Apr. 23, 2023
Ceramic capacitors are one of the most common types of capacitors. They are usually used in circuits for DC blocking, decoupling (bypass), coupling, and filtering. What factors will affect the normal use of ceramic capacitors?
The effect of humidity on the deterioration of electrical parameters:
When the humidity in the air is too high, the water film condenses on the surface of the capacitor shell, which can reduce the surface insulation resistance of the capacitor. In addition, for semi-sealed capacitors, moisture can also penetrate into the interior of the ceramic capacitor dielectric, reducing the insulation resistance of the capacitor dielectric.
Breakdown mechanism of ceramic capacitors at high temperature:
When semi-hermetic ceramic capacitors work under high humidity conditions, breakdown failure is a common and serious problem. Electrolytic aging breakdown of ceramic capacitors has become a fairly common problem due to silver migration in ceramic capacitors. Thermal breakdown mostly occurs in small tubular or disc-shaped ceramic dielectric capacitors, because local heating is severe during breakdown, and thinner tube walls or smaller porcelain bodies are easy to burn or break.
Fracture of laminated ceramic capacitors:
Since the laminated ceramic capacitor is directly soldered on the circuit board, it directly bears various mechanical stresses from the circuit board, while the leaded ceramic capacitor can absorb the mechanical stress from the circuit board through the pins.
The above three factors will have an impact on the normal use of ceramic capacitors. In fact, no matter what product it is, it must work in an environment suitable for it, especially some precision instrument products need to pay more attention to changes in the use environment, so as to make the best of the product performance.
We're JYH HSU(JEC) Electronics Ltd, a Chinese manufacturer of of capacitors and resistors. We're one of largest manufacturers in China in terms of yearly safety capacitor (X2, Y1, Y2) production. Welcome to contact us if you need electronic components.
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