Mica and PTFE Capacitors

Part Number	Description / PDF	Quantity
D105F471JO3F Cornell Dubilier Electronics	CAP MICA 470PF 5% 500V RADIAL	0
CD10FA331JO3 Cornell Dubilier Electronics	CAP MICA 330PF 5% 100V RADIAL	93
CD7FA501JO3 Cornell Dubilier Electronics	CAP MICA 500PF 5% 100V RADIAL	0
CD6ED680JO3 Cornell Dubilier Electronics	CAP MICA 68PF 5% 500V RADIAL	0
MC12ED120J-F Cornell Dubilier Electronics	CAP MICA 12PF 5% 500V 1210	0
CD42FD333GO3 Cornell Dubilier Electronics	CAP MICA 0.033UF 2% 500V RADIAL	0
CD4FA112FO3F Cornell Dubilier Electronics	CAP MICA 1100PF 1% 100V RADIAL	0
CMR07F153JODP Cornell Dubilier Electronics	CAP MICA 15000PF 500V RADIAL	0
CD15CD100JO3F Cornell Dubilier Electronics	CAP MICA 10PF 5% 500V RADIAL	1283
CD5FY271GO3F Cornell Dubilier Electronics	CAP MICA 270PF 2% 50V RADIAL	0
CMR06F432GODM Cornell Dubilier Electronics	CAP MICA 4300PF 500V RADIAL	0
CM05FD161JO3 Cornell Dubilier Electronics	CAP MICA 160PF 500V RADIAL	0
CD15ED820JO3F Cornell Dubilier Electronics	CAP MICA 82PF 5% 500V RADIAL	394
CD4FD471JO3F Cornell Dubilier Electronics	CAP MICA 470PF 5% 500V RADIAL	0
CD19FD821JO3 Cornell Dubilier Electronics	CAP MICA 820PF 5% 500V RADIAL	128250
CMR03F161JOAP Cornell Dubilier Electronics	CAP MICA 160PF 100V RADIAL	0
CM05ED510GO3 Cornell Dubilier Electronics	CAP MICA 51PF 500V RADIAL	0
CD19FD681GO3 Cornell Dubilier Electronics	CAP MICA 680PF 2% 500V RADIAL	0
MC22FF101F-F Cornell Dubilier Electronics	CAP MICA 100PF 1% 1KV 2220	0
CD15FC821JO3 Cornell Dubilier Electronics	CAP MICA 820PF 5% 300V RADIAL	16

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.