Classification of Capacitors and Dielectrics:
COG: Capacitors with this dielectric material are Class I capacitors, including regular and medium-high voltage COG products. These products have stable electrical performance, which hardly changes with temperature, voltage, and time. They are suitable for circuits with low loss and high stability requirements, such as filters, resonators, and timing circuits.
X7R, X5R, X6S, X7T: Capacitors with these dielectric materials are Class II capacitors, which have a higher dielectric constant and higher capacitance than Class I capacitors. They have relatively stable temperature characteristics and are suitable for circuits with a wide capacitance range and low stability requirements, such as DC blocking, coupling, bypass, and frequency discrimination circuits.
Y5V: Capacitors with this dielectric material are Class II capacitors, which have the largest dielectric constant among all capacitors. However, their capacitance stability is poor, and they are sensitive to conditions such as temperature and voltage. They are suitable for circuits requiring large capacitance and small temperature changes.