Introduction to 2n5884

Introduction to 2n5884

• The 2n5884 is a power PNP bipolar transistor mainly used for general purpose amplification and switching purpose.
• It is a silicon semiconductor device that comes with three terminals called emitter, base, and collector.
• It comes with three layers where one N-doped layer is housed between two P-doped layers. The N layer represents the base of the transistor, while other two layers represent emitter and collector respectively.
• This component is also known as a current controlled device where a voltage applied at the base terminal is used to control large current at the emitter and collector terminals.
• This PNP component is a little bit different than its counterpart NPN transistor, however, both are bipolar components where current is carried out by the movement of both charge carriers i.e. electrons and holes. Electrons are major charge carriers in NPN transistor and holes are major charge carriers in PNP transistor.

• When a voltage is applied at the base terminal, it gets biased and draws current which is then used to control large current at the emitter and collector terminals.
• All these three terminals are different in terms of their size and doping concentration. An emitter is highly doped and carries more current as compared to base and collector. The base is lightly doped which is responsible to trigger electron reaction at the base terminal. The collector is moderately doped which accepts the holes in case of this PNP transistor.
• Output current obtained at the collector terminal is highly dependent on the voltage applied at the base terminal. This process is used for amplification purpose.
• You must have a look at the construction of diode which plays a vital role in the construction of this bipolar transistor.

Pinout of 2n5884

• Following figure shows the pinout of this PNP transistor which is composed of three terminals.

• Movement of holes plays an important role in the output current obtained at the output terminals.
• Unlike NPN transistor, a negative voltage is applied at the base terminal in this PNP transistor where the base is more negative as compared to emitter and collector.

Circuit Diagram of 2n5884

• An emitter is highly doped so current at the emitter side more than current at the collector and base side. Actually, emitter current is the sum of base and collector current.
• Unlike NPN transistor, holes are diffused through the base from the emitter in this PNP transistor, which are then collected by the collector.
• This PNP transistor is used for amplification purpose, however, most of the professionals don't recommend this transistor for amplification purpose and pick NPN transistor for amplification because conduction carried out by the movement of electrons is more effective and suitable than conduction carried out by the movement of holes.
• This transistor is different than JFET which is unipolar transistor i.e conduction is carried out by single charge carrier.

Absolute Maximum Ratings

• Following figure shows the absolute maximum ratings of this PNP transistor.

• It is important to note that, these are the suitable stress ratings recommended by the manufacturer, which if exceed from absolute maximum ratings, can damage the device severely.
• Similarly, if these ratings are applied for the maximum period of time above normal operating conditions, they can affect the overall reliability of the device.
• Take these ratings into consideration and make sure this component exhibits and follows same ratings defined by the manufacturer before you intend to place this component into your project.
• Proper measurements taken the early stages of your project can save your bunch of time and worry that can affect the nature and overall performance of the project.

Applications

• This component is used for amplification and switching purpose.

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• 2n5401 - PNP transistor