The SMD electrolytic capacitor size is related to weight and pin shape. Single ended is a radial lead type, screw is a lock screw type, and there are chip aluminum electrolytic capacitors. As for the weight, the same capacity is the same as the withstand voltage, but the two capacitors of different brands are compared, the weight must be different; and the appearance size is more related to the shell planning. Generally speaking, capacitors with the same diameter and the same capacity can be replaced by large capacitors with low heights, but the mechanism interference problem should be considered when replacing capacitors with high lengths.
SMD electrolytic capacitors produce various impedances and inductances due to their structure. ESR equivalent series resistance and ESL equivalent series inductance are a pair of important parameters-this is the basis of capacitive reactance. A capacitor with a small equivalent series resistance (ESR) and a relatively large external capacitor can well absorb the peak (ripple) current during fast transition. It is more cost-effective to use ESR capacitors in parallel.
The SMD electrolytic capacitor size are mainly divided into metric standards: 4*5.5mm, 5*5.5mm, 6.3*5.5mm, 6.3*7.7mm, 8*6.2mm, 8*10.2mm, 10*10.2mm, 10* 12mm etc.
The composition of the aluminum electrolytic capacitor is: it is composed of positive foil. Negative foil and electrolytic paper are wound into a core, and the positive and negative electrodes are drawn out with the lead wire, which is impregnated with the electrolyte, then led out through the guide pin, and then sealed with an aluminum shell and glue. Although the chip aluminum electrolytic capacitor has a small volume, the surface area of the electrode foil is enlarged after electrochemical corrosion, and its dielectric oxide film is very thin, so the chip aluminum electrolytic capacitor can have a relatively large capacitance .
