculating procedure should be in accordance with
Annex A.
1.2 Object
The object of this standard is to prescribe preferred ratings and characteristics and to select
from IEC 62391-1 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 shall be of equal or higher performance level; lower performance levels are not
permitted.
1.3 Normative references
The following referenced documents are indispensable for the application 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, Environmental testing – Part 1: General and guidance
IEC 60384-1, Fixed capacitors for use in electronic equipment – Part 1: Generic specification
IEC 60410, Sampling plans and procedures for inspection by attributes
IEC 62391-1, Fixed electric double-layer capacitors for use in electronic equipment – Part 1:
Generic specification
IEC 62391-2-1, Fixed electric double-layer capacitors for use in electronic equipment –
Part 2-1: Electric double-layer capacitors for power application – Assessment level EZ
ISO 3, Preferred numbers – Series of preferred numbers

– 6 – 62391-2  IEC:2006
1.4 Information to be given in a detail specification
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.
NOTE The information given in 1.4.1 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.
1.4.1 Outline drawing and dimensions
There shall be an illustration of the surface mount capacitors as an aid to easy recognition
and for comparison of the surface mount capacitors 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, numerical values shall be given for the length of the body, the width and height of
the body and wire spacing, or, for cylindrical types, the body diameter and length, and the
length and diameter of the terminations. When necessary, for example, when a number of
case sizes 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 capacitor. When the capacitor is not
designed for use on printed boards, this shall be clearly stated in the detail specification.
1.4.2 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 test. The capacitors shall be
mounted by their normal means. The design of the capacitor may be such that special
mounting fixtures are required for 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 bump or
shock tests.
1.4.3 Rating and characteristics
The ratings and characteristics shall be in accordance with the relevant clauses of this
specification, together with the following.
1.4.3.1 Rated capacitance range
See 2.2.1.
NOTE 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 IEC QC 001005.”

62391-2  IEC:2006 – 7 –
1.4.3.2 Particular characteristics
Additional characteristics may be listed, when they are considered necessary to specify
adequately the component for design and application purposes.
1.4.3.3 Soldering
The detail specification shall prescribe the test methods, severities and requirements
applicable to the solderability and the resistance to soldering heat tests.
1.4.4 Marking
The detail specification shall specify the content of the marking on the capacitor and on the
package. Deviations from 1.6 of this sectional specification shall be specifically stated.
1.5 Terminology
For the purposes of this document, the terms and definitions of IEC 62391-1, together with the
following, apply.
1.5.1
surface mount capacitor
capacitor whose small dimensions and nature or shape of terminations make it suitable for
surface mounting
1.5.2
electric double layer capacitors for power application
capacitors intended for the applications that require discharge currents in the range from mA
to A
NOTE The characteristics of the capacitors include such performance as relatively high capacitance and low
internal resistance, which is applicable to Class 3 of the measurement classification specified in IEC 62391-1.
1.6 Marking
IEC 62391-1, 2.4, applies with the following details.
1.6.1 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) polarity of the terminations (unless identified by the construction);
b) rated capacitance;
c) rated voltage (d.c. voltage may be indicated by the symbol      or     );
d) style (in accordance with 1.1);
e) year and month (or week) of manufacture;
f) manufacturer’s name or trade mark;
g) manufacturer’s type designation;
h) classification of processing lead terminals (if applicable).
1.6.2 Capacitors shall bear a), b) and c) in 1.6.1, and as many of the rest of the items as
possible which should be as legible as possible. Indication of marked items on a capacitor
shall not overlap.
1.6.3 Any marking shall be legible and not easily smeared or removed by rubbing with the
finger.
– 8 – 62391-2  IEC:2006
1.6.4 The package containing the capacitor(s) shall be clearly marked with all the
information listed in 1.6.1, except polarity, unless this is applicable to the method of
packaging.
1.6.5 Any additional marking shall be so applied that no confusion can arise.
2 Preferred rating and characteristics
2.1 Preferred characteristics
The values given in the detail specification shall preferably be selected from the following:
2.1.1 Preferred climatic categories
The surface mount capacitors covered by this specification are classified into climatic
categories according to the general rules given in IEC 60068-1.
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: −25 °C (−40 °C)
Upper category temperature: +60 °C and +70 °C
Duration of the damp-heat, steady-state test: 10 days
The severities for the cold and dry heat tests are the lower and upper category temperatures
respectively.
NOTE The damp-heat steady-state test conditions here should be at a temperature of 40 °C, and the relative
humidity should be between 90 % and 95 %.
2.2 Preferred values of ratings
2.2.1 Rated capacitance (C )
R
The rated capacitance shall be expressed in farads (F) and as agreed between the sending
and receiving parties. Preferred values of rated capacitance are the values from the E24
series of IEC 60063 and their decimal multiples.
2.2.2 Tolerance on rated capacitance
The preferred values of tolerance on rated capacitance are:
±20 % and −20 %/+80 %.
2.2.3 Rated voltage (U )
R
The rated voltage shall be as agreed between the sending and receiving parties. The
preferred values of the rated direct voltages are taken from the R20 series of ISO 3 and their
decimal multiples.
2.2.4 Rated temperature
The value of the rated temperature is 60 °C or 70 °C.

