WIMA - Competence in Capacitors
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Frequently Asked Questions

WIMA Certificates

All WIMA manufacturing sites are certified according to DIN EN ISO 9001:2015. Relevant capacitor series are tested according to AEC-Q200 standard. You can download these certificates directly as PDF files. After filling out a form, you can download current certificates for REACH, RoHS or Conflict Minerals. Your data will be treated confidentially. Please also read our Privacy Policy.

ISO 9001 Certified

Conflict Minerals Declaration

AEC-Q200 Certified

ROHS Compliance

Part Change Notification

REACH Compliance

Automotive Applications

In the automotive sector, film capacitors have decisive advantages compared to electrolytic capacitors such as high rated voltage per component, very low loss factor, very high insulation resistance, excellent self-healing properties, high service life expectancy/reliability, non-polar construction and non-critical failure mode.



E-Mobility

WIMA film capacitors for many applications in electromobility.

AEC-Q200

Relevant capacitor series tested according to the AEC-Q200 standard.

Application overview

Overview of WIMA types for applications in the automotive industry.

Substitution of obsolete polycarbonate (PC) capacitors

After the discontinuation of Polycarbonate film (end of 2000) as a capacitor dielectric by the only manufacturer, Bayer AG/Germany, we have removed all MKC ranges (metallized construction) and FKC ranges (film/foil construction) using this capacitor film from our range of products latest after inventory of film has run out.
However, the question of which capacitors can be used to replace the PC series is still of interest. The following comparisons may be of assistance in making decisions.
The special feature of Polycarbonate (PC) capacitors is the almost constant course of capacitance drift versus temperature and the suitability for special applications in the field of higher frequencies respectively.

Capacitance change with temperature

Dissipation factor change with frequency

Substitution by Polyester (PET) Capacitors

Capacitance change with temperature

Results: In the field of normal application temperature 0/+20 to +80°C Polyester (PET) shows a comparable linearity of the capacitance course in the positive field in comparison with Polycarbonate (PC) which shows a slightly negative course. The capacitance inconstancy versus time is basically identical with both dielectrics.

Substitution suggestions for metallized capacitors:


Obsolete WIMA type PCM Suggested WIMA type PCM Replace also obsolete competitor series
WIMA MKC 02 2.5 WIMA MKS 02 2.5
WIMA MKC 2 5 WIMA MKS 2 5 MKC 1858 / CMK
WIMA MKC 3 7.5 WIMA MKS 4 7.5 CMK
WIMA MKC 4 >10 WIMA MKS 4 >10 MKC 1862 / MKC 344 / CMK


Substitution suggestions for film/foil capacitors:


Obsolete WIMA type PCM Suggested WIMA type PCM Replace also obsolete competitor series
WIMA FKC 2 5 WIMA FKS 2 5 KC 1850 / CFR (CMK)
WIMA FKC 3 >7.5 WIMA FKS 3 >7.5 CMK
Note: size comparisons between series are possible for the most parts.


Substitution suggestions for Polypropylene (PP) capacitors:

Capacitance change with temperature

Dissipation factor change with frequency

Results: in comparison to Polycarbonate (PC), Polypropylene (PP) has a lower dissipation factor throughout the course of the whole temperature field.

Substitution suggestions for metallized capacitors:


Obsolete WIMA type PCM Suggested WIMA type PCM Replace also obsolete competitor series
WIMA MKC 2 5 WIMA MKP 2 5 MKC 1858 / CMK
WIMA MKC 3 7.5 WIMA MKP 4 7.5 CMK
WIMA MKC 4 >10 WIMA MKP 4 >10 MKC 1862 / MKC 344 / CMK
WIMA MKC 10 >7.5 WIMA MKP 10 >7.5


Substitution suggestions for film/foil capacitors:


Obsolete WIMA type PCM Suggested WIMA type PCM Replace also obsolete competitor series
WIMA FKC 02 2.5 WIMA FKP 02 2.5
WIMA FKC 2 5 WIMA FKP 2 5 KC 1850 / CFR (CMK)
WIMA FKC 3 >7.5 WIMA FKP 3 >7.5 CMK
Note: size comparisons between series are possible for the most parts.

Marking of WIMA capacitors

SMD capacitors


Marking of WIMA SMD capacitors was gradually ceased as of July 2003. Identification is possible by the labelling of packages and delivery notes respectively.

Through-Hole Capacitors


In general, WIMA through-hole capacitors are marked on the front side of the box in plain text with brand name, capacitor series, capacitance, nominal voltage, date code and tolerance. Capacitors with PCM smaller than 15 mm will have the tolerance indicated on the reverse. Standard tolerance 20% is not marked.

PCM 2.5mm and PCM 5mm film/foil

PCM 5mm metallized*

Capacitance Code
0.01 µF
0.015 µF
0.022 µF
0.033 µF
0.047 µF
0.068 µF
10n
15n
22n
33n
47n
68n
0.1 µF
0.15 µF
0.22 µF
0.33 µF
0.47 µF
0.68 µF
µ1
µ15
µ22
µ33
µ47
µ68
1,0 µF
1.5 µF
2.2 µF
3.3 µF
4.7 µF
6.8 µF
1µ
1µ5
2µ2
3µ3
4µ7
6µ8
10 µF 10µ

PCM 7.5mm and 10mm

PCM 15mm through 37.5mm

or

or

The series name MKS 2, FKP 3 etc. is composed as follows:

  • The first letter indicates the type of construction
    "M"= metallized construction
    "F"= film/foil construction (brands of other manufacturers are missing this letter)
  • The second letter "K" stands for plastic film capacitors.
  • The third letter indicates the dielectric film used
  • "S"= Polyester (PET) (other manufacturers are using "T")
    "P"= Polypropylene (PP)
  • The numbers following are WIMA-specific markings.
Metallized paper capacitors are marked with "MP".

The cases of 2.5 mm and 5 mm capacitors are too small to imprint with the series type (i.e. MKS 2, FKS 2 etc.). Instead, these capacitors must be identified by different colours of the marking inks.

PCM 2.5 mm Case Marking Example
FKP 02 Red Black afkp02
MKS 02 Red Silver amks02
PCM 5 mm Case Marking Example
FKS 2 Red White afks2
FKP 2 Red Black afkp2
MKS 2 Red Silver/White*
amks2bmks2
MKP 2 Red Black*
amkp2bmkp2
* As of September 2005 WIMA changes step by step the metallized capacitors in PCM 5 mm to top marking. Following series are concerned:

WIMA MKS 2: (Marking: White)
WIMA MKP 2: (Marking: Black)

Durability and storage of WIMA capacitors

Storage of WIMA SMD Capacitors


WIMA Series: WIMA SMD-PET, WIMA SMD-PEN, WIMA SMD-PPS

Originally Sealed Packing Units:
Two years and more inside the moisture protection bag (with ESD/EMI shield / water vapour-proof in accordance with IPC/JEDEC J-STD-033), at appropriate and controlled storage conditions.

