The FET or field effect transistors are classified as JFET or junction field effect transistor and MOSFET or metal oxide semiconductor field effect transistor. The metaloxidesemiconductor field-effect transistor ( MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET), most commonly fabricated by the controlled oxidation of silicon. BJT or the bipolar junction transistors are classified as NPN and PNP transistors. Note: We have two types of transistors – BJT and FET. Integrated circuit (IC) a small electronic circuit printed on a chip (usually made of silicon) that contains many its own circuit elements (e.g. Since transistors are small and produce less heat waste these are preferred for small electrical circuits. Transistors have higher efficiency than vacuum tubes.Ħ). Multiple transistors can be combined into a single logic gate that compares input currents and produces a single output according to the specified logic. Transistors consume low power, less heat waste while the vacuum tubes need more power.Ĥ). Transistors are active components that control, generate or amplify electric signals within the circuitry, acting as a switch or gate. Transistors cost lower than the vacuum tubes.ģ). Transistors are smaller than the vacuum tubes.Ģ). It can control the flow of electrons inside and is used as a switch and amplifier in electric equipment.īecause of the many advantages of transistors over the vacuum tubes nowadays, transistors are used.Īdvantages of transistors over vacuum tubes are-ġ). One terminal is called the control terminal because the voltage in this terminal controls the resistance between the remaining two terminals.Ī vacuum tube is a sealed glass tube inside of which is in near vacuum condition and allows the controlled passage of electric current. Transistors have very high input resistance and very low output resistance. This is because it transfers the resistance from one end of the device to the other end or we can say, transfer of resistance. The word transistor is a combination of transfer and resistance.
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