Chip capacitors are commonly used components at present. The patches produced include different specifications such as NPO, X7R, Z5U, and Y5V. Different specifications have different uses.
In the process of use, I often encounter various problems. This article focuses on the failure of the chip capacitor, analyzes the reasons for the product and hopes to help solve the doubts.
The most important failure mode of chip capacitors - break
The common failure of chip capacitors is breakage, which is determined by the brittleness of the chip capacitor's own dielectric. Since the chip capacitors are soldered directly to the board, they directly withstand various mechanical stresses from the board, while leaded ceramic capacitors The mechanical stress from the board can be absorbed through the pins. Therefore, for the chip capacitor, the mechanical stress caused by the difference in thermal expansion coefficient or the bending of the board will be the most important factor for capacitor breakage.
After the capacitor is mechanically broken, the electrode insulation spacing at the break will be lower than the breakdown voltage, causing an arc discharge between the two or more electrodes to completely damage the capacitor.