It was created by William Shockley (who was a physicist of United States of America) in 1947. In today’s tutorial, we will have a look at Transistor as a Switch. The transistor is a 3 pin semiconductor module used for different amplifier and switching circuits. The transistor is fully – ON and operates as closed switch.Hello friends, I hope you all are doing great. The transistor operating in the saturation region exhibits following characteristics −īase – Emitter voltage is greater than cut – in voltage (0.7 V).īoth the base – emitter junction and base – collector junction are forward biased. The collector current I C = 0 A and output voltage V out = V CC. The transistor is fully – off acting as open switch. The V BE is less that cut – in voltage 0.7 V.īoth emitter – base junction and collector – base junction are reverse biased. When transistor operates in the cut off region shows the following characteristics − Circuit Diagram of Transistor as a Switch Cut Off State (Open Switch) Therefore, both the on – state and off – state power loss is zero in the transistor switch. When the transistor operating as switch, in the cut off region the current through the transistor is zero and voltage across it is maximum, and in the saturation region the transistor current is maximum and voltage across is zero. ![]() If a positive signal applied at the input terminal then it acts like a closed switch. ![]() When a zero input signal applied to the base of the transistor, it acts as an open switch. The transistor operates as a Single Pole Single Throw (SPST) solid state switch. If the transistor is operated in the saturation region then it acts as closed switch and when it is operated in the cut off region then it behaves as an open switch. A transistor can be used as a solid state switch.
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