62391-2  IEC:2006 – 9 –
2.2.5 Internal resistance
The internal resistance shall be as agreed between the sending and receiving parties. The
internal resistance shall be measured with the d.c. resistance method. However, if a
coefficient can be obtained from both d.c. and a.c. resistance methods, the a.c. resistance
method may be used for measurement.
3 Quality assessment procedures
3.1 Primary stage of manufacture
The primary stage of manufacture is the inspection process for activated carbon electrodes,
provided that the activated carbon electrodes include the condition where the collector has
been bonded in advance.
3.2 Structurally similar components
Capacitors considered as being structurally similar are capacitors produced with similar
processes and materials, though they may be of different case sizes and values.
3.3 Declaration of conformity (basic requirements)
3.4 Test schedule and requirement for initial assessment (mandatory and optional tests)
The procedures for qualification approval testing are given in IEC 60384-1, 3.5.
The schedule to be used for qualification approval testing on the basis of lot-by-lot and
periodic tests is given in 3.5 of this specification. The procedure using a fixed sample size
schedule is given in 3.4.1 and 3.4.2.
3.4.1 Qualification approval on the basis of the fixed sample size procedures
The fixed sample size procedure is described in IEC 60384-1, 3.5.3b). The sample shall be
representative of the range of capacitors for which approval is sought. This may or may not be
the complete range covered by the detail specification.
For each temperature characteristic, the sample shall consist of specimens of capacitors of
maximum and minimum size and, for each of these sizes, the maximum capacitance value for
the highest rated voltage and the minimum rated voltage of the voltage ranges for which
approval is sought. When there are more than four rated voltages, an intermediate voltage

shall also be tested.
The numbers given in Group 0 assume that all groups are applicable. If this is not so, the
numbers may be reduced accordingly.
When additional groups are introduced into the qualification approval test schedule, the
number of specimens required for Group 0 shall be increased by the same number as that
required for the additional groups.
Table 1 gives the number of samples to be tested in each group or subgroup together with the
number of permissible non-conformances for the qualification approval test.

– 10 – 62391-2  IEC:2006
3.4.2 Tests
The complete series of tests specified in Tables 1 and 2 is required for the approval of
capacitors covered by one detail specification. The tests of each group shall be carried out in
the order given.
The whole sample shall be subjected to the tests of Group 0 and then divided for the other
groups.
Non-conforming specimens (Table 1) found during the tests of Group 0 shall not be used for
the other groups.
“One non-conforming item” is counted when a capacitor has not satisfied the whole or a part
of the tests of a group.
Approval is granted when the number of nonconforming items does not exceed the specified
number of permissible non-conforming items for each group or subgroup and the total number
of permissible non-conforming items.
NOTE Tables 1 and 2 together form the fixed sample size test schedule. Table 1 includes the details for the
sampling and permissible non-conforming items for the different tests or groups of tests. Table 2, together with the
details of the test contained in Clause 4, gives a complete summary of test conditions and performance
requirements and indicates where, for example for the test method or conditions of test, a choice has to be made in
the detail specification.
The conditions of test and performance requirements for the fixed sample size test schedule should be identical to
those prescribed in the detail specification for quality conformance inspection.

62391-2  IEC:2006 – 11 –
Table 1 – Fixed sample size test plan for qualification approval
Assessment level EZ
Group Test Subclause Number of Permissible
of this specimens number of
No.
publication non-conforming
items
a
n
c
b c)
Visual examination 4.3 56
0 0
Dimensions 4.3
Leakage current 4.4.1
Capacitance 4.4.2
Internal resistance 4.4.3
Spare specimens 2
1A Robustness of terminations 4.5 8 0
Resistance to soldering heat 4.6
1B Solderability 4.7 8 0
Rapid change of temperature 4.8
Vibration  4.9
2 Endurance  4.10 16 0
3A Self-discharge 4.11 8 0
Storage at high temperature 4.12
3B Damp heat, steady state 4.14 8 0
4 Characteristics at high and low temperature 4.13 8 0
4A Passive flammability (if applicable) 4.15 4 0
4B Pressure relief (if applicable) 4.16 4 0
a
For case size/voltage combinations, see 3.4.1.
b
The values of these measurements serve as initial measurements for the tests of Subgroup 0.
c
Specimens found to be nonconforming shall not be taken into account when calculating the permissible
non-conforming items for the following tests. They shall be replaced by spare parts.

