Plastic Film Capacitor Data

- Value Change Over Temperature-

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Value x Temperature

The graph above shows the change in Capacitance value vs Temperature change for a number of different plastic film capacitor dielectric types. This is not the same as the tolerance listed on the capacitor. The tolerance value marked on the device indicates what the expected value should be at room temperature. Derating guide lines for capacitors is listed on the Component De-Rating page.

Dielectric Types

• PAPER Dielectric Capacitors are used in High voltage applications. Paper devices should not be used in a high moisture environment unless the device is in a hermetic case, the capacitance will increase, the power factor - insulation resistance - dielectric strength - and life will degrade. Paper capacitors have near 10% tolerances.
• Plastic FILM
  • Mylar: has a wide temperature change of 20% over -55 to +125C. Moisture absorption is half that of paper. Mylar is the same as polyester. The term Mylar is a trade name.
  • Polycarbonate: Out performs Mylar in all areas. Low Power factor, works best with AC. Polycarbonate has a low temperature drift (graph below), dissipation factor, and dielectric absorption. Use polyphenylene sulfide as a possible replacement.
  • Polyester: Replaces paper for many applications, and smaller in size. Polyester does not have the moisture problem that paper does, but does have a worse tolerance, at 20% ~ over -55 to +125C. May also be called PETE, or PETP. The Polyester Dielectric has an Absorption of around 0.20%.
  • Polypropylene: It has negative temperature coefficient.
  • Polysulfone: Has a very high operating temperature of +170C.
  • Polystyrene: Will only work to +65C. It has a flat to negative temperature coefficient.
  • Teflon: Has a very high operating temperature of +170C.
• MICA High Precession. The material is inert it will not change over time or temperature.
• CERAMIC
  The standard By-pass capacitor resides with in two main classes, Type I and II; However the major distinction resides with the temperature and frequency characteristics. Normally the frequency characteristics come first and then the temperature {It depends on the design application}.
  • NPO (Type I) Stable over temperature [[CGO] EIA temperature Coefficient Designation]
  • X7R (Type II) 15% variation over temperature
  • Z5U General Purpose [EIA temperature characteristic code]
  • Y5V General Purpose [EIA temperature characteristic code]

Engineering Key Words: Capacitor, Value, Change, Temperature, Maximum Operational Range, Dielectric.
What is the change of capacitance over temperature for Plastic Film Dielectric.
What are the different types of capacitor Dielectric material. What are the different EIA codes for Temperature Characteristics.

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