Mica and PTFE Capacitors

Part Number	Description / PDF	Quantity
CD17FD241JO3 Cornell Dubilier Electronics	CAP MICA 240PF 5% 500V RADIAL	0
CMR05F331FODM Cornell Dubilier Electronics	CAP MICA 330PF 500V RADIAL	0
CD18FD182JO3F Cornell Dubilier Electronics	CAP MICA 1800PF 5% 500V RADIAL	0
MIN02-002DC390J-F Cornell Dubilier Electronics	CAP MICA 39PF 5% 300V SMD	0
CMR08F243JODR Cornell Dubilier Electronics	CAP MICA 24000PF 500V RADIAL	0
CMR05C6R0DODP Cornell Dubilier Electronics	CAP MICA 6PF 500V RADIAL	0
MC12ED220J-F Cornell Dubilier Electronics	CAP MICA 22PF 5% 500V 1210	170600
CD10ED470JO3F Cornell Dubilier Electronics	CAP MICA 47PF 5% 500V RADIAL	138600
CMR03E240DOAR Cornell Dubilier Electronics	CAP MICA 24PF 100V RADIAL	0
CMR05E620FODP Cornell Dubilier Electronics	CAP MICA 62PF 500V RADIAL	0
MC12FD101J-TF Cornell Dubilier Electronics	CAP MICA 100PF 5% 500V 1210	0
CMR05F361JODP Cornell Dubilier Electronics	CAP MICA 360PF 500V RADIAL	0
CD5FY331GO3F Cornell Dubilier Electronics	CAP MICA 330PF 2% 50V RADIAL	0
CMR05C8R0DODR Cornell Dubilier Electronics	CAP MICA 8PF 500V RADIAL	0
CMR06F432JODR Cornell Dubilier Electronics	CAP MICA 4300PF 500V RADIAL	0
MC12FD131J-F Cornell Dubilier Electronics	CAP MICA 130PF 5% 500V 1210	0
CM05FD241GO3 Cornell Dubilier Electronics	CAP MICA 240PF 500V RADIAL	0
MC12FA251J-TF Cornell Dubilier Electronics	CAP MICA 250PF 5% 100V 1210	0
CMR07F512FODP Cornell Dubilier Electronics	CAP MICA 5100PF 500V RADIAL	0
CMR05C2R0DODM Cornell Dubilier Electronics	CAP MICA 2PF 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.