2N2642

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2N2642 Application Field and Working Principle

Introduced in 1971, the 2N2642 is a high-power medium frequency transistor. It has a Darlington configuration with two NPN transistors in series and offers typically 50 watts of power output. The product has been designed to allow it to function well within a wide range of environments and offers short-protection circuits.

The 2N2642 is mainly used as audio amplifiers, linear amplifiers, high frequency communicators, modulators, and switching devices. It is applicable in fields such as: industrial automation, communications, military, robotics, medical equipment, etc.

Working Principle

The 2N2642 is a high-power transistor, in which two NPN transistors are connected in series to form a Darlington configuration. Because of the high gain of the configuration, the transistor is able to provide a high power output. In addition, the Darlington configuration with two NPN transistors offers an increased immunity from voltage instabilities, noise, temperature and distortion.

The two transistors are connected in two ways: the collector of the first transistor is connected to the base of the second transistor; and the collector of the second transistor is connected to the base of the first transistor. The two transistors act together to control the current flow. When the control voltage is applied to the base of the first transistor, it turns on and allows current to flow from the collector to the emitter. This in turn will turn on the second transistor, which allows current to flow from the collector to the emitter as well. By controlling the base voltages of the two transistors, the current can be accurately controlled.

Advantages

The 2N2642 offers several advantages which make it suitable for a variety of applications. It is able to provide a high power output, allowing it to be used in higher-power applications than standard transistors. In addition, the Darlington configuration allows it to be more resistant to voltage instabilities, noise, temperature and distortion compared to other transistors. Finally, the 2N2642 is able to offer short-protection circuits, adding an extra level of safety in applications where safety critical.

Disadvantages

The 2N2642 also has certain disadvantages. It is a complex device and can be difficult to use and test. In addition, it is somewhat limited in its range of applications, and is not suitable for some applications such as high frequency switching. Finally, it can be relatively expensive compared to other transistors.

Conclusion

The 2N2642 is a high power transistor with various advantages over standard transistors. It is mainly used in audio amplifiers, linear amplifiers, high frequency communicators, modulators and switching devices. Its high power output, coupled with its immunity to temperature, noise and distortion make it suitable for a wide range of applications. However, it is also relatively expensive compared to other transistors, and can be difficult to use and test.

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