– 12 – 62391-2  IEC:2006
Table 2 – Tests schedule for qualification approval
a a b
Subclause number and test D Conditions of test n and c Performance
a
or requirements
ND
b
Group 0 ND See
Table 1
4.3 Visual examination As in 4.3.2

Legible marking and as
specified in the detail
specification
4.4 Dimension (detail) See the detail specification

4.4.1 Leakage current Protective resistor: …. Ω As in 4.4.1.2
4.4.2 Capacitance Per Class 3 As in 4.4.2.2
d)
4.4.3 Internal resistance D.C. resistance : per Class 3 As in 4.4.3.2
Group 1A
D See
Table 1
4.5 Robustness of Test method:
terminations
Test U (Tensile strength)
a1
Test U (Bending strength)
b
4.5.1 Initial measurement Capacitance
4.5.2 Final measurement Visual examination No visible damage
Legible marking
Capacitance
∆C/C ≤ 10 % of value
measured in 4.5.1
4.6 Resistance to soldering Method 1a of Test Tb

c
heat
Recovery: …
4.6.1 Initial measurement Capacitance
4.6.3 Final measurement Visual examination No visible damage
Legible marking and no
leakage of electrolyte
Capacitance ∆C/C ≤ 10 % of value
measured in 4.6.1
Group 1B D See
Table 1
c
4.7 Solderability Test method: Solder bath
method (Method 1)
4.7.1 Final measurement Visual examination 75 % or more of terminals
shall be covered with new
solder
4.8 Rapid change of T : Lower category temperature
A
temperature T : Upper category temperature
B
5 cycles
Test time t : ….
4.8.1 Initial measurement Visual examination capacitance
4.8.3 Final inspection Visual examination capacitance No visible damage and no
leakage of electrolyte
∆C/C ≤ 10 % of value
measured in 4.8.1 for
capacitance
4.9 Vibration Mounting method: see 1.4.2
4.9.1 Initial measurement Capacitance (the value obtained
in 4.8.3 may be used)
4.9.3 Final inspection Visual examination No visible damage
Legible marking and no
leakage of electrolyte
Capacitance ∆C/C ≤ 10 % of value
measured in 4.9.1
62391-2  IEC:2006 – 13 –
a a b
Subclause number and test D Conditions of test n and c Performance
a
or requirements
ND
b
Group 2 D See
Table 1
4.10 Endurance Duration:
1 000 h for upper category
temperature 70 °C grade
capacitors
2 000 h for upper category
temperature 60 °C grade
capacitors
Voltage: … V
Recovery: 16 h min
4.10.1 Initial measurement Capacitance
4.10.3 Final measurements Visual examination No visible damage and no
leakage of electrolyte
Capacitance ∆C/C ≤ 30 % of value
measured in 4.10.1
Internal resistance ≤ 4 times the limit specified in
4.4.3
Group 3A D See
Table 1
4.11 Self-discharge Discharge time: ….

Charge voltage: ….
Charge time: 8 h
Measurement time: ….
4.11.2 Final measurements Retention voltage Retention voltage after a 24 h
exposure at room temperature
after charge shall be 80 % or
more of the charge voltage
4.12 Storage at high Test temperature:
temperature upper category temperature
Duration: 96 h ± 4 h
Recovery: 16 h min.
4.12.1 Initial measurement Capacitance
4.12.3 Final measurements Visual examination No visible damage and no
leakage of electrolyte
Capacitance
∆C/C ≤ 10 % of value
measured in 4.12.1
Internal resistance
≤ 2 times the limit specified in
4.4.3
Group 3B D See
Table 1
4.14 Damp heat, steady
Temperature, humidity: 40 °C,
state
90 % to 95 %
Time: 10 days
4.14.1 Initial measurement Capacitance
4.14.3 Final measurements
Visual examination No visible damage and no

leakage of electrolyte
Capacitance ∆C/C ≤ 30 % of value

measured in 4.14.1
Internal resistance
≤ 4 times the limit specified in
4.4.3
– 14 – 62391-2  IEC:2006
a a b
Subclause number and test D Conditions of test n and c Performance
a
or requirements
ND
b
Group 4 D See
Table 1
4.13 Characteristics at high The capacitors shall be
and low temperature measured at each temperature

