The general view is that tantalum capacitors perform better than aluminum capacitors because the tantalum capacitor is a tantalum pentoxide produced by anodization. Its dielectric capacity (usually expressed as 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 the case of a certain capacity, the higher the dielectric capacity, the smaller the volume can be made. Otherwise, the volume needs to be made larger) 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However, this method of judging the performance of the capacitor by the anode is outdated.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.
Another view is that tantalum capacitors perform better than aluminum capacitors, mainly because they are significantly better than aluminum electrolyte capacitors after adding manganese dioxide cathode. If the cathode of the aluminum electrolyte capacitor is replaced with manganese dioxide, its performance can actually be improved.
To be sure, ESR is one of the main parameters for measuring a capacitor's characteristics. However, to select a capacitor, you should avoid the ESR as low as possible, 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.
--- The above quotes the experience summary of some netizens.
The structure of a common electrolytic capacitor is an anode and a cathode and an electrolyte, the anode is passivated aluminum, and the cathode is pure aluminum, so the key is at the anode and the electrolyte. The quality of the anode is related to the problem of resistance to piezoelectric coefficient.
In general, the ESR of tantalum electrolytic capacitors is much smaller than that of aluminum electrolytic capacitors of the same capacity and with high voltage resistance, and the high frequency performance is better. If that capacitor is used in a filter circuit (such as a 50 Hz bandpass filter), pay attention to the effect of the change in capacity on the filter performance (passband...).
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