What are the main product characteristics of ceramic chip capacitors

Ceramic chip capacitor is made of high dielectric constant capacitor ceramic barium titanate and titanium oxide extruded into a circular tube, disk or disk as the medium, and silver plated on the ceramic as the electrode by sintering infiltration method. It is divided into high-frequency ceramic capacitor and low-frequency ceramic capacitor.

80% of the capacitors produced in the world are ceramic chip capacitors. About 300-400 capacitors are required for a mobile phone, and about 700-800 capacitors are required for notebook and tablet computers, which contributes greatly to the miniaturization and lightweight of electronic devices.

From the perspective of the structure of ceramic chip capacitors, the main structure of plate ceramic chip capacitors is mainly divided into five parts: ceramic medium, internal electrodeposition, external electrode, nickel layer and tin layer. In terms of structure, this ceramic chip capacitor is a multi-layer stacked structure, achieving miniaturization and space saving, and realizing high-density assembly of circuit substrate.

So, what are the main product characteristics of ceramic chip capacitors?

Rated voltage: there is an upper limit to the voltage that can be applied to the capacitor. The maximum voltage available that can be stably applied to the capacitor is called the rated voltage. The rated voltage is usually expressed by DC voltage, and AC voltage products are also useful.

Leakage current / insulation resistance / insulation breakdown: Although the capacitor cuts off the direct current, it still produces very small leakage current. The value obtained by dividing the current through the capacitor by the voltage applied to the capacitor is called the insulation resistance value. Ceramic capacitors have high insulation resistance and leakage current will not be a problem in general applications. However, if the rated voltage is exceeded and the applied voltage is further increased, the insulation breakdown of the capacitor will eventually occur.

Impedance frequency characteristic: ceramic chip capacitor has the characteristic that the higher the frequency, the easier to pass. In an actual capacitor, the impedance value is infinitely close to zero with the increase of frequency, but in an actual capacitor, the impedance will rise with the increase of frequency. The results show that the impedance frequency characteristic of the signal is a V-shaped (or U-shaped) curve.