Parameter
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NPN
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PNP
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Definition
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A lightly doped P type semiconductor material is placed in
between two N type material
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A lightly doped N type semiconductor material is placed in
between two P type material
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Majority charge carriers
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Electrons are the majority charge carriers
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Holes are the majority charge carriers
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Symbol
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|
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Direction of the arrow in the symbol
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The arrow points outside
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The arrow points inside
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Direction of the flow of current
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Electrons flow from emitter to collector
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Holes flow from emitter to collector
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Construction
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|
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Mobility
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Mobility of the electrons is high
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Mobility of the holes is less
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Two diode model
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Commonly used
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NPN transistor is commonly used because of its high
mobility
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PNP is not commonly used because of its low mobility
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Working of the transistor
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|
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Forward biased
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Emitter base junction
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Emitter base junction
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Reverse biased
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Collector base junction
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Collector base junction
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