SMD capacitor category introduction

SMD capacitors include ceramic capacitors, tantalum capacitors, and aluminum electrolytic capacitors.

Ceramic capacitors have no polarity and small capacity. Generally, they can withstand very high temperatures and voltages, and are often used for high-frequency filtering.

Tantalum capacitors are characterized by long life, high temperature resistance, high accuracy, and excellent performance in filtering high-frequency waves. However, the capacity is smaller, the price is more expensive than aluminum capacitors, and the withstand voltage and current capabilities are relatively weak. It is used in small-capacity low-frequency filter circuits.

Compared with ceramic capacitors, SMD tantalum capacitors have capacitance and withstand voltage marks on their surface, and their surface colors are usually yellow and black. For example, 100-16 means the capacity is 100μF and the withstand voltage is 16V.

Aluminum electrolytic capacitors have a larger capacity than SMD tantalum capacitors. They are more commonly found on graphics cards, with a capacity between 300μF and 1500μF. They are mainly used for filtering and stabilizing current at low frequencies.

According to different withstand voltages, it can be divided into four series: A, B, C, and D as follows:

Type package form withstand voltage

A 3216 10V

B 3528 16V

C 6032 25V

D 7343 35V

Aluminum capacitors have large capacity and low price, but they are easily affected by temperature and have low accuracy; and they will gradually fail over time.

Tantalum capacitors have long life, high temperature resistance, and high accuracy, but their capacity is small and the price is high. Unless it is a place that needs large-capacity filtering, in principle, choose to use tantalum capacitors, because it is not easy to cause waveform distortion.

The full name of solid capacitors is: solid aluminum electrolytic capacitors. It is obviously different from ordinary capacitors (ie, liquid aluminum electrolytic capacitors) in that it uses different dielectric materials. The dielectric material of liquid aluminum capacitors is electrolyte, while the dielectric material of solid capacitors is conductive polymer.

Benefits of using solid capacitors: explosion-proof slurry

The second advantage of using solid capacitors: long life and good stability