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Image of KEMET Ceramic Capacitor Basics - MLCC Construction

MLCCs are constructed using alternating layers of ceramic dielectric with metal electrodes. Each layer represents a single capacitor and adding additional layers adds more capacitance to the MLCC since they are in parallel. Capacitance is calculated from the MLCC Capacitance Equation highlighted in yellow. By looking at the parameters in the equation, increasing the dielectric constant (K), area of the electrodes (A), or the number of electrodes (n), will increase the capacitance. Also, since capacitance is inversely proportional to the ceramic thickness (d), decreasing the ceramic thickness will also result in an increase in capacitance. For almost all MLCC suppliers, the best method for increasing capacitance is to reduce the dielectric thickness. This not only increases the capacitance based on the MLCC capacitance equation but allows more layers to fit in the same MLCC, further increasing capacitance.

PTM Published on: 2021-01-06