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The tantalum capacitor medium is tantalum pentoxide formed after anodization, and its dielectric capacity (usually represented by ε) is higher than that of aluminum capacitors. Therefore, in the case of the same capacity, the volume of the tantalum capacitor can be made smaller than that of the aluminum capacitor (the capacitance of the electrolytic capacitor depends on the dielectric capacity and volume of the medium. In case of a certain capacity, the higher the dielectric capacity, the smaller the volume can be made. Otherwise, the volume needs to be made bigger).In addition, the nature of tantalum is relatively stable, so tantalum capacitor performance is generally considered to be better than aluminum capacitors.
However, this method of judging the performance of the capacitor by the anode is outdated. The key to determining the performance of the electrolytic capacitor is not the anode but the electrolyte,that is, the cathode. Because different cathodes and different anodes can be combined into different types of electrolytic capacitors, their performance is also very different. The capacitance of the same anode can vary greatly depending on the electrolyte. In general, the effect of the anode on the performance of the capacitor is much smaller than that of the cathode.
To be sure, ESR is one of the main parameters for measuring a capacitor's characteristics. However, if you choose a capacitor, you should avoid the ESR as low as better, and the higher the quality, the better. To measure a product, we must consider it in all directions and from multiple angles. We must not exaggerate the role of capacitors intentionally or unintentionally.
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