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2N4921 Transistor
Product Overview
Category
The 2N4921 is a bipolar junction NPN transistor.
Use
It is commonly used for amplification and switching of electronic signals in various applications.
Characteristics
- Low power, high voltage capability
- Fast switching speed
- Small package size
Package
The 2N4921 is typically available in a TO-92 package.
Packaging/Quantity
It is usually sold in reels or tubes containing multiple units.
Specifications
- Maximum Collector-Base Voltage: 80V
- Maximum Collector-Emitter Voltage: 40V
- Maximum Emitter-Base Voltage: 6V
- Collector Current: 0.5A
- Power Dissipation: 625mW
- Transition Frequency: 100MHz
Detailed Pin Configuration
The 2N4921 transistor has three pins: 1. Collector (C) 2. Base (B) 3. Emitter (E)
Functional Features
- Amplification of weak electronic signals
- Switching of electronic circuits
- High voltage capability
Advantages
- Small package size
- Fast switching speed
- Suitable for low power applications
Disadvantages
- Limited maximum collector current
- Relatively low transition frequency
Working Principles
The 2N4921 operates based on the principles of bipolar junction transistors, where the flow of current between the collector and emitter is controlled by the base current.
Detailed Application Field Plans
The 2N4921 is commonly used in the following applications: - Audio amplifiers - Signal amplification circuits - Switching circuits
Detailed and Complete Alternative Models
Some alternative models to the 2N4921 include: - 2N2222 - BC547 - 2N3904
In conclusion, the 2N4921 transistor is a versatile component with applications in amplification and switching circuits. Its small package size and high voltage capability make it suitable for various electronic designs.
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Liệt kê 10 câu hỏi và câu trả lời thường gặp liên quan đến ứng dụng 2N4921 trong giải pháp kỹ thuật
What is the 2N4921 transistor used for?
- The 2N4921 is a general-purpose PNP bipolar junction transistor commonly used for amplification and switching applications.
What are the typical operating conditions for the 2N4921 transistor?
- The 2N4921 transistor typically operates at a maximum collector-emitter voltage of 40V and a maximum collector current of 0.5A.
Can the 2N4921 be used for audio amplification?
- Yes, the 2N4921 can be used in low-power audio amplifier circuits due to its moderate power handling capabilities.
Is the 2N4921 suitable for switching applications?
- Yes, the 2N4921 can be used for low-power switching applications due to its moderate current and voltage ratings.
What are the common circuit configurations for the 2N4921?
- The 2N4921 can be used in common emitter, common base, and common collector configurations depending on the specific application requirements.
What are the typical gain characteristics of the 2N4921?
- The 2N4921 has a moderate current gain (hFE) ranging from 60 to 300, making it suitable for various amplification tasks.
Are there any notable limitations of the 2N4921 transistor?
- One limitation of the 2N4921 is its relatively low power dissipation rating, which restricts its use in high-power applications.
Can the 2N4921 be used in temperature-sensitive environments?
- The 2N4921 has a moderate temperature range and can be used in many common electronic applications within standard operating temperatures.
What are some alternative transistors to consider if the 2N4921 is not available?
- Alternatives to the 2N4921 include the 2N4403, BC557, and BC558 transistors, which offer similar characteristics and can be used as substitutes in many applications.
Where can I find detailed specifications and application notes for the 2N4921?
- Detailed specifications and application notes for the 2N4921 can be found in the manufacturer's datasheet and technical documentation, which provide comprehensive information on its electrical characteristics and recommended usage guidelines.