✓ Ceramic Capacitors Dielectric

Ceramic Capacitors Dielectric

The ceramic capacitor gains its name from the fact that it uses ceramic materials for its dielectric. Its temperature variation of capacitance is within 15 from 550c to 1250c.

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The dielectric thickness is inversely related to the capacitance value so the thicker the dielectric the lower the capacitance value.

Ceramic capacitors dielectric. The composition of the ceramic material defines the electrical behavior and therefore applications. The active area is just the overlap between two opposing electrodes. X7r is the most popular of these intermediate dielectric constant materials.

It is constructed of two or more alternating layers of ceramic and a metal layer acting as the electrodes. Capacitance drift or hysteresis for c0g np0 ceramics is negligible at less than 005 versus up to 2 for films. X7r formulations are called temperature stable ceramics and fall into eia class ii materials.

C0g np0 ceramics offer one of the most stable capacitor dielectrics available. The dielectric constant is determined by the ceramic material np0 x7r x5r or y5v. For barium titanate devices the curie temperature can be in the range of 1300c to 1500c depending on the particular formulation.

Common types include c0g np0 x7r y5v z5u although there are many more. A ceramic capacitor is a fixed value capacitor where the ceramic material acts as the dielectric. Capacitance change with temperature is 0 30ppm0c which is less than 03 c from 550c to 1250c.

Within the ceramic capacitor family there are many forms of ceramic dielectric that are used. While manufacturing the ceramic capacitor the dielectric is exposed to temperatures more than 10000c.