NJM7812FA

Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Fixed Output, Positive Polarity
• Package: TO-220
• Essence: Regulates input voltage to a fixed output voltage
• Packaging/Quantity: Bulk packaging, typically sold in reels or tubes

Specifications

• Input Voltage Range: 14V - 35V
• Output Voltage: +12V
• Output Current: Up to 1A
• Dropout Voltage: 2V (maximum)
• Line Regulation: 0.01%/V
• Load Regulation: 0.5%
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The NJM7812FA has three pins:

1. Input Pin (Pin 1): Connects to the input voltage source.
2. Ground Pin (Pin 2): Connected to the ground reference.
3. Output Pin (Pin 3): Provides the regulated +12V output.

Functional Features

• Fixed Output Voltage: The NJM7812FA maintains a constant +12V output voltage regardless of changes in the input voltage or load conditions.
• Overcurrent Protection: The IC includes built-in protection against excessive current flow, preventing damage to the device and connected components.
• Thermal Shutdown: In case of excessive temperature rise, the IC automatically shuts down to prevent overheating and potential damage.
• Short Circuit Protection: The NJM7812FA is designed to withstand short circuits on the output pin without causing any harm to the device.

Advantages and Disadvantages

Advantages: - Simple and reliable voltage regulation solution. - Wide input voltage range allows for versatile applications. - Built-in protection features enhance system safety.

Disadvantages: - Limited output current capability (up to 1A). - Dropout voltage of 2V may not be suitable for low voltage applications.

Working Principles

The NJM7812FA is a linear voltage regulator that utilizes a series pass transistor to regulate the output voltage. It operates by comparing the output voltage with a reference voltage and adjusting the pass transistor accordingly to maintain a constant output voltage of +12V.

Application Field Plans

The NJM7812FA finds applications in various electronic systems where a stable +12V power supply is required. Some common application fields include:

1. Power Supply Units (PSUs) for computers and other electronic devices.
2. Automotive electronics, such as car audio systems and dashboard displays.
3. Industrial control systems and automation equipment.
4. Battery charging circuits.
5. Audio amplifiers and preamplifiers.

Alternative Models

• LM7812: A widely used alternative from Texas Instruments.
• MC7812: An alternative from ON Semiconductor.
• UA7812: Another alternative from Fairchild Semiconductor.

These alternatives offer similar functionality and specifications to the NJM7812FA and can be used interchangeably in most applications.

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