NJR Corporation/NJRC
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NJM79L18UA
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NJM79L18UA

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Voltage Regulator
  • Characteristics: Low dropout voltage, high ripple rejection, low quiescent current
  • Package: TO-92 (3-pin package)
  • Essence: Linear voltage regulator
  • Packaging/Quantity: Available in reels of 2,500 units

Specifications

  • Input Voltage Range: -35V to -8V
  • Output Voltage: -18V
  • Dropout Voltage: 1.7V (typical)
  • Quiescent Current: 5mA (typical)
  • Ripple Rejection Ratio: 60dB (typical)
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The NJM79L18UA IC has three pins:

  1. Pin 1: Input (VIN) - Connects to the input voltage source.
  2. Pin 2: Ground (GND) - Connected to the ground reference.
  3. Pin 3: Output (VOUT) - Provides the regulated output voltage.

Functional Features

  • Voltage Regulation: The NJM79L18UA regulates the input voltage to a stable -18V output voltage.
  • Low Dropout Voltage: The device maintains regulation even when the input voltage is close to the output voltage.
  • High Ripple Rejection: It effectively filters out noise and ripple present in the input voltage.
  • Low Quiescent Current: The IC consumes minimal current when in standby mode, conserving power.

Advantages and Disadvantages

Advantages: - Compact and easy-to-use package - Wide operating temperature range - Good ripple rejection ratio - Low quiescent current consumption

Disadvantages: - Limited input voltage range - Dropout voltage may affect efficiency in certain applications

Working Principles

The NJM79L18UA is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the reference voltage with the feedback voltage and adjusts the pass transistor accordingly to maintain a stable -18V output.

Detailed Application Field Plans

The NJM79L18UA finds applications in various electronic devices, including: 1. Power supplies for audio amplifiers 2. Battery-powered systems 3. Industrial control systems 4. Automotive electronics 5. Instrumentation equipment

Detailed and Complete Alternative Models

  1. LM317: Adjustable positive voltage regulator
  2. LM7805: Fixed 5V positive voltage regulator
  3. LT1086: Adjustable low dropout voltage regulator
  4. MC78M05: Fixed 5V positive voltage regulator

These alternative models offer similar functionality and can be used as substitutes for the NJM79L18UA in different applications.

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Перелічіть 10 типових запитань і відповідей, пов’язаних із застосуванням NJM79L18UA у технічних рішеннях

Sure! Here are 10 common questions and answers related to the application of NJM79L18UA in technical solutions:

  1. Q: What is NJM79L18UA? A: NJM79L18UA is a voltage regulator IC that provides a fixed output voltage of -18V.

  2. Q: What is the input voltage range for NJM79L18UA? A: The input voltage range for NJM79L18UA is typically between -35V and -5V.

  3. Q: What is the maximum output current of NJM79L18UA? A: The maximum output current of NJM79L18UA is 100mA.

  4. Q: Can NJM79L18UA be used in both AC and DC applications? A: Yes, NJM79L18UA can be used in both AC and DC applications.

  5. Q: Is NJM79L18UA suitable for battery-powered devices? A: Yes, NJM79L18UA is suitable for battery-powered devices as it has low quiescent current consumption.

  6. Q: Can NJM79L18UA handle short-circuit conditions? A: Yes, NJM79L18UA has built-in short-circuit protection to prevent damage under short-circuit conditions.

  7. Q: Does NJM79L18UA require any external components for operation? A: Yes, NJM79L18UA requires an input capacitor and an output capacitor for stable operation.

  8. Q: What is the operating temperature range of NJM79L18UA? A: The operating temperature range of NJM79L18UA is typically between -40°C and +125°C.

  9. Q: Can NJM79L18UA be used in automotive applications? A: Yes, NJM79L18UA is suitable for automotive applications as it meets the required specifications.

  10. Q: Are there any alternative voltage regulators similar to NJM79L18UA? A: Yes, there are alternative voltage regulators available in the market, such as LM79L18, MC79L18, etc., that provide a similar -18V output voltage.

Please note that these answers are general and may vary depending on the specific datasheet and application requirements of NJM79L18UA.