Editorial Technical Reference

Film Capacitor

This page explains how Film Capacitor is classified within Computer, Electronic and Optical Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A film capacitor is a passive electronic component that stores electrical energy in an electrostatic field, using a thin plastic film as the dielectric.

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Product Specifications

Technical details and manufacturing context for Film Capacitor

Definition

Film capacitors are widely used in power electronics, audio circuits, motor drives, and power supplies for filtering, decoupling, and energy storage. They are specified by capacitance value, voltage rating, tolerance, and temperature coefficient. Grades are distinguished by dielectric material (e.g., polypropylene, polyester), film thickness, metallization quality, and construction (wound or stacked). High-grade film capacitors offer low loss, high stability, and long life.

Working Principle

A film capacitor consists of two conductive electrodes (usually metallized film) separated by a thin plastic film dielectric. When a voltage is applied, an electric field polarizes the dielectric, storing energy. The capacitance is determined by the electrode area, dielectric thickness, and dielectric constant. The film's low dielectric absorption and high insulation resistance make it ideal for high-frequency and high-voltage applications.

Common Materials

Polypropylene (PP) film, Polyester (PET) film, Polyphenylene sulfide (PPS) film, Metallized zinc-aluminum alloy (for electrodes), Aluminum foil (for foil-type electrodes)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Capacitance Range	0.001–1000 µF µF	Typical range for film capacitorsIEC 60384-16
Rated Voltage	50–2000 V V	DC or AC voltage ratingIEC 60384-16
Capacitance Tolerance	±1% to ±10% %	Common tolerancesIEC 60384-16
Dissipation Factor (tan δ)	≤0.001 at 1 kHz dimensionless	For polypropylene filmIEC 60384-16
Insulation Resistance	≥100,000 MΩ MΩ	At 25°C, 100 VDCIEC 60384-16
Temperature Range	-40 to +105 °C	Operating temperature rangeIEC 60384-16
Dielectric Strength	≥1.4× rated voltage V/µm	Test voltage for 1 minuteIEC 60384-16
Capacitance Drift	≤0.5% after 1000 h %	At rated voltage and 85°CIEC 60384-16
Self-Inductance	≤10 nH nH	For low-inductance types
ESR (Equivalent Series Resistance)	≤5 mΩ at 100 kHz mΩ	For high-frequency types
Ripple Current Capability	1–50 A A	Depends on size and cooling
Lead Spacing	5–37.5 mm mm	Standard pitch for radial typesIEC 60384-16
Case Dimensions	5×10×12 to 40×60×80 mm	W×H×L typical
Humidity Resistance	85°C/85% RH, 500 h condition	Test conditionIEC 60384-16

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Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Film Capacitor.

Published Manufacturer Relationships

Source-reviewed profile relationships currently associated with Film Capacitor

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Data Basis

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Preliminary Technical Classification

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