Function of transistor

The SMD transistor and the plug-in transistor are the same, except that the packaging is different. The patch is smaller, saves space and eliminates manual plug-ins.

SMD transistor

SMD transistor

Plugins are generally packaged in TO-92 packages, while patches are generally packaged in SOT-23 packages. The amplification parameters for both are basically the same.

Functionally, the use of the three stage tube is the same regardless of the patch or plug-in:

1. Signal amplification (working in the amplification area)

2. Switch (operating in saturation and cutoff region