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This post provides a detailed information about PNP Transistor, how PNP transistor works, its characteristics, applications, advantages and disadvantages.A PNP Transistor is a type of Bipolar Junction Transistor which is composed of three layers where ‘N’ doped layer is sandwiched between two ‘P’ doped layers. Electrons travel slowly in a semiconductor and holes move more slowly than electrons. It means that, if the Base voltage is zero or less than 0.7 V, the current cannot flow and it acts as an open circuit. How PNP Transistor Works. Working of PNP Transistor. The Collector region collects most of all charge carriers emitted from the Emitter. The area of the Emitter and Collector layer is more compared to the Base layer.In N-type semiconductors, a large number of free electrons are available. PNP transistor works when the emitter-base junction is forward biased while collector-base junction is reverse biased.
Therefore, almost all holes of Emitter will cross the depletion region and enter into the Base layer.Because of the movement of holes, the current will flow through the Emitter-Base junction. So, Base voltage is a minimum of 0.7 V in reverse bias to conduct the transistor.It means that, if the Base voltage is zero or less than 0.7 V, the current cannot flow and it acts as an open circuit.To turn ON the transistor, the Base voltage must more than 0.7 V. In this condition, the transistor acts as a close switch.The main differences when comparing PNP transistors vs NPN transistors have been summarized in the table below:Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering.We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. This allows more carriers to reach the Collector which in turn increases the current flow from Emitter to Collector. It has two The small Base current has the ability to control large Emitter current, as it is current controlled device. Only a few donor or acceptor atoms are required to produce changes in the resistivity of a semiconductor.PNP Transistor works when Base Emitter junction is The Base Collector region is reverse biased which uses external voltage source. In this switching, base current flows when the base voltage is more negative. Therefore, the depletion region at both junctions is more penetrate towards the Base layer.
The working of PNP transistor switching circuit is same like NPN transistor switching circuit expect that current flows from the base. While the Collector-Base junction is in reverse bias and hence the depletion region at Collector-Base junction is wide.The Emitter-base junction is in forward bias.
The two important characteristics of a PNP Transistor are:In Common-Base Configuration, for various constant values of Output Voltage (VThe figure below shows approximated plot for Input Characteristics.
These holes constitute the emitter current.
A PNP Transistor is considered ‘ON’ when the Source Voltage connected to the Base is low and turned ‘OFF’ when it is high.
To understand the working of a Transistor, it is necessary to know the characteristics of semiconductors.
The Collector current (IThe circuit of the PNP transistor is as shown in the below figure.If we compare the circuit of PNP transistor with NPN The current flow is due to the movement of holes.
A PNP Transistor is considered ‘ON’ when the Source Voltage connected to the Base is low and turned ‘OFF’ when it is high.To understand the working of a Transistor, it is necessary to know the characteristics of semiconductors.The fourth column of the periodic table contains certain elements which behave like both conductors and insulators under controlled conditions. It also implies that reducing forward bias voltage decreases the current flow.The relationship between DC currents and voltages are represented graphically, which are known as characteristics. Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering
This constitutes current ( Ie). P type semiconductor contains holes and This holes going to transfer to the base. similarly, when the switch is ON, the current will flow through the circuit and act as a close circuit.The transistor is nothing but a power electronics switch that can work like normal switches.
This post provides a detailed information about PNP Transistor, how PNP transistor works, its characteristics, applications, advantages and disadvantages.A PNP Transistor is a type of Bipolar Junction Transistor which is composed of three layers where ‘N’ doped layer is sandwiched between two ‘P’ doped layers. Electrons travel slowly in a semiconductor and holes move more slowly than electrons. It means that, if the Base voltage is zero or less than 0.7 V, the current cannot flow and it acts as an open circuit. How PNP Transistor Works. Working of PNP Transistor. The Collector region collects most of all charge carriers emitted from the Emitter. The area of the Emitter and Collector layer is more compared to the Base layer.In N-type semiconductors, a large number of free electrons are available. PNP transistor works when the emitter-base junction is forward biased while collector-base junction is reverse biased.
Therefore, almost all holes of Emitter will cross the depletion region and enter into the Base layer.Because of the movement of holes, the current will flow through the Emitter-Base junction. So, Base voltage is a minimum of 0.7 V in reverse bias to conduct the transistor.It means that, if the Base voltage is zero or less than 0.7 V, the current cannot flow and it acts as an open circuit.To turn ON the transistor, the Base voltage must more than 0.7 V. In this condition, the transistor acts as a close switch.The main differences when comparing PNP transistors vs NPN transistors have been summarized in the table below:Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering.We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. This allows more carriers to reach the Collector which in turn increases the current flow from Emitter to Collector. It has two The small Base current has the ability to control large Emitter current, as it is current controlled device. Only a few donor or acceptor atoms are required to produce changes in the resistivity of a semiconductor.PNP Transistor works when Base Emitter junction is The Base Collector region is reverse biased which uses external voltage source. In this switching, base current flows when the base voltage is more negative. Therefore, the depletion region at both junctions is more penetrate towards the Base layer.
The working of PNP transistor switching circuit is same like NPN transistor switching circuit expect that current flows from the base. While the Collector-Base junction is in reverse bias and hence the depletion region at Collector-Base junction is wide.The Emitter-base junction is in forward bias.
The two important characteristics of a PNP Transistor are:In Common-Base Configuration, for various constant values of Output Voltage (VThe figure below shows approximated plot for Input Characteristics.
These holes constitute the emitter current.
A PNP Transistor is considered ‘ON’ when the Source Voltage connected to the Base is low and turned ‘OFF’ when it is high.
To understand the working of a Transistor, it is necessary to know the characteristics of semiconductors.
The Collector current (IThe circuit of the PNP transistor is as shown in the below figure.If we compare the circuit of PNP transistor with NPN The current flow is due to the movement of holes.
A PNP Transistor is considered ‘ON’ when the Source Voltage connected to the Base is low and turned ‘OFF’ when it is high.To understand the working of a Transistor, it is necessary to know the characteristics of semiconductors.The fourth column of the periodic table contains certain elements which behave like both conductors and insulators under controlled conditions. It also implies that reducing forward bias voltage decreases the current flow.The relationship between DC currents and voltages are represented graphically, which are known as characteristics. Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering
This constitutes current ( Ie). P type semiconductor contains holes and This holes going to transfer to the base. similarly, when the switch is ON, the current will flow through the circuit and act as a close circuit.The transistor is nothing but a power electronics switch that can work like normal switches.