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Film Capacitor: definition, usage, types and other FAQs

Film Capacitor definition, usage, types and other FAQs

Film capacitor also was called plastic film capacitors, polymer film capacitors, and film dielectric capacitors.Each of these names refers to a capacitor that is a little bit different from the others. The performance of these capacitors is superior to that of other components on the market of a comparable sort that are covered in film or foil.

In this article, you will learn the answers to some of the most frequently asked questions regarding film capacitors. Some of the topics covered include the definition of film capacitors, how they are used, the different types available, and the benefits they provide.

What is film capacitor?

Film capacitors are electronic components mainly made of three materials-metal foil, polypropylene, polystyrene, which are used to hold an electrical charge. It is a non-polarized capacitor with metal foil as the electrode and thin plastic as the dielectric.
What is film capacitorBecause of its high insulation impedance, excellent frequency characteristics, and small dielectric losses, film capacitors are used in a large number of analog circuits and can be found in many household appliances.

In addition to having a cost that is not extremely expensive, a low self-inductance as well as an ESR, and the capacity to withstand enormous amounts of reactive power, these capacitors also have the advantage of being extremely stable.

What’s the type of film capacitor?

Film capacitors can be divided into the following categories according to different classification criteria.
What’s the type of film capacitorElectrolyte-film capacitor can be divided into three categories.



Plastic film-film capacitor can be divided into four categories.
Polyethylene-based capacitors (Mylar capacitors)

Polypropylene capacitor(PP capacitor)

Polystyrene capacitor (PS capacitor)

Polycarbonate capacitors

Terminal – film capacitor can be divided into two categories.
DC link film capacitors

AC link film capacitors

What is the advantage of a film capacitor?

Film capacitors have various advantages. For instance, because polypropylene is an ingredient in film capacitors’ construction, these components might be used for the production of Class 1 applications.In addition, there are the following advantages:What is the advantage of a film capacitor
◆ The characteristics of film not easily aging and self-healing function determine the long life of film capacitors.

◆ High resistance to overvoltage and high temperature, the temperature range of the product can be from -40℃ to 105℃.

◆ Non-polarity, no need to distinguish between positive and negative poles.

◆ low dielectric loss and wide frequency response.

What is a film capacitor used for and how it works?

Firstly, the role of film capacitors is to hold the electric charge as what all capacitors do.The capacitor works by storing charge on the electrodes to store electrical energy, and is usually used in conjunction with an inductor to form an LC oscillation circuit.

The principle of capacitor operation is that the charge will be moved by the force in the electric field, and when there is a medium between the conductors, the charge will be prevented from moving and the charge will accumulate on the conductors, resulting in the accumulation of charge storage.

What’s the application of film capacitor?

Film capacitor finds usage in a vast array of applications, some of which are listed below:What is the application of a film capacitor

(1)Electronic gadgets
(2)Domestic appliances
(5)electrified trains
(6)Hybrid automobiles
(7)Wind power

(8)Solar power.
(9)The series RLC combination of a capacitor, an inductor, and a frequency-dependent electrical conductor (a resistor) for filtering and high-frequency bypass.
(10)Integrating circuit, oscillation circuit and timer IC

What’s the material of film capacitor?

The films are made of a material called polyethylene terephthalate (PET). After that, the final product may be put to use. Film capacitors often do not have polarity, which means that any terminal may be used with any other terminal in the device. This is because each terminal is independent from the others in the device. This is due to the fact that each terminal is completely separate from the others.

What is the difference between ceramic and film capacitors?

Although there are a significant number of minute differences between ceramic and film capacitors, there are only a few key variances that exist between the two types of capacitors.What is the difference between ceramic and film capacitors
◆ Media material
Ceramic capacitors and film capacitors use ceramic and plastic film as respectively.

◆ Cost
Ceramic capacitors are more cheaper than film capacitors, because ceramic material tends to carry a lower price tag than material of film capacitor.

◆ Inductance
Film capacitors have a higher inductance than ceramic capacitors.

◆ Capacity
The capacity of ceramic capacitor is smaller, and the capacity of film capacitor is larger.

◆ Application
Film capacitors are often used in filter circuits and analog circuits, and ceramic capacitors are often used in digital electronic products because if their differences.

How long do film capacitors last?

A film capacitor’s efficiency is greatest during its first year of life. This doesn’t mean the film capacitor will stop working completely after a year, but it does suggest it won’t be as effective as it was when you first got it. If you take good care of them, you may expect them to endure for at least twenty years, and probably more like thirty.

How does a film capacitor fail?

The following may contribute to the failing of a film capacitor:
(1) Corrosion damage to the metalized film
(2) Electrical overstress
(3) Solder stresses
(4) Mechanical damage.
(5) Over heating

How to determine the polarity of a film capacitor?

If we inspect the positive and negative leads of the capacitor and compare the heights of these leads to one another, we should be able to determine which pole the capacitor is on. The anodes and cathodes are the two terminals that are present on an electrolytic capacitor.How to determine the polarity of a film capacitor
The anodes are the terminals that extend the furthest, while the cathodes are the ones that are the shortest. The electrostatic field of the capacitor is thought to be able to be said to extend between these two terminals of the device, according to a notion that has been put out.

How do you read a film capacitor?

The first two digits of the number represent the value in picofarads, and the third digit indicates the number of zeroes that should be added to the first two digits. The value is expressed in picofarads as the first two digits of the number. For instance, if the capacitor had the label E476, it would communicate that it had a capacity of 4.7 F and a working voltage of 25 V. This information would be conveyed by the label. The value is 47 Farads (F), which is equivalent to 47,000,000 picofarads (pF) (47,000 nF).


Film capacitors are one of the many types of capacitors, others include safety capacitors, super capacitors, ceramic capacitors and electrolytic capacitors.We hope that you have gained good understanding of the film capacitors and the associated questions through this article . You can visit IBE website to know more about other types of capacitor. Do visit our blog to know more about our articles, products and services,

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