Once opened Packing Units:
Opened packing units should be consumed instantly. In case that storage is necessary it is recommended to return the opened packing unit into the moisture protection bag and reseal air-tight. Specific storage under controlled conditions, e.g. at 15°C ≤ T ≤ 40°C, relative humidity < 40% r. h.

Improper storage conditions, e. g. at extremely high or low temperatures and humidity, may lead to reduction of the storage time.

Storage of WIMA Capacitors in Rectangular Plastic Box


WIMA Series: Capacitors of all WIMA Series with unidirectional Pins for „THT Technology“ as well as with Lug Terminations.

Contrary to capacitors of deviating construction e. g. electrolytic capacitors with liquid electrolyte there is no best-before date for customary plastic film capacitors.
Corresponding to reference values of individual typical parameters, in accordance with IEC / EN specifications a storage time

t > 2 a

can be assumed. This period is accounted for by e.g. the solderability test applied to the wire terminations (as per IEC 60068-2-20) in the sense of an ageing test level

Δt = 16 h at T = 155°C.

The terminations of WIMA plastic film and metallized paper capacitors are tested according to these requirements.

The surface refinement of the leads (pins) of WIMA components is implemented using a pure matte tin (Sn) layer > 5 μm thickness. Thus, even after storage of two years or more, under monitored ambient conditions - typically in the range +10°C < T < +40°C, relative humidity < 75% r. h. - no negative effects are to be expected for the capacitors in terms of aging, which manifests itself, for example, in processing with very good soldering results.
From case to case it is advisable that the user checks the solderability of capacitors having been stored for a longer period of time and / or under uncertain conditions.

Recommendation for Processing and Application of SMD Capacitors

Layout Form


The components can generally be positioned on the carrier material as desired. In order to prevent soldering shadows or ensure regular temperature distribution, extreme concentration of the components should be avoided. In practice, it has proven best to keep a minimum distance of the soldering surfaces between two WIMA SMDs of twice the height of the components.
As a basic principle for wave soldering, alignment of the soldering surfaces in accordance with the transport direction of the printed circuit board through the soldering wave is recommended.

Solder Pad Recommendation

emasssmd



Size code L ±0.3 W ±0.3 d a min. b min. c max.
1812
2220
2824
4030
5040
6054
4.8
5.7
7.2
10.2
12.7
15.3
3.3
5.1
6.1
7.6
10.2
13.7
0.5
0.5
0.5
0.5
0.7
0.7
1.2
1.2
1.2
2.5
2.5
2.5
3.5
4
4
6
6
6
3.5
4.5
6.5
9
11.5
14
Dims. in mm.

Processing


The processing of SMD components
- assembling
- soldering
- electrical final inspection / calibrating

must be regarded as a complete process. The soldering of the printed circuit board, for example, can constitute considerable stress on all the electronic components. The manufacturer's instructions on the processing of the components are mandatory.

Soldering process


Temperature/time graph for the permissible processing temperature of the WIMA SMD film capacitors for typical convection soldering processes.

SMD-PET
Size code Tmax.
1812
2220
2824
4030
5040
6054
220°C
230°C
230°C
230°C
240°C
250°C




SMD-PEN
Size code Tmax.
1812
2220
2824
250°C
250°C
250°C
SMD-PPS
Size code Tmax.
1812
2220
2824
4030
5040
6054
250°C
250°C
250°C
250°C
250°C
250°C

Due to versatile procedures exact processing parameters for re-flow soldering processes cannot be specified. The graph depicted is to be understood as a recommendation to help establishing a suitable soldering profile fulfilling the requirements in practice at the user.

During processing a max. temperature of T=210° C inside the component should not be exceeded. Due to the differing heat absorption the length of the soldering process should be kept as short as possible for smaller size codes.

SMD Handsoldering


WIMA SMD capacitors with plastic film dielectric are generally suitable for hand-soldering with a soldering iron where, however, similar to automated soldering processes, a certain duration and temperature should not be exceeded. These parameters are dependent on the physical size of the components and the relevant heat absorption involved.

Size code Temperature °C/°F Time duration
1812
2220
2824
4030
5040
6054
250/482
250/482
260/500
260/500
260/500
260/500
2 sec plate 1 / 5 sec off / 2 sec plate 2
3 sec plate 1 / 5 sec off / 3 sec plate 2
3 sec plate 1 / 5 sec off / 3 sec plate 2
5 sec plate 1 / 5 sec off / 5 sec plate 2
5 sec plate 1 / 5 sec off / 5 sec plate 2
5 sec plate 1 / 5 sec off / 5 sec plate 2

The above data are to be regarded as guideline values and should serve to avoid damage to the dielectric caused by excessive heat during the soldering process. The soldering quality depends on the tool used and on the skill and experience of the person with the soldering iron in hand.

Solder Paste


To achieve reliable soldering results one of the following solder alloys have from case to case proven being workable:

Lead-free solder paste
Sn - Bi
Sn - Zn (Bi)
Sn - Ag - Cu (suitable for SMD-PET 5040/6054 and SMD-PPS)
Solder paste with lead
Sn - Pb - Ag (Sn60-Pb40-A, Sn63-Pb37-A)

Washing


WIMA SMD components with plastic encapsulation - like all other components of similar construction irrespective of the make - cannot be regarded as hermetically sealed. Due to today’s common washing substances, e. g. on aqueous basis instead of the formerly used halogenated hydrocarbons, with enhanced washing efficiency it became obvious that assembled SMD capacitors may show an impermissibly high deviation of the electrical parameters after a corresponding washing process. Hence it is recommended to refrain from applying industrial washing processes for WIMA SMD capacitors in order to avoid possible damages.

Initial Operation / Calibration of the Device


Due to the stress which the components are subjected to during processing, reversible parameter changes occur in almost all electronic components. The capacitance recovery accuracy to be expected with careful processing is within a scope of |ΔC/C| < 5%
For the initial operation of the device a minimum storage time of t > 24 hours is to be taken into account. With calibrated devices or when the application is largely dependent on capacitance it is advisable to prolong the storage time to t > 10 days In this way ageing effects of the capacitor structure can be anticipated. Parameter changes due to processing are not to be expected after this period of time.

Humidity Protection Bags


Taped WIMA SMD capacitors are shipped in humidity protection bags according to JEDEC standard (ESD/EMI-shield / water-vapour proof). Under controlled conditions the components can be stored two years and more in the originally sealed bag. Opened packing units should immediately be used up for processing. If storage is necessary the opened packing units should be stored air-tight in the original plastic bag.

