Huntron TRACKER 2700 - 6-2. Transistors

6-
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6-2. Transistors
A bipolar transistor is a three layer device. There are two basic types. A PNP transistor has a
layer of n-type silicon material sandwiched between two layers of p-type material. An NPN
transistor has a layer of p-type silicon material sandwiched between two layers of n-type
material. Figure 6-19 shows the relationship between type of material and circuit symbol for a
PNP and a NPN transistor.
Figure 6-19. Diagram of an NPN and PNP Bipolar Transistor
PNP
NPN
E
E
B B
C
N
P
N
P P N
BASE
COLLECTOR EMITTER COLLECTOR
BASE
EMITTER
C