L78L33CD

Product Overview

• Category: Voltage Regulator
• Use: To regulate and stabilize voltage levels in electronic circuits
• Characteristics:
  • Low dropout voltage
  • Fixed output voltage of 3.3V
  • Maximum output current of 100mA
• Package: TO-92 (Through-Hole)
• Essence: Linear voltage regulator
• Packaging/Quantity: Available in reels or tubes, quantity varies depending on supplier

Specifications

• Input Voltage Range: 4.75V to 20V
• Output Voltage: 3.3V ±5%
• Dropout Voltage: 1.7V (typical)
• Output Current: Up to 100mA
• Quiescent Current: 5mA (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L78L33CD voltage regulator 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 L78L33CD maintains a constant output voltage of 3.3V, regardless of changes in the input voltage or load conditions.
• Low Dropout Voltage: With a dropout voltage of only 1.7V, this regulator can operate efficiently even when the input voltage is close to the desired output voltage.
• Short Circuit Protection: The device includes internal protection against short circuits, preventing damage to the regulator and the connected circuitry.
• Thermal Shutdown: In case of excessive temperature, the L78L33CD features thermal shutdown protection, ensuring safe operation under high ambient temperatures.

Advantages and Disadvantages

Advantages: - Simple to use and integrate into electronic circuits. - Low dropout voltage allows for efficient operation. - Provides a stable output voltage, suitable for powering various components.

Disadvantages: - Limited maximum output current of 100mA, restricting its use in high-power applications. - Requires external capacitors for stability, adding additional components to the circuit.

Working Principles

The L78L33CD is a linear voltage regulator that uses a pass transistor to regulate the output voltage. It operates by comparing the output voltage with a reference voltage and adjusting the pass transistor accordingly. When the output voltage drops below the desired level, the pass transistor increases its conductivity, allowing more current to flow and raising the output voltage. Conversely, if the output voltage exceeds the desired level, the pass transistor reduces its conductivity, limiting the current flow and lowering the output voltage.

Detailed Application Field Plans

The L78L33CD is commonly used in various electronic applications, including:

1. Microcontrollers: Providing a stable power supply for microcontrollers, ensuring reliable operation.
2. Sensor Modules: Regulating voltage for sensor modules, maintaining accurate readings.
3. Embedded Systems: Powering various components in embedded systems, such as memory chips and communication modules.
4. Battery-Powered Devices: Regulating voltage in battery-powered devices, extending battery life and preventing damage from voltage fluctuations.

Detailed and Complete Alternative Models

1. LM317: A versatile adjustable voltage regulator capable of providing different output voltages.
2. LM7805: A fixed 5V voltage regulator suitable for applications requiring a constant 5V supply.
3. LD1117: A low dropout voltage regulator available in various fixed output voltages.

These alternative models offer similar functionality to the L78L33CD but may have different specifications or package types. The choice of an alternative model depends on specific application requirements.

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