Leaded ceramic capacitors

Compared with common MLCC, leaded ceramic capacitors have basically the same internal structure. Although they are only packaged differently, they have unique features and applications, especially when dealing with noise countermeasures, substrate bending countermeasures, and noise from DC motors. Suppression has played a role, let's introduce it below.

A leaded ceramic capacitor is a radial leaded ceramic capacitor. It is coated with a resin coating after soldering two wires to the external electrodes of the MLCC. This capacitor not only has the special characteristics of MLCC, but also blends the wires. The effect of reducing the mechanical and thermal load, and the insulation and humidity insulation effects brought by the resin coating.

The stress caused by the bending of the substrate can cause cracks in the solder joints of the device, especially the dielectric ceramics as the MLCC capacitor element body. Although its resistance to compressive stress is strong, its resistance to tensile stress is weak, and the packaging part The substrate bending stress causes cracks in the capacitor element body itself. The crack of the capacitor element body will lead to a decrease in performance when the open circuit is not good, and it will cause heat, smoke, fire, etc. when the short circuit is not good.

In automotive electronic devices that are subject to mechanical loads such as vibration and shock, and thermal loads caused by drastic temperature changes, the solution to such substrate bending problems is to replace MLCCs with leaded ceramic capacitors. Ceramic capacitors with wires can also maintain high reliability in equipment where frequent shocks such as keyless start and smart start occur.

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