供应日通工薄膜电容器,FPA22W684KR

品牌：日通工 Nitsuko

型号：FPA22W684KR

 
电容：0.68μF
 
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）

知识点：

从原理上分析，金属化薄膜电容应不存在短路失效的模式，而金属箔式电容器会出现很多短路失效

的现象。金属化薄膜电容器虽有上述巨大的优点，但与金属箔式电容相比，也有如下两项缺点：

一是容量稳定性不如箔式电容器，这是由于金属化电容在长期工作条件易出现容量丢失以及自愈后

均可导致容量减小，因此如在对容量稳定度要求很高的振荡电路使用，应选用金属箔式电容更好。

另一主要缺点为耐受大电流能力较差，这是由于金属化膜层比金属箔要薄很多，承载大电流能力较

弱。为改善金属化薄膜电容器这一缺点，目前在制造工艺上已有改进的大电流金属化薄膜电容产品

，其主要改善途径有：
用双面金属化薄膜做电极；
增加金属化镀层的厚度；
端面金属焊接工艺改良，降低接触电阻。

Knowledge points:

In principle, there should be no short-circuit failure mode for metallized film capacitors, and there will be many short circuit failures in metal foil capacitors.

The phenomenon. Although metallized film capacitors have these great advantages, there are two disadvantages compared with metal foil capacitors.

First, the capacity stability is not as good as that of foil capacitors. This is because metallized capacitors are prone to loss of capacity and self healing after long term working conditions.

It can lead to reduced capacity. Therefore, if the oscillation circuit with high capacity stability is required, the metal foil capacitor should be used better.

Another main drawback is poor tolerance to high current. This is because the metallized film is much thinner than the metal foil, and the load current capacity is higher than that of the metal foil.

Weak. In order to improve the disadvantage of metallized film capacitors, large current metallized film capacitor products have been improved in manufacturing technology.