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35ST155M3225X Film Capacitors Application Field and Working Principle

A film capacitor, also known as a plastic film capacitor, is a type of capacitor that uses a thin plastic film as its dielectric material, instead of a paper or paper and impregnated oil combination as used for the paper capacitors. They are mainly used for their electrical insulation characteristics and their very low losses at frequencies as high as few GHz.

Type of Film Capacitors

Film capacitors are further divided into several categories based on the thin film materials used, such as polyester films (PETP), polycarbonate films (PCP), polypropylene films (PPP), and polyphenylene sulphide films (PPS), as well as based on the type of construction that utilizes the principle of the dielectric films. These capacitors are classified according to the method of winding used, construction of the electrodes, the type of film, and the type of anode used in bottom construction.

35ST155M3225X Film Capacitor

The 35ST155M3225X is a polyester film capacitor that has been designed for automotive and general industry applications. It has a rated capacity of 155μF and a maximum voltage of 32V DC. It is designed with a three-layer design, which includes a base of polyester foil, a copper foil used as the anode and a steel electrode used as the cathode.

Application Field

This type of film capacitor is highly reliable and can be used in a wide range of applications. It is used for power conditioning and filtering, high frequency filtering, bypassing, and coupling on DC, AC, and pulse circuits. The 35ST155M3225X is suitable for applications requiring low parasitics, including AC inrush current limiting, EMI/RFI noise suppression, and noise cancellation in power supply applications.

Working Principle

The 35ST155M3225X film capacitor works on the same principle as other film capacitors. A voltage applied across the metal electrodes separated by the dielectric material (polyester film) can generate an electric field that passes across the film. This creates an electric charge which is stored in the dielectric and on the metal electrodes, thus forming a capacitor. The dielectric material of this type of film capacitor has a very low dielectric loss, thus allowing the capacitor to have very high frequency and power handling capability.

Advantages of 35ST155M3225X Film Capacitors

The main advantages offered by 35ST155M3225X film capacitors include high stability, reliability, high insulation resistance, very low losses, high frequency and power handling capability, and a long product lifetime. This type of capacitor is suitable for use in high current and inverter applications and can withstand high temperatures. It can also withstand high inrush currents.

Conclusion

The 35ST155M3225X is a popular Polyester film capacitor widely used in a variety of automotive and general industry applications. It offers several advantages such as high stability, reliability, high insulation resistance, very low losses, high frequency and power handling capability, and long product lifetime. It can be used for applications requiring low parasitics, such as AC inrush current limiting, EMI/RFI noise suppression, and noise cancellation in power supply applications.

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