L78L33ABD

Product Overview

• Category: Voltage Regulator
• Use: To regulate and stabilize voltage levels in electronic circuits
• Characteristics: Low dropout, fixed output voltage, compact size
• Package: TO-220, DPAK, or SO-8
• Essence: Linear voltage regulator
• Packaging/Quantity: Available in tape and reel packaging, quantity varies based on supplier

Specifications

• Input Voltage Range: 4.75V to 20V
• Output Voltage: 3.3V
• Output Current: Up to 100mA
• Dropout Voltage: 1.7V (typical)
• Line Regulation: ±0.2% (typical)
• Load Regulation: ±0.4% (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L78L33ABD 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 output voltage.

Functional Features

• Voltage Regulation: The L78L33ABD maintains a constant output voltage of 3.3V, regardless of input voltage fluctuations.
• Low Dropout: With a dropout voltage of only 1.7V, it can operate efficiently even when the input voltage is close to the desired output voltage.
• Short Circuit Protection: The device includes internal current limiting and thermal shutdown features to protect against short circuits and excessive temperature.

Advantages and Disadvantages

Advantages: - Simple and easy to use. - Compact size allows for integration into space-constrained designs. - Low dropout voltage enables efficient operation. - Provides stable output voltage.

Disadvantages: - Limited output current capacity (up to 100mA). - Not suitable for high-power applications.

Working Principles

The L78L33ABD is a linear voltage regulator that uses a 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 output voltage of 3.3V. The device dissipates excess input voltage as heat, which is why it has a maximum operating temperature limit.

Detailed Application Field Plans

The L78L33ABD is commonly used in various electronic devices and circuits, including:

1. Microcontrollers: Provides a stable power supply for microcontrollers, ensuring reliable operation.
2. Digital Circuits: Regulates voltage levels for digital logic circuits, preventing damage from voltage fluctuations.
3. Sensor Modules: Supplies regulated power to sensor modules, ensuring accurate and consistent measurements.
4. Battery-Powered Devices: Maintains a constant voltage level in battery-powered devices, maximizing their performance and lifespan.

Detailed and Complete Alternative Models

1. LM1117-3.3: Similar to L78L33ABD, but with higher output current capacity (up to 800mA).
2. AMS1117-3.3: Another alternative with similar characteristics and pin configuration.
3. NCP1117-3.3: Offers low dropout voltage and higher output current capability (up to 1A).

These alternative models can be considered based on specific application requirements and desired performance characteristics.

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