Mica and PTFE Capacitors

Part Number	Description / PDF	Quantity
CD30FD222JO3 Cornell Dubilier Electronics	CAP MICA 2200PF 5% 500V RADIAL	0
CMR05C100DODR Cornell Dubilier Electronics	CAP MICA 10PF 500V RADIAL	0
CM04FA391FO3 Cornell Dubilier Electronics	CAP MICA 390PF 100V RADIAL	0
CMR08F823JOAR Cornell Dubilier Electronics	CAP MICA 82000PF 100V RADIAL	0
CMR05F221FODR Cornell Dubilier Electronics	CAP MICA 220PF 500V RADIAL	0
CMR03E680JOYR Cornell Dubilier Electronics	CAP MICA 68PF 50V RADIAL	0
MC12FA131F-TF Cornell Dubilier Electronics	CAP MICA 130PF 1% 100V 1210	0
MC12CD050D-F Cornell Dubilier Electronics	CAP MICA 5PF 0.5PF 500V 1210	296
MC12CD010D-TF Cornell Dubilier Electronics	CAP MICA 1PF 0.5PF 500V 1210	0
CD4FD271FO3 Cornell Dubilier Electronics	CAP MICA 270PF 1% 500V RADIAL	0
CMR08F363GODM Cornell Dubilier Electronics	CAP MICA 36000PF 500V RADIAL	0
CMR03E300GOYP Cornell Dubilier Electronics	CAP MICA 30PF 50V RADIAL	0
CD30FD242GO3F Cornell Dubilier Electronics	CAP MICA 2400PF 2% 500V RADIAL	0
CD18ED750JO3F Cornell Dubilier Electronics	CAP MICA 75PF 5% 500V RADIAL	0
CD10CD050DO3F Cornell Dubilier Electronics	CAP MICA 5PF 0.5PF 500V RADIAL	13501500
MC08CA050D-F Cornell Dubilier Electronics	CAP MICA 5PF 0.5PF 100V 0805	91000
CD4CD180JO3 Cornell Dubilier Electronics	CAP MICA 18PF 5% 500V RADIAL	0
CMR03C100DOCP Cornell Dubilier Electronics	CAP MICA 10PF 300V RADIAL	0
CD19FD272FO3F Cornell Dubilier Electronics	CAP MICA 2700PF 1% 500V RADIAL	1050
CMR07F163JODR Cornell Dubilier Electronics	CAP MICA 16000PF 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.