FJZ945OTF

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Bipolar junction transistors (BJTs) are semiconductor devices with three terminals, the emitter, base and collector, designed to amplify and switch small electrical signals. FJZ945OTF transistors belong to the category of discrete single BJT and they often go in low-end logic level applications. This article will explain their application fields and working principles.

Application Fields

The FJZ945OTF transistors are often used as components in electronic devices, taking advantage of their small size and high switching speed. Usual applications where this type of transistors may be implemented include intercoms, burglar alarms, television sets, computer peripherals, industrial automation equipment and medical devices. One other important application is the automotive field, where FJZ945OTF transistors are often used in applications like fuel injection systems, air bags, speed control and stability control, automotive lighting and sound systems.

Working Principle

FJZ945OTF transistors are ideal for low-end logic level applications because of their low threshold voltage and low collector-emitter saturation voltage. As a result, they have a wide range of functioning voltages and currents, starting from a few volts up to several hundred volts. They also have a very low input capacitance so they can switch on and off quickly.

The FJZ945OTF transistors are built with an emitter, base and collector coupled together by semiconductor materials. The operation of these components is based on the principle of quantum tunneling. Basically, the electrons can ‘leak’ through the small gap between the emitter and the collector and the collector current increases exponentially with the base current. The higher the base current, the higher the collector current, thereby amplifying the electrical signals.

By controlling the amount of base current, the switching action of the transistors is made possible. When the base current exceeds a certain value, the collector current starts to flow, consequently turning the transistor ‘on’. When the base current drops below a certain value, the transistor is ‘off’. This way, the transistor can be used as an effective switching component.

Conclusion

The FJZ945OTF transistors are mainly used in low-end logic level applications. They are discrete single BJT transistors with low saturation voltages and have wide ranges of functional voltages and currents. The transistor’s switching action is based on the principle of quantum tunneling and it is mainly controlled by the base current. As a result, these transistors are very useful components in many electronic applications.

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