What is a tantalum capacitor, and what are the differences between tantalum capacitors and electrolytic capacitors? 3

5、 The difference between tantalum capacitors and electrolytic capacitors

(1). Principle and Structure

Tantalum capacitor is an electrolyte capacitor composed of tantalum metal as the positive electrode plate, aluminum oxide (Al2O3) as the insulation layer, and negative electrode plate. The electrolyte of tantalum capacitors is a high impedance aluminum oxide film with a very high dielectric constant and extremely low capacitor leakage current. The principle is to utilize the high dielectric constant and good capacitance performance of alumina, and use tantalum metal film and alumina film as positive and negative plates respectively to form a capacitor. diode

Electrolytic capacitor is an electrolyte capacitor composed of aluminum foil or tungsten wire as the positive electrode plate, and aluminum oxide (Al2O3) as the insulation layer and negative electrode plate. The electrolyte of electrolytic capacitors is a low impedance aluminum oxide film with good conductivity and low capacitance leakage current. The principle is to utilize the high dielectric constant and good capacitance performance of alumina, and use aluminum foil or tungsten wire film and alumina film as positive and negative plates respectively to form a capacitor.

(2). capacitance value

The capacitance value of tantalum capacitors is smaller than that of electrolytic capacitors, generally ranging from a few microfarads to several hundred microfarads. The capacitance value of electrolytic capacitors is relatively large, generally ranging from a few millifarads to several hundred millifarads. diode

(3). Operating voltage

The working voltage of tantalum capacitors is higher than that of electrolytic capacitors, generally ranging from tens to hundreds of volts. The working voltage of electrolytic capacitors is relatively low, usually between a few volts and several tens of volts.

(4). size

Tantalum capacitors have a smaller volume compared to electrolytic capacitors because their capacitance value is relatively small, while electrolytic capacitors have a larger capacitance value. Therefore, tantalum capacitors with the same capacitance value are smaller in size than electrolytic capacitors.

(5). price

The price of tantalum capacitors is relatively high, usually several times or even more than electrolytic capacitors. This is because tantalum metal is a rare metal with a high price, and the manufacturing process of tantalum capacitors is also relatively complex. The price of electrolytic capacitors is relatively low because the price of aluminum foil or tungsten wire is relatively low and the manufacturing process is relatively simple.

In short, tantalum capacitors are important electronic components that play an indispensable role in electronic products. With the development of electronic products and the increasing demand for applications, the market prospects of tantalum capacitors will also become increasingly broad. diode