NJR Corporation/NJRC
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NJM7912FA
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NJM7912FA

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Voltage Regulator
  • Characteristics: Fixed Negative Voltage Regulator, -12V Output
  • Package: TO-220F
  • Essence: Monolithic IC with three-terminal linear voltage regulator
  • Packaging/Quantity: Tube packaging, 50 pieces per tube

Specifications

  • Input Voltage Range: -14V to -35V
  • Output Voltage: -12V
  • Output Current: Up to 1A
  • Dropout Voltage: 2V (typical)
  • Line Regulation: 0.01%/V (typical)
  • Load Regulation: 0.1% (typical)
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The NJM7912FA has a standard three-pin configuration:

  1. Pin 1: Input (VIN) - Connects to the input voltage source.
  2. Pin 2: Ground (GND) - Common ground reference for the circuit.
  3. Pin 3: Output (VOUT) - Provides the regulated -12V output.

Functional Features

  • Fixed Output Voltage: The NJM7912FA provides a stable -12V output regardless of input voltage fluctuations.
  • Overcurrent Protection: The IC incorporates overcurrent protection to safeguard against excessive load currents.
  • Thermal Shutdown: In case of excessive temperature, the IC shuts down to prevent damage.
  • Short-Circuit Protection: The device is designed to withstand short-circuits without damage.

Advantages and Disadvantages

Advantages: - Simple to use and integrate into various electronic circuits. - Reliable and stable voltage regulation. - Offers protection features for enhanced safety. - Suitable for a wide range of applications.

Disadvantages: - Limited output current capacity (up to 1A). - Requires external components for proper operation. - Not suitable for high-power applications.

Working Principles

The NJM7912FA is a linear voltage regulator that utilizes a negative feedback mechanism to maintain a constant -12V output. It employs a series pass transistor to regulate the output voltage by adjusting the current flow through it. The internal circuitry compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to maintain the desired output voltage.

Detailed Application Field Plans

The NJM7912FA finds application in various electronic systems where a stable -12V power supply is required. Some common application fields include:

  1. Power Supply Units (PSUs) for audio amplifiers and other audio equipment.
  2. Industrial control systems requiring a regulated negative voltage source.
  3. Automotive electronics, such as car audio systems and dashboard displays.
  4. Telecommunication equipment, including routers and switches.
  5. Test and measurement instruments, where precise voltage regulation is essential.

Detailed and Complete Alternative Models

  1. LM7912: A popular alternative from Texas Instruments with similar specifications and pin configuration.
  2. MC7912: An alternative from ON Semiconductor offering comparable performance characteristics.
  3. KA7912: Another alternative from Fairchild Semiconductor, widely used in various applications.

These alternatives can be considered based on availability, pricing, and specific requirements of the application.

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Listen Sie 10 häufige Fragen und Antworten im Zusammenhang mit der Anwendung von NJM7912FA in technischen Lösungen auf

Sure! Here are 10 common questions and answers related to the application of NJM7912FA in technical solutions:

  1. Q: What is NJM7912FA? A: NJM7912FA is a voltage regulator IC that provides a fixed output voltage of -12V.

  2. Q: What is the input voltage range for NJM7912FA? A: The input voltage range for NJM7912FA is typically between -14V to -35V.

  3. Q: What is the maximum output current of NJM7912FA? A: The maximum output current of NJM7912FA is 1A.

  4. Q: Can NJM7912FA be used as a positive voltage regulator? A: No, NJM7912FA is specifically designed as a negative voltage regulator.

  5. Q: How does NJM7912FA handle thermal protection? A: NJM7912FA has built-in thermal shutdown protection to prevent overheating.

  6. Q: Is an external heat sink required for NJM7912FA? A: It depends on the power dissipation and ambient temperature. In some cases, an external heat sink may be necessary.

  7. Q: Can NJM7912FA be used in automotive applications? A: Yes, NJM7912FA is suitable for automotive applications as it can operate within the specified temperature range.

  8. Q: What is the typical dropout voltage of NJM7912FA? A: The typical dropout voltage of NJM7912FA is around 2V.

  9. Q: Can NJM7912FA be used in parallel to increase the output current? A: No, NJM7912FA should not be used in parallel as it may cause instability and uneven load sharing.

  10. Q: What are some common applications of NJM7912FA? A: NJM7912FA is commonly used in various electronic devices, such as audio amplifiers, power supplies, and industrial control systems, where a stable -12V voltage is required.

Please note that these answers are general and may vary depending on the specific datasheet and application requirements of NJM7912FA.