2N2904A

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The 2N2904A is an NPN transistor device that belongs to the single bipolar junction transistor (BJT) family. It is a general-purpose device and can be used in a variety of applications in the electronics circuit design. This article will provide an overview of the typical applications of 2N2904A and its working principle.

Overview of 2N2904A Transistor

The 2N2904A is an NPN transistor device manufactured by Central Semiconductor. It has a gain or hFE of 40 to 300, an emitter current of 0.06mA, and a collector current of 1.2A. The leakage current for the 2N2904A is about 100mA, and its power dissipation is 625mW. This device is available in a TO-92 packaging and has a wide range of environmental and operational characteristics that make it suitable for a variety of applications.

Applications of 2N2904A

The 2N2904A is a general-purpose device and can be used in a wide range of applications, including:

• Amplifier Stage: The 2N2904A can be used as an amplifier stage for small-signal audio amplifiers, as well as for video applications.
• Switch: The 2N2904A can be used as a switch, as it can be used to control a larger current or voltage with a small control signal.
• Logic Gates: The 2N2904A can be used to create various logic gates, such as NAND and NOR gates.
• Timer Circuits: The 2N2904A can be used in timer circuits, which can be used to control the timing of various processes.
• Relay Drivers: The 2N2904A can be used to drive relays, which can be used to control electrical devices.

Working Principle of 2N2904A

The 2N2904A is an NPN transistor device and its working principle is based on the e-b-c configuration of the three terminals: emitter, base, and collector. When a small-signal is applied to the base terminal, the current will flow from the emitter to the collector terminals and the collector current will be amplified. This is the process of current amplification. The gain of the device is determined by the ratio of the collector current to the base current. The 2N2904A transistor can provide amplification in both AC and DC signals.

Conclusion

The 2N2904A is an NPN transistor device that belongs to the single bipolar junction transistor (BJT) family. It is a general-purpose device and is suitable for a wide range of applications, including audio, video, switching, logic gates and timer circuits. The working principle of the 2N2904A is based on the e-b-c configuration and the device can provide amplification of AC and DC signals. In conclusion, the 2N2904A is a versatile device and can be used in a variety of applications in the electronics circuit design.

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