Introduction of Tantalum Capacitors

Tantalum capacitors, I wonder if you have seen them. Tantalum capacitor is a product with small size and large capacity. There are many shapes of tantalum capacitors, and the application range is very wide. Then let me lead everyone to understand the advantages and disadvantages of tantalum capacitors and its main characteristics!

1. Advantages

The full name of tantalum capacitor is tantalum electrolytic capacitor, which is also a kind of electrolytic capacitor. It uses metal tantalum as the medium. Unlike ordinary electrolytic capacitors, it does not use electrolyte. Tantalum capacitors do not need to use aluminum-plated capacitor paper winding like ordinary electrolytic capacitors. The system has almost no inductance, but this also limits its capacity. In addition, since there is no electrolyte inside the tantalum capacitor, it is very suitable for working under high temperature. This unique self-healing performance guarantees its long life and reliability advantages. Solid tantalum capacitors have excellent electrical properties, wide operating temperature range, various forms, and excellent volumetric efficiency. They have their unique characteristics: the working medium of tantalum capacitors is an extremely thin tantalum pentoxide film formed on the surface of tantalum metal. The oxide film dielectric of this layer is combined with one end of the capacitor to form a whole and cannot exist alone. Therefore, it has a very high working electric field intensity per unit volume, and has a particularly large capacitance, that is, a very high specific capacity, so it is particularly suitable for miniaturization.

　 2. Disadvantages

　　The capacity is smaller, the price is more expensive than the aluminum capacitor, and the withstand voltage and current capability are weak. It is used in places where high-capacity filtering is used. For example, tantalum capacitors are always seen near CPU sockets. They are mostly used in conjunction with ceramic capacitors and electrolytic capacitors or used in places where voltage and current are not high.

　　 Three, main characteristics

Tantalum capacitors have a very high working electric field strength, and are larger than any type of capacitors, so as to ensure its miniaturization.

Tantalum capacitors can easily obtain larger capacitance, and there are few competitors in power supply filtering, AC bypass and other purposes.

Tantalum capacitors have unidirectional conductivity, which is so-called "polarity". When used, the current should be connected in the positive and negative directions of the power supply. If the "-" pole is connected incorrectly, not only the capacitor will not work, but also the leakage current is very large, the core will heat up in a short time, destroying the oxide film and then failing.

The working voltage of tantalum capacitors has a certain upper limit flat value, but the shortcomings in this respect are not important for matching transistors or integrated circuit power supplies.

Tantalum capacitors have the ability to store electricity, charge and discharge, and so on.