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Introduction to 2n6547
- 2n6547 is an NPN bipolar junction transistor that comes with high voltage and current capability and fast switching speed, mainly used in switched mode power supplies and flyback and forward single transistor low power converters.
- It comes in a TO-3 metal case and is an ideal choice for industrial and switching applications from single and three-phase mains.
- This NPN transistor is a bipolar junction transistor where conduction is carried out by the movement of both charge carriers, i.e electrons, and holes, however, main charge carriers are electrons.
- It mainly consists of three terminals called emitter, base, and collector.
- All three terminals are different in terms of size and doping concentration. An emitter is highly doped as compared to base and collector while a base is lightly doped.
- When a voltage is applied at the base terminals, it triggers the electron reaction which draws current.
- Small base current is used to control large current at the emitter and collector side.
- Electrons play an important role in maintaining the bridge between emitter and collector of this transistor.
Following figure shows the pinout of 2n6547
- This transistor is basically a current operated device where small current at the base side is used to control the large current at the emitter and collector side.
- The ability of base current to control large currents is used for amplification purpose.
- This transistor is a bipolar current controlled device which is different than JFET that is a unipolar voltage controlled device.
Circuit Symbol of 2n6547
Following figure shows the circuit symbol of 2n6547.
- The base of the transistor is more positive than the emitter while the voltage at the collector side is more than base voltage.
- Current at the emitter side is equal to the sum of current at the base and collector side.
- As it is an NPN transistor, it sources the base current to the transistor.
- The measure of a number of electrons that pass from base to collector is called transistor efficiency.
- The base is lightly doped and the emitter is heavily doped that will allow the electron to move from the emitter to base more than it will allow the holes from base to emitter.
- Transistors always operate in forward biased mode. If we interchange emitter and collector and makes it reverse biased, then the value of alpha and beta will be much lesser than they will be in forward biased mode.
- Forward current gain is represented by beta β, which is an important factor for amplification purpose. It is a ratio between collector current and base current and its value ranges between 20 to 1000, however, its standard value is 200.
- Current gain is another important factor which is a ratio between collector current to the emitter current and it is denoted by alpha α. Value of alpha ranges between 0.95 to 0.99, however, most of the times alpha value is considered as a unity.
Absolute Maximum Ratings of 2n6547
Following figure shows the absolute maximum ratings of 2n6547.
- It is important to note that these are the stress ratings. If these stress ratings are exceeded above absolute maximum ratings, they can damage the device at large and affect the quality of the component.
- If these stresses are applied for a maximum period of time, they can affect the reliability of the component.
- Take strict measures and follow international protocols while dealing with this components, otherwise, they can affect the project you are picking this component for.
- It is mainly used in switched mode power supplies.
- Flyback and forward single transistor low power converters make use of this device as it exhibits high voltage and current capability.
- This transistor is an ideal choice for switch mode applications ranges between 115 to 220 V.
- Inductive circuits where fall time plays an important role, are equipped with this transistor.
- For industrial purpose, it is used for motor drive control.
That’s all for today. This transistor comes with electrons as majority carriers, different than PNP transistor that comes with holes as majority carriers.
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