Mica and PTFE Capacitors

Part Number	Description / PDF	Quantity
CD4FC681GO3F Cornell Dubilier Electronics	CAP MICA 680PF 2% 300V RADIAL	0
CMR05E270GODM Cornell Dubilier Electronics	CAP MICA 27PF 500V RADIAL	0
CMR04E820JODP Cornell Dubilier Electronics	CAP MICA 82PF 500V RADIAL	0
CMR03F101GOAM Cornell Dubilier Electronics	CAP MICA 100PF 100V RADIAL	0
CMR06F102FODM Cornell Dubilier Electronics	CAP MICA 1000PF 500V RADIAL	0
CMR05E470JODP Cornell Dubilier Electronics	CAP MICA 47PF 500V RADIAL	0
CMR04F391GOAP Cornell Dubilier Electronics	CAP MICA 390PF 100V RADIAL	0
CD30FD252FO3F Cornell Dubilier Electronics	CAP MICA 2500PF 1% 500V RADIAL	0
CM04ED430GO3 Cornell Dubilier Electronics	CAP MICA 43PF 500V RADIAL	0
CMR03F301GOYR Cornell Dubilier Electronics	CAP MICA 300PF 50V RADIAL	0
CD7FA331JO3 Cornell Dubilier Electronics	CAP MICA 330PF 5% 100V RADIAL	0
CD10ED470GO3F Cornell Dubilier Electronics	CAP MICA 47PF 2% 500V RADIAL	0
CD30FD252GO3 Cornell Dubilier Electronics	CAP MICA 2500PF 2% 500V RADIAL	0
MC08CA070D-F Cornell Dubilier Electronics	CAP MICA 7PF 0.5PF 100V 0805	0
MC18FA361F-F Cornell Dubilier Electronics	CAP MICA 360PF 1% 100V 1812	0
CD15FC621JO3 Cornell Dubilier Electronics	CAP MICA 620PF 5% 300V RADIAL	0
CD5CC010CO3 Cornell Dubilier Electronics	CAP MICA 1PF 1PF 300V RADIAL	0
CD4FA152GO3F Cornell Dubilier Electronics	CAP MICA 1500PF 2% 100V RADIAL	0
MC12EF120J-F Cornell Dubilier Electronics	CAP MICA 12PF 5% 1KV 1210	0
CD10ED430JO3 Cornell Dubilier Electronics	CAP MICA 43PF 5% 500V RADIAL	121

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.