BC857BW,135

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The bipolar junction transistor (BJT) is one of the most commonly used semiconductor devices to amplify small signals in electronic circuits. The BC857BW,135 is one type of bipolar junction transistor that is commonly used in smaller signal and power amplifier circuits. This section will take a look at what it is and how it works, and some of its typical applications.

Overview of BC857BW,135 Transistor

The BC857BW,135 is a general-purpose PNP bi-polar transistor manufactured by Vishay Semiconductors. It is a single-transistor, low-noise and low-power device, with a Vce breakdown voltage of 45V, a current gain of 100-300, and a maximum collector current of 500 mA. This makes it an ideal choice for many low-noise, small signal amplifier and switching applications. Furthermore, this transistor can be used for a wide variety of purposes due to its long-standing industrial acceptance.

BC857BW,135 Transistor Applications and Working Principle

The BC857BW,135 transistor is used in a wide range of applications, such as logic circuits, interfacing digital and analog signals, signal gain and mixing, motor control, etc. It can also be used as an audio amplifier, RF amplifier, and DC amplifier in medium power applications. When used in amplifier circuits, the most common configuration is the Common-Emitter configuration. Common-Emitter amplifiers are generally the best choice for audio amplifiers as they have a high voltage gain and a low output impedance. In the Common-Emitter configuration, the collector is connected to the ground while the emitter and base are connected to the power supply. The transistor is then connected to an externally applied input signal, and the output voltage is taken from the collector of the transistor.

The working of the BC857BW,135 can be further understood by analyzing the common-emitter configuration. The base is connected to the input voltage source, and acts as the control element of the circuit. When a small current is passed through it, the current applied to the base is amplified at the collector side, providing the required output current. As both these operands in the Common-Emitter configuration reinforce each other, the output current is amplified and the circuit acts as an amplifier. Furthermore, the Common-Emitter configuration has a wide range of frequency response, which makes it ideal for audio amplifiers.

The BC857BW,135 transistor also has an advantage over other types of transistors as it operates at very low power levels. This makes it ideal for applications which require both high gain and low power consumption. Furthermore, the device is also stable in both active and saturated regions, allowing it to be used in various applications.

Conclusion

The BC857BW,135 is a single-transistor device that is well-suited for many low-noise, small-signal amplifier and switching applications. It has a Vce breakdown voltage of 45V, a current gain of 100-300, a maximum collector current of 500 mA, and a wide frequency response. Furthermore, it is ideal for power-saving applications due to its low power consumption. It can be used in a variety of applications such as logic circuits, interfacing digital and analog signals, signal gain and mixing, motor control, audio amplifier, RF amplifier, and DC amplifier in medium power applications.

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