Film Capacitors

Image	Part Number	Description / PDF	Quantity	Rfq
	35ST684M3216X Rubycon	CAP FILM 0.68UF 20% 35VDC 1206	0
	16ST475K4532-ND Rubycon	CAP FILM 4.7UF 10% 16VDC 1812	0
	25ST105K3216-ND Rubycon	CAP FILM 1UF 10% 25VDC 1206	0
	50ST684M3225X Rubycon	CAP FILM 0.68UF 20% 50VDC 1210	0
	25ST225M3225X Rubycon	CAP FILM 2.2UF 20% 25VDC 1210	0
	16ST1.5M3216-ND Rubycon	CAP FILM 1.5UF 20% 16VDC 1206	0
	25ST684M3216 Rubycon	CAP FILM 0.68UF 20% 25VDC 1206	0
	63ST334M3225 Rubycon	CAP FILM 0.33UF 20% 63VDC 1210	0
	50ST335M5750 Rubycon	CAP FILM 3.3UF 20% 50VDC 2220	0
	63ST155M4532 Rubycon	CAP FILM 1.5UF 20% 63VDC 1812	0
	25ST225M3225 Rubycon	CAP FILM 2.2UF 20% 25VDC 1210	0
	35ST685M5750X Rubycon	CAP FILM 6.8UF 20% 35VDC 2220	0
	63ST684M4532X Rubycon	CAP FILM 0.68UF 20% 63VDC 1812	0
	35ST225M4532X Rubycon	CAP FILM 2.2UF 20% 35VDC 1812	0
	35ST474M3216X Rubycon	CAP FILM 0.47UF 20% 35VDC 1206	0
	50ST224M3216 Rubycon	CAP FILM 0.22UF 20% 50VDC 1206	0
	25ST335M4532 Rubycon	CAP FILM 3.3UF 20% 25VDC 1812	0
	100ST683M3225 Rubycon	CAP FILM 0.068UF 20% 100VDC 1210	0
	16ST335M3225 Rubycon	CAP FILM 3.3UF 20% 16VDC 1210	0
	16ST226K5750X Rubycon	CAP FILM 22UF 10% 16VDC 2220	0

Film Capacitors

1. Overview

Film capacitors are a type of electronic component using plastic films (e.g., polypropylene, polyester) as dielectric materials. They are non-polarized capacitors with high insulation resistance, low loss, and excellent long-term stability. These capacitors play critical roles in power electronics, automotive systems, renewable energy, and consumer devices due to their reliability and high voltage-handling capabilities.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Polyester (PET)	Low cost, compact size, moderate temperature stability	General-purpose circuits, consumer electronics
Polypropylene (PP)	High voltage resistance, low dielectric loss, excellent thermal stability	Power supplies, motor drives, EV charging systems
Polycarbonate (PC)	High precision, low moisture absorption	Medical devices, aerospace instrumentation
Polyphenylene Sulfide (PPS)	High-temperature endurance, flame retardant	Automotive electronics, industrial automation
Polyimide (PI)	Ultra-high temperature resistance (up to 200 C), compact design	Aviation systems, downhole drilling equipment

3. Structure and Composition

Film capacitors typically consist of metalized plastic films wound or stacked into a cylindrical/rectangular core. The dielectric thickness ranges from 1-10 m, with electrode materials like zinc or aluminum. The assembly is encapsulated in epoxy resin or plastic housings. Key structural elements include:

Dielectric layer (plastic film)
Metallized electrode patterns
Termination electrodes (sprayed metal contacts)
Protective outer coating

4. Key Technical Parameters

Parameter	Description	Importance
Capacitance Range	0.1 nF - 100 F	Determines energy storage capacity
Rated Voltage	50 V - 10 kV	Defines operational safety limits
Capacitance Tolerance	1% to 20%	Affects circuit precision
Dissipation Factor	0.0001 - 0.05	Indicates energy efficiency
Insulation Resistance	10^9 - 10^12	Reflects leakage current performance
Operating Temperature	-55 C to +155 C	Dictates environmental adaptability
Temperature Coefficient	50 to 400 ppm/ C	Impacts stability under thermal stress
Stability	C/C < 2% over 10 years	Long-term reliability indicator

5. Application Fields

Main industries and equipment:

Power electronics: AC/DC converters, frequency inverters
Automotive: Electric vehicle (EV) on-board chargers, battery management systems
Consumer electronics: LED lighting, plasma TVs
Industrial: Uninterruptible power supplies (UPS), welding machines
Renewable energy: Solar inverters, wind turbine converters

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
TDK Corporation	B32656 series	PP film, 480 F/1200 V for industrial inverters
KEMET	C4AZ-X7R4U3D106KE	Automotive-grade DC link capacitor
AVX	6TP105K	Tantalum polymer hybrid for aerospace
Vishay	MKP1848 series	Self-healing PP technology

7. Selection Guidelines

Key considerations:

Determine required capacitance and voltage ratings with safety margins
Assess environmental conditions (temperature, humidity, vibration)
Evaluate dielectric absorption and frequency response requirements
Consider packaging constraints (through-hole vs. surface-mount)
Analyze cost-performance trade-offs for mass production

8. Industry Trends

Emerging trends include: development of high-power-density capacitors for EVs, adoption of nanodielectric materials for improved thermal stability, growth of biodegradable film technologies, and integration of smart monitoring features in industrial capacitors. The market is projected to grow at 7.2% CAGR (2023-2030), driven by renewable energy and 5G infrastructure demands.