Aluminum Electrolytic Capacitor

Aluminum Electrolytic Capacitor

Description

Features

Product Description

An electrolytic capacitor is a type of capacitor where the positive electrode (anode) is made of metal foil (aluminum or tantalum), and the dielectric is an oxide film (aluminum oxide or tantalum pentoxide) tightly adhering to the positive electrode. The negative electrode (cathode) consists of conductive material, electrolyte (which can be liquid or solid), and other materials. The capacitor is named "electrolytic" because the electrolyte is a major part of the cathode. It is important to note that the polarity of an electrolytic capacitor cannot be reversed.
Polarized electrolytic capacitors are commonly used in power circuits or medium/low frequency circuits for power filtering, decoupling, signal coupling, setting time constants, and blocking DC. They are generally not suitable for AC power circuits. When used as a filter capacitor in a DC power circuit, the anode (positive electrode) should be connected to the positive terminal of the power supply voltage, and the cathode (negative electrode) should be connected to the negative terminal of the power supply voltage. Reversing the connections can damage the capacitor.

Model Identification: The body of the electrolytic capacitor will have corresponding model identifications. Specifically:
Polarity Identification: Electrolytic capacitors are polarized and must be connected with the correct polarity. Otherwise, the capacitor may be damaged. There are two methods for identifying polarity:
- The side of the electrolytic capacitor has a color marking, with gray indicating the negative electrode.
- The length of the leads can also be used to determine polarity, with the longer lead being the positive electrode and the shorter lead being the negative electrode.

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