BD677A

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Transistors - Bipolar (BJT) - Single

The BD677A is an NPN small signal silicon transistor intended for use in high-quality Linear Audio amplifiers and other general purpose applications. It is a preferred choice among many OEMs and retailers due to its cost effective production, electrical performance and wide range of availability.

Application Fields

The BD677A can be used in a variety of applications from high power linear audio amplifiers to low power general purpose logic circuits. It is suitable for high noise immunity, low distortion and audio signal stages such as VCA and line amplifier stages, as well as for the amplification of signals for radio frequency (RF) and industrial control systems. It can also be used as bias circuits for various applications, such as wideband amplifiers, audio amplifiers, power amplifiers and power drivers.

Working Principle

The BD677A works on the principle of bipolar junction transistor (BJT). In BJT-based transistors, the current conduction between the emitter and collector terminals is controlled by the base current. The base terminal is placed between the emitter and collector, and works as the controlling element. When a voltage is applied at the base terminal, the emitter-collector current increases due to the width of the base region, thereby creating a conducting path between the emitter and collector. The width of the base region can be varied by varying the voltage applied to the base terminal.

The BD677A has a typical collector-emitter saturation voltage of 0.2V and can be operated with a maximum collector current of 0.2A. The collector-emitter breakdown voltage is 25V. It is a fast transistor, with a typical turn-off time of 100ns and a typical transition time (from off to on) of 200ns.

Advantages

The BD677A has several advantages over other transistors, such as its low cost, high speed, small size and its wide range of availability. It is also a great choice for both high power linear audio amplifiers and low power general purpose applications. Furthermore, it is ideal for use in high noise immunity and low distortion audio signal stages.

The BD677A transistor can be used in a variety of applications, including audio amplifiers, mechanical relay control, power drivers, power amplifiers, and wideband amplifiers. In addition, it can be used as a switching element in applications that require fast response times such as industrial control systems. Finally, its cost effectiveness makes it an ideal choice for high volume applications.

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