NJM78L18A

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Low Dropout, Fixed Output Voltage
• Package: TO-92, SOT-89
• Essence: Linear Voltage Regulator
• Packaging/Quantity: Tape and Reel, 1000 pieces per reel

Specifications

• Input Voltage Range: 7V to 20V
• Output Voltage: 18V
• Output Current: 100mA
• Dropout Voltage: 1.7V (typical)
• Quiescent Current: 5mA (typical)
• Line Regulation: 0.2% (typical)
• Load Regulation: 0.4% (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The NJM78L18A has three pins:

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

Functional Features

• Voltage Regulation: The NJM78L18A regulates the input voltage to a fixed 18V output voltage.
• Low Dropout: It operates with a low dropout voltage of 1.7V, allowing it to regulate even when the input voltage is close to the desired output voltage.
• Short Circuit Protection: The IC includes built-in short circuit protection, preventing damage in case of a short circuit on the output side.
• Thermal Shutdown: It incorporates thermal shutdown protection, which disables the regulator if the temperature exceeds the safe operating limits.

Advantages and Disadvantages

Advantages: - Compact package options (TO-92, SOT-89) - Low dropout voltage - Short circuit protection - Thermal shutdown protection

Disadvantages: - Limited output current capability (100mA)

Working Principles

The NJM78L18A is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to maintain a stable output voltage of 18V.

Detailed Application Field Plans

The NJM78L18A is commonly used in various electronic devices and applications, including:

1. Power Supplies: It can be used as a voltage regulator in power supply circuits to provide a stable 18V output for powering other components.
2. Audio Amplifiers: The NJM78L18A can be employed in audio amplifier circuits to ensure a consistent power supply voltage for optimal audio performance.
3. Industrial Control Systems: It finds application in industrial control systems where a regulated voltage is required for reliable operation of sensors, actuators, and other control components.
4. Automotive Electronics: The IC can be utilized in automotive electronics to regulate voltage for various subsystems, such as lighting systems or dashboard displays.

Detailed and Complete Alternative Models

Some alternative models to the NJM78L18A include:

1. LM78L18: Manufactured by Texas Instruments, this IC offers similar specifications and features.
2. MC78L18: Produced by ON Semiconductor, it is another alternative with comparable characteristics.
3. UA78L18: Manufactured by Fairchild Semiconductor, this IC also provides a fixed 18V output voltage.

These alternatives can be considered based on availability, pricing, and specific requirements of the application.

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