Application Selection of Tantalum Capacitors
Time:
2018-05-16
1. The superior characteristics of tantalum capacitors may make you love it
Tantalum capacitors have a wide operating temperature range, stable temperature characteristics, large specific capacity, and unique self-healing characteristics, which can meet the stability of long-term operation.
2. The inherent Achilles heel of tantalum capacitors makes you hate iron but not steel
The key component of ordinary tantalum capacitor is Ta2O5, the medium should be unstable after heating stress, reliable use of low voltage, anti-surge voltage and surge current ability are poor, and the failure mode is short circuit, easy to cause high temperature, fire and other damage. Fire and other injuries. Fire and other injuries
3. The key to reliable application of tantalum capacitors
For the tantalum manganese dioxide capacitor introduced above, the voltage is derated, and the working voltage of the tantalum manganese dioxide capacitor decreases with the increase of temperature, and the recommended voltage is 85% of the rated voltage when the temperature is higher than 33 °C, and the risk of failure can be greatly reduced. The risk of failure can be greatly reduced. The risk of failure can be greatly reduced.
1) Control the temperature of the tantalum capacitor, reduce the ripple current and keep away from the heat source.
2) Try not to put the tantalum capacitor on the input side of the power supply to filter, at the moment of turning on the power supply, the large inrush current is easy to cause the tantalum capacitor to fail.
3) Switch to tantalum polymer capacitors: The above introduction is the lower price of tantalum manganese dioxide capacitors, which have more Achilles heels and are disabled in some occasions. In addition to retaining many advantages of tantalum manganese dioxide capacitors, the failure risk of tantalum polymer capacitors is greatly reduced. The recommended voltage of tantalum polymer capacitors is significantly higher than that of tantalum manganese dioxide capacitors. Compared with tantalum manganese dioxide capacitors, its voltage tolerance is significantly improved.
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