Reliability


Taking account of the manufacturer's guidelines and compatible processing, the WIMA SMD stand out for the same high quality and reliability as the analogous through-hole WIMA series. The technology of metallized film capacitors used e.g. in WIMA SMD achieves the best values for all fields of application. The expected value is about:

λ0 < 2 fit

Furthermore the production of all WIMA components is subject to the regulations laid down by ISO 9001:2015 as well as the guidelines for component specifications set out by IEC quality assessment system (IECQ) for electronic components.

Electrical Characteristics and Fields of Application


Basically the WIMA SMD series have the same electrical characteristics as the analogous through-hole WIMA capacitors. Apart from the advantages shown in the diagrams of the electrical parameters in comparison with X7R ceramic and tantalum capacitors, WIMA SMD capacitors have a number of other outstanding qualities compared to ceramic or tantalum dielectrics:

  • favourable pulse rise time
  • low ESR
  • low dielectric absorption
  • available in high voltage series
  • large capacitance spectrum
  • stand up to high mechanical stress
  • good long-term stability
As regards technical performance as well as quality and reliability, the WIMA SMD series offer the possibility to cover nearly all applications of conventionally through-hole film capacitors with SMD components. Furthermore, the WIMA SMD series can now be used for all the demanding capacitor applications for which, in the past, the use of through-hole components was mandatory:

  • measuring techniques
  • oscillator circuits
  • differentiating and integrating circuits
  • A/D or D/A transformers
  • sample and hold circuits
  • automotive electronics
With the WIMA SMD programme available today, the major part of all plastic film capacitors can be replaced by WIMA SMD components. The field of application ranges from standard coupling capacitors to use in switch-mode power supplies as filter or charging capacitors with high voltage and capacitance values, as well as in telecommunications e.g. the well-known telephone capacitor 1µF/250VDC.

Recommendation for Processing and Application of Through-Hole Capacitors

Soldering Process


Internal temperature of the capacitor must be kept as follows:

Polyester: preheating:
soldering:
Tmax < 125° C
Tmax < 135° C
Polypropylene: preheating:
soldering:
Tmax < 100° C
Tmax < 110° C

Single wave soldering:
Soldering bath temperature: T < 260°C
Dwell time: t < 5 sec
Double wave soldering:
Soldering bath temperature T < 260°C
Dwell time: ∑ t < 5 sec[/fusion_text][fusion_text]

Wave soldering


Typical temperature/time graph for double wave soldering.



Due to different soldering processes and heat requirements the graphs are to be regarded as a recommendation only.

Application guide for WIMA capacitors

Overview

Fields of Applications
Automotive Power Lighting Medical Consumer Telecom/ Data New Enegy
Product Family Range Description Picture              
SMD Capacitors Size codes 1812 - 6054
SMD-PET/-PEN/-PPS
Miniature Capacitors PCM 2.5 mm
MKS 02, FKP 02
Film/Foil Capacitors PCM 5 - 15 mm
FKS 2, FKP 2, FKS 3, FKP 3
Metallized Capacitors PCM 5 - 52.5 mm
MKS 2, MKP 2, MKS 4, MKP 4
Pulse Capacitors PCM 7.5 - 52.5 mm
MKP 10, FKP 4, FKP 1
RFI Capacitors PCM 7.5 - 37.5 mm
MKP-X2, MKP-X1 R, MKP-Y2
Filter Capacitors PCM 27.5 - 52.5 mm
MKP 4F
Snubber Capacitors Variable terminations
Snubber MKP/FKP
GTO Capacitors Axial screw connections
GTO MKP
DC-LINK Capacitors Variable terminations
DC-LINK MKP 4/6/HC
Customized
SuperCap Modules Customized
PowerBlocks

Automotive

Fields of Application
Safety Auxiliaries Powertrain Features
Airbag control unit Braking system (ABS/ESC) Tire pressure monitoring unit HID lamps Small motor drives (e.g. seats, mirrors windows etc.) Electrical power steering Remote keyless entry DC/DC converter and inverter, Electric drives Fuel pump, diesel filter control unit
SMD Capacitors
0.01 µF - 6,8 µF
63 - 1000 VDC
Size codes 1812 - 6054



SMD-PPS

SMD-PPS

SMD-PET
SMD-PEN
SMD-PPS

SMD-PET
SMD-PEN

SMD-PET
SMD-PEN

SMD-PET
SMD-PEN

SMD-PET
SMD-PEN

  • Operating temperature up to 140°C
  • Operating life >300000h
  • Suitable for lead-free soldering at T<250°C
Film Capacitors
1000 pF - 680 µF
50 - 2000 VDC
PCM 2.5 - 52.5 mm



MKS 02
MKS 2
MKS 4
FKS 2
FKS 3
MKS 02
MKS 2
MKS 4
FKS 2
FKS 3
MKP 2
MKP 4
MKS 02
MKS 2
MKS 4
MKP 2
MKP 4
FKS 2
FKS 3
MKP 2
MKP 4
MKS 02
MKS 2
MKS 4
  • Operating temperature up to 125°C (MKS)
  • Operating life >300000h
  • Smallest PCM 2.5 mm
  • AEC-Q200 qualified (MKS 2, MKP 2, MKS 4, MKP 4)
Pulse Capacitors
100 pF - 47 µF
100 - 6000 VDC
PCM 7.5 - 52.5 mm


MKP 10
FKP 4
FKP 1

MKP 2
MKP 4
MKP 10
FKP 4
FKP 1

MKP 2
MKP 4
  • Operating temperature up to 105°C
  • Operating life >300000h
  • Highest du/dt
  • AEC-Q200 qualified
RFI Capacitors
1000 pF - 10 µF
300 - 440 VAC
PCM 7.5 - 37.5 mm

MKP-X2
MKP-X1 R
MKP-Y2
  • Operating temperature up to 105°C
  • Operating life >300000h
  • High degree of interference suppression and low ESR
  • Class X2, X1, Y2
  • AEC-Q200 qualified
Filter Capacitors
0.68 µF - 75 µF
230 - 440 VAC
PCM 27.5 - 52.5 mm


MKP 4F
  • Operating temperature up to 105°C
  • Operating life >60000h
  • High AC voltage capabilities
  • AEC-Q200 qualified
Snubber Capacitors
0.01 µF - 8 µF
630 - 4000 VDC
Variable contacts


Snubber MKP
Snubber FKP
  • Operating temperature up to 105°C
  • Operating life >300000h
  • Various contact configurations
  • AEC-Q200 qualified
DC-LINK Capacitors
1 µF - 8250 µF
400 - 1500 VDC
Variable contacts


DCL MKP 4
DCL MKP 6
DCL HC
customized
  • Operating temperature up to 105°C
  • Operating life >100000h
  • 2-pin, 4-pin, screwable plates or screw connections
  • AEC-Q200 qualified (DCL MKP 4)
PowerBlock Modules
Customized


SuperCap modules for boardnet stabilization and safety backup SuperCap modules for local power supply SuperCap modules for recuperation of breaking energy/ power boost
  • Operating temperature -40°C up to +65°C
  • Operating life >10 years
  • Discharge current up to several 1000A

