The transistor module includes bipolar transistor module, metal-oxide-semiconductor field-effect transistor module, insulated-gate bipolar transistor (IGBT) module, etc. It can be used as a variable switch, controlling the current flowing out based on the input voltage or current. Therefore, the transistor module can act as a current switch, and the switching speed can be extremely fast. As a solid semiconductor device, the transistor module can be widely applied in demodulation, rectification, amplification, switching, voltage regulation, signal modulation and many other fields.