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1N4747A - Zener Diode
Product Overview
Category
The 1N4747A is a silicon planar power Zener diode.
Use
It is commonly used for voltage regulation and voltage reference applications.
Characteristics
- Forward Voltage: 1.2V
- Power Dissipation: 1.0W
- Zener Voltage: 20V
- Operating Temperature Range: -65°C to +200°C
Package
The 1N4747A is available in a DO-41 axial leaded package.
Packaging/Quantity
It is typically available in reels or bulk packaging with varying quantities.
Specifications
- Zener Voltage: 20V
- Tolerance: ±5%
- Maximum Reverse Leakage Current: 5μA
- Maximum Zener Impedance: 10Ω
Detailed Pin Configuration
The 1N4747A has two pins, with the cathode being connected to the case.
Functional Features
- Voltage Regulation: The 1N4747A provides a stable voltage output when operated in its reverse breakdown region.
- Voltage Reference: It can be used as a precise voltage reference in various electronic circuits.
Advantages
- Precise Voltage Regulation: Provides a stable output voltage under varying load conditions.
- Compact Size: The DO-41 package allows for easy integration into circuit designs.
Disadvantages
- Limited Power Dissipation: With a maximum power dissipation of 1.0W, it may not be suitable for high-power applications.
- Tolerance: The ±5% tolerance may not be sufficient for some precision applications.
Working Principles
The 1N4747A operates based on the principle of the Zener effect, where it maintains a constant voltage across its terminals when operated in the reverse breakdown region.
Detailed Application Field Plans
The 1N4747A finds applications in: - Voltage Regulation Circuits - Voltage Reference Circuits - Overvoltage Protection Circuits
Detailed and Complete Alternative Models
Some alternative models to the 1N4747A include: - 1N4739A (9.1V Zener Voltage) - 1N4750A (27V Zener Voltage) - BZX55C20 (20V Zener Voltage)
This comprehensive range of alternatives allows for flexibility in choosing the appropriate Zener diode for specific application requirements.
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What is the 1N4747A diode used for?
- The 1N4747A is a Zener diode commonly used for voltage regulation and voltage reference applications.
What is the voltage rating of the 1N4747A diode?
- The 1N4747A has a nominal Zener voltage of 20 volts.
What is the maximum power dissipation of the 1N4747A diode?
- The maximum power dissipation of the 1N4747A diode is 1 watt.
How does the 1N4747A diode regulate voltage?
- The 1N4747A regulates voltage by maintaining a constant output voltage across its terminals, even when the input voltage varies.
Can the 1N4747A be used for overvoltage protection?
- Yes, the 1N4747A can be used for overvoltage protection by shunting excess voltage to ground once the Zener voltage is reached.
What are typical applications of the 1N4747A diode?
- Typical applications include voltage regulation in power supplies, voltage reference circuits, and overvoltage protection in electronic systems.
What is the temperature coefficient of the 1N4747A diode?
- The temperature coefficient of the 1N4747A is typically around -2 mV/°C, indicating a relatively stable voltage reference over a range of temperatures.
What is the forward voltage drop of the 1N4747A diode?
- The forward voltage drop of the 1N4747A is typically around 1.2 volts at a specified current.
Can the 1N4747A be used in reverse bias?
- Yes, the 1N4747A can be used in reverse bias as a Zener diode to maintain a constant voltage across its terminals.
What are the key differences between the 1N4747A and other Zener diodes?
- The 1N4747A differs from other Zener diodes primarily in its Zener voltage rating and power dissipation capabilities, making it suitable for specific voltage regulation requirements.