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# How does a 2N3904 work?

## How does a 2N3904 work?

2N3904 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin. 2N3904 has a gain value of 300; this value determines the amplification capacity of the transistor.

How do you calculate gain in electronics?

Amplifier gain is simply the ratio of the output divided-by the input. Gain has no units as its a ratio, but in Electronics it is commonly given the symbol “A”, for Amplification. Then the gain of an amplifier is simply calculated as the “output signal divided by the input signal”.

### Is a 2N3904 a NPN transistor?

The 2N3904 is an extremely popular NPN transistor that is used as a simple electronic switch or amplifier that can handle 200 mA (absolute maximum) and frequencies as high as 100 MHz when used as an amplifier.

What does 2N3904 mean?

2N3904 is a silicon NPN Bipolar Junction Transistor (BJT), enclosed in TO-92 package and is normally used for switching & amplification purposes. 2N3904 Pinout consists of 3 Pins i.e. Base, Emitter & Collector.

#### What is the maximum collector current of a 2N3904 transistor?

The maximum collector current of the transistor is 200mA therefore user can drive loads under 200mA in their electronic applications, Moreover 2N3904 also work good as an amplifier, the total device dissipation is 625 milliwatt due to which it can also be used for audio and RF signal amplification purposes.

How does 2N3904 convert from reverse biased to forward biased?

When small voltage applies at its Base Terminal (normally 5V), 2N3904 converts its state from reverse to forward biased and conventional current starts flowing from Collector to Emitter.

## What happens when 5V is applied to 2N3904 at base terminal?

Now when we have applied 5V at Base Terminal (using LogicState in Proteus), 2N3904 gets forward biased and now LED is ON, as shown in below figure: