Mica and PTFE Capacitors

Part Number	Description / PDF	Quantity
CD15ED750JO3 Cornell Dubilier Electronics	CAP MICA 75PF 5% 500V RADIAL	155700
CD42FD503FO3 Cornell Dubilier Electronics	CAP MICA 0.05UF 1% 500V RADIAL	0
MC18FA251J-F Cornell Dubilier Electronics	CAP MICA 250PF 5% 100V 1812	0
CD30FD113JO3 Cornell Dubilier Electronics	CAP MICA 0.011UF 5% 500V RADIAL	0
CMR05E330JODM Cornell Dubilier Electronics	CAP MICA 33PF 500V RADIAL	0
CMR03E470JOAM Cornell Dubilier Electronics	CAP MICA 47PF 100V RADIAL	0
CD10FA391JO3 Cornell Dubilier Electronics	CAP MICA 390PF 5% 100V RADIAL	600
MC22FF271J-TF Cornell Dubilier Electronics	CAP MICA 270PF 5% 1KV 2220	0
CMR03E240DOYR Cornell Dubilier Electronics	CAP MICA 24PF 50V RADIAL	0
CD17FD121JO3F Cornell Dubilier Electronics	CAP MICA 120PF 5% 500V RADIAL	452
CMR03E220DOYP Cornell Dubilier Electronics	CAP MICA 22PF 50V RADIAL	0
MC22FA122J-TF Cornell Dubilier Electronics	CAP MICA 1200PF 5% 100V 2220	5000
CDV16FF152JO3F Cornell Dubilier Electronics	CAP MICA 1500PF 5% 1KV RADIAL	0
D105F431JO3 Cornell Dubilier Electronics	CAP MICA 430PF 5% 500V RADIAL	0
CD19FD131JO3 Cornell Dubilier Electronics	CAP MICA 130PF 5% 500V RADIAL	0
CD15FC751GO3 Cornell Dubilier Electronics	CAP MICA 750PF 2% 300V RADIAL	0
MIN02-002EC650J-F Cornell Dubilier Electronics	CAP MICA 65PF 5% 300V SMD	0
CMR03E680GOYR Cornell Dubilier Electronics	CAP MICA 68PF 50V RADIAL	0
CMR08F913FOAR Cornell Dubilier Electronics	CAP MICA 91000PF 100V RADIAL	0
CD7FA431JO3 Cornell Dubilier Electronics	CAP MICA 430PF 5% 100V 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.