Film Capacitors

Part Number	Description / PDF	Quantity
890324026024 Würth Elektronik Midcom	CAP FILM 0.82UF 10% 275VAC RAD	200
890334026018CS Würth Elektronik Midcom	CAP FILM 0.56UF 10% 310VAC RAD	191
890324027012 Würth Elektronik Midcom	CAP FILM 1.2UF 10% 275VAC RADIAL	55
890273427005CS Würth Elektronik Midcom	CAP FILM 4.7UF 10% 250VDC RADIAL	0
890324025004 Würth Elektronik Midcom	CAP FILM 0.027UF 10% 275VAC RAD	0
890324024005CS Würth Elektronik Midcom	CAP FILM 0.47UF 10% 275VAC RAD	1407
890334022017 Würth Elektronik Midcom	CAP FILM 0.068UF 10% 310VAC RAD	0
890283425002CS Würth Elektronik Midcom	CAP FILM 0.22UF 10% 400VDC RAD	0
890273425001CS Würth Elektronik Midcom	CAP FILM 0.33UF 10% 250VDC RAD	0
890283327008CS Würth Elektronik Midcom	CAP FILM 2.2UF 5% 400VDC RAD	0
890334025034CS Würth Elektronik Midcom	CAP FILM 0.33UF 10% 310VAC RAD	1010
890283422001CS Würth Elektronik Midcom	CAP FILM 0.068UF 10% 400VDC RAD	0
890334025039CS Würth Elektronik Midcom	CAP FILM 0.47UF 10% 310VAC RAD	6771
890334023028 Würth Elektronik Midcom	CAP FILM 0.22UF 10% 310VAC RAD	13235
890324025015 Würth Elektronik Midcom	CAP FILM 0.082UF 10% 275VAC RAD	0
890273326003CS Würth Elektronik Midcom	CAP FILM 0.68UF 5% 250VDC RAD	0
890303428008CS Würth Elektronik Midcom	CAP FILM 3.3UF 10% 630VDC RADIAL	41
890334025034 Würth Elektronik Midcom	CAP FILM 0.33UF 10% 310VAC RAD	500
890324025011CS Würth Elektronik Midcom	CAP FILM 0.056UF 10% 275VAC RAD	0
890334025025 Würth Elektronik Midcom	CAP FILM 0.18UF 10% 310VAC RAD	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.