The types, specifications and models of capacitors are relatively complex electronic components, which are designed to adapt to different working environments and different circuits. Even capacitors with the same capacity and rated voltage also have a variety of types and material characteristics. If the capacitor fails, the usual solution is to replace it with a new capacitor of the same specification. But what if we can't find a capacitor of the same specification?
要注意不同属性电容的更换，例如：陶瓷电容器和纸介电容要相互更换，则一定要在容量、耐压、不限体积的条件下进行。此外，我们也要考虑更换的费用，把价格计算进去。当然在没有条件限制，同容量高耐压电容可以替代耐压低的电容，误差小的电容可以替代误差大的电容。
Pay attention to the replacement of capacitors with different properties. For example, if ceramic capacitors and paper capacitors are to be replaced with each other, they must be carried out under the conditions of capacity, withstand voltage and unlimited volume. In addition, we should also consider the cost of replacement and take the price into account. Of course, without restrictions, high voltage withstand capacitors with the same capacity can replace low voltage withstand capacitors, and capacitors with small errors can replace capacitors with large errors.
当然除了不同电容之间的替代，我们还要考虑到耐压值、容值、耐温、尺寸、类型等参数。
Of course, in addition to the substitution between different capacitors, we should also consider the withstand voltage value, capacitance value, temperature resistance, size, type and other parameters.
1、若耐压不同，电容种类及其他参数均相同，则高耐压电容可替代耐压低的电容，100V的电容器就可以取代50V的电容器，且耐压余量较大，使用更安全。有一点要注意：同一种电容，耐压值越高电容尺寸就会越大，我们在选择高耐压电容器的时候也要想到尺寸是不是符合要求。
If the withstand voltage is different, the type of capacitor and other parameters are the same, then the high withstand voltage capacitor can replace the low withstand voltage capacitor, and the 100V capacitor can replace the 50V capacitor, and the withstand voltage margin is larger, which is safer to use. One thing to note: for the same capacitor, the higher the withstand voltage value, the larger the capacitor size will be. We should also consider whether the size meets the requirements when selecting high withstand voltage capacitors.
2、电容种类很多，常见的是电解电容、薄膜电容、超级电容。电容的作用方式也不一样，就连电解电容、钽电容也需要区别。各种电容，在某些应用中是无法替代的。例如单相交流电动机上接的启动电容，不能用普通CBB22电容代替，不同类型的电容，尽量不要更换。
There are many kinds of capacitors, including electrolytic capacitors, thin film capacitors and super capacitors. Capacitors work in different ways. Even electrolytic capacitors and tantalum capacitors need to be distinguished. Various capacitors are irreplaceable in some applications. For example, the starting capacitor connected to a single-phase AC motor cannot be replaced by an ordinary CBB22 capacitor. Try not to replace different types of capacitors.
3、耐压选择一定要留下足够的余量，为了使电容能够可靠、稳定地工作，电容的耐压性一定要大于工作电压的1.5倍。
The selection of withstand voltage must leave enough margin. In order to make the capacitor work reliably and stably, the withstand voltage of the capacitor must be greater than 1.5 times the working voltage.
4、普通电容误差范围为±5%(J)、±10%(K)，若电路对电容容量精度标准极低，可采用不同误差范围的电容。若电路对电容精度有较高的标准，则只能采用容量误差小的电容。
The error range of ordinary capacitance is ± 5% (J), ± 10% (k). If the accuracy standard of capacitance of the circuit is very low, capacitors with different error ranges can be used. If the circuit has a high standard for capacitor accuracy, only capacitors with small capacity error can be used.
5、不同稳定的替换。为了使电容能够可靠稳定地工作，有必要在电容的耐温性上留下一定的余量。如果工作环境温度高于60℃，最好选择105℃耐温电容。如果电路温度不高，可以用不同的耐温电容代替。
Different stable replacement. In order to make the capacitor work reliably and stably, it is necessary to leave a certain margin on the temperature resistance of the capacitor. If the working environment temperature is higher than 60 ℃, it is best to choose 105 ℃ temperature resistant capacitor. If the circuit temperature is not high, different temperature resistant capacitors can be used instead.
总而言之，电容的替代品可以找更高品质的电容替代是可以的。
In a word, it is possible to find a higher quality capacitor as a substitute for capacitors.