Power Electronics

Fields of Application
Power Electronics Features
Battery charger Frequency converter Power supply/ SMPS UPS AC filter, harmonic filter Electronic power meter
SMD Capacitors
0.01 µF - 6.8 µF
63 - 1000 VDC
Size codes 1812 - 6054



SMD-PET
SMD-PEN

SMD-PET
SMD-PEN
SMD-PPS

  • Operating temperature up to 140°C (PPS)
  • Operating life >300000h
  • Suitable for lead-free soldering at T <250°C
Film Capacitors
1000 pF - 680 µF
50 - 2000 VDC
PCM 2.5 - 52.5 mm

MKS 02
MKS 2
MKS 4

MKP 2
MKP 4

FKS 2
FKS 3
MKS 02
MKS 2
MKS 4

MKP 2
MKP 4

FKS 2
FKS 3
  • Operating temperature up to 125°C (MKS)
  • Operating life >300000h
  • Smallest PCM 2.5 mm
Pulse Capacitors
100 pF - 47 µF
100 - 6000 VDC
PCM 7.5 - 52.5 mm


MKP 10
FKP 4
FKP 1

MKP 2
MKP 4

MKP 10
FKP 4
FKP 1

MKP 2
MKP 4

  • Operating temperature up to 105°C
  • Operating life >300000h
  • Highest du/dt
RFI Capacitors
1000 pF - 10 µF
300 - 440 VAC
PCM 7.5 - 37.5 mm


MKP-X1
MKP-X2
MKP-Y2
MKP-X1
MKP-X2
MKP-Y2
MKP-X1
MKP-X2
MKP-Y2
  • Operating temperature up to 105°C
  • Operating life >300000h
  • High degree of interference suppression and low ESR
Filter Capacitors
0.68 µF - 75 µF
230 - 440 VAC
PCM 27.5 - 52.5 mm


MKP 4F

MKP 4F
  • Operating temperature up to 105°C
  • Operating life >60000h
  • High AC voltage capabilities
Snubber Capacitors
0.01 µF - 8 µF
630 - 4000 VDC
Variable contacts


Snubber MKP
Snubber FKP

Snubber MKP
Snubber FKP

Snubber MKP
Snubber FKP

  • Operating temperature up to 105°C
  • Operating life >300000h
  • Various contact configurations
DC-LINK Capacitors
1 µF - 8250 µF
400 - 1500 VDC
Variable contacts


DC-LINK MKP 4
DC-LINK MKP 6
DC-LINK HC
customized
  • Operating temperature up to 105°C
  • Operating life >100000h
  • 2-pin, 4-pin, screwable plates or screw connections
SuperCap Modules
customized


PowerBlock as uninterruptible power supply (UPS)
  • Operating temperature -40°C to +65°C
  • Operating life >10 years
  • Discharge current up to several 1000A

Lighting

Fields of Application
Lighting Industry Features
Electronic ballasts Energy saving lamps
Metallized Capacitors
1000 pF - 680 µF
50 - 2000 VDC
PCM 5 - 52.5 mm

MKP 2
MKS 4
MKP 4
MKS 2
MKP 2
MKS 4
MKP 4
  • Polyethylene-terephthalate (PET) dielectric
  • Good resistiveness to increased temperatures
  • Very low dissipation factor
  • Self-healing properties

  • Polypropylene (PP) dielectric
  • Negative capacitance change versus temperature
  • Very low dissipation factor
  • Self-healing properties
Pulse Capacitors
100 pF - 47 µF
100 - 6000 VDC
PCM 7.5 - 52.5 mm


MKP 10
FKP 4
FKP 1
MKP 10
FKP 4
FKP 1
  • Polypropylene (PP) dielectric
  • High pulse duty
  • Internal series connection (MKP 10 > 630 VDC, FKP 4, FKP 1)
  • Negative capacitance change versus temperature
  • Very low dissipation factor
  • Self-healing properties
RFI Capacitors
1000 pF - 10 µF
230 - 440 VAC
PCM 7.5- 37.5 mm
Class X1, X2, Y2


MKP-X1
MKP-X2
MKP-Y2
MKP-X1
MKP-X2
MKP-Y2
  • Polypropylene (PP) dielectric
  • High degree of interference suppression due to good attenuation and low ESR
  • Self-healing properties

Medical

Fields of Application
Medical Equipment Features
Imaging equipment (CT, MRT, X-Ray, ultrasound) Anesthesia equipment Cleaning equipment Defibrillation devices Patient care monitoring (glucose meter, blood gas analyser, telemetry) Respiration technology Laser technology
SMD Capacitors
0.01 µF - 6.8 µF
63 - 1000 VDC
Size codes 1812 - 6054



SMD-PET
SMD-PEN
SMD-PPS

SMD-PET
SMD-PEN
SMD-PPS

SMD-PET
SMD-PEN
SMD-PPS

SMD-PET
SMD-PEN
SMD-PPS

  • Operating temperature up to 140°C
  • Operating life >300000h
  • Suitable for lead-free soldering at T<250°C
Film Capacitors
1000 pF - 680 µF
50 - 2000 VDC
PCM 2.5 - 52.5 mm


MKP 2
MKP 4
MKS 02
MKS 2
MKS 4

MKP 2
MKP 4
MKS 02
MKS 2
MKS 4

MKP 2
MKP 4
MKS 02
MKS 2
MKS 4

MKP 2
MKP 4
MKS 02
MKS 2
MKS 4

MKP 2
MKP 4
  • Operating temperature up to 125°C
  • Operating life >300000h
  • Smallest PCM 2.5 mm
Pulse Capacitors
100 pF - 47 µF
100 - 6000 VDC
PCM 7.5 - 52.5 mm


MKP 10
FKP 4
FKP 1
MKP 10
FKP 4
FKP 1
MKP 10
FKP 4
FKP 1
  • Operating temperature up to 105°C
  • Operating life >300000h
  • Highest du/dt
RFI Capacitors
1000 pF - 10 µF
300 - 440 VAC
PCM 7.5 - 27.5 mm


MKP-X2
MKP-X1 R
MKP-Y2
MKP-X2
MKP-X1 R
MKP-Y2
MKP-X2
MKP-X1 R
MKP-Y2
MKP-X2
MKP-X1 R
MKP-Y2
MKP-X2
MKP-X1 R
MKP-Y2
MKP-X2
MKP-X1 R
MKP-Y2
  • Operating temperature up to 105°C
  • Operating life >300000h
  • High degree of interference suppression and low ESR
Filter Capacitors
0.68 µF - 75 µF
230 - 440 VAC
PCM 27.5 - 52.5 mm


MKP 4F
  • Operating temperature up to 105°C
  • Operating life >60000h
  • High AC current capability
Snubber Capacitors
0.01 µF - 8 µF
630 - 4000 VDC
Variable terminations


