L78L09ACZ

Product Overview

• Category: Voltage Regulator
• Use: To regulate and stabilize the output voltage in electronic circuits
• Characteristics:
  • Fixed output voltage of 9V
  • Low dropout voltage
  • High ripple rejection ratio
  • Thermal overload protection
• Package: TO-92 (Through-Hole)
• Essence: Linear voltage regulator
• Packaging/Quantity: Available in reels or tubes, quantity depends on manufacturer

Specifications

• Input Voltage Range: 10.5V to 35V
• Output Voltage: 9V
• Output Current: Up to 100mA
• Dropout Voltage: 2V (max)
• Ripple Rejection Ratio: 62dB (typ)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L78L09ACZ has three pins:

1. Input (Vin): Connects to the input voltage source.
2. Ground (GND): Connected to the ground reference.
3. Output (Vout): Provides the regulated output voltage.

Functional Features

• Regulates the output voltage to a fixed 9V.
• Provides a stable output even with varying input voltage.
• Protects against thermal overload, preventing damage to the device.
• Filters out high-frequency noise, ensuring a clean output signal.

Advantages

• Simple and easy to use.
• Low dropout voltage allows for efficient regulation.
• High ripple rejection ratio ensures a clean output signal.
• Thermal overload protection enhances reliability.

Disadvantages

• Limited output current capability (up to 100mA).
• Requires an input voltage higher than the desired output voltage.

Working Principles

The L78L09ACZ is a linear voltage regulator that uses a series pass transistor to maintain a constant output voltage. It compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to regulate the output. The device dissipates excess voltage as heat, which is why it has a maximum dropout voltage specification.

Detailed Application Field Plans

The L78L09ACZ is commonly used in various electronic applications, including:

1. Power supply circuits for microcontrollers and other low-power devices.
2. Battery-powered devices requiring a stable 9V supply.
3. Audio amplifiers and preamplifiers.
4. Voltage regulators for analog circuits.
5. Automotive electronics.

Detailed and Complete Alternative Models

• LM7809: Similar specifications and functionality, available in different packages.
• MC7809: Equivalent voltage regulator from another manufacturer.
• UA7809: Another alternative with comparable characteristics.

These alternative models can be used as substitutes for the L78L09ACZ depending on availability and specific requirements.

Word count: 346 words