2N4403 PDF

The component is cheap and easy to work with so it is best suited when choosing a random switching device. How to use 2N Transistor 2N can be used in any general transistor application circuits but for understanding the working let us consider a simple 2N switching circuit as shown below. In the above circuit we are using 2N as a simple switching device and a small motor as the load. The small button here is for providing the trigger to the transistor and can be removed to leave simple contacts to touch. With the gain of the transistor a simple touch can trigger it.

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Brief Description on 2N Transistor 2N 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. The maximum amount of current that could flow through the Collector pin is mA, hence we cannot connect loads that consume more than mA using this transistor. To bias a transistor we have to supply current to base pin, this current IB should be limited to 5mA.

When this transistor is fully biased then it can allow a maximum of mA to flow across the collector and emitter. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around mV.

But there are two important features that differentiate the 2N and 2N How to use 2N Transistor This transistor like all can be used either as a switch or as an amplifier. The Base-Emitter voltage of this transistor is 6V so you just have to supply this voltage across the base and emitter of the transistor to induce a base current into the transistor. This transistor will make it forward biased and thus closes the connection between collector and emitter.

However one important thing to notice is the Base resistor a. As the name suggests this resistor will limit the current flowing through the transistor to prevent it from damaging. In actual circuit modifications might be required. I have used a base voltage of 5V and a value of 1K as current limiting resistor Note that the motor here draws about mA from the 12V power source, since the 2N has collector current rating upto mA this circuit is possible had it been a BC the transistor should have been burnt.

Can be used to switch high current upto mA loads It can also be used in the various switching applications. Component Datasheet.

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