CBB21 is a fairly common metal-foil electrolytic capacitor with a variety of specifications. Its main features include: a wide range of capacitance, generally a few skin method to several hundred micromethods; Rated voltage in tens of volts to hundreds of volts, suitable for different circuit requirements; High frequency response is good, suitable for high frequency circuit; Good temperature stability, can work normally in a wide temperature range; Long service life, with good durability; Small size, light weight, suitable for small electronic devices. In short, CBB21 capacitors can meet the needs of a variety of circuits and are one of the commonly used electronic components.