A transistor is also called a semiconductor transistor. Since it operates at the same time as both electron and hole carriers in the semiconductor, it is a bipolar device, also called a bipolar junction transistor.
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There are many kinds of crystal transistors and they can be divided into different types according to different principles:
1. According to the different semiconductor materials can be divided into silicon tube, helium tube.
The neon tube has a lower operating voltage and a lower saturation voltage drop than the silicon tube. The silicon triode has a smaller reverse leakage current than the germanium tube, the output characteristics are flat, the withstand voltage is relatively high, and the temperature characteristics are good.
2. According to the power divided into small power tube, medium power tube and high power tube.
Under normal circumstances, a transistor with a maximum collector dissipation power PCM below 1 W is called a low power transistor; a transistor with a maximum collector dissipation power PCM between 1 and 10 W is called a middle power transistor; Diodes that allow dissipation of power PCMs above 10W are called high power transistors.
3. There are high-frequency and low-frequency tubes according to frequency.
Features frequency less than 3MHz for the low-frequency tube; greater than 3MHz for the high-frequency tube.
4. According to the manufacturing process, there are alloy tubes and flat tubes.
5. According to the conductivity type, it can be divided into NPN type and PNP type.