The primary features and cautions on usage of MLCC, aluminum electrolytic capacitors, and tantalum electrolytic capacitors are shown here. It is important to understand these cautions on usage as well as the merits and demerits of these capacitors when replacing them with an MLCC. While large-capacitance MLCCs make it possible to replace electrolytic capacitors, it is important to note their shortcoming which is the large rate of change in capacitance due to temperature and DC bias. In addition, an ESR which is too low has adverse effects and may lead to anomalous oscillations in power supply circuits.