Mica and PTFE Capacitors

Part Number	Description / PDF	Quantity
CD6ED430GO3 Cornell Dubilier Electronics	CAP MICA 43PF 2% 500V RADIAL	0
CM04ED510JO3 Cornell Dubilier Electronics	CAP MICA 500V	0
CD5CC080DO3F Cornell Dubilier Electronics	CAP MICA 8PF 0.5PF 300V RADIAL	0
CMR03E430JOAM Cornell Dubilier Electronics	CAP MICA 43PF 100V RADIAL	0
CMR08F473GODR Cornell Dubilier Electronics	CAP MICA 47000PF 500V RADIAL	0
CD15FC821FO3 Cornell Dubilier Electronics	CAP MICA 820PF 1% 300V RADIAL	0
CMR05F131GODP Cornell Dubilier Electronics	CAP MICA 130PF 500V RADIAL	0
CMR05F361FODM Cornell Dubilier Electronics	CAP MICA 360PF 500V RADIAL	0
CD42FD253FO3F Cornell Dubilier Electronics	CAP MICA 0.025UF 1% 500V RADIAL	0
CMR03E360JOAP Cornell Dubilier Electronics	CAP MICA 36PF 100V RADIAL	0
CD10FA331GO3F Cornell Dubilier Electronics	CAP MICA 330PF 2% 100V RADIAL	0
MC22FF151G-F Cornell Dubilier Electronics	CAP MICA 150PF 2% 1KV 2220	0
CM06FD432JO3 Cornell Dubilier Electronics	CAP MICA 4300PF 500V RADIAL	0
CD7FD151FO3 Cornell Dubilier Electronics	CAP MICA 150PF 1% 500V RADIAL	0
CD4FD391GO3F Cornell Dubilier Electronics	CAP MICA 390PF 2% 500V RADIAL	0
CMR03C3R5DOCP Cornell Dubilier Electronics	CAP MICA 3.5PF 300V RADIAL	0
CDV16FF202JO3F Cornell Dubilier Electronics	CAP MICA 2000PF 5% 1KV RADIAL	52350
MC18FD131G-TF Cornell Dubilier Electronics	CAP MICA 130PF 2% 500V 1812	0
MIN02-002EC820K-F Cornell Dubilier Electronics	CAP MICA 82PF 10% 300V SMD	0
MC12FD500G-F Cornell Dubilier Electronics	CAP MICA 50PF 2% 500V 1210	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.