Ceramic capacitors are capacitors that use ceramic materials as the dielectric, coat the ceramic surface with a metal film, and form electrodes after high-temperature sintering. It is usually used in high-stability oscillation circuits as loop capacitors, bypass capacitors and pad capacitors. It is divided into high-voltage ceramic capacitors and low-voltage ceramic capacitors.
Advantages of ceramic chip capacitors:
High stability: Capacity loss changes minimally with temperature and frequency.
High reliability: suitable for long-term high voltage operation, with special series structure.
Suitable for large current loops: It has a high current ramp rate and is suitable for non-inductive structures of large current loops.
Things to note when choosing ceramic chip capacitors:
Choose versatile and standardized materials: Different temperature characteristics correspond to different capacity ranges and accuracy standards, which must comply with the series standards. The selection of the capacitance value should comply with the E24 (or E96) series value.
Select the model according to the line usage requirements: Select the appropriate model according to the working status and environmental conditions of the line to ensure that the main parameters meet the line usage requirements.
High-frequency resonant circuit: Choose Class 1 ceramic capacitors, which have small losses and good temperature stability, and have capacities ranging from a few PF to hundreds of PF.
Low-frequency coupling, bypass, and filter capacitors: Type 2 ceramic capacitors can be used, with a wide range of capacity selections, focusing on miniaturization and low cost.
Avoid use at over-rated voltage: Although ceramic capacitors have a large withstand voltage margin, they are not allowed to be used under conditions exceeding the rated voltage. Otherwise, the insulation resistance of the capacitor may decrease, affecting long-term reliability.
Selection under high temperature and high pressure conditions: For capacitors operating under high temperature and high pressure conditions, products with higher insulation resistance should be selected to ensure sufficient insulation resistance. Usually the insulation resistance should reach IR≥10000MΩ.
In general, ceramic capacitors have different materials and temperature groups compared to other types of capacitors, and therefore have different characteristics and capacitance ranges. When selecting and using ceramic capacitors, make reasonable selections based on specific application requirements and working conditions to ensure the performance and reliability of electronic equipment.