BD679

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Transistors are common electronic components used to amplify and switch electrical signals. Among the most commonly used transistors are the bipolar junction transistors (BJT), and the most popular of these single BJTs is the BD679.

Application field

The BD679 is specifically designed and manufactured for video, audio and motor control applications. The transistor is highly valued in these application fields due to its ability to provide low noise and high power output when compared to other transistors. By combining high performance with cost-efficiency and high availability, the BD679 has become an essential component in many current audio, video and motor control devices.

Working principle

The BD679 transistor is a three-terminal (base, collector, and emitter) device used in amplifying and switching electrical signals. It has a maximum power dissipation rating of 500 mW (milliwatts) and maximum collector current rating of 1.2 A (amperes). It operates in the NPN transistor Configuration. The collector-base voltage rating is 50 V (volts) minimum, while the collector-emitter voltage rating is 40 V minimum. The emitter-base voltage rating is 7 V minimum. The base current rating is 40 mA maximum.

The BD679 transistor relies on the flow of electrons from the base terminal to the collector terminal in order to conduct current. To facilitate this flow, a voltage applied to the collector terminal greater than the base voltage creates a "forward bias" which is needed to increase the current flow. When the base voltage is greater than the collector voltage, the transistor is in "reverse bias" mode and cuts off the current flow, thus serving as a switch.

As a switch, the BD679 transistor is usually used to open or close a circuit for applications including small-signal amplifier circuits, small motor control circuits, audio amplifiers and video amplifiers. The BD679 is also used in Pulse Width Modulation (PWM) circuits and power supply circuits.

Conclusion

The BD679 is an extremely useful NPN transistor designed for video, audio and motor control applications. It is highly valued by device manufacturers for its excellent performance, quality and cost-efficiency. Due to its versatile nature, the BD679 transistor can also be used in amplifier and switch applications such as small-signal amplifiers, audio amplifiers, PWM circuits and power supply circuits. The BD679 is therefore a vital component in modern audio, video and motor control devices.

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