the npn transistor as a circuit element. collector base emitter “tin can” transistors replace...
TRANSCRIPT
The NPN transistor as a circuit element
CollectorBase
Emitter
“Tin Can”
Transistors Replace Mechanical SwitchesTransistors Replace Mechanical Switches
NPN-Transistor
The 1960’s transistorThe 1960’s transistor
Collector OR Drain
Base OR Gate Emitter OR
Source
The “Tin Can”
NPN-Transistor
Transistors are constructed differently and this fact is reflected in the names that are given to the pins. As a first pass at this technology, it will not hurt to associate the names in pairs.
However, ultimately the operational principles for the pins with similar names is not the same for different types of transistors.
it isn’t tin and it isn’t a can!
Collector
Base
Emitter
Silicon structure with extra electrons in its structure
Silicon structure with extra electrons in its structure
Silicon structure with a shortage of electrons in its structure
n-type material
p-type material
Bipolar Junction TransistorBipolar Junction Transistor
NPN-Transistor
n p n
Collector
Emitter
Base
negativeterminal
positiveterminal
If this switch is closed, the light will turn on if the switch in the base circuit is closed.
Gro
un
d
con
necti
on
Ground connection
Ground connection
Simple Switching Circuit Example
NPN-Transistor
Bipolar Junction TransistorBipolar Junction Transistor
This switch now controls the light. If it is closed, the light will go on.
n p n
Collector
Emitter
Base
negativeterminal
positiveterminal
electron flow
Gro
un
d
con
necti
on
Ground connection
Ground connection
Simple Switching Circuit Example
NPN-Transistor
Bipolar Junction TransistorBipolar Junction Transistor
Collector
Emitter
negativeterminal
positiveterminal Base
Ground connection
Ground connection
Gro
un
d
con
necti
on
NPN-Transistor
Another view of the npn transistor switch circuit
Collector
Emitternegativeterminal
positiveterminal Base
Ground connection
Ground connectionG
roun
d co
nnec
tion
This new cartoon is a little closer to reality since it includes a drawing of a real npn transistor with its correct pin locations.
This new cartoon is a little closer to reality since it includes a drawing of a real npn transistor with its correct pin locations.
BaseEmitter
Gro
un
d
con
necti
on
Negative terminal positive
terminal
Ground connection
Collector
NPN-Transistor
NTE 198
Notice that the base connection is not in the middle of the device package even though inside the package the base is in the middle of the device.
Notice that the base connection is not in the middle of the device package even though inside the package the base is in the middle of the device.
NTE 198
BaseEmitter
Negative terminal
positiveterminal
Ground connection
Emitter
Base
Collector
NPN-Transistor
Negative terminal
positiveterminal
Ground connection
Emitter
Base
Collector
NPN-Transistor
Negative terminal
positiveterminal
Ground connection
Emitter
Base
Collector