Mica and PTFE Capacitors

Part Number	Description / PDF	Quantity
CD19FD272FO3F Cornell Dubilier Electronics	CAP MICA 2700PF 1% 500V RADIAL	1050
CMR07F163JODR Cornell Dubilier Electronics	CAP MICA 16000PF 500V RADIAL	0
CD17FD201JO3 Cornell Dubilier Electronics	CAP MICA 200PF 5% 500V RADIAL	0
CD30FD512JO3F Cornell Dubilier Electronics	CAP MICA 5100PF 5% 500V RADIAL	0
CD15CD050DO3F Cornell Dubilier Electronics	CAP MICA 5PF 0.5PF 500V RADIAL	2741100
MC12FA680J-TF Cornell Dubilier Electronics	CAP MICA 68PF 5% 100V 1210	0
CD4FD361GO3 Cornell Dubilier Electronics	CAP MICA 360PF 2% 500V RADIAL	0
CD10ED220DO3F Cornell Dubilier Electronics	CAP MICA 22PF 0.5PF 500V RADIAL	0
CD5FA161GO3 Cornell Dubilier Electronics	CAP MICA 160PF 2% 100V RADIAL	0
CD10FD121JO3F Cornell Dubilier Electronics	CAP MICA 120PF 5% 500V RADIAL	100
CD15FD161JO3F Cornell Dubilier Electronics	CAP MICA 160PF 5% 500V RADIAL	418
CD19FD621JO3F Cornell Dubilier Electronics	CAP MICA 620PF 5% 500V RADIAL	0
CD5FY331JO3F Cornell Dubilier Electronics	CAP MICA 330PF 5% 50V RADIAL	0
CD19FC622FO3 Cornell Dubilier Electronics	CAP MICA 6200PF 1% 300V RADIAL	0
CMR05E510FODR Cornell Dubilier Electronics	CAP MICA 51PF 500V RADIAL	0
CMR03F121JOAR Cornell Dubilier Electronics	CAP MICA 120PF 100V RADIAL	0
CD19FD332FO3F Cornell Dubilier Electronics	CAP MICA 3300PF 1% 500V RADIAL	60550
CMR03F121JOAP Cornell Dubilier Electronics	CAP MICA 120PF 100V RADIAL	0
CD15ED620GO3 Cornell Dubilier Electronics	CAP MICA 62PF 2% 500V RADIAL	0
CMR03E820JOYM Cornell Dubilier Electronics	CAP MICA 82PF 50V 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.