Mica and PTFE Capacitors

Part Number	Description / PDF	Quantity
CD10FA391GO3F Cornell Dubilier Electronics	CAP MICA 390PF 2% 100V RADIAL	0
MC18FA751J-F Cornell Dubilier Electronics	CAP MICA 750PF 5% 100V 1812	0
CMR06F122FODP Cornell Dubilier Electronics	CAP MICA 1200PF 500V RADIAL	0
CMR07F912FODR Cornell Dubilier Electronics	CAP MICA 9100PF 500V RADIAL	0
CMR07F822JODR Cornell Dubilier Electronics	CAP MICA 8200PF 500V RADIAL	0
CM05ED620JO3 Cornell Dubilier Electronics	CAP MICA 62PF 500V RADIAL	0
CMR05F121GODM Cornell Dubilier Electronics	CAP MICA 120PF 500V RADIAL	0
MCM01-009DD270G-F Cornell Dubilier Electronics	CAP MICA 27PF 2% 500V SMD	0
CD17CD100JO3 Cornell Dubilier Electronics	CAP MICA 10PF 5% 500V RADIAL	490
CMR05E750GODR Cornell Dubilier Electronics	CAP MICA 75PF 500V RADIAL	0
CMR07F113GODR Cornell Dubilier Electronics	CAP MICA 11000PF 500V RADIAL	0
CD30FD272JO3 Cornell Dubilier Electronics	CAP MICA 2700PF 5% 500V RADIAL	0
CMR04F331GOAM Cornell Dubilier Electronics	CAP MICA 330PF 100V RADIAL	0
CD30FD332GO3 Cornell Dubilier Electronics	CAP MICA 3300PF 2% 500V RADIAL	0
MIN02-001EC101K-F Cornell Dubilier Electronics	CAP MICA 100PF 10% 300V SMD	0
CMR03F301GOYP Cornell Dubilier Electronics	CAP MICA 300PF 50V RADIAL	0
CMR05F271JODM Cornell Dubilier Electronics	CAP MICA 270PF 500V RADIAL	0
MC08FA390J-TF Cornell Dubilier Electronics	CAP MICA 39PF 5% 100V 0805	0
CDV16FF361JO3 Cornell Dubilier Electronics	CAP MICA 360PF 5% 1KV RADIAL	132
CD5FA181JO3F Cornell Dubilier Electronics	CAP MICA 180PF 5% 100V RADIAL	100

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.