The main characteristics of electrolytic capacitors are: large capacitance, low voltage, low frequency, large tolerance value, large leakage current, high loss, etc. Therefore, they are widely used in fields such as power filtering, coupling and winding, timing circuits, and power voltage regulators. Due to the presence of electrolyte in electrolytic capacitors, their performance stability and lifespan are subject to certain limitations. When the electrolytic capacitor ages or malfunctions, it needs to be replaced in a timely manner. When replacing electrolytic capacitors, the following principles need to be followed:
Principle of capacitance value replacement: Replace aged or faulty electrolytic capacitors with electrolytic capacitors with the same capacitance value.
Principle of voltage replacement: The working voltage of an electrolytic capacitor is one of its most critical parameters. When replacing, it is necessary to ensure that the working voltage of the selected electrolytic capacitor is not less than the voltage of the original electrolytic capacitor.
Polarity replacement principle: Electrolytic capacitors have two polarities, positive and negative. When replacing, it should be ensured that the polarity of the selected electrolytic capacitor is the same as the original electrolytic capacitor.
Quality replacement principle: Choosing high-quality electrolytic capacitors can ensure long-term stable operation of the components.
Actual circuit application situation: It should be based on the actual circuit application situation, not only on surface attribute parameters, otherwise it is easy to cause various unstable factors in the circuit.
Ordinary electrolytic capacitors
The replacement range of ordinary electrolytic capacitors is relatively wide, and electrolytic capacitors with the same voltage level, capacitance value, polarity, and size can be used for replacement.
Long life electrolytic capacitors
Long life electrolytic capacitors typically have higher operating temperatures and longer service life. When replacing long-life electrolytic capacitors, it is necessary to choose electrolytic capacitors with the same rated operating temperature and lifespan for replacement.
Ultra low impedance electrolytic capacitor
Ultra low impedance electrolytic capacitors are used in high-frequency applications and operate in harsh environments. When replacing ultra-low impedance electrolytic capacitors, it is necessary to choose electrolytic capacitors with the same impedance value for replacement.
Aluminum electrolytic capacitor
Aluminum electrolytic capacitors have a wide range of applications and can be replaced with electrolytic capacitors of the same voltage level, capacitance value, and polarity.
When replacing aluminum electrolytic capacitors in actual circuits, the first step is to identify the circuit requirements and follow the principle of replacing electrolytic capacitors according to different circuit types, in order to ensure the stability of the circuit.