step
For use as reference value
Step 1: 20 °C
Capacitance
Step 2: lower category
temperature
Capacitance
∆C/C ≤ 30 % of value
measured in Step 1
Internal resistance
≤ 4 times the limit specified in
4.4.3.2
Step 3: upper category
temperature
Capacitance  ∆C/C ≤ 30 % of value
measured in Step 1
Internal resistance
≤ the limit specified in 4.4.3.2
Group 4A D See Table 1
4.15 Passive flammability  Category of flammability: …. As in 4.15.1
(if applicable)
Group 4B D See Table 1
Applied voltage: …. As in 4.16.1
4.16 Pressure relief
(if applicable)
a
Subclause numbers of test and performance requirements refer to Clause 4 of this specification.
b
In this table: D = destructive;
ND = non-destructive;
n = sample size;
c = acceptance criterion (permitted number of nonconforming items).
c
Not applicable to capacitors with screw terminations or other terminations not designed to be soldered, as stated in
the detail specification.
d
The a.c. resistance method shall be used when a correlation is found with the results of the d.c. measuring method.
The measuring method shall be in accordance with 4.6.1 (a.c. resistance method) of IEC 62391-1.

3.5 Quality conformance inspection
3.5.1 Formation of inspection lots
3.5.1.1 Group A and B inspection
These tests shall be carried out on a lot-by-lot basis.
A manufacturer may aggregate the current production into inspection lots subject to the
following safeguards.
a) The inspection lot shall consist of structurally similar capacitors (see 3.2).
b) The sample tested shall be representative of the values and the dimensions contained in
the inspection lot:
– in relation to their number;
– with a minimum of five of any one value.

62391-2  IEC:2006 – 15 –
3.5.1.2 Group C inspection
These tests shall be carried out on a periodic basis.
Samples shall be representative of the current production of the specified periods and shall
be divided into small, medium and large sizes. In order to cover the range of approvals in any
period, one voltage shall be tested from each group of sizes. In subsequent periods, other
sizes and/or voltage ratings in production shall be tested with the aim of covering the whole
range.
3.5.2 The schedule
The schedule for the lot-by-lot and periodic tests for quality conformance inspection is given
in Table 4 of the blank detail specification, IEC 62391-2-1.
3.5.3 Assessment levels
The assessment level(s) given in the blank detail specification shall preferably be selected
from Tables 3a and 3b.
Table 3a – Lot-by-lot inspection
Inspection  EZ
d
a a a
Subgroup
IL n c
b
A0   100 %
c
A1
S-3 0
c
A2
S-3 0
c
B1, B2
S-3 0
a
IL is the inspection level;
n is the sample size;
c is the permissible number of nonconforming items.
b
100 % testing shall be followed by re-inspection by sampling in order to monitor the outgoing quality level by
non-conforming items per million (ppm). The sampling level shall be established by the manufacturer. For the
calculation of ppm values, any parametric failure shall be counted as a non-conforming item. If one or more
non-conforming items occur in a sample, this lot shall be rejected.
c
Number to be tested: sample size as directly allotted to the code letter for IL in Table IIA of IEC 60410 (single
sampling plan for normal inspection).
d
The content of the inspection subgroup is described in Clause 2 of the relevant blank detail specification.

Table 3b – Periodic test
Inspection  EZ
b
a a a
subgroup     p n c
C1A  12 8 0
C1B 12 8 0
C2 6 16 0
C3A 6 8
C3B
6 8 0
C4 12 8 0
a
p is the periodicity in months;
n is the sample size;
c is the permissible number of non-conforming items.
b
The content of the inspection subgroup is described in Clause 2 of the relevant blank detail specification.

– 16 – 62391-2  IEC:2006
4 Test and measurement procedures
This section supplements the information given in IEC 62391-1, Clause 4.
4.1 Preliminary drying
If prescribed in the detail specification, the conditions as given in IEC 62391-1, 4.3.
4.2 Measuring conditions
See IEC 62391-1, 4.2.1.
4.3 Visual examination and check of dimensions
See IEC 62391-1, 4.4, with the following details.
4.3.1 Visual examination
Visual examination shall be carried out with suitable equipment with approximately 10×
magnification and lighting appropriate to the specimen under test and the quality level
required.
NOTE The operator should have facilities available for incident or transmitted illumination as well as an
appropriate measuring facility.
4.3.2 Requirements
The capacitors shall be examined to verify that the materials, design, construction, physical
dimensions and workmanship are in accordance with the applicable requirements given in the
detail specification.
4.4 Electrical tests
4.4.1 Leakage current
See IEC 62391-1, 4.7 with the following details:
4.4.1.1 Measuring conditions
The rated voltage shall be applied across the capacitor and its protective resistor.
The protective resistor shall have a value of 1 000 Ω or less.
Unless otherwise agreed upon between the trading partners, the discharge time before test
shall be 12 h or longer.
Unless otherwise agreed upon between the trading partners, the electrification time shall be
24 h.
4.4.1.2 Requirements
The leakage current (at 20 °C) shall meet the requirements of the detail specification.

