Mica and PTFE Capacitors

Part Number	Description / PDF	Quantity
MCM01-034ED102K-F Cornell Dubilier Electronics	CAP MICA 1000PF 10% 500V SMD	0
CD5FY361GO3 Cornell Dubilier Electronics	CAP MICA 360PF 2% 50V RADIAL	0
CDV19FF681JO3 Cornell Dubilier Electronics	CAP MICA 680PF 5% 1KV RADIAL	641000
CMR07F752GODM Cornell Dubilier Electronics	CAP MICA 7500PF 500V RADIAL	0
CD15FD910JO3 Cornell Dubilier Electronics	CAP MICA 91PF 5% 500V RADIAL	0
CMR04E220JODM Cornell Dubilier Electronics	CAP MICA 22PF 500V RADIAL	0
CMR04E430GODP Cornell Dubilier Electronics	CAP MICA 43PF 500V RADIAL	0
CMR05E390JODM Cornell Dubilier Electronics	CAP MICA 39PF 500V RADIAL	0
CD15ED360GO3 Cornell Dubilier Electronics	CAP MICA 36PF 2% 500V RADIAL	0
CMR07F912GODP Cornell Dubilier Electronics	CAP MICA 9100PF 500V RADIAL	0
CD16FD821JO3 Cornell Dubilier Electronics	CAP MICA 820PF 5% 500V RADIAL	0
CMR03F361JOYR Cornell Dubilier Electronics	CAP MICA 360PF 50V RADIAL	0
CD15FD251GO3F Cornell Dubilier Electronics	CAP MICA 250PF 2% 500V RADIAL	971500
CMR03F201JOYM Cornell Dubilier Electronics	CAP MICA 200UF 50V	0
CMR07F622JODP Cornell Dubilier Electronics	CAP MICA 6200PF 500V RADIAL	0
CMR03E270GOCR Cornell Dubilier Electronics	CAP MICA 27PF 300V RADIAL	0
CD4FC821GO3 Cornell Dubilier Electronics	CAP MICA 820PF 2% 300V RADIAL	0
29140B103JO0 Cornell Dubilier Electronics	CAP MICA 10000PF 5% 4KV AXIAL	2
CD10CD060CO3F Cornell Dubilier Electronics	CAP MICA 6PF 1PF 500V RADIAL	0
CMR04C4R5DODR Cornell Dubilier Electronics	CAP MICA 4.5PF 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.