2N4905

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2N4905 Application Field And Working Principle

The 2N4905 is a medium-power bipolar junction transistor (BJT) from the 2N4900 series from Motorola. It is a "small signal" transistor, meaning those intended for use in switching, audio and general amplification applications. It is widely used for general purpose amplifier applications such as low-noise current gain amplifiers and actively-controlled voltage amplification.

Overview

The 2N4905 is a bipolar transistors which is particularly important in electronics because it uses the physical properties of electrons flow. Bipolar transistors are relatively easy to design with and are versatile when it comes to switching applications. This transistor is a basic NPN type silicon transistor very common in electronic equipment of all kinds.

Package

It is available in a TO-220 package and known as a 2N4905, however, the 2N4905 is also available with a TO-92 casing and known as a 2N4401. The 2N4401 is equivalent to the 2N4905 with very slight differences in the characteristics. The 2N4905 is also available with a metal case, as a 2N4907.

Characteristic

The 2N4905 is a medium power NPN silicon transistor and has a wide range of applications such as in circuits using dc powered components such as relays, small timers, buzzers and any other dc powered circuit. It is rated at up to 600 volts and up to 800 milliamps of current. It has a bandwidth of 0.5 MHZ in maximum and a switching time of 10 microseconds. It is also very efficient and economical, making it very popular in modern electronic applications.

Working Principle

The 2N4905 is a three-layer construction transistor that operates on forward-biased junction conduction. The NPN version, which is made up of a base, collector and emitter, is the most common type. The transistor works by using a small current applied at the base to control a larger current between the collector and emitter. When the base current is increased, the collector current increases and vice versa. This change in current is known as current gain.

The collector current is proportional to the supply voltage, and the total power is proportional to the current and voltage, so the switching power is proportional to the square of the supply voltage. This transistor is easy to use and can handle high power levels, making it ideal for a variety of applications. It is also reliable, low cost and simple to use, making it a versatile choice.

Applications

The 2N4905 is commonly used in electronic switches, inverters, amplifiers, signal generators and other related circuits. It is also used in amplifier circuits such as audio, RF, and microwave amplifiers. It can be used as an oscillator in oscillator and driver circuits. This transistor is also useful as a low-noise amplifier and low-frequency oscillator. Moreover, It is suitable for applications that require high-speed response such as switching circuits.

In conclusion

The 2N4905 is a medium-power bipolar junction transistor (BJT) from the 2N4900 series from Motorola that is commonly used for applications such as low-noise current-gain amplifiers and actively-controlled voltage amplification. It is available in TO-220 and TO-92 packages and has a bandwidth of 0.5 MHz and a switching time of 10 µs. It is very efficient, reliable and easy to use, making it an ideal choice for switching and amplifier applications in a variety of electronic projects.

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