NJR Corporation/NJRC
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NJM78L05UA
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NJM78L05UA

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Voltage Regulator
  • Characteristics: Low Dropout, 5V Output
  • Package: TO-92
  • Essence: Linear Voltage Regulator
  • Packaging/Quantity: Tape and Reel, 2000 units per reel

Specifications

  • Input Voltage Range: 7V to 35V
  • Output Voltage: 5V
  • Output Current: 100mA
  • Dropout Voltage: 2V (max)
  • Quiescent Current: 4.5mA (typ)
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The NJM78L05UA has a standard three-pin configuration:

  1. Input Pin (Vin): Connects to the input voltage source.
  2. Ground Pin (GND): Connected to the ground reference.
  3. Output Pin (Vout): Provides the regulated 5V output.

Functional Features

  • Voltage Regulation: The NJM78L05UA provides a stable 5V output voltage regardless of input voltage fluctuations.
  • Low Dropout: With a maximum dropout voltage of 2V, it can regulate the output even when the input voltage is close to the desired output voltage.
  • Short Circuit Protection: The IC includes built-in protection against short circuits, preventing damage to the device.
  • Thermal Shutdown: In case of excessive temperature, the regulator shuts down to prevent overheating.

Advantages and Disadvantages

Advantages: - Simple and easy to use. - Low dropout voltage allows for efficient regulation. - Compact TO-92 package suitable for space-constrained applications. - Built-in protection features enhance reliability.

Disadvantages: - Limited output current capability (100mA). - Not suitable for high-power applications. - Requires external capacitors for stability.

Working Principles

The NJM78L05UA is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the reference voltage (5V) with the feedback voltage from a voltage divider network connected to the output. The regulator adjusts the pass transistor's resistance to maintain a constant output voltage, compensating for changes in input voltage and load conditions.

Detailed Application Field Plans

The NJM78L05UA is commonly used in various electronic devices and applications, including:

  1. Consumer Electronics: Powering microcontrollers, sensors, and other low-power components.
  2. Automotive Electronics: Providing regulated power to sensors, actuators, and control modules.
  3. Industrial Control Systems: Used in PLCs, motor control circuits, and instrumentation systems.
  4. Telecommunications: Voltage regulation for communication modules, routers, and networking equipment.
  5. Power Supplies: As a part of low-power DC power supplies for various applications.

Detailed and Complete Alternative Models

  1. LM7805: A widely used 5V linear voltage regulator with similar specifications and pin configuration.
  2. MC78L05: Another popular 5V regulator available in various package options.
  3. AMS1117-5.0: A low dropout 5V regulator with higher output current capability.

These alternative models offer similar functionality and can be used as substitutes for the NJM78L05UA depending on specific requirements.

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Énumérez 10 questions et réponses courantes liées à l'application de NJM78L05UA dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of NJM78L05UA in technical solutions:

  1. Q: What is NJM78L05UA? A: NJM78L05UA is a voltage regulator IC that provides a fixed output voltage of +5V.

  2. Q: What is the input voltage range for NJM78L05UA? A: The input voltage range for NJM78L05UA is typically between 7V and 35V.

  3. Q: What is the maximum output current of NJM78L05UA? A: The maximum output current of NJM78L05UA is 100mA.

  4. Q: Can NJM78L05UA handle higher input voltages than its specified range? A: No, exceeding the specified input voltage range can damage the IC.

  5. Q: Is NJM78L05UA suitable for low-power applications? A: Yes, NJM78L05UA is commonly used in low-power applications where a regulated +5V supply is required.

  6. Q: Does NJM78L05UA require any external components for operation? A: Yes, NJM78L05UA requires input and output capacitors for stability and filtering.

  7. Q: Can NJM78L05UA be used as a step-down (buck) converter? A: No, NJM78L05UA is a linear voltage regulator and cannot step down voltage.

  8. Q: Can NJM78L05UA handle short-circuit conditions? A: NJM78L05UA has built-in short-circuit protection, but prolonged short-circuits can still damage the IC.

  9. Q: Can NJM78L05UA be used in automotive applications? A: Yes, NJM78L05UA is suitable for automotive applications as long as the input voltage range is within specifications.

  10. Q: Are there any alternatives to NJM78L05UA for +5V voltage regulation? A: Yes, there are other voltage regulator ICs available in the market, such as LM7805 or AMS1117, that can provide a regulated +5V output.

Please note that these answers are general and may vary depending on specific datasheet specifications and application requirements.