L78M12CDT-TR

Product Overview

Category

L78M12CDT-TR belongs to the category of voltage regulators.

Use

It is primarily used to regulate and stabilize voltage in electronic circuits.

Characteristics

• Input Voltage Range: 14V to 35V
• Output Voltage: 12V
• Output Current: Up to 500mA
• Dropout Voltage: 2V (typical)
• Operating Temperature Range: -40°C to +125°C
• Package Type: DPAK (TO-252)

Essence

The L78M12CDT-TR is an integrated circuit voltage regulator that provides a fixed 12V output voltage from a higher input voltage. It is designed to ensure a stable power supply for various electronic devices.

Packaging/Quantity

The L78M12CDT-TR is available in a DPAK (TO-252) package. It is typically sold in reels or tubes, with a quantity of 2500 units per reel.

Specifications

• Input Voltage Range: 14V to 35V
• Output Voltage: 12V
• Output Current: Up to 500mA
• Dropout Voltage: 2V (typical)
• Line Regulation: ±0.2%
• Load Regulation: ±0.4%
• Quiescent Current: 5mA (typical)
• Ripple Rejection Ratio: 62dB (typical)
• Thermal Shutdown Protection: Yes
• Short Circuit Protection: Yes

Pin Configuration

The L78M12CDT-TR has three pins:

1. Input (VIN): This pin is connected to the input voltage source.
2. Ground (GND): This pin is connected to the ground reference.
3. Output (VOUT): This pin provides the regulated 12V output voltage.

Functional Features

• Voltage Regulation: The L78M12CDT-TR ensures a stable 12V output voltage regardless of input voltage fluctuations.
• Thermal Shutdown Protection: It incorporates thermal shutdown protection to prevent damage due to excessive temperature.
• Short Circuit Protection: The device is equipped with short circuit protection, safeguarding the circuit from damage in case of a short circuit.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows for flexibility in various applications.
• High ripple rejection ratio ensures a clean and stable output voltage.
• Thermal shutdown and short circuit protection enhance reliability and safety.

Disadvantages

• Limited output current capability (up to 500mA) may not be suitable for high-power applications.
• Dropout voltage of 2V may result in higher power dissipation.

Working Principles

The L78M12CDT-TR operates based on the principle of linear voltage regulation. It uses a series pass transistor to regulate the output voltage. When the input voltage exceeds the desired output voltage, the excess voltage is dropped across the pass transistor, ensuring a constant output voltage.

Detailed Application Field Plans

The L78M12CDT-TR finds applications in various electronic systems where a stable 12V power supply is required. Some common application fields include:

1. Consumer Electronics: Used in audio/video equipment, set-top boxes, and gaming consoles.
2. Industrial Automation: Employed in control systems, motor drives, and power supplies.
3. Automotive Electronics: Utilized in automotive infotainment systems, lighting controls, and engine management systems.
4. Telecommunications: Found in routers, switches, and network equipment.
5. Medical Devices: Used in medical instruments, patient monitoring systems, and diagnostic equipment.

Detailed and Complete Alternative Models

1. LM7812: A widely used alternative with similar specifications and pin configuration.
2. MC7812: Another popular alternative with comparable performance characteristics.
3. UA7812: An alternative model offering a fixed 12V output voltage.

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

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