L78L09ACD

Product Overview

• Category: Linear Voltage Regulator
• Use: Provides a stable output voltage of 9V from an input voltage source
• Characteristics: Low dropout voltage, high current capability, thermal overload protection
• Package: TO-252 (DPAK)
• Essence: Voltage regulation for electronic circuits
• Packaging/Quantity: Available in tape and reel packaging, quantity varies based on supplier

Specifications

• Input Voltage Range: 10.5V to 35V
• Output Voltage: 9V
• Output Current: Up to 100mA
• Dropout Voltage: 1.7V (typical)
• Quiescent Current: 4.5mA (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L78L09ACD has three pins:

1. Input (VIN): Connects to the input voltage source.
2. Ground (GND): Connected to the ground reference of the circuit.
3. Output (VOUT): Provides the regulated 9V output.

Functional Features

• Voltage Regulation: The L78L09ACD maintains a constant output voltage of 9V, even with varying input voltages.
• Low Dropout Voltage: The regulator can operate with a small voltage difference between the input and output, minimizing power dissipation.
• High Current Capability: Capable of supplying up to 100mA of current to the load.
• Thermal Overload Protection: Built-in protection mechanism prevents the device from overheating.

Advantages and Disadvantages

Advantages: - Simple and easy to use. - Provides a stable output voltage. - Suitable for low-power applications. - Offers thermal overload protection.

Disadvantages: - Limited output current capability. - Dropout voltage may cause power dissipation in certain applications.

Working Principles

The L78L09ACD is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to maintain a constant 9V output. The regulator operates by dissipating excess input voltage as heat, which is why it has a dropout voltage requirement.

Detailed Application Field Plans

The L78L09ACD is commonly used in various electronic circuits where a stable 9V power supply is required. Some typical application fields include:

1. Battery-Powered Devices: Provides regulated power to microcontrollers, sensors, and other low-power components in portable devices.
2. Audio Amplifiers: Used as a power supply for audio amplifiers, ensuring a consistent voltage for optimal performance.
3. Industrial Control Systems: Provides regulated power to control circuitry in industrial automation systems.
4. LED Lighting: Used to power LED strips or modules, maintaining a constant brightness level.

Detailed and Complete Alternative Models

1. LM7809: A popular alternative from Texas Instruments with similar specifications.
2. MC78L09: Another alternative from ON Semiconductor, offering comparable performance.
3. UA78L09: An alternative from Fairchild Semiconductor, widely used in various applications.

These alternatives can be considered based on availability, pricing, and specific requirements of the application.

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