为了满足电子产品向高速化、小型化和低成本方向发展的需要，贴片式电容器也在迅速的发展，其中贴片电容是SMT贴片加工中使用最多的一种元器件，在线路板中发挥自己的作用，保证使用安全。那么贴片电容的技术指标又有哪些呢？

　　In order to meet the needs of high-speed, miniaturization and low-cost development of electronic products, SMT capacitor is also developing rapidly. SMT capacitor is one of the most used components in SMT chip processing, which plays its own role in the circuit board to ensure the safety of use. What are the technical specifications of SMC?

　　1、温度系数Temperature coefficient

　　电容值随温度的变化情况。一定温度范围内，温度每上升一摄氏度，电容值的相对变化值。对于贴片电容来说，温度系数越小越好。

　　The change of capacitance value with temperature. Within a certain temperature range, the relative change value of capacitance value for each degree of temperature rise. For chip capacitors, the smaller the temperature coefficient, the better.

　　2、容量与误差Capacity and error

　　标称电容和实际电容之间的最大偏差范围。和电阻器的标识方法相似，常用贴片电容的精度等级一般用英文字母表示。D级，±0.5%；F级，±1%；G级，±2%；J级，±5%；K级，±10%；M级，±20%。

　　The maximum deviation range between the nominal capacitance and the actual capacitance. Similar to the identification method of resistors, the accuracy level of common chip capacitors is generally expressed in English letters. Grade D, ± 0.5%; F, ± 1%; G, ± 2%; J, ± 5%; K, ± 10%; m, ± 20%.

　　3、绝缘电阻Insulation resistance

　　表明漏电大小的指标。容量越小的贴片电容，绝缘电阻越大，漏电量越小。一般在几百兆欧到几千兆欧。一般电解电容的绝缘电阻较小。漏电越小也代表贴片电容的性能越好。

　　An indicator indicating the magnitude of leakage. The smaller the capacitance, the greater the insulation resistance and the smaller the leakage. It's usually in the range of hundreds to thousands. Generally, the insulation resistance of electrolytic capacitor is small. The smaller the leakage, the better the performance of SMC.

　　4、额定工作电压Rated operating voltage

　　在电路中，电容器能长期稳定工作所能承受的最大直流电压。对于其他条件都相同的贴片电容，额定工作电压越高，体积也越大。

　　In the circuit, the maximum DC voltage that the capacitor can withstand when it can work stably for a long time. The higher the rated working voltage, the larger the volume of SMC.

　　5、损耗Loss

　　在电路中，每个贴片电容因为发热而消耗的能量。一般来自于介质损耗和金属损耗。

　　In a circuit, the energy consumed by each chip capacitor due to heating. It usually comes from dielectric loss and metal loss.

　　6、频率特性Frequency characteristics

　　在不同电场频率下贴片电容数值随之变化的特性。在高频电路工作的电容器，因为介电常数的改变，电容值会相应减小，损耗随频率增加而增加。在高频电路中工作时，贴片电容自身的基片电阻、电感等因素都会影响其性能。这也使得在选用贴片电容的时候需要考虑电路板的频率特性。

　　The characteristic of chip capacitance changing with the change of electric field frequency. Because of the change of dielectric constant, the capacitance value of the capacitor in high frequency circuit will decrease correspondingly, and the loss will increase with the increase of frequency. When working in high frequency circuit, the substrate resistance and inductance of SMC will affect its performance. This also makes it necessary to consider the frequency characteristics of the circuit board when selecting chip capacitors.

　　7、存储时间Storage time

　　对于很稳定的电容器来说，电容值随储存时间的变化不大。但是对于一些不稳定的电容器来说，每存放1000小时电容值的变化量可以高达5%~10%。但这类变化是可逆的，在使用前将电容器在150℃的环境中预热1小时，电容值就会恢复正常。

　　For a very stable capacitor, the capacitance value changes little with the storage time. However, for some unstable capacitors, the variation of capacitance value can be as high as 5% ~ 10% every 1000 hours. However, this kind of change is reversible. If the capacitor is preheated at 150 ℃ for 1 hour before use, the capacitance value will return to normal.

　　熟悉了电容器的各种特性以及选用贴片电容的技术指标，在选用贴片电容是就不会只考虑价格和体积，而导致电容器选用错误，进而影响整个电路的的性能。

　　Familiar with the various characteristics of capacitors and the technical indicators of selecting chip capacitors, when selecting chip capacitors, we will not only consider the price and volume, which will lead to the wrong selection of capacitors, and then affect the performance of the whole circuit。