BD139 Transistor
Product Overview
Category
The BD139 transistor belongs to the category of NPN bipolar junction transistors (BJTs).
Use
It is commonly used for amplification and switching applications in electronic circuits.
Characteristics
- Low power, high voltage
- Medium current capability
- High DC current gain
Package
The BD139 transistor is typically available in a TO-126 package.
Essence
This transistor is essential for designing and building various electronic circuits due to its amplification and switching capabilities.
Packaging/Quantity
It is usually sold in reels or tubes containing multiple units, with quantities varying based on manufacturer and distributor specifications.
Specifications
- Collector-Base Voltage (VCBO): 80V
- Collector-Emitter Voltage (VCEO): 80V
- Emitter-Base Voltage (VEBO): 5V
- Collector Current (IC): 1.5A
- Power Dissipation (Ptot): 12.5W
- Transition Frequency (ft): 30MHz
- Operating Temperature Range: -65°C to 150°C
Detailed Pin Configuration
The BD139 transistor has three pins: 1. Collector (C) 2. Base (B) 3. Emitter (E)
Functional Features
- High current gain
- Low saturation voltage
- Fast switching speed
Advantages
- Suitable for low-power applications
- Reliable and widely available
- Cost-effective
Disadvantages
- Limited power dissipation capability
- Moderate frequency response
Working Principles
The BD139 operates as a current-controlled switch or amplifier. When a small current flows into the base, it controls a larger current flowing between the collector and emitter.
Detailed Application Field Plans
Amplification Circuits
The BD139 is commonly used in audio amplifiers, signal amplification, and other low-power amplification circuits.
Switching Circuits
It is utilized in various electronic switches, such as relay drivers and LED drivers, due to its fast switching characteristics.
Oscillator Circuits
In oscillator circuits, the BD139 can be employed for generating and maintaining oscillations at moderate frequencies.
Detailed and Complete Alternative Models
- BD135
- BD137
- BD140
- 2N3904
- 2N2222
In conclusion, the BD139 transistor is a versatile component that finds widespread use in amplification and switching applications within electronic circuits. Its combination of low power, high voltage, and medium current capability makes it suitable for a range of applications, despite its limitations in power dissipation and frequency response.
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Lista 10 Vanliga frågor och svar relaterade till tillämpningen av BD139 i tekniska lösningar
What is the maximum collector current of BD139?
- The maximum collector current of BD139 is 1.5A.
What is the typical hFE (DC current gain) of BD139?
- The typical hFE of BD139 is 40-160.
What is the maximum collector-emitter voltage of BD139?
- The maximum collector-emitter voltage of BD139 is 80V.
Can BD139 be used as a switch in electronic circuits?
- Yes, BD139 can be used as a switch in low-power electronic circuits.
What are the typical applications of BD139?
- BD139 is commonly used in audio amplifiers, voltage regulators, and general purpose switching applications.
Is BD139 suitable for use in high-frequency applications?
- No, BD139 is not suitable for high-frequency applications due to its limited frequency response.
What is the power dissipation of BD139?
- The power dissipation of BD139 is 12.5W.
Can BD139 be used in linear amplifier circuits?
- Yes, BD139 can be used in linear amplifier circuits, especially in audio amplifier designs.
What are the typical operating temperature ranges for BD139?
- The typical operating temperature range for BD139 is -65°C to 150°C.
Is BD139 suitable for use in high-voltage applications?
- No, BD139 is not suitable for high-voltage applications due to its limited collector-emitter voltage rating.