CMR04F391JPAP

Series:	CMR
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Capacitance:	390pF
Tolerance:	±5%
Voltage - Rated:	100V
Dielectric Material:	Mica
Operating Temperature:	-55°C ~ 150°C
Mounting Type:	Through Hole
Package / Case:	Radial
Lead Spacing:	0.150" (3.80mm)
Features:	General Purpose
Size / Dimension:	0.390" L x 0.220" W (9.90mm x 5.60mm)
Height - Seated (Max):	0.382" (9.70mm)

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Mica and PTFE Capacitors

Mica and PTFE Capacitors, such as the popular CMR04F391JPAP capacitor, are composed of two dissimilar dielectrics. Like most dielectrics, they offer excellent electrical properties such as low inductance, high capacitance, and low electrical loss. In addition, they are characterized by their non-dissipative operation, extended temperature range, and superior insulating properties.

Application Field

Mica and PTFE capacitors are most widely applied in DC power coupling applications. It can be effectively used for audio amplifiers, switching power supplies and AC line filtering. Additionally, these capacitors are also used in high frequency RF filters and high voltage applications such as line-by-line filters, rectifiers, and connection networks. Moreover, the extended temperature range and superior stability of these capacitors make them ideal for mission-critical applications in various industries.

Working Principle

Mica and PTFE capacitors work by storing an electric charge by building up separator layers between two sets of electrodes. Basically, the polymer layer acts as one of the electrodes and the mica layer acts as the other. When a charge is applied, the electrodes are separated by the insulator layer, which serves as a dielectric. Since the dielectric has a high dielectric strength, electric charges don’t leak out. Additionally, the insulator layer provides superior insulation, offering reliable protection against shorts and overvoltages.

Construction

The CMR04F391JPAP is a type of film capacitor with an outer wrapping of protective mica and PTFE, hence its name, Mica and PTFE Capacitor. Its special construction consists of a PTFE-wrapped mica substrate, which connects to the innermost copper layer providing an insulated outer layer around the capacitor. The center core of the capacitor contains several layers of PTFE film with independent layers of copper electrodes.

Advantages

Being an oxide-free capacitor, the CMR04F391JPAP boasts a number of advantages. Firstly, the capacitor has extremely low leakage current and provides superior stability and durability. In addition, the PTFE-wrapped mica substrate assures safety by providing dependable insulation and protection from overvoltages and short circuits. Furthermore, the extended temperature range of −55 °C to 85 °C helps the capacitor to survive in extreme environments too. Additionally, this PTFE-wrapped capacitor offers low ESR and ESL levels, which minimizes power dissipation.

Disadvantages

Despite its numerous advantages, the CMR04F391JPAP has some limitations too. Firstly, the cost of the capacitor is relatively higher compared to other types of capacitors. Additionally, its size is large, making it difficult to fit in tight spaces. Moreover, its working temperature range is not so high, making it unsuitable for applications in extremely cold temperatures.

Conclusion

Mica and PTFE capacitors, including the CMR04F391JPAP capacitor, are versatile and provide numerous advantages over other types of capacitors. They are most commonly used in DC power coupling applications and offer excellent dielectric properties, high capacitance, long life, and superior stability. Moreover, the extended temperature range and superior insulating properties make these capacitors ideal for mission-critical applications in various industries.

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