Mica and PTFE Capacitors

Part Number	Description / PDF	Quantity
CM05ED330JO3 Cornell Dubilier Electronics	CAP MICA 500V	0
CMR06F511FODP Cornell Dubilier Electronics	CAP MICA 510PF 500V RADIAL	0
CD4FD151GO3F Cornell Dubilier Electronics	CAP MICA 150PF 2% 500V RADIAL	0
CD30FC243GO3F Cornell Dubilier Electronics	CAP MICA 0.024UF 2% 300V RADIAL	0
CD10ED270JO3F Cornell Dubilier Electronics	CAP MICA 27PF 5% 500V RADIAL	2001600
CD5EC300JO3 Cornell Dubilier Electronics	CAP MICA 30PF 5% 300V RADIAL	0
CDV16FF182JO3 Cornell Dubilier Electronics	CAP MICA 1800PF 5% 1KV RADIAL	0
CD19FD431FO3 Cornell Dubilier Electronics	CAP MICA 430PF 1% 500V RADIAL	0
CMR05F201GODR Cornell Dubilier Electronics	CAP MICA 200PF 500V RADIAL	0
CD10CD010CO3F Cornell Dubilier Electronics	CAP MICA 1PF 1PF 500V RADIAL	0
CMR03E240DOAP Cornell Dubilier Electronics	CAP MICA 24PF 100V RADIAL	0
CDV16FF681JO3 Cornell Dubilier Electronics	CAP MICA 680PF 5% 1KV RADIAL	237400
CMR03E470GOCR Cornell Dubilier Electronics	CAP MICA 47PF 300V RADIAL	0
CMR08F823GOAR Cornell Dubilier Electronics	CAP MICA 82000PF 100V RADIAL	0
CMR06F431FODM Cornell Dubilier Electronics	CAP MICA 430PF 500V RADIAL	0
CD5EC360JO3 Cornell Dubilier Electronics	CAP MICA 36PF 5% 300V RADIAL	0
CD19FD272GO3F Cornell Dubilier Electronics	CAP MICA 2700PF 2% 500V RADIAL	0
CMR03E680JOAM Cornell Dubilier Electronics	CAP MICA 68PF 100V RADIAL	0
CD4ED270JO3 Cornell Dubilier Electronics	CAP MICA 27PF 5% 500V RADIAL	0
MC12ED200J-TF Cornell Dubilier Electronics	CAP MICA 20PF 5% 500V 1210	0

Mica and PTFE Capacitors

1. Overview

Mica and PTFE (Polytetrafluoroethylene) capacitors are specialized electronic components utilizing mica or PTFE as dielectric materials. Known for exceptional stability, low loss, and high-temperature resistance, they are critical in precision and high-frequency applications. Mica capacitors leverage natural mineral sheets for superior electrical properties, while PTFE capacitors offer excellent chemical resistance and thermal stability up to 200 C.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Mica Capacitors	High Q factor, low leakage current, stable over temperature/humidity	RF tuning circuits, military-grade oscillators
PTFE Film Capacitors	Self-healing properties, high dielectric strength, low moisture absorption	High-frequency power supplies, medical imaging equipment
High-Voltage PTFE Capacitors	Rated >1kV, arc-resistant design	Laser power systems, aerospace ignition modules

3. Structure and Composition

Mica Capacitors: Constructed by sandwiching mica sheets between vacuum-deposited aluminum electrodes. Encapsulated in ceramic or plastic shells with epoxy sealing. PTFE Capacitors: Made by winding PTFE film with metallized electrodes or using stacked foil structures. Terminations use silver epoxy or welded leads for low resistance.

4. Key Technical Specifications

Parameter	Typical Values	Importance
Capacitance Range	1pF-10 F (Mica), 100pF-4.7 F (PTFE)	Determines frequency response and filtering capability
Voltage Rating	50V-10kV	Defines operational safety margin
Temperature Coefficient	5-100ppm/ C	Stability in varying thermal conditions
Dissipation Factor	0.0001-0.002	Energy loss efficiency
Operating Temperature	-55 C to +200 C	Environmental durability

5. Application Areas

Key industries: Telecommunications (RF amplifiers), Aerospace (avionics filters), Medical (MRI gradient coils), Industrial (precision test equipment). Example: 1000V-rated PTFE capacitors in MRI machine deflection coil drivers.

6. Leading Manufacturers and Products

Manufacturer	Product Series	Key Specifications
Murata Manufacturing	NME3 Series	0.1-10nF, 500V, 30ppm/ C
KEMET	C8AK Series	100pF-4.7nF, 1kV, -55 C to +150 C
Vishay Beyschlag	MKP385 Series	1nF-1 F, self-healing, 200 C rating

7. Selection Guidelines

Consider: 1) Required capacitance tolerance (< 1% for critical filters), 2) Voltage derating (use 80% of rating), 3) Temperature extremes (select >20% margin), 4) Mechanical stress (radial vs axial leads), 5) Cost vs lifetime (mica preferred for >10 year deployments).

8. Industry Trends

Emerging trends: Miniaturization for 5G mmWave circuits, hybrid mica-PTFE composites for improved thermal management, and increased adoption in EV charging systems (1500V PTFE capacitors). Market growth projected at 7.2% CAGR (2023-2030) per Grand View Research.