www.wima.com
Film Capacitors for Electronic Equipment
Edition 2023/2024
WIMA PROCESS CONTROL SYSTEM
REACH COMPLIANCE
SHIP-TO-STOCK DELIVERIES
CONFLICT MINERALS DECLARATION
TECHNICAL SUPPORT/DESIGN-IN
AEC-Q200 ACCORDANT
MADE IN GERMANY
2
04.23
®
Content
O
SMD Plastic Film Capacitors
Size Codes 1812 to 6054
Polyester film, metallized
WIMA SMD-PET
17
Polyethylene-naphthalate film, metallized
WIMA SMD-PEN
21
Polyphenylene-sulphide film, metallized
WIMA SMD-PPS
25
O
Subminiature Capacitors
PCM 2.5 mm
Polypropylen film, film/foil
WIMA FKP 02
30
Polyester film, metallized
WIMA MKS 02
32
O
Film/Foil Capacitors
PCM 5 mm
Polyester film, film/foil
WIMA FKS 2
35
Polypropylene film, film/foil
WIMA FKP 2
37
O
Film/Foil Capacitors
PCM 7.5 to 15 mm
Polyester film, film/foil
WIMA FKS 3
40
Polypropylene film, film/foil
WIMA FKP 3
43
O
Metallized Capacitors
PCM 5 mm
Polyester film, metallized
WIMA MKS 2
48
Polypropylene film, metallized
WIMA MKP 2
51
O
Metallized Capacitors
PCM 7.5 to 52.5 mm
Polyester film, metallized
WIMA MKS 4
54
Polypropylene film, metallized
WIMA MKP 4
61
O
Pulse Duty Capacitors
PCM 7.5 to 52.5 mm
Polypropylene film, double-sided metallized electrode
WIMA MKP 10
67
Polypropylene film, metal foil/single-sided metallized film
WIMA FKP 4
78
Polypropylene film, metal foil/double-sided metallized film
WIMA FKP 1
81
O
RFI-Capacitors
PCM 7.5 to 37.5 mm
Polypropylene film, metallized Class X2
WIMA MKP-X2
90
Polypropylene film, metallized Class Y2
WIMA MKP-Y2
95
Polypropylene film, metallized Class X1
WIMA MKP-X1 R
98
O
Filter Capacitors
Polypropylene film, metallized
WIMA MKP 4F
103
O
Snubber Capacitors
Polypropylene film, double-sided metallized electrode
WIMA Snubber MKP
110
Polypropylene film, metal foil/metallized film
WIMA Snubber FKP
116
O
GTO Capacitors
Polypropylene film, double-sided metallized electrode
WIMA GTO MKP
124
O
DC-LINK Capacitors
Polypropylene film, metallized
WIMA DC-LINK MKP 4
129
Polypropylene film, metallized
WIMA DC-LINK MKP 6
142
Polypropylene film, metallized
WIMA DC-LINK HC
148
Polypropylene film, metallized
CUSTOMIZED
150
O
PowerBlock
Double-Layer capacitor (SuperCap) modules
WIMA PowerBlock
152
O
General Information
Explanation of important terminology
3
Construction principles of WIMA film capacitors
4
Typical characteristics and graphs of the plastic film dielectric used
5
Technical data and advantages of WIMA capacitors
9
Selection of WIMA capacitors for pulse applications
11
Recommendation for processing and application of WIMA capacitors
13
WIMA quality and environmental philosophy
15
WIMA part number system
155
Types of packaging and packing units for WIMA capacitors
156
WIMA representations
161
3
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®
Nominal Capacitance
The nominal capacitance of a capacitor
is usually given in pF, nF or
F.
Operating/Rated Voltage
Each capacitor is designed for a specified
rated voltage in continuous operation.
This is usually only valid for ambient
temperatures of T T + 85° C. In the case
of higher temperatures a derating factor
must be applied to the rated voltage
from 85° C.
Insulation Resistance/Time Constant
The insulation resistance is normally
expressed in megohms (M
Ω) and is mea -
sured at a specified voltage after 1 minute.
