BD708

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BD708 Application Field and Working Principle

The BD708 is a silicon PNP transistor that is classified as belonging to the family of single bipolar junction transistors (BJT). It was developed by STMicroelectronics and is generally used for power switching or amplification. This article will explore the working principle of the device as well as some of its applications.

Device Overview

The goal of the BD708 was to develop a PNP transistor that was capable of handling high power and temperature with minimum losses. To accomplish this, the design employed an advanced junction technology to provide high gain, low saturation voltage, and high current capability. The device offers various features such as an integrated diode for protection, integrated ESD protection, and increased current capability. The typical ratings for the device are 100mA, 50V, and 80W, although it is capable of handling higher power.

Working Principle

The basic principle behind the operation of the BD708 is quite simple. It is essentially a two-terminal device, with the base (B) being the controlling terminal and the emitter (E) and collector (C) being the output terminals. By applying a certain amount of current to the base terminal, the transistor conducts current between the collector and emitter terminals. The current gain of the device is determined by the relative values of the Collector-Emitter voltage and the Beta parameter.

Applications and Usages

The BD708 is widely used in a variety of industrial and automotive applications, including power switching and switching power supplies. The BD708 is also commonly used as a motor driver, which is a device that is used to control the speed and direction of a motor. Additionally, the BD708 is suitable for use in audio amplifiers and as a high-gain amplifier for small-signal applications. Other applications include power amplifiers, power supply regulators, and various other switching circuits.

Conclusion

The BD708 transistor is an efficient and reliable device that can be used in a variety of industrial and automotive applications. Its high power and temperature capabilities make it an ideal choice for a variety of circuits. The device can also be used as a motor driver or audio amplifier, and its high current ratings make it suitable for high-power switching applications. By understanding the device’s working principle, the various features and applications can be easier to grasp.

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