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Tantalum Capacitor Selection
1, the superior characteristics of tantalum capacitors may make you love not leave your hand
The tantalum capacitor has a wide operating temperature range, stable temperature characteristics, a large specific capacitance, and a unique self-healing characteristic that can meet the stability of long-term operation.
2, the inherent fatal weakness of tantalum capacitors, let you hate iron and steel，let you hate iron and stee let you hate iron and steel
The key component of an ordinary tantalum capacitor is Ta2O5. 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 above-mentioned helium dioxide dioxide capacitor, the voltage derating is performed, and the operating voltage of the helium dioxide capacitor decreases as the temperature increases. When the temperature is higher than 85°C, the recommended voltage is 33% of the rated voltage, and the risk of failure can be greatly increased. reduce.
1) Control tantalum capacitor temperature, reduce ripple current and keep away from heat sources.
2) Try not to filter the tantalum capacitor on the input side of the power supply. When the power is turned on, a large inrush current can easily cause the tantalum capacitor to fail.
3) Switching to a tantalum polymer capacitor: The above-mentioned is a lower-cost tantalum dioxide capacitor, which has more fatal weaknesses and is therefore disabled on certain occasions. In addition to the many advantages of helium-polymer capacitors, the risk of failure is greatly reduced. The recommended voltage of the polymer capacitor is significantly higher than that of the manganese dioxide capacitor.
Power capacitors in parallel and in series