2N3904 NPN Transistor

Transistors are common components that are used as switching components in circuits to switch different signals. One of the big advantages of transistors as switches are that you can use them to switch with analog signals and the output of the transistor will also change with respect to the input analog signal. These general purpose NPN transistors are ideal to be used on circuits that uses 6V logic and to do low side switching.

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Datasheet for 2N3904