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Electronics Film Capacitors


Film capacitors are designed with two electrode pins and a thin plastic film dielectric that is either untreated or metallicized, depending on the intended application. Untreated film capacitors use two pieces of paper film as a dielectric that are then layered with aluminum foil to form the electrodes. They provide easy electrical connection and can handle high current surges.

Metallicized film capacitors use two pieces of metallicized film as the dielectric and are coated with a thin layer of aluminum metallization on one of both sides to form an electrode. This type of film dielectric capacitor is described as being “self-healing” and can handle short circuits between the electrodes without causing destruction of the film capacitor.
Polymer film capacitors can be mounted individually or stacked together and are one of the most common types of capacitors used in electronic equipment. Their design allows for direct contact to electrodes, which helps keep current paths short. The electrodes on film capacitors can also be interchanged, which makes them more versatile than other types of capacitors. Polymer film capacitors are non-polarized, provide low ESR and can also withstand high voltages. Their low cost, stability and low inductance make them suitable for a wide range of AC and DC microelectronic applications.
PUI provides film dielectric capacitors in polyester film and polymer film options and in styles including:
  • Radial leaded box type: through-hole mounting on PCB
  • Axial leaded: point-to-point or through-hole mounting options

Choosing Between Film Capacitors vs. Ceramic Capacitors

Film capacitors use polyester, polypropylene, polyphenylene, polycarbonate as a dielectric, where ceramic capacitors use ceramic material as the dielectric. Their similarities are that they are both nonpolarized and can handle high operating temperatures, but they are designed for different uses. The primary difference is that polymer film capacitors do not pick up ambient sound, where ceramic capacitors have a tendency to pick up ambient sound.
Film capacitors:
  • Ideal for analog signaling applications
  • Provides linear voltage responses
  • Have a low average failure rate
  • Retain values longer than other capacitors
  • Are nonpolarized
Ceramic capacitors:
  • Ideal for audio applications
  • Provide non-linear frequency and voltage responses
  • Are microphonic and can pick up ambient sound
  • Feature larger capacitor values
  • Are nonpolarized
  • More stable

Film Dielectric Capacitors High Temperature and High Voltage Applications

PUI provides film capacitors constructed of low-loss polypropylene film and providing exceptionally low ESR, high ripple current capabilities and high capacitance values. These polymer film capacitors feature a dry construction, are non-polarized and provide improved reliability.
Additional features include:
  • Operating temperature: up to 105°C
  • Capacitance range: 4.7 to 100 µF
  • Capacitance tolerance: ±10% (K) standard
  • Rated voltage: 400 to 1500 Vdc
  • Life expectancy: 60,000 h @ 70 ºC, rated voltage
  • RoHS compliant

Request a Quote for Film Dielectric Capacitors

PUI offers a range of audio solutions including electronics film capacitors, aluminum capacitors and ceramic capacitors. Request a quote today or contact us to request additional information.
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