Snubber MKP
Snubber FKP
  • Operating temperature up to 105°C
  • Operating life >300000h
  • Various contact configurations
GTO Capacitors
1.0 µF - 100 µF
400 - 2000 VDC
Axial screw connection


GTO MKP
  • Operating temperature up to 85°C
  • Operating life >300000h
  • Axial screw and thread connections
SuperCap Modules
customized


PowerBlock
  • Operating temperature -40°C to +65°C
  • Operating life >10 years
  • Discharge current up to several 1000A

Consumer

Fields of Applications
Consumer and Household Electronics Features
High-end audio systems Amplifier LCD / Plasma TVs Set top boxes Video systems Control units for home applications White goods (induction cooker, ignition units etc.)
SMD Capacitors
0.01 µF - 6.8 µF
63 - 1000 VDC
Size codes 1812-6054



SMD-PPS

SMD-PET
SMD-PEN
SMD-PPS

SMD-PET
SMD-PEN

SMD-PET
SMD-PEN

SMD-PET
SMD-PEN

SMD-PET
SMD-PEN

  • Operating temperature up to 140°C
  • Operating life >300000 h
  • Suitable for lead-free soldering at T<250°C
Film Capacitors
27 pF - 680 µF
50 - 2000 VDC
PCM 2.5 - 52.5 mm

MKS 02
MKS 2
MKS 4

MKP 2
MKP 4

FKP 02
FKP 2
FKP 3

MKS 02
MKS 2
MKS 4

MKP 2
MKP 4

FKP 02
FKP 2
FKP 3
MKP 2
MKP 4
MKS 02
MKS 2
MKS 4

MKS 02
MKS 2
MKS 4

MKP 2
MKP 4

MKS 02
MKS 2

MKP 2
MKP 4

FKS 2
FKS 3
  • Operating temperature up to 125°C
  • Operating life >300000 h
  • Smallest PCM 2.5 mm
Pulse Capacitors
100 pF - 47 µF
100 - 6000 VDC
PCM 7.5 - 52.5 mm


MKP 10 MKP 10 MKP 10 MKP 10
FKP 4
FKP 1
MKP 10
FKP 4
FKP 1
  • Operating temperature up to 105°C
  • Operating life >300000 h
  • Highest du/dt
RFI Capacitors
1000 pF - 10 µF
300 - 440 VAC
PCM 7.5 - 37.5 mm


MKP-X1
MKP-X2
MKP-Y2
MKP-X1
MKP-X2
MKP-Y2
MKP-X1
MKP-X2
MKP-Y2
MKP-X1
MKP-X2
MKP-Y2
MKP-X1
MKP-X2
MKP-Y2
MKP-X1
MKP-X2
MKP-Y2
  • Operating temperature up to 105°C
  • Operating life >300000 h
  • High degree of interference suppression and low ESR (MP)
Snubber Capacitors
0.01 µF - 8 µF
680 - 4000 VDC
Variable terminations


Snubber MKP
Snubber FKP
  • Operating temperature up to 105°C
  • Operating life >300000 h
  • Various contact configurations

Telecom/
Data

Fields of Application
Telecommunication / Data Processing Features
Power supply Splitter Data processing systems (server etc.) Network devices (router, switcher, hubs, modems) Wireless communication (WLAN, UMTS etc.) Memory backup
SMD Capacitors
0.01 µF - 6.8 µF
63 - 1000 VDC
Size codes 1812-6054



SMD-PET
SMD-PEN
SMD-PPS

SMD-PET
SMD-PEN
SMD-PPS

SMD-PET
SMD-PEN
SMD-PPS

SMD-PET
SMD-PEN
SMD-PPS

 
  • Operating temperature up to 140°C
  • Operating life >300000 h
  • Suitable for lead-free soldering at T<250°C
Film Capacitors
1000 pF - 680 µF
50 - 2000 VDC
PCM 2.5 - 52.5 mm

MKS 02
MKS 2
MKS 4

MKP 2
MKP 4
MKS 02
MKS 2
MKS 4

MKP 2
MKP 4

FKS 2
FKS 3
MKS 02
MKS 2
MKS 4

MKP 2
MKP 4

FKS 2
FKS 3
MKS 02
MKS 2
MKS 4

MKP 2
MKP 4

FKS 2
FKS 3
 
  • Operating temperature up to 125°C
  • Operating life >300000 h
  • Smallest PCM 2.5 mm
Pulse Capacitors
100 pF - 47 µF
100 - 6000 VDC
PCM 7.5 - 52.5 mm


MKP 10
FKP 4
FKP 1
MKP 10
FKP 4
FKP 1
MKP 10
FKP 4
FKP 1
MKP 10
FKP 4
FKP 1
 
  • Operating temperature up to 105°C
  • Operating life >300000 h
  • Highest du/dt
RFI Capacitors
1000 pF - 10 µF
300 - 440 VAC
PCM 7.5 - 37.5 mm


MKP-X1
MKP-X2
MKP-Y2
MKP-X1
MKP-X2
MKP-Y2
MKP-X1
MKP-X2
MKP-Y2
  • Operating temperature up to 105°C
  • Operating life >300000 h
  • High degree of interference suppression and low ESR
SuperCap Modules
customized


PowerBlock
  • Operating temperature -40°C up to +65°C
  • Operating life >10 years
  • Discharge current up to several 1000A

New Energy

Fields of Application
New Energy Features
Energy storage Converter Power supply UPS Grid interface
Pulse Capacitors
100 pF - 47 µF
100 - 6000 VDC
PCM 7.5 - 52.5 mm


MKP 10
FKP 4
FKP 1

MKP 2
MKP 4
MKP 10
FKP 4
FKP 1

MKP 2
MKP 4
MKP 10
FKP 4
FKP 1

MKP 2
MKP 4
  • Operating temperature up to 105°C
  • Operating life >300000h
  • Highest du/dt
Filter Capacitors
0.68 µF - 75 µF
230 - 440 VAC
PCM 27.5 - 52.5 mm


MKP 4F MKP 4F
  • Operating temperature up to 105°C
  • Operating life >60000h
  • High AC current capability
Snubber Capacitors
0,01 µF - 8 µF
630 - 4000 VDC
Variable terminations


Snubber MKP
Snubber FKP
Snubber MKP
Snubber FKP
Snubber MKP
Snubber FKP
  • Operating temperature up to 105°C
  • Operating life >300000h
  • Various contact configurations
GTO Capacitors
1µF - 100 µF
400 - 2000 VDC
Axial screw connection


GTO MKP GTO MKP GTO MKP
  • Operating temperature up to 85°C
  • Operating life >300000h
  • Axial screw and thread connection
DC-LINK Capacitors
1 µF - 8250 µF
400 - 1500 VDC
Variable terminations


