Mica and PTFE Capacitors

Part Number	Description / PDF	Quantity
CMR03E470JOCP Cornell Dubilier Electronics	CAP MICA 47PF 300V RADIAL	0
CMR05F910GODP Cornell Dubilier Electronics	CAP MICA 91PF 500V RADIAL	0
CD17FA122JO3 Cornell Dubilier Electronics	CAP MICA 1200PF 5% 100V RADIAL	0
MC22FF251J-F Cornell Dubilier Electronics	CAP MICA 250PF 5% 1KV 2220	0
MC08EA200J-F Cornell Dubilier Electronics	CAP MICA 20PF 5% 100V 0805	2162600
CD15FD201GO3 Cornell Dubilier Electronics	CAP MICA 200PF 2% 500V RADIAL	0
CDV16FF102JO3F Cornell Dubilier Electronics	CAP MICA 1000PF 5% 1KV RADIAL	8249500
CD19FD102JO3 Cornell Dubilier Electronics	CAP MICA 1000PF 5% 500V RADIAL	1430
CD5CC040CO3 Cornell Dubilier Electronics	CAP MICA 4PF 1PF 300V RADIAL	0
MIN02-002CC4R7D-F Cornell Dubilier Electronics	CAP MICA 4.7PF 0.5PF 300V SMD	200
CD6ED470GO3 Cornell Dubilier Electronics	CAP MICA 47PF 2% 500V RADIAL	0
CMR04E560GODM Cornell Dubilier Electronics	CAP MICA 56PF 500V RADIAL	0
MCM01-010ED121G-F Cornell Dubilier Electronics	CAP MICA 120PF 2% 500V SMD	0
CMR05E510GODM Cornell Dubilier Electronics	CAP MICA 51PF 500V RADIAL	0
MIN02-002CC180J-F Cornell Dubilier Electronics	CAP MICA 18PF 5% 300V SMD	0
CMR04F121FODR Cornell Dubilier Electronics	CAP MICA 120PF 500V RADIAL	0
D103F681JO3 Cornell Dubilier Electronics	CAP MICA 680PF 5% 300V RADIAL	0
CMR06F911FODR Cornell Dubilier Electronics	CAP MICA 910PF 500V RADIAL	0
CMR06F302GODP Cornell Dubilier Electronics	CAP MICA 3000PF 500V RADIAL	0
CD7FD181GO3 Cornell Dubilier Electronics	CAP MICA 180PF 2% 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.