Introduction to 2sa1015
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Introduction to 2sa1015. It is a low frequency PNP (positive-negative-positive) bipolar junction transistor which is mainly used for general purpose amplification. It mainly consists of N doped semiconductor which exists between the two layers of P doped material. I'll try to cover every aspect of this transistor so you don't have to go anywhere else for finding the information regarding this transistor. Let's hop on the board and explore the details on this PNP transistor.
Introduction to 2sa1015
- 2sa1015 is a PNP low frequency transistor which is mainly used for general purpose amplification.
- It mainly consists of three terminals called emitter, base and collector.
- N layer of this transistor represents the base side while other two P layers represent emitter and collector receptively.
- Base is always negative with respect to emitter.
- As it is bipolar junction transistor so conduction is carried out by both charge carriers i.e. electrons and holes, but majority charge carriers will be holes.
- When negative voltage is applied at the base side it gets biased and current starts to flow from emitter to collector.
- It is referred as a current control device because small current at the base side is used to control the large current at the emitter and collector side.
- In this PNP transistors P layer shows the polarity applied at the emitter side which is positive while N side shows the polarity at the base side which is negative.
- Current will only flow when base is negative with respect to emitter.
2sa1015 Pinout
This PNP transistor mainly consists of three terminals.
1: Emitter
2: Base
3: Collector
- Base side is lightly doped while emitter side is heavily doped.
- Difference between emitter and collector is their size and doping concentration. Emitter is heavily doped while collector is lightly doped.
Circuit Diagram of 2sa1015
Following figure shows the circuit diagram of 2sa1015 PNP transistor.
- Current at the emitter side is the sum of current at base and collector side.
- Current will flow from collector to emitter and majority charge carriers will be holes.
- This transistor is referred as a current controlled device where small current at the base side is used to control large current at the emitter and collector side.
Absolute Maximum Ratings of 2sa1015
Following figure shows the absolute maximum ratings of 2sa1015.
- Collector-Base and Collector-Emitter voltage is -50.
- And maximum collector power dissipation is 400 mW.
- These are the stress rating above which device can damage.
- If stresses are applied for extended period of time, they can effect the device reliability.
Difference between PNP and NPN Transistors
- Both NPN and PNP works in a similar way with some exceptions. Voltage polarity and current directions will be reversed in case of PNP transistors as compared to NPN transistors.
- In case of PNP transistor, current will sink to its base side while in case of NPN transistor, base sources current to the transistor.
- Most of the professionals prefer NPN transistor over PNP transistors because they consider conduction through mobility of electrons is better than conduction through mobility of holes.
Transistors as a Matched Switch
- Both NPN and PNP transistors behave like a switching devices.
- You might come across an idea what is the purpose of using PNP transistors while there are already tons of NPN transistors out there which can be used for amplification. However, when PNP transistors are used in combination with NPN transistors, they help in designing the perfect power amplifier circuit.
- Class B amplifiers widely use combination of both NPN and PNP transistors where both transistors are used to control the current flowing in both directions at any time.
- Transistors are called complementary transistors which use both NPN and PNP transistors of same characteristics.
- In Class B-amplifiers, both NPN and PNP transistors work in a same fashion i.e. NPN transistors conducts for the positive half cycle and PNP transistor conducts for the negative half cycle of the transistor. This results in flowing the power at the load output in both directions.
Applications
- These transistors are widely used for voltage and power amplification.
- When these transistors are incorporated with NPN transistors, they construct a perfect bond and current starts to flow from both sides of NPN and PNP transistors.
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Introduction to 1n914
Hello Everyone! I always love to keep your stomach filled with useful information so you can excel and grow in your relevant field. Today, I am going to reveal the details on the
Introduction to 1n914. It is a small signal diode that allows the current to flow in one direction and blocks the current in other direction. It features operating junction temperature of 175 ºC and forward surge current of 4A. It is widely used for industrial and power management applications. I'll give you a brief details about this diode, so you don't have to go anywhere else for finding the information regarding this small signal diode. Let's get started.
Introduction to 1n914
- 1n914 is a small signal diode that is widely used in portable devices.
- It exhibits zero resistance in one direction and maximum resistance on the other direction, so current will flow in one direction only.
- This unidirectional behavior is sometimes referred as a rectification which is an ability to convert AC current to DC current.
- This diode is also termed as a electronic version of check valve.
- It is basically a polarized components which consists of two terminals called anode and cathode.
- Normally silver mark shows the cathode side of the diode.
- It will only conduct when there is some form of threshold voltage present in its forward biased mode.
- It will seize the current to flow in reverse biased mode.
- Normally diode exhibit non linear current-voltage characteristics, however these non-linear characteristics can be customized by using a specific semiconductor and doping impurities that are diffused in the diode material during the manufacturing process of diode.
- These diodes are widely used for power conversion. Rectifiers are made from diodes which convert AC current to DC current and provide better performance.
- Diodes are used to protect highly sensitive electronic devices from voltage surge. In normal conditions, these diodes are reverse biased and don't conduct. When there is any surge of high voltage occurs, current starts to flowing and they get forward biased.
- Many integrated circuits are incorporated with these diodes which block the high voltage surge and save the sensitive transistors from damaging.
Properties
- This diode features forward surge current of 4A at pulse width 1µs.
- It shows 1A surge current at pulse width of 1s.
- Operating junction temperature of 175 C.
- Maximum repetitive reverse voltage of 100V.
- Maximum power it can dissipate is 500mW.
- Forward voltage of 1V at 10mA.
- Reverse recovery time of 4ns.
Features
- It shows high conductance in one direction only. It blocks the current in other direction.
- This signal diode is highly reliable and come with low cost.
- Fast switching speed makes the function of this diode incredibly simple.
- Used for general purpose switching applications.
- It is AEC-Q101 qualified and highly durable.
Absolute Maximum Ratings
Following figure shows the absolute maximum rating of 1n914 small signal diode.
- It is important to note that if stresses are exceeded above absolute maximum ratings, they can damage the device.
- Similarly if stresses are applied for extended period of time, they can effect the device reliability.
- These absolute maximum ratings are the limiting values above which the diode serviceability may be affected.
Applications
- It is widely used in industrial applications.
- Power management and portable devices use this type of diode.
- It is useful for the demodulation of AM (amplitude modulated) radio signal. Actually AM signal mainly contains alternately positive and negative peaks of the carrier wave. The amplitude of these signal is directly proportional to original audio signal. Function of diode is to rectify the AM signal which ultimately leaves behind the original positive cycles of the carrier waves. Filter is used to extract the audio signal from this rectified carrier wave and then fed into the amplifier that produces sound waves.
- Diodes are incorporated with other components to make AND and OR logic gates.
- These diodes are widely used as a temperature sensing device because forward voltage drop is highly dependent on temperature.
That's all for today. I hope you have enjoyed the article. For your convenience, I always try to give information in sorted form so you can digest the information without much effort. However, if still you feel skeptical or have any question about understanding the concept of this diode, I'd love to help you in this regard according to best of my expertise. Your suggestions and feedback will be highly appreciated. Stay Tuned!