NJM79M18FA

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Low dropout, fixed output voltage of -18V
• Package: TO-220F-4L
• Essence: Monolithic integrated circuit designed for voltage regulation
• Packaging/Quantity: Available in reels of 2,500 units

Specifications

• Input Voltage Range: -20V to -35V
• Output Voltage: -18V
• Output Current: Up to 0.5A
• Dropout Voltage: 1.2V (typical)
• Quiescent Current: 10mA (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The NJM79M18FA has a standard TO-220F-4L package with the following pin configuration:

```

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| | --| V- |-- --| IN |-- --| OUT|-- --| GND|-- |____| ```

• V-: Negative input voltage
• IN: Input voltage
• OUT: Output voltage
• GND: Ground

Functional Features

• Provides a stable -18V output voltage regardless of input voltage fluctuations
• Low dropout voltage ensures efficient regulation even with small input-output voltage differentials
• Built-in overcurrent and thermal protection mechanisms for enhanced reliability
• Compact and easy-to-use TO-220F-4L package

Advantages and Disadvantages

Advantages: - Stable output voltage - Low dropout voltage - Overcurrent and thermal protection - Compact package

Disadvantages: - Fixed output voltage may not be suitable for all applications - Limited output current capability

Working Principles

The NJM79M18FA is a voltage regulator IC that utilizes a negative feedback mechanism to maintain a constant -18V output voltage. It operates by comparing the output voltage with a reference voltage and adjusting the internal circuitry to ensure the desired output voltage is maintained, even in the presence of input voltage variations.

Detailed Application Field Plans

The NJM79M18FA can be used in various applications where a stable -18V voltage supply is required. Some potential application fields include:

1. Audio Amplifiers: Provides a regulated power supply for audio amplifiers, ensuring consistent performance.
2. Industrial Control Systems: Used in control circuits to provide a reliable -18V voltage source for powering various components.
3. Instrumentation: Suitable for powering analog sensors and measurement devices that require a precise and stable negative voltage reference.
4. Automotive Electronics: Can be employed in automotive systems that require a regulated -18V supply, such as in-car entertainment systems or electronic control units.

Detailed and Complete Alternative Models

• LM7918: Negative voltage regulator with -18V fixed output voltage, available in TO-220 package.
• MC79M18: Monolithic voltage regulator IC with -18V output voltage, offered in TO-220 package.
• KA79M18: Negative voltage regulator IC providing -18V output voltage, packaged in TO-220F-4L.

(Note: The above alternative models are provided for reference and may have slight differences in specifications and features.)

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