Introduction to 2n2905
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Introduction to 2n2905. It is a PNP (Positive-negative-Positive) bipolar junction transistor (BJT) which is mainly used for general purpose and switching applications. In this transistor, N doped semiconductor exists between the two layers of P doped material. I am going to give you brief details about this transistor. Let's get started.
Introduction to 2n2905
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- 2n2905 is a PNP bipolar junction transistor which is mainly designed for general purpose, small signal and switching applications.
- It comes in TO-39 casing and consists of three terminals called emitter, base and collector.
- N side represents the base of the transistors while other two P layers represent emitter and collector respectively.
- N represents the polarity at the base side which is negative and P represents the polarity at the emitter side which is positive.
- In order to flow current, base must be negative with respect to emitter.
- As it is a bipolar junction transistor so conduction is carried out by both charge carriers i.e. electrons and holes but majority charge carriers will be holes.
- Collectors-Base junction will always be reverse biased so opposite polarity must be required at the collector side.
- Base is negative with respect to emitter and collector will be more negative with respect to base.
- Small current at the base side is used to control large current at the emitter and collector side but majority charge carriers will be holes.
2n2905 Pinout
2n2905 is a PNP transistor which mainly consists of three terminals.
1: Base
2: Collector
3: Emitter
- This transistor is considered as a current controlled device where small current at the base side is used to control large current at the emitter and collector side.
- Emitter is highly doped while base will be lightly doped.
Circuit Diagram of 2n2905
Circuit diagram of this transistor is shown in the figure below.
- Current at the emitter side is equal to the sum of current at the base and collector side.
- Main difference between emitter and collector is their size and doping concentration. Emitter is highly doped while collector is lightly doped.
- Conduction is carried out by movement of both electrons and holes but majority charge carriers will be holes which will be collector by the collector.
Absolute Maximum Ratings of 2n2905
Absolute maximum rating of 2n2905 is shown in the figure below.
- Power dissipation is about 600mW.
- Collector-Base voltage and Collector-Emitter voltage is -60 and -40 respectively.
- These are the stress ratings. It is important to note that if stresses are exceeded above these absolute maximum ratings, they can damage the device at large.
- Also, if these stresses are applied for extended period of time, they can effect the device reliability.
Difference Between PNP and NPN Transistors
- Main difference between NPN and PNP transistors is the medium used for conduction. Electrons are majority charge carriers in case of NPN transistors while holes are majority charge carriers in case of NPN transistors.
- Most of the professional intend to prefer NPN over PNP transistors because they think that conduction carried out by mobility of electrons is better than conduction by the mobility of holes.
Combination of NPN and PNP Transistors
- Combination of NPN and PNP transistors can be used in most applications.
- If NPN are combined with PNP transistors, they can be used to design a power amplifier circuit with ideal output.
- Combination of these transistors can be used in Class B amplifiers where both transistors are used to control the current flowing in both directions at any instant of time.
- In Class B amplifiers both NPN and PNP transistors function in a similar fashion. PNP transistors conduct for the negative half cycle of the transistor while NPN conducts for the positive half cycle of the transistor.
- This helps in getting the power at output load in both directions.
- Transistors are termed as Complementary transistors which use the combination of both NPN and PNP transistors of identical characteristics.
Applications
- These transistors are used for high speed switching applications.
- Military and other high reliability driver applications involve these transistors.
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Introduction to 2n2907
Hey Guys! Hope you are doing great. I always try to fill your appetite with relevant information you can excel and grow in your field. Today, I am going to unlock the details on the
Introduction to 2n2907. It is basically a PNP bipolar junction transistor (BJT) which is mainly designed for switching and low power general purpose amplification applications. It has an ability to operate at very high speed and moderate temperature. I'll try to cover every aspect related to this transistor, so you don't have to go anywhere else for finding the information regarding this transistor. You can also check
Introduction to 2n2222 which is complementary NPN transistor of this PNP transistor. Let's hop on the board and explore what it does and what are its main applications. Let's get started.
Introduction to 2n2907
- 2n2907 is a PNP bipolar junction transistor which is mainly used for low power general purpose amplification and switching application.
- In this transistors, N layers is composed of semiconductor material which exists between the two layers of P type material.
- N side represent the base side and polarity will be negative at the base side.
- P side represents the emitter terminal and polarity at the emitter side will be positive.
- In order to conduct, base must be negative with respect to emitter.
- And collector-base junction will always be reverse biased so polarity must be reversed at the collector side. Collector is more negative with respect to base terminal.
- This transistor is a bipolar device, so conduction will be carried out by both charge carriers i.e. holes and electrons but majority charge carriers will be holes in this case.
- PNP and NPN transistors work in a similar fashion with some exceptions i.e. voltage polarities and current directions will be reserved in case of PNP transistors as compared to NPN transistors.
- Base is negative is PNP transistor while it is positive in case of NPN transistors.
- These transistors are termed as current controlled device because small current at the base side is used to control large current at the collector and emitter side.
- When we apply voltage at the base side it gets biased, and it allows the electrons to flow from emitter to collector.
- In case of PNP transistor, current will flow from emitter to collector but majority charge carriers will be holes which are then collected by the collector.
2n2907 Pinout
This transistors mainly contains three terminals
1: Emitter
2: Base
3: Collector
- The ability of base current to control large current at the emitter and collector side is used for amplification purpose.
- Emitter will be highly doped and base will be lightly doped.
- Collector and emitter are different to each other with respect to their size and doping concentration. Collector will also be lightly doped as compared to emitter.
Circuit Diagram of 2n2907
Following figure shows the circuit diagram of 2n2907.
- Current at the emitter side is the combination of base and emitter current.
- This transistor comes in TO-92 casing and can be manufactured with different pin configurations.
- In case of PNP transistor, holes are transferred internally which then allow the current to flow in the external circuit. In case of NPN transistors, electrons flow externally and conduction is carried out from emitter to collector.
- Both NPN and PNP transistor work in a same fashion but medium used for conduction is different. Most of the professionals prefer NPN transistors over PNP transistors because they consider, conduction through mobility of electrons is better than conduction through mobility of holes.
- However, both transistors come with a lot of advantage and can be used for similar applications.
Absolute Maximum Ratings of 2n2907
Following are the absolute maximum ratings of 2n2907
- These are the stress rating above which device can be completely damaged.
- Similarly, if stresses are applied for extended period of time, they can harm the device reliability. It is advised to keep the operating conduction within the range of absolute maximum ratings.
Combination of NPN and PNP Transistors
- Both NPN and PNP transistors are used in combination with each other.
- These transistors are incorporated perfectly to design a power amplifier output circuit which helps in generating the ideal output.
- Transistors that used combination of NPN and PNP transistos are called Complementary Transistors.
- Both NPN and PNP transistors are widely used in Class B amplifiers where both transistors help in controlling the current flowing in both directions at any time.
Applications
- This transistor is mainly used for switching and linear amplification.
- Analog amplification also involve this type of transistor.
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