21FD3715-F

Operating Temperature:	-40°C ~ 70°C
Features:	--
Ratings:	--
Applications:	Motor Run; Power Factor Correction (PFC)
Lead Spacing:	0.813" (20.64mm)
Termination:	Quick Connect, Disconnect
Height - Seated (Max):	2.880" (73.15mm)
Size / Dimension:	1.875" Dia (47.63mm), Lip
Package / Case:	Radial, Can
Mounting Type:	Chassis Mount, Requires Holder/Bracket
Series:	MPF
Dielectric Material:	Polypropylene (PP), Metallized
Voltage Rating - DC:	--
Voltage Rating - AC:	370V
Tolerance:	±10%
Capacitance:	15µF
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction

A film capacitor, sometimes known as a polyester capacitor, refers to a capacitor that uses film as a dielectric. Film capacitors typically use a thin plastic film, including polyethylene terephthalate (PET), polypropylene (PP), nylon, polycarbonate (PC), and Teflon, along with metal layers as the electrodes. The 21FD3715-F is a PP film capacitor produced by NIDEKCORP, a Japan-based manufacturer of electrical components. This application note will discuss the field of application and working principle of the 21FD3715-F, and provide an overview of how it can be used in applications.

Field of Application

The 21FD3715-F is designed for general-purpose DC and low-frequency AC applications. It can be used to provide fixed capacitance in power supplying, wave filtering, and in other applications where a steady and dependable DC or low-frequency AC voltage is required. Film capacitors are generally preferred over other types of capacitors due to their higher insulation resistance, voltage stability, and superior performance in extreme temperatures.Film capacitors are also widely used in power factor correction applications. They work by providing a low impedance path to the AC corner of the power supply. By reducing the AC portion of the voltage wave-form, power factor correction capacitors help to reduce energy losses due to resistive heating and current harmonics.The 21FD3715-F is suitable for applications that require a capacitance value between 6.8μF and 120μF at a voltage rating of 350V~AC/400V~DC. As such, they are suitable for a wide range of industries including automotive, electronics, audio-visual, and lighting.

Working Principle

The 21FD3715-F film capacitor is constructed with a pair of metal electrodes and a dielectric layer of PP (polypropylene) film. The PP film serves as a dielectric, or insulating layer between the two electrodes. When a voltage is applied, the film becomes electrically charged, and the electrode surface charges build up a mutual electrostatic force. This force creates a significantly lower resistive path for current flow, allowing the capacitance to remain constant and stable over a wide range of frequencies.In terms of capacitance, the 21FD3715-F works the same way as any other capacitor. It has a capacitance range of 6.8μF to 120μF, and the voltage rating is 350V~AC/400V~DC. Additionally, it has a temperature coefficient of ±30ppm/°C, meaning that the capacitance will change by no more than 0.03muF (+/-30ppm) over a temperature range of -55°C to +105°C.

Conclusion

The 21FD3715-F film capacitor is a high-quality polypropylene capacitor designed for use in general-purpose DC and low-frequency AC applications. It can be used for power factor correction, supplying fixed capacitance, wave filtering, and other applications. The 21FD3715-F has a voltage rating of 350V~AC/400V~DC, a capacitance range of 6.8μF to 120μF, and a very low temperature coefficient of ±30ppm/°C. With its superior performance in extreme temperatures, high insulation resistance, and excellent voltage stability, the 21FD3715-F can provide reliable performance and long-term reliability in a variety of applications.

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