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Introduction

2N2907AUB is a silicon NPN planar transistor manufactured in a TO-18 metal case, several pins when connecting to the circuit. It is presented with distinctly marked long leads making them easier to be recognized and avoid incorrect insertion. It has many applications; it is mainly used as a general-purpose amplifier or driver.

2N2907AUB application field

This popular and versatile transistor is used anywhere that a general-purpose amplifier, a switch or a converter is needed. Its most common uses include:

• Use it in Astable multivibrator oscillator circuits that serve for functions such as radio frequency emitters, light detection and switching intermittent circuits.
• Use it as a direct amplifier, mainly in audio circuits and small transmission amplifiers.
• Used as a switch in reactive circuits such as fixing limits for proximity detectors and triggering for relay systems.
• Additionally, it can be used in a variety of circuits that require amplifier, switch and converter applications.

2N2907AUB working principle

The 2N2907AUB is a Silicon NPN transistor that uses two semiconductor N-type and P-type materials separated by a thin insulating layer of P-type material that creates a PN junction. The 2N2907AUB is in a BJT (Bipolar Junction Transistor) configuration. BJT’s use two PN junctions called the base-emitter junction and the base-collector junction. The transistor has three pins. The left is collector, the middle is base and the right is emitter.

In the On state, the current flowing between the collector and the emitter generates an electromagnetic field, which attracts current from the base, allowing current to flow through collector and emitter. Therefore, this transistor works as an amplifier with almost two cascaded transistors. The base current controls the collector current, in other words, the value of base current determines the value of collector current. The input signal is applied to the base of the transistor while the collector is the output.

Conclusion

In summary, 2N2907AUB is a PNP Silicon planar transistor with a TO-18 metal case. It is a three-pin semiconductor device commonly used as a general-purpose amplifier and/or switch. This device has a very wide range of applications and is used to do many things such as act as an oscillator, limit proximity detector, amplifier and a switch in relay systems.

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