The 2N is a common NPN bipolar junction transistor used for general-purpose low-power amplifying or switching applications. This transistor is low-cost, widely available and sufficiently robust to be of use by experimenters and electronics hobbyists. The 2N is used very frequently in hobby electronics projects, including home-made ham radios , code-practice oscillators, analog amplification, and interfacing device for microcontrollers. The complementary PNP transistor is 2N
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Note: Complete Technical Details can be found at the 2N datasheet given at the end of this page. 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.
When a transistor is used as a switch it is operated in the Saturation and Cut-Off Region as explained above. As discussed a transistor will act as an Open switch during Forward Bias and as a closed switch during Reverse Bias, this biasing can be achieved by supplying the required amount of current to the base pin.
As mentioned the biasing current should maximum of 5mA. Anything more than 5mA will kill the Transistor; hence a resistor is always added in series with base pin. The value of this resistor RB can be calculated using below formulae. The value of IB should not exceed mA. A Transistors acts as an Amplifier when operating in Active Region. It can amplify power, voltage and current at different configurations. Of the above types common emitter type is the popular and mostly used configuration.
When uses as an Amplifier the DC current gain of the Transistor can be calculated by using the below formulae. Subscribe to stay updated with industry's latest Electronics components and news. Amplifier modules like Audio amplifiers, signal Amplifier etc Component Datasheet. Tags NPN Transistor. Get Our Weekly Newsletter!
2N3904 Datasheet, Equivalent, Cross Reference Search