How many of the 17 capacitors do you know?
01 Ceramic capacitor
The capacitor is made of ceramic material as dielectric, coated with a layer of metal (silver) film on the ceramic surface, and then sintered at high temperature as electrode. Porcelain capacitors are divided into Class 1 dielectric (NPO, CCG), Class 2 dielectric (X7R, 2X1) and Class 3 dielectric (Y5V, 2F4).
? characteristic
Class 1 ceramic capacitors have the advantages of small temperature coefficient, high stability, low loss, high withstand voltage, etc. The maximum capacity does not exceed 1000 pF, and the commonly used series are CC1, CC2, CC18A, CC11, CCG, etc.
2. Class 3 ceramic dielectric capacitors are characterized by high dielectric coefficient and large capacity (up to 0.47 μ F) Small size, poor loss and insulation performance compared with Class 1.
? purpose
Class 1 capacitors are mainly used in high-frequency circuits. 2. Class 3 is widely used in medium and low frequency circuits as capacitors for isolation, coupling, bypass and filtering. CT1, CT2 and CT3 series are commonly used.
02 Polyester capacitor
Polyester capacitor is a non-polar capacitor with positive temperature coefficient (that is, when the temperature rises, the capacitance becomes larger) made of polar polyester film as the medium.
High temperature resistance, high pressure resistance, moisture resistance and low price. It is generally used in medium and low frequency circuits. Common models include CL11, CL21 and other series.
03 Polystyrene capacitor
This kind of capacitor has two types: foil type and metallized type.
Foil insulation has high resistance, low dielectric loss, stable capacity and high accuracy, but large volume and poor heat resistance; The moisture-proof and stability of metallized type is better than that of foil type, and it can self recover after breakdown, but the insulation resistance is low and the high-frequency characteristics are poor.
It is generally used in medium and high frequency circuits. Common models include CB10, CB11 (unsealed foil type), CB14~16 (precision type), CB24, CB25 (unsealed metallization), CB80 (high-pressure type), CB40 (sealed metallization) and other series
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