The time constant defines the time in
seconds, in which the voltage across the
capacitor self-discharges to 37 % of the
fully charged state and it is expressed as
= R
is
x C.
The insulation resistance or time costant
value denotes the quality of the dielectric
insulation.
Dissipation Factor
The dissipation factor tan is the quotient
of the resistive and reactive parts of the
impedance.
The dielectric losses are illustrated
by R in the equivalent circuit diagram.
The insulation resistance R
is
is in parallel
with R, and affects the tan
only at very
low frequencies.
The dissipation factor is also affected by
the resistance of both electrodes and of
the termination – electrode interface. This
is represented by the series resistance r.
L represents the remaining self-inductance.
R
C
L
r
R
is
Capacitance Tolerance
The tolerance is the permissible actual
capac
itance relative to the nominal capa-
citance and it is defined in per cent. The
tolerance is to be measured at + 25° C
and the permissible tolerance is only valid
at the time of shipment.
The capacitance may change after long
storage or long usage.
The tolerance, with the exception of
± 20 %, is usually marked on the capa-
citor body in clear digits.
Temperature Coefficient of Capacitance
The temperature coefficient expresses the
change in capacitance with temperature,
relative to the capacitance at the referen ce
temperature of + 20° C; it is usually
expressed in ppm per °C.
C
T
= C
20
x 1 + x (T – 20° C)
C
20
= capacitance at +20° C
C
T
= capacitance at T
= may be positive or negative.
Pulse Stressing
The ratings on pulse rise time are based
on tests in accordance with DIN-IEC
60384 part 1.
The test voltage corresponds to the rated
voltage and the test comprises 10 000
pulses with a repetition frequency of 1 Hz.
The catalogue ratings are in accordance
with the CECC spec ifications which spe-
cify that the test pulse rise time shall be
10 times the catalogue rating.
It should also be noted that the pulse
rise time (F) i.e. V/
sec also provides the
maximum current capability, as it can be
determined from the following formula.
I = F x C x 1.6
C in F / I in amps.
The information on the pulse rise time
refers to pulses equal to the rated voltage
so that, at lower operating voltages,
the permissible pulse rise times may be
in creased.
Warning Notice/Technical Support
AC voltage load at the mains
Anticipating possible interfering pulses, DC
voltage capacitors must not be operated
at the mains (power line), irrespective of
the rated AC voltage. For this purpose,
use approved interference suppression
capacitors only.
Thermal load in the application
If a plastic film capacitor is overstressed
due to inappropriate usage under AC vol-
tage conditions, the temperature inside the
component may rise to an imper missibly
high level. Thus, the dielectric film may
subsequently be damaged leading to a
short circuit or formation of smoke and
even fire in the capacitor.
This may also happen if the capacitor is
overheated by an external heat source.
Shock and/or vibration load for larger
case sizes
For increased shock and vibration appli-
cations involving larger case sizes (i.e.,
PCM 22.5 mm pin spacing or greater), it
is recommended to fix capacitors in an
appropriate way; or special pin and plate
terminations may be required respectively
to minimize lead separation from the
capac itor element or the solder joint.
Processing
When processing plastic film capacitors
it is mandatory to observe the application
recommendations with regard to soldering
and/or cleaning and drying processes.
General remarks
All catalogue data, range surveys and
application data correspond to the actual
state of the art and were elaborated as
thoroughly and precisely as possible. They
are to be understood as general informa-
tion, and the right for amendments and
construction changes is reserved. Special
customized designs which deviate from our
catalogue data, irrespective of whether
being based on factory standards, specifi-
cations or related data, do not release the
user from his duty of care with regard to
incoming goods inspection and production
monitoring. In case of the components
being purchased through second or third
suppliers we urgently ask to compare the
technical details with the data given by
the manufacturer. In cases of doubt we
recommend use is made of our technical
support, since we do not take any respon-
sibility for damages caused by inappro-
priate use or processing of our capacitors.
General Information
Explanation of Important Terminology