The difference between polyester capacitors and ceramic capacitors

Recently, many customers have asked the editors whether polyester capacitors have a particularly obvious advantage over ceramic capacitors. It seems that everyone has a particularly high demand for polyester capacitors. Actually, editors, I think the demand for both capacitors is very high. They all have their own characteristics and play an important role in the circuit.

Polyester capacitor refers to a metal foil film made of a prime, rolled into a cylindrical or flat cylindrical core, the medium is polyester, polyester film capacitor. The ceramic capacitor is extruded from a high dielectric constant capacitor ceramic barium titanate titanate into a circular tube, a disk or a disk as a medium, and is plated with silver on the ceramic as an electrode by a fire infiltration method. To say that they are different, the editor will list them for you and hope to help everyone!

1. The capacitance of polyester capacitor is 40p--4up, the capacitance of high-frequency ceramic capacitor is 1p--6800p, and the capacitance of low-frequency ceramic capacitor is 10p--4.7up.

2. The rated voltage of polyester capacitor is 63--630V, the rated voltage of high-frequency ceramic capacitor is 63--500V, and the rated voltage of low-frequency ceramic capacitor is 50V--100V.

3. Polyester capacitor has small volume, high dielectric constant, small volume, large capacity, heat and humidity resistance, but the stability is poor, suitable for bypass capacitors, many low frequency circuits with low stability and loss requirements. . High-frequency ceramic capacitors have high frequency loss and good stability, and are suitable for high-frequency circuits. Low-frequency ceramic capacitors have the characteristics of small size and low price, but have large losses and poor stability, and are suitable for low-frequency circuits that are not required. In addition, polyester capacitors have many small classifications, such as the common CL11, CL21. The inner wall of the CL21 capacitor is metallized and has a much smaller volume than the CL11, but the overall performance is not as good as CL11. Ceramic capacitors are classified into X7R, X5R, Y5U, Y5V, NP0, SL0, COG, etc.

In fact, no matter which kind of capacitor is indispensable in the circuit, it is necessary to select the appropriate capacitor according to the requirements of the circuit and their characteristics.