DC-LINK MKP 4
DC-LINK MKP 6
DC-LINK HC
customized
DC-LINK MKP 4
DC-LINK MKP 6
DC-LINK HC
custumized
DC-LINK MKP 4
DC-LINK MKP 6
DC-LINK HC
customized
  • Operating temperature up to 105°C
  • Operating life >100000h
  • 2-pin, 4-pin, screwable plates or screw connections
SuperCap Modules
customized


PowerBlock (e.g. in photovoltaic systems) PowerBlock (e.g. pitch control in wind turbine systems) PowerBlock for emergency backup systems
  • Operating temperature -40°C to +65°C
  • Operating life >10 years
  • Discharge current up to several 1000A

WIMA SMD capacitors

Fields of Application: Automotive, Power, Medical, Consumer, Telecom/Data
Product Type Application Function Circuit Application Waveform Requirements Special Characteristics
SMD-PET
SMD-PEN
SMD-PPS
Blocking/Coupling

High-pass filter:

– preventing DC voltages
– transferring AC voltages
– High insulation resistance
– Low self-inductance (to observe voltage rating)
  • Operating temperatures up to 125°C (SMD-PET, SMD-PEN) and 140°C (SMD-PPS)
  • Suitable for lead-free soldering at elevated processing temperature Tpeak = 250°C (SMD-PEN, SMD-PPS)
  • Suitable for filtering due to low dissipation factor (SMD-PPS)
Compared to ceramic SMDs (MLCC):
  • No internal cracks or delamination
  • ΔC/C over temperature: very low (SMD-PET, SMD-PEN) or extremely low (SMD-PPS)
  • Self-healing capability -> high withstanding voltage, high reliability
Bypass/Decoupling

Low-pass filter:

– suppressing transmission of high frequencies (AC voltages)
– High insulation resistance
– Low self-inductance
Smoothing
– Smoothing of pulsating DC-voltages from AC-rectifier
– Comparably high capacitance
– Low dissipation factor (to obseve frequency)
SMD-PPS Band-pass filter (e.g. audio, TV)
– pass frequencies within a certain range
– attenuate frequencies outside that range
– Low dissipation factor
– Stable capacitance
Band-stop filter (e.g. audio, TV)
– attenuate frequencies within a specific range
– pass frequencies outside that range
– Low dissipation factor
– Stable capacitance

WIMA film capacitors (PCM 2.5 – 52.5 mm)

Fields of Application: Automotive, Power, Lighting, Medical, Consumer, Telecom/Data, New Energy
Product Type Application Function Circuit Application Waveform Requirements Special Requirements

MKS 02,
MKS 2,

MKS 4,

FKS 2,
FKS 3

MKP 2,
MKP 4
(HF-coupling/ decoupling)
Blocking/Coupling

High-pass filter:

– preventing DC voltages
– transferring AC voltages
– High insulation resistance
– Low self-inductance (to observe voltage rating)
Metallized film capacitors (MK-types):
  • High capacitance values in small box sizes
  • Smallest PCM: 2,5 mm (MKS 02)
  • ΔC/C over temperature: very low (MKS, MKP)
  • Self-healing capability-> high withstanding voltage, high reliability
  • Very low dissipation factor (MKP)
  • High-frequency application (MKP) due to low dissipation factor
  • AEC-Q200 qualified
Film/Foil capacitors (FK-types):
  • High pulse and current rating
  • Smallest PCM: 2.5 mm (FKP 02)
  • ΔC/C over temperature: very low (FKS, FKP)
  • High insulation resiatance (FKS) or very high insulation resistance (FKP)
  • Close tolerances up to 1% (FKP)
  • High-frequency application (FKP) due to very low dissipation factor
  • High reliability
Bypass/Decoupling

Low-pass filter:

– suppressing transmission of high frequencies (AC voltages)
– High insulation resistance
– Low self-inductance

MKS 02,
MKS 2,

MKS 4,
MKP 4

Smoothing
– smoothing of pulsating DC-voltages from AC-rectifier
– Comparably high capacitance
– Low dissipation factor (to observe frequency)

FKP 02,
FKP 2,

FKP 3,

MKP 2,
MKP 4

Band-pass filter (e.g. audio, TV)
– pass frequencies within a certain range
– attenuate frequencies outside that range
– Low dissipation factor
– Stable capacitance
Band-stop filter (e.g. audio, TV)
– attenuate frequencies within a specific range
– pass frequencies outside that range
– Low dissipation factor
– Stable capacitance

FKP 02,
FKP 2,

FKP 3,

MKP 2,
MKP 4

Timing (e.g. signal light)
– when capacitor is charged voltage is increasing over time
– after passing certain value a new state change occurs
– High insulation resistance
– Stable capacitance

FKP 02,
FKP 2,

FKP 3,

MKP 2,
MKP 4
Sample & hold (e.g. amplifier) analogue-digital converter:
– capacitor is used to store analogue voltage value
– electronic switch is used to connect/disconnect capacitor from analogue input (sampling rate)
– Low dielectric absorption
– High insulation resistance
Peak voltage detectors
– diode conducts positive „half cycles“ to charge capacitor to peak voltage
– DC "peak" stored in the capacitor, the diode is blocking current flow
– capacitor retaines the peak value even if the waveform drops to zero
– Low dielectric absorption
– High insulation resistance

WIMA pulse duty capacitors (PCM 7.5 – 52.5 mm)

Fields of Application: Automotive, Power, Lighting, Medical, Consumer, Telecom/Data, New Energy
Product Type Application Function Circuit Application Waveform Requirements Special Characteristics

MKP 10
FKP 4
FKP
1

 

 

Fly-back (e.g. monitors, TV)
– current flows from deflection coil to fly-back capacitor
– electron beam is rapidly shifted from right to left side of screen
– Low dissipation factor
– High pulse rise time
– High dielectric strength
  • Pulse and current rating: high (MKP 10), very high (FKP 4) or extremely high (FKP 1)
  • Self-healing capability -> high withstanding voltage, outstanding reliability
  • Very low dissipation factor
  • High insulation resistance
  • AEC-Q200 qualified
S-correction (smoothing)
– current flows from CL through trafo deflection coils to CS
– CS is smoothing pulsating DC-voltage
– Low dissipation factor
– Good pulse rise time
Energy storage (e.g. ballasts)
– capacitor is charged to a high voltage, stores the energy and then releases it in short time
– High pulse rise time
– High (surge) current carrying capacity
– High insulation resistance
Oscillating circuit Resonant system (LC):
– AC voltage oscillates at resonant frequency
– see also filter applications
– Low dissipation factor
– Stable capacitance (please refer to technical data)
Snubbing (e.g. relay)
– capacitor attenuates over-voltage peaks by high current switching
– Low dissipation factor
– High pulse rise time (please refer to technical data)

