![]() Collector Emitter negative terminal positive Base Ground connection Base Emitter Ground connection Negative terminal positive terminal Collector 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. It has various applications and is used mostly for amplification and switching. It is the most useful of the two bipolar junction devices. Ground connection Another view of the npn transistor switch circuit positive terminal Base Collector Emitter negative terminal Ground connection Ground connectionĨ NPN-Transistor This new cartoon is a little closer to reality since it includes a drawing of a real npn transistor with its correct pin locations. NPN transistor is a three-terminal device having a p-type semiconductor sandwiched between the two n-type semiconductors. ![]() Simple Switching Circuit Example Ground connection Collector electron flow Emitter negative terminal positive terminal Ground connection Base Ground connectionħ Another view of the npn transistor switch circuit Emitter n p n negative terminal Ground connection positive terminal Base Ground connectionĦ NPN-Transistor Bipolar Junction Transistor ![]() Bipolar Junction Transistor Simple Switching Circuit Example Ground connection Collector If this switch is closed, the light will turn on if the switch in the base circuit is closed. The “Tin Can” it isn’t tin and it isn’t a can! Base OR Gate Emitter OR Source Collector OR DrainĤ NPN-Transistor Bipolar Junction Transistor Silicon structure with a shortage of electrons in its structure p-type material Base Silicon structure with extra electrons in its structure Collector n p n Silicon structure with extra electrons in its structure Emitter n-type materialĥ NPN-Transistor n p n Simple Switching Circuit Example The 1960’s transistor However, ultimately the operational principles for the pins with similar names is not the same for different types of transistors. ![]() As a first pass at this technology, it will not hurt to associate the names in pairs. Transistors are constructed differently and this fact is reflected in the names that are given to the pins. 1 The NPN transistor as a circuit elementĢ “Tin Can” NPN-Transistor Transistors Replace Mechanical Switchesģ NPN-Transistor The 1960’s transistor The “Tin Can”
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