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Advance Capacitors Selection Guide
 
 
ADVANCE offers a full range of Plastic Film capacitors in Polyester, Polycarbonate and Polypropylene Dielectrics. These are available in varying case styles such Axial, Radial, Plastic or Aluminium Cans or special Modules. They are available in full voltage range, different current and pulse ratings.
 
Metallised Polyester Capacitors, Axial and Radial
Metallised Polycarbonate Capacitors, Axial and Radial
Metallised Polypropylene Capacitors, Axial and Radial
Interference Suppression Capacitors - IEC 384-14, X and Y type
High dv/dt Snubber Capacitors
High Current Feedthrough Capacitors upto 400 Amps
Polypropylene AC Capacitors
Induction Heating Capacitors
RFI Noise Filters upto 200 Amps
Broad Band EMI Noise Filters (Feed through PI section) upto 200 Amps
   
   
  Metallised Polyester Capacitors (Specifications)
   
 
Type Style Capacitance Range Voltage Range Group
MWF Axial Round 0.0022 to 10.0 µf ± 5% and 10% 63-630 Vdc Moderate cost, General use
MWF Axial Round 0.001 to 10.0 µf ± 5% 10% 63-1000 VDC 35-300 VAC General use, Moderate cost
MWOF Axial Oval 0..47 to 10.0 µf ± 5% 10% 100-1000 VDC Reduced Height on PCB
MF Radial 0.001 to 10.0 µf ±5% 10% 63-1000 VDC 10.2 to 27.5 pitch
MMF Radial 0.001-0.47 µf ±5% 10% 100-630 VDC Miniature 7.5mm pitch
   
   
  Metallised Polycarbonate Capacitors (Specifications)
   
 
Type Style Capacitance Range Voltage Range Group
CMWF Axial Round 0.0022 to 10.0 µf ± 1 % 5% and 10% 63-630 Vdc Close tolerance, Higher cost
CMWOF Axial Oval 0.47 to 10.0 µf ± 1% 5% and 10% 63-630 Vdc Higher temperature class, Low ppm
CMF Radial 0.0022 to 10.0 µf ±1% 5% and 10% 63-630Vdc 10.2 to 27.5 pitch
   
   
  Metallised Polypropylene Capacitors (Specifications)
   
 
Type Style Capacitance Range Voltage Range Group
DC Voltages        
Type-PMWF Axial Round 0.0022 to 10.0 µf ± 1 % 5% and 10% 100-630Vdc Close tolerance, Moderate cost
Type-PMF Radial 0.0022 to 10.0 µf ±1% 5% and 10% 63-630Vdc 100 deg C max, Negative ppm
AC Voltages        
Type-MPP Axial/Radial   250/300 Vac 400/440Vac Across the line applications
Type-MKP4 Radial   -do-  
Type-MKP5 Axial   -do-  
Type-MKP6 Radial   -do- Double Metallised
Type-MKP7 Axial   -do- Double Metallised
   
   
  Interference Suppression - X and Y Class
   
 
Type Style Capacitance Range Voltage Range Group
PWX Axial Round 0.01-2.2 µf ±10% 250-440 Vac RFI Filters
PMX Radial 0.01-1.0 µf ±10% 250-440 Vac Noise suppression, X2 class
PMY Radial 0.001-0.01 µf ±10% 250 Vac Noise suppression, Y2 class
   
   
  Dielectric Selection:
   
  Based on the circuit requirements, collect information on as many of the following parameters as possible.
   
 
1. Circuit Application, polar or non-polar
2. Capacitance value (mfd) , capacitance tolerance, capacitance voltage ( DC and AC ), ripple voltage
3. Pulse or commutation application - voltage & current waveform
4. Operating temperature range, variation of capacitance permitted over this range
5. Permissible Tan Delta ( also called dissipation factor or power factor )
6. Leakage Current or Insulation Resistance.
7. Capacitance life, stability and other environmental requirements
   
 
Using the Capacitor Dielectric selection guide & Application guide , select the capacitor type most suitable for the application.
Study the charts for temperature v/s capacitance, tan delta,to help narrow the choice to your circuit's needs.
Consider details such as RMS current, pulse rating, ripple current, package, mounting, connectors.
   
