- #1
Femme_physics
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The formulas in question are:
Beta = Ic/Ib
Ie = Ib ( 1 + beta )
Ie = Ib + Ic
Beta = Ic/Ib
Ie = Ib ( 1 + beta )
Ie = Ib + Ic
Does PNP transistor share the same formulas as an NPN transistor?
- Thread starter Femme_physics
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- Formulas Npn Transistor
In summary, the conversation discusses the differences between PNP and NPN transistors, including their current flow direction, equations, interchangeability, and use in circuits. PNP and NPN transistors have opposite current flow directions and use different equations. They cannot be used interchangeably in circuits as it can lead to incorrect predictions. However, the same circuit can be used for both types of transistors with reversed current flow direction and power supply polarity. The choice between PNP and NPN transistors depends on the desired outcome and the type of circuit. It is important to understand their differences and equations to make an informed decision.
- #2
Kholdstare
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Yes, of course. Though the polarity is reversed. The terminals are named such that those equations are obeyed for both pnp and npn transistors.
- #3
Femme_physics
Gold Member
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Ahh...got it, so really the only difference is that +Vbe in NPN becomes +Veb in PNP
Thanks
Thanks
- #4
sophiecentaur
Science Advisor
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You could ask yourself why the equations shouldn't apply. If you can't come up with a good reason then they would apply.
- #5
Jony130
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This diagram show everything
- #6
Femme_physics
Gold Member
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Thanks for the validation :)
1. What is the difference between a PNP and NPN transistor?
The main difference between a PNP and NPN transistor is the direction of the current flow. In a PNP transistor, the current flows from the emitter to the collector, while in an NPN transistor, the current flows from the collector to the emitter.
2. Do PNP and NPN transistors have the same formulas?
No, PNP and NPN transistors do not share the same formulas. The equations used to calculate the characteristics and behavior of PNP and NPN transistors are different due to their opposite current flow direction.
3. Are the equations for PNP and NPN transistors interchangeable?
No, the equations for PNP and NPN transistors are not interchangeable. Using the wrong equations for a particular transistor type can result in incorrect calculations and predictions of its behavior.
4. Can the same circuit be used for both PNP and NPN transistors?
Yes, the same circuit can be used for both PNP and NPN transistors. However, the direction of the current flow and the polarity of the power supply must be reversed for the PNP transistor compared to the NPN transistor.
5. How do I know which type of transistor to use in a circuit?
The choice between using a PNP or NPN transistor depends on the type of circuit and the desired outcome. PNP transistors are commonly used in high-side switching and amplification, while NPN transistors are often used in low-side switching and amplification. It is important to understand the differences between the two types of transistors and their respective equations to make an informed decision.
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