Ceramic Capacitors FAQ

Characteristics

What is the difference in the features and applications between the high dielectric type (X5R/B, X7R/R etc.) and the temperature compensating type (CH, C0G, etc.)?

Refer to the following table.

  High Dielectric Type
Temperature Compensating Type
Main Temperature Characteristics
B/X5R、R/X7R characteristics, etc.
CH、COG characteristics, etc.
Features
- Main material: Ferroelectric barium titanate (BaTiO3)
- Since this material provides a high relative dielectric constant from 1,000 - 20,000 at room temperature, small sizes and large capacity can be acquired.
- The relative dielectric constant changes with the temperature and voltage.
Therefore, when this material is applied in a time constant circuit, etc., it is necessary to understand that the operating condition of the electronic circuit may change.
- The capacitance changes over time.
- Main material: Paraelectric titanium oxide (TiO2) or calcium zirconate (CaZrO3)
- Since the relative dielectric constant is about 20 - 300, the capacitance is lower than the high dielectric type.
- The characteristics of this material are that the relative dielectric constant changes almost linearly with the temperature. The change in the capacitance value over time is negligible. Even in high temperatures, high voltages, and high frequencies, the tanδ (loss of capacitor) remains low and is excellent in stability.
- There is almost no change in capacitance from the changes in the dielectric constant over time or the voltage ignition, and has a high Q-value (1,000 - 8,000).
Main Applications
- Used in personal computers, digital appliances, smart phones, and others.
- Taking advantage of the excellent high frequency characteristics, this capacitor is widely used as a decoupling capacitor to prevent the occurrence of noise, and indicates excellent functionality for noise absorption.
Recently, an acceptable value from several uF - 100uF could be acquired, and applications as a smoothing capacitor for various power supplies are also progressing.
- In addition, this capacitor is used widely for bypasses, couplings, filter circuits, etc.
- This capacitor is used in TV tuner circuits, etc.
- Recently, the capacitance has expanded to 0.1uF, and is starting to be used for the snubber circuits of DC-DC converters, audio, etc.
- In addition, this capacitor is used for high-frequency circuits (oscillating circuits, tuning, coupling circuits, etc.).

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Changes over time

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