 

 

Plastic Film Capacitors employ a thin film- polystyrene, polyester, polycarbonate, polypropylene as the dielectric. Both film and foil and metallised film constructions are used. In a film and foil capacitor, plastic film is interleaved with aluminium foil. Metallised film versions are made by vacuum depositing a thin metal film on the plastic film. The thin metal results in both high volumetric efficiency and self healing. In metallised plastic units an arc can rapidly vaporize the thin metal in the immediate vicinity of the breakdown point and clear the short. The arc then extinguishes, and the capacitor becomes open circuited again or self healed. Plastic film capacitors are non-polar and excellent for AC application. They have high insulation resistance, low DF and have replaced paper capacitors in most applications.They have a higher volumetric efficiency than paper, mica or ceramic units.

 

 

Film/foil capacitors are generally bigger in size compared to metallised versions, but have a higher current and pulse ratings. Their failure mode is short circuit and not to be used in across the line applications.

 

 

Metallised film capacitors are smaller in size compared to film/foil versions, but have lower pulse rating. The failure mode is open circuit. There are various special constructions combining the higher pulse ratings of foil types and self healing properties of metallised capacitors. These are double metallised, series, and series

metallised / foil constructions.

 

 

Polyester (mylar) capacitors are very popular, because they are inexpensive. Even though most of their characteristics are very good, capacitance varies drastically with temperature about as badly as aluminium electrolytes.

 

 

Polycarbonate capacitors have a higher temperature range up to 125 degree C, low tan delta and a very low change of capacitance with temperature.

 

 

Polyphenylene Sulphide (PPS) capacitors have a higher temperature range upto 150 degree C, low tan delta and a very low change of capacitance with temperature and presently being offered as replacement for polycarbonate capacitors

 

 

Polypropylene capacitors also have a very low tan delta and a good stability but lower operating temperature range upto 100 degree C and are ideal for AC applications, high current and high dv/dt applications.

 

 

Aluminium Electrolytics are widely used because of their low cost and high Capacitance X voltage (CV) product for a given physical volume. Electrolytics are highly sensitive to temperature, and have a limited operations and shelf life. With time, the Dissipation Factor can rise as much as 50% and the capacitance can drop substantially-to 10% rated.

 

 

Tantalum Electrolytics have a higher CV product per unit volume than the aluminum electrolytics, are more temperature-stable, and usually have hermetic seals to eliminate humidity effects. Both their shelf and operating lives are superior to aluminium electrolytics. But tantalum capacitors are several times more expensive than aluminium electrolytics. Tantalum capacitors can be obtained as either polar or non-polar types.

 

 

Mica Capacitors use the natural mineral Mica as a dielectric. They are very reliable and stable and particularly good for high frequency work. Mica, a very stable material provides high Q, but capacitance values generally do not go above 0.1 mfd because the units become bulky and expensive.

 

 

Ceramic capacitors can be used at high frequencies to 1000 MHz but do not have Micas stability or Q. They are used in bypass circuits, decoupling and EMI/RFI filters.

   
  Dielectric Selection Guide:
   
 
Application Polyester Polycarbonate Polypropylene Range Tantalum Al Electrolytic Mica Ceramic
Cap Range Axial Round 0.01 to 15 0.01 to 100 0.1 to 5000 0.5 to 100,000 10pf to 0.1 0.001 to 1
DC Volts upto Radial 1000 1500 300 700 5000 4000
AC Volts upto Radial 350 500   250 (inter) N/A 400
Tolerance
10 10 10 20 50 5 20
Standard Minimum 1 1 1 5 20 1 5
IR min Megohms 10,000 20,000 30,000     100,000 100,000
TanDelta@1KHz 0.006 0.003 0.0005     0.02 0.02
Stabilty Moderate Good Good Moderate Poor Excellent Moderate
Cost/ CV Moderate High Modearte High Low High Low
Temp Coeff - - - - - - -
   
  Note: All values are indicative only and may change from manufacturer to manufaturer. Refer to individual catalogues for specific values.
   
  Application Guide
   
 
Application Polyester Polycarbonate Polypropylene Range Tantalum Al Electrolytic Mica Ceramic
Blocking DC Yes Yes Yes Yes Yes Yes Yes
Bypass Yes Yes Yes Yes Yes Yes Yes
Commutation Rarely Yes Yes     Yes Yes
Coupling Yes Yes Yes        
Tuning   Yes Yes     Yes  
Power Factor Low Voltage   Yes        
Energy Storage   Rare Yes        
Timing   Yes Yes     Yes  
dv/dt snubber     Yes        
Interference Suppression Yes   Yes       Yes
   
  Note: All values are indicative only and may change from manufacturer to manufacturer. Refer to individual catalogues for specific values.
   
 
 
 
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