NJM79M12FA

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Low dropout, fixed output voltage of -12V, high ripple rejection, compact size
• Package: TO-220F-4L
• Essence: The NJM79M12FA is a voltage regulator IC that provides a stable -12V output voltage for various electronic applications.
• Packaging/Quantity: Available in reels of 2,500 units

Specifications

• Input Voltage Range: -14V to -35V
• Output Voltage: -12V
• Output Current: Up to 500mA
• Dropout Voltage: 2V (typical)
• Ripple Rejection: 70dB (typical)
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The NJM79M12FA has a standard TO-220F-4L package with the following pin configuration:

```

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| | --| Vin GND|-- Pin 1: Ground --| Vout NC |-- Pin 2: No Connection --| NC Vout|-- Pin 3: Output Voltage (-12V) --| GND Vin|-- Pin 4: Input Voltage |___________| ```

Functional Features

• Provides a stable -12V output voltage regardless of input voltage fluctuations
• Low dropout voltage ensures efficient regulation even with low input voltages
• High ripple rejection minimizes noise interference in the output signal
• Compact TO-220F-4L package allows for easy integration into various circuit designs

Advantages and Disadvantages

Advantages: - Stable output voltage - Low dropout voltage - High ripple rejection - Compact size

Disadvantages: - Limited output current capacity (up to 500mA) - Requires external capacitors for stability

Working Principles

The NJM79M12FA is a linear voltage regulator that utilizes a negative feedback mechanism to maintain a constant -12V output voltage. It consists of a series pass transistor, error amplifier, and voltage reference. The input voltage is regulated by adjusting the resistance of the series pass transistor to ensure a stable -12V output.

Detailed Application Field Plans

The NJM79M12FA is commonly used in various electronic applications where a stable -12V voltage supply is required. Some typical application fields include:

1. Audio Amplifiers: Provides a regulated power supply for audio amplifiers, ensuring consistent performance and minimizing noise.
2. Industrial Control Systems: Used in control circuits to provide a reliable -12V voltage source for sensors, actuators, and other components.
3. Automotive Electronics: Suitable for automotive applications such as dashboard displays, lighting systems, and motor control circuits.
4. Telecommunications: Used in communication equipment to regulate voltages for signal processing, data transmission, and power management.

Detailed and Complete Alternative Models

1. LM7912: Similar voltage regulator IC with a fixed -12V output voltage. Available in various package options.
2. MC79M12: Negative voltage regulator with a fixed -12V output. Offers higher output current capability.
3. LT1963A-12: Adjustable negative voltage regulator with a wide input voltage range and low dropout voltage.

These alternative models provide similar functionality and can be considered based on specific requirements and availability.

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