2N2907A W/GOLD

Series:	*
Part Status:	Obsolete

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Introduction

2N2907A W/GOLD is a type of bipolar junction transistor (BJT). As a BJT, it has three terminals — the emitter, base, and collector. It works in three different modes: active, saturation, and cut-off. In fact, it is one of the most versatile semiconductor devices available today. 2N2907A W/GOLD is usually used in switching applications, amplifier circuits, and voltage regulators.

Application Field

2N2907A W/GOLD is widely used in many types of electronic products. It can be used as switches and sensors in many industrial and consumer products such as washing machines, refrigerators, air conditioners, and microwave ovens. It is also used in amplifiers, voltage regulators, and oscillators. Due to its excellent characteristics, 2N2907A W/GOLD is extensively used in radio frequency (RF) circuits. It can be used in both high and low frequency applications. In low frequency applications, it is often used in oscillators and amplifiers to provide gain and stabilize the signal. In high frequency applications, it is widely used in wireless communication systems like Wi-Fi, Bluetooth, and GPS.

Working Principle

When electricity is applied across the emitter and base terminals of a 2N2907A W/GOLD, the electrons in the n-doped semiconductor are attracted to the positively charged base terminal, leaving positively charged "holes" in the semiconductor. This causes a sudden increase in the current flowing from the base to the emitter terminal. The collector terminal is connected to a high positive voltage, which causes the current to flow from the base to the collector rather than to the emitter. This process is called current amplification because the collector current is amplified by multiplication due to the voltage applied at the collector. This voltage applied across the collector and emitter terminals is referred to as the "base-emitter voltage", or B-E voltage. When the voltage cross the base-emitter junction exceeds the certain level, the current that flows through the junction can be amplified. This property is known as gain. The gain of a 2N2907A W/GOLD can range from 100 to 500, depending on the B-E voltage. It is also possible to adjust the gain of a 2N2907A W/GOLD by varying the collector-emitter voltage (Vce). The gain will increase as Vce increases, until it reaches its maximum value. Once the maximum value is reached, further increases in Vce will result in a decrease in the gain.

Conclusion

As one of the most versatile semiconductor devices available today, 2N2907A W/GOLD has found applications in a wide range of electronic products. It can be used as switches and sensors in many consumer and industrial products as well as amplifiers, voltage regulators, and oscillators. Furthermore, its gain can also be adjusted by varying the collector-emitter voltage.

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