Film Capacitors

Part Number	Description / PDF	Quantity
ECH-U1H331GX5 Panasonic	CAP FILM 330PF 2% 50VDC 0805	2399
ECW-FD2W474K4 Panasonic	CAP FILM 0.47UF 10% 450VDC RAD	81
ECQ-E2275RKB Panasonic	CAP FILM 2.7UF 10% 250VDC RADIAL	0
ECW-FG80755J Panasonic	CAP FILM 7.5UF 800VDC RADIAL	20
ECQ-UBAF103M Panasonic	CAP FILM 0.01UF 20% 300VAC RADIA	0
ECW-F4824JB Panasonic	CAP FILM 0.82UF 5% 400VDC RADIAL	48
ECQ-E2105KB Panasonic	CAP FILM 1UF 10% 250VDC RADIAL	28584
ECQ-E2335JB Panasonic	CAP FILM 3.3UF 5% 250VDC RADIAL	775
ECH-U1H102GX5 Panasonic	CAP FILM 1000PF 2% 50VDC 0805	9892
ECW-U2102KC9 Panasonic	CAP FILM 1000PF 10% 250VDC 1913	6175
EZP-E80256MTA Panasonic	CAP FILM 25UF 10% 800VDC RADIAL	41
ECQ-E4184KFB Panasonic	CAP FILM 0.18UF 10% 400VDC RAD	0
ECW-F2155HA Panasonic	CAP FILM 1.5UF 3% 250VDC RADIAL	0
ECQ-E1125JF3 Panasonic	CAP FILM 1.2UF 5% 100VDC RADIAL	0
EZP-Q38335LTA Panasonic	CAP FILM 3.3UF 5% 380VAC RADIAL	300
ECQ-UAAF474SA Panasonic	CAP FILM 0.47UF 20% 275VAC RAD	1600
ECW-F2185JA Panasonic	CAP FILM 1.8UF 5% 250VDC RADIAL	940
ECW-F2W335JA Panasonic	CAP FILM 3.3UF 5% 450VDC RADIAL	1978
ECW-FE2J155PD Panasonic	CAP FILM 1.5UF 5% 630VDC RADIAL	400
ECQ-UAAF473KA Panasonic	CAP FILM 0.047UF 10% 275VAC RADI	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.