Ceramic Capacitor Value Vs Voltage

The capacitance is often described in the product description as nominal value please note that among ceramic capacitors the capacitance especially of capacitors classified as high dielectric constant b x5r r x7r characteristic may differ from the nominal value when a dc voltage is applied.

Ceramic capacitor value vs voltage.

Capacitance change over time for class 2 x7r and x5r dielectric capacitors. Note first that as the package size increases the capacitance variation with applied dc voltage decreases and substantially. Insulation resistance is the resistance measured across the dielectric of a capacitor. Multi layer ceramic capacitor mlcc mlccs are manufactured by accurately mixing finely ground granules of paraelectric and ferroelectric materials and alternatively layering the mix with metal contacts.

The letter j signifies the tolerance of 5. In ceramic capacitors can also be caused by ac voltage. It is important to mention that class 2 mlcc capacitance value changes significantly with applied voltage. A second interesting point is that within a package size and ceramic type the voltage rating of the capacitors seems often to have no effect.

Excerpting from the kemet page you link to in this article. Depending on the dielectric formulation these capacitors can lose more than 70 of its rated capacitance with applied. They are very easy to decode to find the value. Mlcc 0 0 8 1 6 2 4 3 2 4 1 0 0 6 0 4 0 8 0 2 dc volts applied 298d 47 μf mlcc 47 μf mlcc 100 μf.

Typical voltage coefficient of capacitance. The third digit is the multiplier which is 1000. However the rule of thumb dictates that you should derate ceramic capacitors by 50 which means that if you are expecting to have a maximum of 5v between the capacitor s leads then you should use a capacitor rated for 10v or more. The first two significant digits represent the first two digits of the actual value which is 47.

Ceramic disc capacitor code label will normally consist of three numbers followed by a letter. These 10 capacitors give the voltage rating and value commensurate with a single film capacitor. Ceramic capacitor ir and dcl. Ceramic disc capacitors have a capacitance value of 10pf to 100μf with a wide variety of voltage ratings between 16 volts to 15 kv and more.

Dc voltage for select 4 7µf capacitors. One thing to keep in mind is that ceramic capacitors will lose their capacitance value as the voltage approaches. As capacitance values and hence the area of dielectric increases the ir decreases.