Difference between BJT and Power MOSFET
In this article we will learn about the basic difference between BJT and Power MOSFET . We will also understand that how many type of layer in BJT and MOSFET. We will know that Power MOSFET as a switich working. We will study about the BJT (Biopolar Junction Transistor) .
BJT and MOSFET as a Switch Workng.
Now we are going to know that how BJT and Power MOSFET work as a switch.
The switching characteristic of power MOSFET is influenced largely by the internal capacitance of the device and the internal impedance of gate drive circuit.
In electronic circuits where switching speed should be high the BJT is used as switching element.
Difference between BJT and Power MOSFET
| Power MOSFET | |
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This is Bipolar junction transistor having three terminals. Base, Emitter and Collector. |
This is basic metal oxide semiconductor field effect transistor. Which having four terminal (a) Gate (b) Drain (c) Source (d) Substrate. |
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.It may be in two types (a) NPN type (b) PNP type |
This may the classified into four types (a) n-channel enhancement type (b) p-channel enhancement type (c) n-channel, deflection type (d) p-channel,defelection types |
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This is used as a switch and constructed of germanium or Silicon semiconductor. |
The MOSFET is used as the two terminal resistor and constructed of layer of metal oxide and semiconductor these are difference between bjt and power mosfet. |
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This operates in three regions. (a) Saturation (b) Active (c) Cut-off |
The MOSFET operate in two regions. (a) Enhancement Type (b) Depletion Type |
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Input Impedance of BJT is low.
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Power MOSFET has high input impedance (mega ohm). It is also difference between BJT and Power MOSFET. |
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BJT has higher switching losses but lower conduction loss. |
Power MOSFET has lower switching losses but it’s on –resistance and conduction losses are more. |
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BJT at lower operating frequencies. |
Power MOSFET at higher operating frequencies. |
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BJT is current controlled device. |
Power MOSFET is voltage control device. |
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BJT has negative temperature coefficient. |
Power MOSFET has positive temperature coefficient. |
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BJT, secondary breakdown does occur. |
Power MOSFET, secondary breakdown does not occur. |
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BJT is in lower voltage ratings. |
Power MOSFET is in higher voltage ratings. |
Hence, these are some differences between BJT and Power MOSFET. If you will find any incorrect in above article you comment below in comment box.