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What is a Transistor?

What is a Transistor?
A transistor is a semiconductor containing a solid, non-moving part that passes a charge. A transistor can amplify and switch electronic signals and electrical power and is made of semiconductor material with at least three terminals that are used to connect to an external circuit. Transistors can amplify a signal because output power can be higher than input power. By applying a voltage or a current to one of the terminal pairs, there is a change in current through another pair of terminals.

Applications for Transistors:
There are many applications that use transistors including:
Logic gates
General switching
Amplification and sound reproduction
Signal processing
Radio transmission
Transistors in Topdiode

Transistors in Topdiode

Small Signal Transistors
P/N Package
PNP Silicon Transistors  
BC807-16/25/40 SOT-23
BC856A/B/C SOT-23
BC857A/B/C SOT-23
BC858A/B/C SOT-23
BC859A/B/C SOT-23
   
NPN Silicon Transistors  
BC817-16/25/40 SOT-23
BC846A/B/C SOT-23
BC847A/B/C SOT-23
BC848A/B/C SOT-23
BC849A/B/C SOT-23
BC850A/B/C SOT-23
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