Mica and PTFE Capacitors

Part Number	Description / PDF	Quantity
CD17FD421JO3F Cornell Dubilier Electronics	CAP MICA 420PF 5% 500V RADIAL	4
CMR08F823GOAM Cornell Dubilier Electronics	CAP MICA 82000PF 100V RADIAL	0
CM04FD221JO3 Cornell Dubilier Electronics	CAP MICA 500V	1100
CDV19EF620JO3F Cornell Dubilier Electronics	CAP MICA 62PF 5% 1KV RADIAL	0
CMR05E820FODP Cornell Dubilier Electronics	CAP MICA 82PF 500V RADIAL	0
CD15FA911FO3F Cornell Dubilier Electronics	CAP MICA 910PF 1% 100V RADIAL	0
CMR03E430GOCP Cornell Dubilier Electronics	CAP MICA 43PF 300V RADIAL	0
CMR03E680GOAM Cornell Dubilier Electronics	CAP MICA 68PF 100V RADIAL	0
CD5EC820GO3F Cornell Dubilier Electronics	CAP MICA 82PF 2% 300V RADIAL	0
CMR05F111JODR Cornell Dubilier Electronics	CAP MICA 110PF 500V RADIAL	0
CD6FC111FO3 Cornell Dubilier Electronics	CAP MICA 110PF 1% 300V RADIAL	0
CD19FA822JO3 Cornell Dubilier Electronics	CAP MICA 8200PF 5% 100V RADIAL	0
CMR06F561FODM Cornell Dubilier Electronics	CAP MICA 560PF 500V RADIAL	0
D105F271JO3F Cornell Dubilier Electronics	CAP MICA 270PF 5% 500V RADIAL	0
MC12FA620F-F Cornell Dubilier Electronics	CAP MICA 62PF 1% 100V 1210	0
MC22FF101J-F Cornell Dubilier Electronics	CAP MICA 100PF 5% 1KV 2220	843
MC08CA100D-F Cornell Dubilier Electronics	CAP MICA 10PF 0.5PF 100V 0805	0
CD10ED750GO3F Cornell Dubilier Electronics	CAP MICA 75PF 2% 500V RADIAL	0
CD17FD501JO3F Cornell Dubilier Electronics	CAP MICA 500PF 5% 500V RADIAL	0
CD4CD120DO3 Cornell Dubilier Electronics	CAP MICA 12PF 0.5PF 500V RADIAL	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.