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Compare P.N.P and N.P.N transistor.
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Parameter
PNP transistor
NPN transistor
Definition
Two blocks of p- types semiconductors are separated by one thin block of n-type semiconductor.
Transistor in which two ntype layer are separated by one P-type layer
Symbol
image
image
Direction of Current
Emitter to Collector
Collector to Emitter
Majority Charge Carrier
Holes
Electrons
Switching Time
Slower
Faster
Positive Voltage 
Emitter Terminal
Collector Terminal
Ground Signal
High
Low
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