What should be paid attention to when using tantalum capacitors

What should be paid attention to when using tantalum capacitors

The full name of tantalum capacitor is tantalum electrolytic capacitor, which is a kind of electrolytic capacitor. It uses metal tantalum as the medium. Unlike ordinary electrolytic capacitors, which use electrolyte, tantalum capacitors do not need to be wound with aluminum-plated capacitor paper like ordinary electrolytic capacitors. , There is almost no inductance by itself.

Tantalum capacitor is a product with a small volume and a large capacitance among the capacitors, and its performance is excellent. Tantalum capacitors have various shapes and are made into small and chip components suitable for surface mounting. Tantalum capacitors are not only used in military communications, aerospace and other fields, but tantalum capacitors are also widely used in industrial control, film and television equipment, communication instruments and other products.

During the use of tantalum capacitors, pay attention to the performance characteristics of this type of capacitor in order to give full play to its functions, consider the working environment and heating temperature of the product, and take measures such as derating use. Improper use will affect the working life of the product.

Tantalum capacitors are electrolytic capacitors with polarity, and the polarity cannot be reversed during use. When used in reverse polarity, it will increase leakage or may cause a short circuit, or even smoke and explosion.

Circuits that cannot be used: high-impedance voltage holding circuit; coupling circuit; time constant circuit; circuit that has an influence on leakage current; circuit that increases withstand voltage in series.

Cannot charge or discharge quickly.

Confirm that the temperature range used is within the operating temperature range of the capacitor. The power supply current does not exceed the allowable ripple current. When the allowable ripple current is exceeded, the internal heat of the capacitor will increase and the service life will be reduced.

It is recommended that the voltage applied by the capacitor is 90% of the rated voltage. If the DC voltage is added to the AC voltage, the peak voltage cannot exceed the rated voltage; if the total DC voltage is added to the negative peak AC voltage, no negative voltage is allowed.