2SC3979

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2SC3979 Application Field and Working Principle

The 2SC3979 is a type of transistor that falls into the category of transistors known as Bipolar (BJT) - Single. It is a NPN silicon epitaxial transistor and its main usage is in audio operation, switching application, and general circuit applications. This type of transistor is designed and manufactured taking into account several factors such as operating temperature range, application reliability, cost, power dissipation, and circuit design.

Design and Construction

The 2SC3979 is constructed using a planar process and a silicon epitaxial base. The transistor has three leads, a collector, a base, and an emitter. The collector lead is the longest and the emitter the shortest. A heat sink is attached at the collector lead to dissipate the heat generated during operation. The 2SC3979 package is a TO-220 plastic package with a height of 6.2mm, a width of 7.6 mm and a weight of 2.8g.

Working Principle

The 2SC3979 is an NPN type transistor meaning it has both a positive and a negative current flow. It operates in three states: cut-off, saturation and active. In cut-off mode, the collector current is zero and the base-emitter voltage may be negative or positive. In saturation mode, the collector-emitter voltage is almost zero, the collector current is at the rated maximum and the base current is almost zero. In active mode, the base-emitter voltage is between cut-off and saturation voltage and the collector current is equal to the base current.

The 2SC3979 is used mainly in audio amplifier and switching applications. In audio amplifiers, it is used to amplify the signal voltage or current. It is also used for switching applications such as for turning a lamp or a load on or off. It can be used for general circuit applications where circuit design and power dissipation are of prime consideration.

Characteristics

The 2SC3979 has a much higher collector-emitter breakdown voltage rating of +/- 820 V which is much higher than all other available transistors. It also has a much lower DC current gain (hfe) of 20-50 which means it is necessary to drive more current into the base in order to get the desired current out of the collector. The collector-emitter saturation voltage (Vce(sat)) is 0.2 V and the collector-emitter voltage rating is 500V.

Conclusion

The 2SC3979 is a NPN type transistor that is used in audio operation, switching application and general circuit applications. It is characterized by its high collector-emitter breakdown voltage rating and low DC current gain(hfe). Its application field and working principle can be used to design and construct a number of circuits in many applications.

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