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What factors affect the capacitance of ceramic capacitors
Dec 29, 2018

When ferroelectric materials (such as barium titanate) are used as ceramic capacitors of dielectric materials, the effect of applied voltage on the actual capacitance value is often obvious. Barium titanate is often used in X5R and X7R ceramic capacitors. Some capacitors lose up to 70 percent of their nominal capacitance due to applied voltage.

Some ceramic capacitors manufacturers selectively reduce dielectric thickness or adjust dielectric formulations to maintain the same level of capacitance in smaller packages. This design change may result in higher voltage stresses and greater capacitance loss. The size of package affects the thickness of dielectric. Under the same voltage, especially for ceramic capacitance with ferroelectric material as dielectric material, the smaller the thickness of dielectric material is, the greater the internal electric field stress will be.

In practice, the voltage, the type of dielectric material and the thickness of dielectric will all have an impact on the actual capacitance value of ceramic capacitors.

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