WMF4S47K-F

Operating Temperature:	-55°C ~ 125°C
Features:	--
Ratings:	--
Applications:	General Purpose
Lead Spacing:	--
Termination:	PC Pins
Height - Seated (Max):	--
Size / Dimension:	0.433" Dia x 0.874" L (11.00mm x 22.20mm)
Package / Case:	Axial
Mounting Type:	Through Hole
Series:	WMF
Dielectric Material:	Polyester
Voltage Rating - DC:	400V
Voltage Rating - AC:	200V
Tolerance:	±10%
Capacitance:	0.047µF
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction to Film Capacitors

Film capacitors, also referred to as plastic film capacitors, are non-ceramic capacitors that use plastic films as the dielectric. They are widely used due to their ability to maintain a stable temperature rating, good electrical characteristics, and large working voltage. Film capacitors are mainly built on polypropylene (PP) or polyesters (PET) film, and may even be stacked in a film capacitor case, depending on the application.

WMF4S47K-F Applications and Working Principle

The WMF4S47K-F is a film capacitor suitable for high-voltage, long-life and long-term applications. It offers a working voltage of 4KV (4000 VDC) and distinguishes itself from other capacitors due to the energy storage principle and high temperature stability. The capacitor has an anode made of multiple layers of polypropylene film, while the cathode is composed of aluminum foil. Typically, the power dissipation of a film capacitor is low, ranging from 0.05W to 0.2W. The working principle of a film capacitor is simple. When current flows through the anode and cathode, electric field lines are generated and the charges are stored. The charge stored depends on the thickness of the dielectric and the area of the electrodes. Due to their properties, the WMF4S47K-F film capacitors are suitable for use in a variety of applications, such as pulse shaping and energy storage. Other applications include motor start-up, rotor speed control, coupling, and energy storage.

Advantages of the WMF4S47K-F

The main advantage of the WMF4S47K-F film capacitor is its robustness and stability. It offers a nominal capacitance of 47nF, with a maximum deviation of 15% from its rated value. The operating temperature range of the capacitor is from -25℃ to 85℃, making it suitable for both indoor and outdoor applications. Film capacitors have a number of advantages over ceramic and aluminum electrolytic capacitors. Firstly, they are able to withstand large AC ripple currents and have a good AC voltage withstand, which are important in capacitive power-supply filters. Secondly, they also boast superior temperature characteristics and have quieter ESR than any other type of capacitors. Furthermore, they exhibit good self-healing characteristics and are impervious to environmental conditions such as humidity and oil. Lastly, their high thermal stability makes them suitable for applications with high ambient temperature.

Conclusion

The WMF4S47K-F film capacitor is a highly reliable capacitor that is suitable for a wide range of high-voltage, long-life, and long-term applications. It has a number of advantages over ceramic and aluminum electrolytic capacitors, such as its fatigue-resistant properties, consistent performance, high temperature stability, and good self-healing characteristics. Additionally, the robust design of the capacitor helps to protect against external disturbances in operation. Film capacitors are widely used for various electronic applications, making the WMF4S47K-F a valuable addition to the parts inventory.

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