BC640,126

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BC640 and BC126 are two commonly used bipolar junction transistors (BJTs) from the family of single BJTs. These transistors are widely used by hobbyists, especially in applications where low power consumption and high voltage gain are desired. It is important for any designer to understand the working principles of these transistors so that they can utilize them to best effect.

BC640 and BC126 are both NPN type transistors and feature a number of similarities in their performance characteristics. They both have a common collector as the main terminal and have a power dissipation capability of 400 mW and 150 mW respectively. They both have a maximum DC current gain of 800 and 100 respectively and feature an on-state voltage drop of VBE=0.7V. They also both have a maximum Collector-Emitter Voltage Value of 30V and hence are designed for applications which require a low voltage rating.

The BC640 has an advanced control ability than BC126 due to its larger current gain and allows for greater customization for low power or high current applications. It excels in applications such as low power switching, amplifiers and digital circuits. It is most suitable for operations at low input currents, since it begins to saturate faster than the BC126. It typically operates with a higher collector to emitter voltage, hence making it well suited for high voltage applications.

The BC126, on the other hand, is designed primarily for applications requiring an efficient gain in a stable current. It is well suited for circuit designs that require a higher value of input current, such as those found in low frequency amplifiers. It is designed to allow for greater current at the output stage, making it favourable for applications such as audio amplifiers, automotive radios and control circuitry.

Both BC640 and BC126 transistors share a common feature in that they require a low bias voltage of typically 5 volts to function in a current-amplifying mode. The use of low bias allows for a more uniform operation of the transistors and increases the reliability of the overall circuit design. The transistor can be used as an amplifier or a switch in various applications, depending on its input and output signals.

In order to understand how these transistors are used, we must first look at the working principle of bipolar transistors. In general, these transistors are used for switching and amplifying purposes. An input signal is applied to the base of the transistor, which in turn causes a variation in the collector voltage. This voltage variation can then be increased or decreased, depending on the bias voltage supplied to the base. In addition, the collector current can be regulated by changing the collector-base voltage, allowing the transistor to act as an amplifier or a switch.

The BC640 and BC126 transistors are highly versatile and can be used in a variety of applications. These two transistors can be used to control the speed of a motor, as a switch in power supply design and can also be used as an amplifier. These transistors are also suitable for use in low noise circuits, as the low collector-emitter voltage ensures that the transistors remain in their active region at all times, resulting in a lower noise level.

In conclusion, the BC640 and BC126 are versatile and reliable transistors that are suitable for a wide range of applications. Understanding their working principles and characteristics will ensure that their optimum performance is realized in any circuit design.

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