Tantalum Capacitor and Aluminum Electrolytic Capacitor Selection and Application (I)

First. The application of tantalum capacitor selection

1, the superior characteristics of tantalum capacitors may make you put it down

The tantalum capacitor has a wide operating temperature range, stable temperature characteristics, large specific capacitance, and unique self-healing properties, which can meet the stability of long-term operation.

2, the inherent fatal weakness of tantalum capacitors, let you hate iron and steel

The key component of common tantalum capacitors is TA205. The stress of the dielectric after heating is unstable, the voltage for reliable use is low, and the surge voltage and inrush current capability are both poor. The failure mode is short circuit, which easily causes high temperature, fire, etc. Other injuries.

3, the key to the reliable application of tantalum capacitors

For the helium dioxide dioxide capacitor, the voltage derating is performed, and the working voltage of the helium dioxide capacitor decreases as the temperature increases. When the temperature is higher than 85 degrees, the recommended voltage is 33% of the rated voltage, and the risk of failure can be greatly reduced.

Second. The application of conventional aluminum electrolytic capacitor selection

1, the advantages and disadvantages of aluminum electrolytic capacitors:

Advantages: It has the obvious advantages of easy access to large capacity, high pressure resistance, low cost, etc. It is commonly used in input and output filter circuits of power supplies.

Disadvantages: Fear of high temperature, because the electrolyte of the aluminum electrolytic capacitor is liquid, the core heating or high ambient temperature will cause the electrolyte to volatilize, long-term high temperature causes the electrolyte to dry out failure.