L7808ACD2T

Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Fixed Output Voltage: 8V - Maximum Output Current: 1.5A - Input Voltage Range: 10V to 35V - Dropout Voltage: 2V - Operating Temperature Range: -40°C to +125°C

Package: D²PAK (TO-263)

Essence: The L7808ACD2T is a voltage regulator IC that provides a fixed output voltage of 8V. It is commonly used in electronic circuits to regulate and stabilize the voltage supply.

Packaging/Quantity: The L7808ACD2T is available in a D²PAK package, which is a surface-mount package with three pins. It is typically sold in reels or tubes containing multiple units.

Specifications

The specifications of the L7808ACD2T are as follows:

• Output Voltage: 8V ±4%
• Output Current: Up to 1.5A
• Input Voltage Range: 10V to 35V
• Dropout Voltage: 2V (typical)
• Line Regulation: 0.04% (typical)
• Load Regulation: 0.3% (typical)
• Quiescent Current: 6mA (typical)
• Thermal Shutdown Protection: Yes
• Short Circuit Protection: Yes

Pin Configuration

The L7808ACD2T has three pins arranged as follows:

```

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

• V_in: Input voltage pin
• GND: Ground pin
• V_out: Output voltage pin

Functional Features

The L7808ACD2T offers the following functional features:

1. Voltage Regulation: It maintains a stable output voltage of 8V, regardless of variations in the input voltage or load conditions.
2. Thermal Shutdown Protection: The IC includes a built-in thermal shutdown mechanism that protects it from overheating by disabling the output when the temperature exceeds a certain threshold.
3. Short Circuit Protection: In case of a short circuit on the output side, the IC limits the current to protect itself and the connected components.

Advantages and Disadvantages

Advantages: - Fixed output voltage ensures stability in electronic circuits. - High maximum output current of 1.5A allows for powering various components. - Wide input voltage range provides flexibility in different applications. - Thermal shutdown and short circuit protection enhance reliability and safety.

Disadvantages: - Fixed output voltage may not be suitable for all applications requiring variable voltages. - Dropout voltage of 2V may limit its use in low voltage applications.

Working Principles

The L7808ACD2T is a linear voltage regulator based on the principle of a series pass transistor. It uses a feedback mechanism to compare the output voltage with a reference 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 L7808ACD2T can be used in various applications where a stable 8V power supply is required. Some common application fields include:

1. Power Supply Units (PSUs): It can be used in PSUs to provide a regulated 8V output for powering microcontrollers, sensors, and other electronic components.
2. Automotive Electronics: The IC can be employed in automotive electronics systems to regulate voltage for various modules such as infotainment systems, lighting controls, and engine management units.
3. Industrial Control Systems: It finds applications in industrial control systems where a stable voltage is crucial for the proper functioning of sensors, actuators, and other control devices.

Detailed and Complete Alternative Models

Some alternative models that can be used as substitutes for the L7808ACD2T include:

1. LM7808: This is a popular alternative from Texas Instruments with similar specifications and pin configuration.
2. UA7808: Manufactured by Fairchild Semiconductor, it offers comparable performance to the L7808ACD2T.
3. MC7808: A voltage regulator IC from ON Semiconductor that can be used as an alternative.

These alternative models provide similar functionality and can be chosen based on availability, pricing, and specific application requirements.

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