How to avoid the failure of metallized film capacitor

The metallized film capacitor has outstanding characteristics, good temperature characteristics and high capacity density, but it may cause burning and bursting when used incorrectly. The following method avoids problems with metallized film capacitors.

1. Choose a good quality product. The performance of metallized film capacitors is not good, the reliability is very low, and it is very easy to fail. Therefore, choosing the right and appropriate product is the primary condition for ensuring reliability. A poor quality metallized film capacitor can cause problems if it is mounted on a circuit. If the quality of the product is not guaranteed, do not use metallized film capacitors, especially in DC-DC circuits and high-power charge and discharge circuits.

2. Low impedance circuits use failures caused by excessive voltages. There is no guarantee that the circuit used will have a resistor-protected circuit and a low-impedance circuit without resistance protection. With a resistor-protected circuit, the resistor acts as a step-down and suppresses the passage of large currents.

3. There is no problem with circuit design and product selection. The performance parameters of metallized film capacitor products can meet the circuit signal characteristics. However, there is usually no guarantee that the above two tasks will be done in place, and failures are likely to occur during use.

I hope that the content of this article can help everyone.