WIMA EMI suppression capacitors

Fields of Application: Automotive, Power, Lighting, Medical, Consumer, Telecom/Data, New Energy
Product Type Application Function Circuit Application Waveform Requirements Special Characteristics
MKP-X2
MKP-X1 R
MKP-Y2
EMI suppression
– capacitor suppress high-frequency disturbances of electrical equipment on the mains
– class X capacitors are connected between phase and neutral or phase and phase conductors
– class Y capacitors are connected between phase conductors and earthed casing and thus by-pass oprating insulation
– High degree of interference suppression and low ESR
  • High degree of interference suppression due to good attenuation and low ESR
  • High volume/capacitance ratio
  • AEC-Q200 qualified

MKP-X2
MKP-X2 R
(MKP -X1 R)

Voltage dropper
– capacitor voltage divider
– High capacitance stability
– Flame retardant (please check if approvals are required)

Filter capacitors

Fields of Application: Automotive, Power, Medical, New Energy
Product Type Application Function Circuit Application Waveform Requirements Special Characteristics

MKP 4F

Voltage Dropper
– capacitor voltage divider
– High capacitance stability
– Flame retardant (please check if approvals are required)
  • Operating temperature up to 105° C
  • High capacitance/volume ratio
  • Up to 440 VAC
  • AEC-Q200 qualified

WIMA Snubber capacitors

Fields of Application: Automotive, Power, Medical, Consumer, New Energy
Product Type Application Function Circuit Application Waveform Requirements SpecialCharacteristics

Snubber MKP
Snubber FKP

 

Energy storage
– capacitor is charged to high voltage, stores the energy and releases it in short time
– High pulse rise time
– High (surge) current carrying capability
– High insulation resistance
  • Pulse and current rating : high (Snubber MKP) or very high (Snubber FKP)
  • High volume/capacitance ratio (Snubber MKP)
  • Self-healing capability -> high withstanding voltage, outstanding reliability
  • Very low dissipation factor
  • High insulation resistance
  • Low self-inductance
  • Particularly reliable contact configurations: 2-pin, 4-pin or screwable plates connection
  • AEC-Q200 qualified
Snubbing (e.g. IGBT)
– capacitor attenuates over-voltage peaks by high current switching
– Low dissipation factor
– High pulse rise time (please refer to technical data)
– Low self-inductance

WIMA GTO capacitors

Fields of Application: Power, New Energy
WIMA products Application Function Circuit Application Waveform Requirements Special Characteristics

GTO MKP

 

Energy storage
– capacitor is charged to high voltage, stores the energy and releases it in short time
– High pulse rise time
– High (surge) current carrying capability
– High insulation resistance
  • Very high pulse and current rating
  • Self-healing capability -> high withstanding voltage, outstanding reliability
  • Very low dissipation factor
  • High insulation resistance
  • Low self-inductance
  • High mechanical stability
  • High shock and vibration resistance
Snubbing (e.g. GTO-thyristor)
– capacitor attenuates over-voltage peaks by high current switching
– Low dissipation factor
– High pulse rise time (please refer to technical data)
– Low self-inductance

WIMA DC-LINK capacitors

Fields of Application: Automotive, Medical, Power, New Energy
Produc Type Application Function Requirements Special Characteristics

DC-LINK MKP 4
DC-LINK MKP 6
DC-LINK HC
Customized

Energy buffer e.g. in:
  • Frequency converter
  • Power Supplies
  • Solar Inverter
  • E-Mobility (Battery Chargers, Motor Drives & Power Train)
  • etc.
- capacitor stores DC-voltage in an intermediate circuit
- high frequency ripple voltage generated by inverter is short-circuited

 

- High volume/ capacitance ratio
- High DC-voltage strength
- Low dissipation factor
  • Volume/capacitance ratio: high (DC-LINK MKP 4) or very high (DC-LINK MKP 6 or DC-LINK HC)
  • High mechanical stability
  • Particularly reliable contact configurations: 2-pin, 4-pin, screwable plate or screw connections (male or female)
  • AEC-Q200 qualified
  • (DC-LINK MKP 4)
Advantages compared to aluminium electrolytic capacitors:
  • Low self-inductance
  • High ripple current capability
  • High voltage/over-voltage strength by specific metallization
  • Excellent self-healing properties
  • Very constant ΔC/C
  • Very low dissipation factor and ESR
  • Dry construction without electrolyte -> high reliability
  • Non polar construction
  • High insulation resistance
Circuit application

WIMA PowerBlocks

Fields of Application: Automotive (Passenger Cars, Trucks, Busses, Military Vehicles, and Forklifts)
Application Function Figure Requirements Special Characteristics
Recuperation of Braking Energy/Power Boost
- PowerBlock unit stores energy generatad by braking and releases it within short time for acceleration

Peak-Load Levelling
- PowerBlock unit supports battery by covering power-peaks

Local Power Supply
- PowerBlock unit supplies local electric system which need peak-power within short time

Boardnet Stabilisation
- Safety backup for security relevant on-board electronic systems
Combination with Batteries in Hybrid and Electric Cars

- Engine starting - Electronic stability control - Electric water pump
- Start-stop - Electric brakes - Audio system
- Electric heating
- 4-wheel steering
- Door close/ lock
- Electric steering
- Electric fan
   

- Low fuel consumtion
- Low CO2 emission
- High dynamic
- Low weight of battery
- High efficiency
- Long life-time of battery
- High reliability of on-board electronics
  • Fast supply of several 100A up to 3000A in direct current operation
  • Operating stemperature range from -40°C to +65°C
  • Many years of maintenance-free operation with clearly more than 1 mio. charge/discharge cycles
  • Life expectancy >10 years
  • Significant lower weight as against batteries or secondary batteries
  • Environmentally friendly materials
Cranking of Engines
- PowerBlock unit supplies peak-power within a short time to crank an engine
- After cranking the engine the PowerBlock unit gets charged immediatly
Replacement of Starter Batteries

- Power supply under extreme weather conditions (-40°C)
- Long de-energized periods (vintage cars)
- Maintenance-free
Fields of Application: Transportation (Trains, Tram, Subway )
Application Function Figure Requirements Special Charecteristics
Recuperation of Braking Energy/Power Boost
- PowerBlock unit stores energy generatad by braking and releases it within short time for acceleration

Peak-Load Levelling
- PowerBlock unit supports battery by covering power-peaks

Short-Term Energy Storage
- Network support in local traffic systems by energy storage
"Rolling Stock"
 
 
- Integrated heat sink
- Saving of approx. 30% of energy by recuperation
- Efficiency >95%
- Energy saving
- High dynamic
- High efficiency
- Peak-power supply
- Reduction of over-head contact lines in historic cities
  • Fast supply of several 100A to 3000A in direct current operation
  • Operating temperature range from -40°C to +65°C
  • Many years of maintenance-free operation with clearly more than 1 mio. charge/discharge cycles
  • Life expectancy >10 years
  • Significant lower weight as against batteries or secondary batteries
  • Environmentally friendly materials
Motor Start
- PowerBlock unit supplies peak-power within a short time to crank an engine
Replacement of Starter Batteries
(e.g. in diesel-electric engines)



