What are the functions of SMD transistor?

Amplification is the most basic function of the patch transistor, which can increase some relatively weak current signals to a certain extent.

Let's talk about it in detail below.

An important parameter of the triode is the current amplification factor β. When a tiny current is added to the base of the triode, a current that is β times the injection current can be obtained on the collector, that is, the collector current. 

A small change in the current can cause a large change in the collector current, which is the amplification effect of the patch transistor.

The triode can also be used as an electronic switch, and can also be used as an oscillator with other electronic components. When replacing, you must understand the performance of the original tube, such as whether it is a general-purpose triode or a switching triode, structure or a master with special requirements

For parameters, when looking for the same performance structure and similar parameters to replace, also need to pay attention to the operating frequency. Choose the one that meets the working frequency requirements.