Operating Temperature:	-40°C ~ 70°C
Features:	--
Ratings:	--
Applications:	Motor Run
Lead Spacing:	0.810" (20.57mm)
Termination:	Quick Connect, Disconnect
Height - Seated (Max):	4.030" (102.36mm)
Size / Dimension:	3.660" L x 1.970" W (92.96mm x 50.04mm), Lip
Package / Case:	Radial, Can
Mounting Type:	Chassis Mount
Series:	SF
Dielectric Material:	Polypropylene (PP), Metallized
Voltage Rating - DC:	--
Voltage Rating - AC:	440V
Tolerance:	±10%
Capacitance:	45µF
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Film Capacitors

Introduction

Film capacitors, also known as film dielectric capacitors, are a type of parallel-plane capacitor. This type of capacitor produces a high level of capacitance in a small form factor by using a plastic film tape as its dielectric. This type of capacitor is most commonly used in audio equipment, radio frequency circuits, and numerous other applications.

SFD44S45K391B-F application field and working principle

The SFD44S45K391B-F capacitor is a popular film capacitor used in numerous applications. It is a polystyrene film capacitor which has a temperature coefficient of 0.5%. The capacitor has a working voltage range of 100 volts, and its capacitance range is between 2.2uF and 4.7uF. It has a tolerance of ±20%, storage temperature range of -55°C to +125°C, and self-healing characteristics.The working principle behind the SFD44S45K391B-F capacitor is relatively simple. When the dielectric material separates the two plates of the capacitor it is subjected to an electric field. This forces an electric current through the dielectric material, creating a charge. This charge stays constant until an opposing current is introduced, causing it to short-circuit.The SFD44S45K391B-F capacitor is commonly used in audio applications due to its low ESR and high self-healing properties. Furthermore, it is ideal for high-frequency applications where the capacitor is subjected to frequent spikes in voltage. It is also commonly used in measuring and test equipment, particularly in circuits where precision and accuracy are required.

Advantages of Film Capacitors

Film capacitors have several advantages over other types of capacitors. Firstly, they have a wide operating temperature range which makes them well suited for applications where frequent temperature fluctuations occur. Secondly, they have excellent heat resistance which makes them suitable for applications which require continuous high frequency operation, as well as extreme operating temperatures. Additionally, film capacitors have exceptionally low losses, which make them ideal for applications such as timing circuits or current filters.

Conclusion

In conclusion, film capacitors are versatile and reliable components used in numerous applications. The SFD44S45K391B-F capacitor is one such product which has numerous advantages over other traditional capacitors. It has a high capacitance in a small form factor, it has a wide operating temperature range, excellent heat resistance, and exceptionally low losses. This makes the SFD44S45K391B-F capacitor an ideal choice for a variety of applications where accuracy and precision are paramount.

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Part Number	Manufacturer	Price	Quantity	Description