日通工小型金属膜电容器,FPA22W474KR

品牌：日通工 Nitsuko

型号：FPA22W474KR

 
电容：0.47μF
 
电压：450V

使用温度范围：-40~+85°C（+105°C）+85°C

静电容量许容差：±10%（K）

其结构和纸介电容相同，介质是涤纶或者聚苯乙烯等。涤纶薄膜电容，介电常数较高，体积小

，容量大，稳定性比较好，适宜做旁路电容。聚苯乙烯薄膜电容，介质损耗小，绝缘电阻高，

但是温度系数大，可用于高频电路。

特性总结：薄膜电容的容量范围为3pF-0.1μF ，直流工作电压为 63-500V, 适用于高频、低频，

漏电电阻 大于10000 Ω。

这得从电容器的结构上说起。最简单的电容器是由两端的极板和中间的绝缘电介质（包括空气）

构成的。通电后，极板带电，形成电压（电势差），但是由于中间的绝缘物质，所以整个电容器

是不导电的。不过，这样的情况是在没有超过电容器的临界电压（击穿电压）的前提条件下的。

我们知道，任何物质都是相对绝缘的，当物质两端的电压加大到一定程度后，物质是都可以导电

的，我们称这个电压叫击穿电压。电容也不例外，电容被击穿后，就不是绝缘体了。不过在中学

阶段，这样的电压在电路中是见不到的，所以都是在击穿电压以下工作的，可以被当做绝缘体看。

This has to be said from the structure of the capacitor. The simplest capacitors are the 

polar plates and the intermediate insulating dielectric (including air) at both ends.

It is made up of. After energizing, the plate is electrified to form a voltage (potential 

difference), but because of the insulating material in the middle, the entire capacitor 

is formed.

It's not conductive. However, this situation is not in excess of the critical voltage 

(breakdown voltage) of the capacitor.

We know that any substance is relatively insulated. When the voltage at both ends of 

the material is increased to a certain extent, matter can conduct electricity.

Well, we call this voltage called breakdown voltage. Capacitors are no exception. 

Capacitors are not insulators after breakdown. But in middle school

At this stage, such a voltage is not seen in the circuit, so it works under the breakdown 

voltage and can be regarded as an insulator.