Alternative problem of tantalum electrolytic capacitor

Among the commonly used electronic components, capacitors are the most complex types of components and specifications, especially in order to meet the requirements of different circuits and working environments. Even capacitors with the same capacitance value and rated voltage have many different types and materials. The choice of traits. There are two main reasons for replacing tantalum electrolytic capacitors into sheet-shaped multilayer ceramic capacitors.

The first is the reliability issue. Tantalum electrolytic capacitors have the potential to cause smoke and fire when a short circuit fault occurs. When smoke and fire occur, it is fatal for electronic products equipped with tantalum electrolytic capacitors.

The other is the problem of raw materials.钽 is a rare metal, and its origin is one of the few in the world. Therefore, if there is political turmoil in the place of production, it will fall into a situation of skyrocketing prices and unstable supply. As long as the raw materials are rare metals, it is impossible for users of tantalum electrolytic capacitors to completely avoid such risks.

The solution to these problems is to replace the tantalum electrolytic capacitor with a chip multilayer ceramic capacitor. Sheet-like multilayer ceramic capacitors are much less likely to emit smoke and fire than tantalum electrolytic capacitors. In addition, because of the use of rare metals, prices and supplies are more stable. There are also some advantages that tantalum electrolytic capacitors do not have.

There are two main advantages. First, it can reduce the mounting area. Because the sheet-shaped multilayer ceramic capacitor has a large electrostatic capacity per unit volume. The other is to reduce the output ripple voltage when used in an output smoothing circuit such as a DC-DC converter. The reason is that the Equivalent Series Resistance (ESR) of the chip multilayer ceramic capacitor is low. When using a tantalum electrolytic capacitor, the output ripple voltage is 56 mV, and when using a chip multilayer ceramic capacitor, it is reduced to 7 mV.