Tolerance:+-5%, +-10% Type:Polypropylene Film Capacitor Rated Voltage:250v, 400v, 630V Operating Temperature:-40℃ to 105℃ Description:Metallized Polypropylene Film Capacitor Circuit Type:Isolated Capacitance Range:0.001UF –10UF Material:Metalized Polypropylene Size:Custom Size
Film Capacitor is also called Plastic Film Capacitor. It uses a plastic film as a dielectric. The film capacitor is a capacitor in which a metal foil is used as an electrode, and a plastic film such as polyethylene, polypropylene, polystyrene, or polycarbonate is overlapped from both ends and wound into a cylindrical structure.
Metallized film capacitor is a layer of metal film on the surface of the polyester film instead of metal foil as the electrode, because the thickness of the metallized film layer is much smaller than the thickness of the metal foil, so the volume after winding is also larger than the metal foil type capacitor Much smaller. The biggest advantage of metallized film capacitors is the “self-healing” characteristic. The so-called self-healing property is that if a thin film medium has a defect at a certain point and a short-circuit occurs under the action of an overvoltage, the metallized layer at the breakdown point can be instantly melted and evaporated under the action of an arc to form a small metal-free area , The two pole pieces of the capacitor are insulated from each other again and can continue to work, so the reliability of the capacitor operation is greatly improved.
Film capacitors are excellent capacitors because they have many excellent characteristics. Its main characteristics are as follows: non-polar, high insulation resistance, excellent frequency characteristics (wide frequency response), and small dielectric loss. Based on the above advantages, film capacitors are widely used in analog circuits. Especially in the part where the signal is connected, a capacitor with good frequency characteristics and extremely low dielectric loss must be used to ensure that the signal does not have too much distortion when it is transmitted.
Its structure is the same as paper dielectric capacitors. The dielectric is polyester or polystyrene. Polyester film capacitors have high dielectric constant, small size, large capacity, and good stability. They are suitable for bypass capacitors. Polystyrene film capacitors have low dielectric loss and high insulation resistance, but they have a large temperature coefficient and can be used in high-frequency circuits.
Among all plastic film capacitors, polypropylene (PP) capacitors and polystyrene (PS) capacitors have the most significant characteristics. Of course, these two types of capacitors are also relatively expensive. However, in recent years, in order to improve the sound quality of audio equipment, the parts and materials used have become more and more advanced, and the price is not the most important consideration. Higher. Readers can often see a certain brand of equipment, claiming how many brand-name PP or PS capacitors are used as an endorsement on sound quality, this is the reason.
Summary of characteristics: The capacity of the film capacitor is in the range of 3pF-0.1μF, the DC working voltage is 63-500V, suitable for high frequency and low frequency, and the leakage resistance is greater than 10000 Ω.
Film capacitors are mainly used in electronics, home appliances, communications, electric power, electrified railways, hybrid vehicles, wind power, solar power and other industries. The stable development of these industries has promoted the growth of the film capacitor market.