NJM78L20A

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Low Dropout, Positive Fixed Voltage Regulator
• Package: TO-92 (3-pin package)
• Essence: Provides a stable output voltage of 20V with low dropout voltage
• Packaging/Quantity: Available in reels or tubes, quantity varies based on manufacturer

Specifications

• Input Voltage Range: 7V to 25V
• Output Voltage: 20V
• Output Current: Up to 100mA
• Dropout Voltage: 2V (maximum)
• Quiescent Current: 5mA (maximum)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The NJM78L20A has three pins:

1. Input Pin (VIN): Connects to the input voltage source.
2. Ground Pin (GND): Connected to the ground reference.
3. Output Pin (VOUT): Provides the regulated output voltage.

Functional Features

• Voltage Regulation: The NJM78L20A regulates the input voltage to a fixed 20V output.
• Low Dropout Voltage: With a maximum dropout voltage of 2V, it can maintain regulation even when the input voltage is close to the desired output voltage.
• Short Circuit Protection: The IC includes internal short circuit protection to prevent damage in case of a short circuit at the output.
• Thermal Shutdown: It incorporates thermal shutdown protection to prevent overheating and potential damage.

Advantages and Disadvantages

Advantages: - Compact and easy-to-use package - Low dropout voltage ensures efficient regulation - Internal short circuit and thermal protection enhance reliability

Disadvantages: - Limited output current capability (up to 100mA) - Not suitable for high-power applications

Working Principles

The NJM78L20A is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the reference voltage with a fraction of the output voltage and adjusts the pass transistor accordingly to maintain a stable output voltage.

Detailed Application Field Plans

The NJM78L20A is commonly used in various electronic devices and applications, including but not limited to:

1. Power supply circuits for low-power microcontrollers and digital ICs.
2. Battery-powered devices requiring a stable 20V voltage source.
3. Audio amplifiers and preamplifiers.
4. Voltage regulators for analog sensors and signal conditioning circuits.

Detailed and Complete Alternative Models

1. LM78L20: Similar low dropout voltage regulator with a TO-92 package.
2. MC78L20: Another 20V fixed voltage regulator available in various packages.
3. L78L20: Positive voltage regulator with a higher output current capability.

These alternative models provide similar functionality and can be considered as substitutes for the NJM78L20A based on specific requirements.

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