Ceramic capacitor: It is a general term for capacitors with ceramic materials as the medium. As mentioned in the resistor classification chapter, ceramic materials are good students. Ceramic media has many advantages: higher operating temperature, large specific capacity, good moisture resistance, small dielectric loss, and the capacitance temperature coefficient can be selected in a wide range wait. Therefore, it can be made into a variety of different ceramic capacitors, so it has a wide range of applications.
We often classify them according to different ceramic dielectrics: Class I ceramic capacitors and Class II ceramic capacitors.
Class I ceramic capacitors: mainly include NPO, SL0, and COG; their capacitance has very good stability and basically does not change with changes in temperature, voltage, time, etc., but the capacitance is generally very small.
——This type of capacitor has high precision and small temperature coefficient, and is suitable for high-precision application scenarios; for example, the matching capacitor (pF level) in the crystal oscillation circuit uses NP0/COG capacitors.
Class II ceramic capacitors: X7R,
——The main advantages of this type of capacitor are its low price, large capacity, small size, and small parasitic resistance/inductance. It can meet the needs of most signal DC isolation, low-voltage power supply filtering/coupling and other application requirements on a single board.
Post time: May-31-2024
