L7809CD2T

Product Overview

Category

L7809CD2T belongs to the category of voltage regulators.

Use

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

Characteristics

• Input Voltage Range: 11V to 35V
• Output Voltage: 9V
• Maximum Output Current: 1.5A
• Dropout Voltage: 2V
• Operating Temperature Range: -40°C to +125°C
• Package Type: TO-220
• Mounting Style: Through Hole

Package

L7809CD2T comes in a TO-220 package, which provides good thermal conductivity and electrical insulation.

Essence

The essence of L7809CD2T is to provide a stable and regulated 9V output voltage from a wide range of input voltages.

Packaging/Quantity

L7809CD2T is typically packaged in reels or tubes. The quantity per reel/tube varies depending on the manufacturer but is usually around 100 pieces.

Specifications

• Input Voltage Range: 11V to 35V
• Output Voltage: 9V
• Output Current: 1.5A
• Dropout Voltage: 2V
• Line Regulation: ±0.2%
• Load Regulation: ±0.4%
• Quiescent Current: 6mA
• Ripple Rejection Ratio: 62dB
• Thermal Resistance (Junction to Case): 5°C/W
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

L7809CD2T has three pins:

1. Input (Pin 1): This pin is connected to the input voltage source.
2. Ground (Pin 2): This pin is connected to the ground reference.
3. Output (Pin 3): This pin provides the regulated 9V output voltage.

Functional Features

• Regulates the output voltage to a constant 9V.
• Provides protection against overcurrent and overtemperature conditions.
• Low dropout voltage ensures efficient operation even with low input voltages.
• High ripple rejection ratio minimizes the impact of input voltage fluctuations on the output.

Advantages

• Easy to use and integrate into electronic circuits.
• Wide input voltage range allows compatibility with various power sources.
• Stable and accurate output voltage regulation.
• Protection features enhance reliability and prevent damage to connected components.

Disadvantages

• Dropout voltage of 2V may limit its usability in applications with very low input voltages.
• Heat dissipation may be required due to the TO-220 package's limited thermal conductivity.

Working Principles

L7809CD2T 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's resistance to maintain a constant 9V output.

Detailed Application Field Plans

L7809CD2T finds applications in various electronic devices and systems, including:

1. Power supplies for microcontrollers and digital circuits.
2. Battery charging circuits.
3. Audio amplifiers and preamplifiers.
4. Industrial control systems.
5. Automotive electronics.
6. LED lighting systems.

Detailed and Complete Alternative Models

Some alternative models to L7809CD2T include:

1. LM7809: Similar specifications and pin configuration, available in different packages.
2. MC7809: Comparable performance, suitable for similar applications.
3. UA7809: Equivalent functionality, offered by another manufacturer.

These alternative models can be considered based on specific requirements and availability.

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