Saving:
- approx. 90% of weight
- approx. 25% of fuel
- Power supply under extreme weather conditions (-40°C)
- Low weight
- Low fuel consumption
- Maintenance-free
Fields of Application: Power Supply (UPS); Telecommunication/Data Processing (Memory Backup)
Application Function Figure Requirements Special Characteristics
UPS
- Short-term power supply when mains power failure

Peak-Load Levelling
- Coverage of power peaks
UPS-Emergency Backup in Hospitals, Telecommunication Systems, Oil and Gas Extraction (cost-intensive processes)

- Micro-turbine short bridging
- Emergency backup to avoid downtime after short blackout
- Peak-power supply
- Long life-time
- Maintenance-free
  • Fast supply of several 100A to 3000A in direct current operation
  • Operating temperature range from -40°C to +65°C
  • Many years of maintenance-free operation with clearly more than 1 mio. charge/discharge cycles
  • Life expectancy >10 years
  • Significant lower weight as against batteries or secondary batteries
  • Environmentally friendly materials
Short-Term Energy Storage
- PowerBlock unit stores energy for a short time e.g. after voltage drop
Memory Backup - On-Board Logic

- Transferring data from DDR memory to flasch card

Memory Backup - Time Switch

- Protection of clock information after voltage drop
- Memory backup for seconds/ minutes
- Low weight
- Maintenance-free
Fields of Application: New Energy (Wind, Solar Systems)
Application Function Figure Requirements Special Characteristics
Power Supply
- PowerBlock unit supplies local electric systems which need power within short time
Pitch Drive of Windmills

- Continuous adjustment of rotor blade angle
- Pitch control functionally independent of line voltage
- Emergency stop at blackout
- Power supply under extreme weather conditions (-40°C)
- Emergency switch-off system
- Life-time for >10 years
- Low weight
- Maintenance-free
  • Fast supply of several 100A to 3000A in direct current operation
  • Operating temperature range from -40°C to +65°C
  • Many years of maintenance-free operation with clearly more than 1 mio. charge/discharge cycles
  • Life expectancy >10 years
  • Significant lower weight as against batteries or secondary batteries
  • Environmentally friendly materials
Short-Term Energy Storage
- Intermediate storage of peak-voltage to provide continued power
Short-Term Energy Buffer in Solar Systems



- Power supply under extreme weather conditions (-40°C)
- Emergency switch-off system
- Life-time for >10 years
- Low weight
- Maintenance-free

 

WIMA environmental policy

As a medium-sized employer in the technical field, WIMA is aware of its social and ethical responsibility. The WIMA Group is concerned about environmental protection, which is why we attach great importance to minimising environmental risks and negative effects on the environment by taking precautionary measures. These include in particular:

  • Reduction of energy consumption and greenhouse gas emissions,
  • Maintenance of clean air and increase of air quality,
  • Management of natural resources,
  • Avoidance of waste,
  • Preservation of water quality and economical use of water,
  • A responsible chemical management.
WIMA capacitors are manufactured on state-of-the-art production lines that meet the high standards of today’s environmental requirements, including energy and raw material consumption. Based on the state-of-the-art analytical technology and the information provided by our suppliers, we can confirm that WIMA products and production processes are free of environmentally harmful substances or that their low concentration does not require verification and is therefore not subject to the lists of banned or phased out substances.

This refers to the entire WIMA product range, i. e.

  • Film capacitors for SMT and THT,
  • Plastic Film Snubber Capacitors and DC-Link Capacitors,
  • Metallized paper capacitors (WIMA MP radio interference suppression capacitors),
  • Double-layer capacitor modules (WIMA PowerBlock).

All WIMA capacitors are made of environmentally friendly materials. Neither during manufacture nor in the product itself any toxic substances are used, e.g.

  • Lead (Pb),
  • PBB / PBDE,
  • PCB,
  • Arsenic (As),
  • CFC,
  • Cadmium (Cd),
  • Hydrocarbon chlorid
  • Mercury (Hg),
  • Chromium (Cr6+),
  • Asbestos,
  • etc.

We merely use pure, recyclable materials for packing our components, such as:

  • carton
  • cardboard
  • adhesive tape made of paper
  • polystyrene
We almost completely refrain from using packing materials such as:

  • foamed polystyrene (Styropor®)
  • adhesive tapes made of plastic
  • metal clips

All capacitor series of the WIMA product range are fully RoHS compliant according to the latest version of the EU RoHS Directive 2011/65/EU (RoHS 2, including the amendment according to Annex II of 31 March 2015).

The REACH Declaration of Conformity is based on the latest information from our semi-finished product suppliers and takes into account the latest updated SVHC candidate list. This D of C refers to capacitors of the entire WIMA product range.

Self-healing process in metallized capacitors

Even the best plastic films, like ceramic materials, are not free from pin-holes. However, in the case of metallized film capacitors it is possible to eliminate these faults by applying a much higher voltage than the rated voltage. This process is known as self-healing and practically makes a "zero defect dielectric" possible.

break2Figure 1: Schematic representation of the self-healing process

break1Figure 2: Isolated area after the self-healing process

The self-healing process is started by an electric breakdown, which takes about 10-8 secs. In the breakdown channel, the dielectric is transformed into a highly compressed plasma which is pushed out of the channel and presses the dielectric layers apart (figure 1).

In the spreading plasma, discharging continues over the metal electrodes. Temperatures of approximately 6000 K occur and insulated areas are formed around the original failure spot (figure 2). This self-healing process takes a few µsec and the discharging in the plasma has already ceased before a greater loss of voltage takes place. This quick extinction of the plasma is necessary to avoid further damage to the dielectric layer next to the point of failure.
The pressure between the layers must not be too great, so that the plasma can spread out from the breakdown channel quickly. Large parts of the plasma get into areas of low field strength.

The flawless course of the self-healing process depends on the thickness of the metallization, on the chemical composition and on the rate of the applied voltage; here, apart from the chemical composition, the production conditions have to provide the prerequisites for optimum self-healing.

About us

As the world's leading manufacturer, we develop and manufacture high-quality film capacitors for professional use in all areas of electronics.

As privately owned company since 1948 we are producing exclusively in Germany. As specialist in film capacitors our goal is to achieve customer satisfaction in terms of quality, innovation and service.

Our strength lies in the production and design not only of standard but also of customized products requiring experience and highly developed expertise. Solutions can therefore be offered to all customer needs.

Contact

WIMA GmbH & Co. KG
Besselstr. 2 – 4
68219 Mannheim

Phone: +49 621 86295-0
Fax: +49 621 86295-48

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