Choosing an inappropriate capacitor will affect the circuit and cause unnecessary losses. The following introduces the parameters that should be paid attention to when purchasing thin film capacitors.

1. Rated voltage

Rated voltage refers to the voltage value applied across the capacitor that the film capacitor can work normally, stably and reliably within a certain period of time in the circuit. The rated voltage is not only related to the dielectric used by the capacitor, but also related to the environment in which the capacitor is located. As frequency and temperature increase, the rated voltage will decrease. Therefore, when choosing a film capacitor, you should pay attention to the rated voltage of the capacitor. If the temperature rises significantly, the voltage applied across the film capacitor should be reduced accordingly. When choosing a film capacitor, you should choose a capacitor whose rated voltage is slightly higher than the actual demand. To ensure the normal, stable and reliable use of capacitors.

2. Electric capacity

The capacitance of a capacitor refers to the storage capacity of the capacitor for charge. The capacitance is related to whether the capacitor can meet the needs of the circuit. It is to ensure that the circuit can reach the goal determined in the design. When purchasing, choose the capacity required by the circuit. You can choose a larger one, but not too much.

3. Temperature coefficient

The temperature coefficient refers to the ambient temperature range where the capacitor can work stably in the circuit. Generally, the temperature coefficient of the film capacitor is between -65 ℃-+ 250 ℃. A capacitor with a suitable temperature coefficient can be selected according to the temperature of the working environment.

4. Loss

Loss refers to the energy lost by a capacitor due to the heat dissipation per unit time in the circuit. The heat dissipated by the loss of the capacitor will cause the temperature of the capacitor itself to rise, and some of the heat will be dissipated into the surrounding environment. When buying, you should try to choose thin film capacitors with small loss. Capacitors store more charge in capacitors, instead of converting electrical energy into thermal energy for useless work.

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