What are the areas of operation for a transistor switch?

The areas of operation for a transistor switch are known as the Saturation Region and the Cut-off Region.

Can a transistor be used as a solid state switch?

A transistor can be used as a 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. The transistor operates as a Single Pole Single Throw (SPST) solid state switch.

Why do we use multiple switching transistors in bipolar transistors?

Sometimes the DC current gain of the bipolar transistor is too low to directly switch the load current or voltage, so multiple switching transistors are used. Here, one small input transistor is used to switch “ON” or “OFF” a much larger current handling output transistor.

What type of transistor is used in motor control circuit?

We can use any transistor according to power rating of the motor. In conclusion, if a control signal at the base input is 0 volts. It will provide an ON signal. Because we use a PNP switch in this example circuit. Similarly, it will remain off, its control signal is logic HIGH.

What is a “Darlington transistor switch”?

As well as its high power and voltage switching capabilities, a “Darlington Transistor Switch” has another benefit in its high switching speeds, making it ideal for use in inverter circuits, lighting circuits and DC motor or stepper motor control applications.

What is the output voltage of a silicon transistor at 5V?

For silicon transistor, V BE = 0.7 V Therefore, as the base current is greater than 56.8 micro ampere current, the transistor will be driven to saturation i.e., it is fully ON, when 5V is applied at the input. Thus, the output at the collector becomes approximately zero.