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The MLCC is a superior capacitor, but it also has weaknesses. The capacitance of an MLCC changes according to the applied voltage. This is called the "DC bias characteristic" when a DC voltage is applied. Changes in the capacitance (dependent on the DC bias) are rarely seen with a low-dielectric constant MLCC (type 1) but do appear with a high-dielectric constant MLCC (type 2). This is caused by the intrinsic polarization of the ferroelectric (BaTiO3) used by the high-dielectric constant material. For this reason, please consider the dielectric characteristics, the voltage used and the withstanding voltage when making a selection if it is to be used when applying a DC voltage. There is also a tendency for the capacitance to be significantly reduced in miniature-sized capacitors. The DC bias characteristics must also be considered when selecting the capacitance.

PTM Published on: 2015-09-10