MC78L12ACDR2G

Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Fixed Output Voltage: 12V - Low Dropout Voltage - Low Quiescent Current - Thermal Overload Protection - Short Circuit Current Limiting

Package: SOIC-8

Essence: The MC78L12ACDR2G is a voltage regulator IC that provides a fixed output voltage of 12V. It is designed to regulate and stabilize the input voltage to ensure a constant output voltage, even when the input voltage fluctuates.

Packaging/Quantity: The MC78L12ACDR2G is available in a small outline integrated circuit (SOIC) package with 8 pins. It is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: Up to 35V
• Output Voltage: 12V
• Output Current: Up to 100mA
• Dropout Voltage: 1.7V (typical)
• Quiescent Current: 5mA (typical)
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The MC78L12ACDR2G has 8 pins arranged as follows:

```

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| | --| Vout GND|-- --| Vin NC |-- --| Vin GND|-- --| Vin GND|-- --| Vin GND|-- --| Vin GND|-- --| Vin GND|-- |___________| ```

Functional Features

• Fixed Output Voltage: The MC78L12ACDR2G provides a stable output voltage of 12V, regardless of variations in the input voltage.
• Low Dropout Voltage: The regulator has a low dropout voltage, which means it can maintain the desired output voltage even when the input voltage is close to the output voltage.
• Low Quiescent Current: The IC consumes very little current when there is no load, resulting in efficient power usage.
• Thermal Overload Protection: The MC78L12ACDR2G incorporates thermal overload protection, preventing damage due to excessive heat.
• Short Circuit Current Limiting: It has built-in short circuit current limiting to protect the regulator and connected components from damage in case of a short circuit.

Advantages and Disadvantages

Advantages: - Provides a stable 12V output voltage - Low dropout voltage ensures efficient regulation - Low quiescent current for power efficiency - Thermal overload protection prevents overheating - Short circuit current limiting protects components

Disadvantages: - Limited output current capacity (up to 100mA) - Not suitable for high-power applications

Working Principles

The MC78L12ACDR2G is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the reference voltage with the feedback voltage and adjusts the pass transistor accordingly to maintain a constant output voltage. When the input voltage exceeds the desired output voltage, the excess voltage is dropped across the pass transistor, resulting in a regulated output voltage.

Detailed Application Field Plans

The MC78L12ACDR2G is commonly used in various electronic devices and circuits where a stable 12V power supply is required. Some typical application fields include:

1. Consumer Electronics: Used in audio/video equipment, set-top boxes, and gaming consoles.
2. Automotive: Used in automotive electronics, such as car audio systems and dashboard displays.
3. Industrial Control Systems: Used in control panels, sensors, and actuators.
4. Telecommunications: Used in communication devices, routers, and modems.
5. Power Supply Units: Used in low-power DC power supplies for various applications.

Detailed and Complete Alternative Models

1. LM7812: A popular alternative from Texas Instruments with similar specifications and pin configuration.
2. UA7812: An alternative from Fairchild Semiconductor offering comparable performance.
3. L78L12ABD: Another alternative from STMicroelectronics with a slightly higher output current capability.

These alternatives can be considered based on specific requirements and availability.

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