Tantalum Capacitors:
Advantages: small size, large capacitance, diverse appearance, long life, high reliability, wide operating temperature range
Disadvantages: small capacity, expensive, voltage and current capacity is weak
Application: military communications, aerospace, industrial control, film and television equipment, communication instruments
1, belongs to a kind of electrolytic capacitor, the use of metal tantalum as a medium, unlike ordinary electrolytic capacitors as the use of electrolyte, tantalum capacitors do not need to use aluminum-plated capacitor paper winding as ordinary electrolytic capacitors, itself almost no inductance, but this also limits its capacity. -We are in large capacity, but need low ESL scene, we choose tantalum capacitor.
2. Since there is no electrolyte inside the tantalum capacitor, it is suitable for working at high temperatures. -Some temperature range requirements are relatively wide scene.
3. The working medium of tantalum capacitor is a very thin tantalum pentoxide film generated on the surface of tantalum metal. This layer of oxide film, the dielectric and the composition of the capacitor at one end of the pole into a whole, can not exist alone. Therefore, it has a very high operating field strength per unit volume, and has a particularly large capacitance, that is, a very high specific capacity, and is therefore particularly suitable for miniaturization. -The scene with high integration degree, the area occupied by aluminum electrolytic capacitor is relatively large, and the capacity of ceramic capacitor is not enough.
4. Tantalum capacitors have excellent performance. They are products with small volume and large capacitance in capacitors. There are few competitors in power supply filtering, AC bypass and other purposes. Tantalum electrolytic capacitors have the properties of storing electricity, charging and discharging, and are mainly used in filtering, energy storage and conversion, mark bypass, coupling and decoupling, and time constant components. In the application should pay attention to its performance characteristics, the correct use will help to give full play to its function, such as considering the product working environment and its heating temperature, as well as the use of derating and other measures, if used improperly will affect the working life of the product. -For example, the USB interface output needs to be derated, the withstand voltage meets 5V, and the integration degree is relatively high. Ceramic capacitors do not meet the high withstand voltage and large capacity, we have to choose tantalum capacitors. The energy storage effect of ceramic capacitors cannot be equivalent according to the parallel capacitance value, and the cost required to achieve the same effect is also very high.
5. The temperature stability of the capacitance value of the tantalum capacitor is better. In some coupling and filtering scenarios, if the phase and filtering frequency characteristics are relatively high, and the capacity accuracy is relatively high, the non-polar tantalum capacitor will be selected. Such as high sound quality requirements of the audio circuit design.
We need to consider the accuracy and consistency of the capacitance at different temperatures.
The temperature characteristic of the ceramic capacitor is obviously not stable enough.
6. In the working process of tantalum capacitor, it has the performance of automatically repairing or isolating the defects in the oxide film, so that the oxide film medium can be reinforced and restored its due insulation ability at any time, without being continuously damaged by accumulation. This unique self-healing property ensures its long life and reliability advantages. -aluminum electrolytic capacitor due to dry can not meet the life of the scene.