SG7812AIG

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics:
  • Input Voltage Range: 14V to 35V
  • Output Voltage: 12V
  • Maximum Output Current: 1.5A
  • Package Type: TO-220
  • Essence: Linear voltage regulator
  • Packaging/Quantity: Tape and Reel, 1000 units per reel

Specifications

• Input Voltage Range: 14V to 35V
• Output Voltage: 12V ± 4%
• Output Current: Up to 1.5A
• Dropout Voltage: 2V (typical)
• Line Regulation: 0.2% (typical)
• Load Regulation: 0.4% (typical)
• Operating Temperature Range: -40°C to +125°C
• Package Type: TO-220
• Package Dimensions: 10.16mm x 15.24mm x 4.57mm

Detailed Pin Configuration

The SG7812AIG has three pins:

1. Pin 1: Input Voltage (VIN)
2. Pin 2: Ground (GND)
3. Pin 3: Output Voltage (VOUT)

Functional Features

• Provides a stable 12V output voltage regardless of input voltage fluctuations.
• Built-in thermal shutdown protection prevents overheating.
• Short-circuit protection safeguards the device and connected components.
• Low dropout voltage ensures efficient power conversion.
• High ripple rejection ratio minimizes noise in the output signal.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows for versatile applications.
• Compact TO-220 package facilitates easy integration into various circuits.
• Excellent line and load regulation ensures stable output under varying conditions.
• Robust thermal protection prevents damage due to excessive heat.
• Cost-effective solution for voltage regulation needs.

Disadvantages

• Linear voltage regulators are less efficient compared to switching regulators.
• Limited output current capacity may not be suitable for high-power applications.
• Dropout voltage can cause power dissipation and reduce efficiency in certain scenarios.

Working Principles

The SG7812AIG is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It operates by comparing the reference voltage with the feedback voltage obtained from a voltage divider network connected to the output. Any difference between the two voltages is amplified and used to control the pass transistor, adjusting its resistance to maintain a stable output voltage.

Detailed Application Field Plans

The SG7812AIG is commonly used in various electronic devices and systems requiring a regulated 12V power supply. Some typical application areas include:

1. Power supplies for microcontrollers and digital circuits.
2. Automotive electronics.
3. Industrial control systems.
4. Audio amplifiers and preamplifiers.
5. Battery charging circuits.
6. LED lighting systems.

Detailed and Complete Alternative Models

1. LM7812: A widely used alternative from Texas Instruments.
2. MC7812: An alternative option from ON Semiconductor.
3. UA7812: Another popular choice manufactured by Fairchild Semiconductor.
4. L78M12: A similar device offered by STMicroelectronics.
5. KA7812: An alternative model available from Samsung Electronics.

These alternatives provide similar functionality and specifications, allowing users to choose the most suitable option based on availability and specific requirements.

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