62391-2  IEC:2006 – 17 –
4.4.2 Capacitance
See IEC 62391-1, 4.5.1, with the following details:
4.4.2.1 Measuring conditions
The ambient temperature shall be 20 °C ± 2 °C.
The measurement shall be made under the conditions of IEC 62391-1, 4.5.1.2, Class 3.
4.4.2.2 Requirements
The capacitance shall correspond to the rated value taking into account the tolerance.
4.4.3 Internal resistance
See IEC 62391-1, 4.6.2, with the following details.
NOTE The a.c. resistance method should be used when a correlation is found with the results of the d.c.
measuring method. The measuring method should be in accordance with IEC 62391-1, 4.6.1.
4.4.3.1 Measuring conditions
The ambient temperature shall be 20 °C ± 2 °C.
The measurement shall be made under the conditions of IEC 62391-1, 4.6.2.1, Class 3.
4.4.3.2 Requirements
The internal resistance shall meet the requirements of the detail specification.
4.5 Robustness of terminations
See IEC 62391-1, 4.9, with the following details.
The detail specification shall specify the test method and degree of severity to be used.
4.5.1 Initial measurement
The capacitance shall be measured according to 4.4.2.
4.5.2 Final inspection, measurements and requirements
The capacitors shall be visually examined and shall meet the requirements shown in Table 2.
4.6 Resistance to soldering heat
NOTE Not applicable to capacitors with screw terminations or other terminations not designed to be soldered, as
stated in the detail specification.
See IEC 62391-1, 4.10, with the following details.
4.6.1 Initial measurement
The capacitance shall be measured according to 4.4.2.

– 18 – 62391-2  IEC:2006
4.6.2 Conditions
No pre-drying.
The capacitors shall be subjected to method 1A of Test Tb.
Immersion time shall be 5 s ± 0,5 s.
4.6.3 Final inspection, measurements and requirements
The capacitors shall be visually examined and measured electrically and shall meet the
requirements shown in Table 2.
4.7 Solderability
See IEC 62391-1, 4.11, with the following details.
NOTE Not applicable to capacitors with screw terminations or other terminations not designed to be soldered, as
stated in the detail specification.
4.7.1 Final inspection, measurements and requirements
The capacitors shall be visually examined and shall meet the requirements shown in Table 2.
4.8 Rapid change of temperature
See IEC 62391-1, 4.12, with the following details.
4.8.1 Initial measurement
The capacitance shall be measured according to 4.4.2.
4.8.2 Conditioning
The capacitance shall be subjected to test Na for 5 cycles.
The duration of the exposure at each temperature limit shall be 30 min or 3 h as specified in
the detail specification.
The recovery period shall be 16 h.
4.8.3 Final inspection, measurements and requirements
After recovery, the capacitors shall be visually examined and measured electrically and shall
meet the requirements shown in Table 2.
4.9 Vibration
See IEC 62391-1, 4.13 with the following details.
4.9.1 Initial measurement
Capacitance shall be measured according to 4.4.2.

62391-2  IEC:2006 – 19 –
4.9.2 Test condition
Test Fc, Procedure B4, shall be applied with following severities.
Frequency range: 10-55 Hz
Amplitude: 0,75 mm or acceleration: 100 m/s (whichever is less stringent)
Total test time: 6 h
4.9.3 Final inspection, measurements and requirements
The capacitors shall be visually examined and measured and shall meet the requirements
shown in Table 2.
4.10 Endurance
See IEC 62391-1, 4.15, with the following details.
4.10.1 Initial measurement
The capacitance shall be measured according to 4.4.2.
4.10.2 Test conditions
Duration: 1 000 h for upper category temperature 70 °C grade capacitors;
2 000 h for upper category temperature 60 °C grade capacitors.
Applied voltage: category voltage, unless otherwise specified in the detail specification.
NOTE When the category voltage is different from the rated voltage, the sample tested is divided into two parts
and submitted to the rated temperature at the category voltage respectively.
4.10.3 Final inspection, measurements and requirements
After recovery for minimum of 16 h, the capacitors shall be visually examined and measured
and shall meet the requirements shown in Table 2.
4.11 Self-discharge
See IEC 62391-1, 4.8, with the followin
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