（CL=6pF 32MHz 贴片晶振SMD2016频率牵引值）

把直插无源晶振换成贴片无源晶振可以吗？

I am thinking of changing an existing design from THT crystals to SMD crystals – what do I need to consider?

我在考虑把直插无源晶振换成贴片无源晶振，有什么需要考虑吗？

This depends upon the application. For example, if the crystal is pullable i.e. the frequency can be changed by varying the load capacitance of the crystal by electrical means, then this may be difficult to achieve. For example strip blank SMD crystals have a very much lower pullability than the HC49 style round blank package.

这取决于具体应用。如果是音频设备，很可能对频率拉伸有特殊要求。晶体频率具备一定拉伸性，即可以通过改变晶体的负载电容来改变其频率。SMD晶振内置晶片频率拉伸值远低于HC-49封装的晶体谐振器。

（CL=19pF 24.576MHz直插晶振HC-49US频率牵引值）