Tantalum capacitor, full name is tantalum electrolytic capacitor .It is a kind of electrolytic capacitor. It uses metal tantalum as a medium. Unlike ordinary electrolytic capacitors, it uses electrolyte. Therefore, it is suitable for working at high temperatures. It is a small-capacity product in a capacitor that can achieve a large capacitance.
Compared with aluminum electrolytic capacitors, tantalum electrolytic capacitors have the following advantages.
- small volume
Since tantalum capacitors use tantalum powder with very fine particles, and the dielectric constant ε of the tantalum oxide film is 17 higher than that of the aluminum oxide film, the capacitance per unit volume of the tantalum capacitor is large.
- Wide operating temperature range
Generally, tantalum electrolytic capacitors can work normally at a temperature of -50°C to 100°C. Although aluminum electrolysis can also work within this range, the electrical performance is far inferior to that of tantalum electrolysis.
The tantalum oxide film medium in tantalum electrolytic capacitors is not only corrosion-resistant, long life, high insulation resistance, low leakage current, and it can maintain good performance for a long time.
- Impedance frequency characteristics
For capacitors with good impedance frequency characteristics and poor frequency characteristics, when the operating frequency is high, the capacitance will drop significantly and the loss (tgδ) will also rise sharply. But solid electrolytic capacitors can work above 50kHz. Tantalum capacitors will also decrease in capacity as the frequency increases, but the decrease is small. Some data show that the capacity of tantalum capacitors decreases by less than 20% when working at 10kHz, while the capacity of aluminum electrolytic capacitors decreases by 40%.
- High reliability
High reliability The chemical performance of the tantalum oxide film is stable, and because the tantalum anode substrate Ta2O5 can withstand strong acids and alkalis, it can use solid or acid-containing liquid electrolytes with low resistivity, which makes the loss of tantalum electrolysis than aluminum The electrolytic capacitor is small and has good temperature stability.