LM7909 Negative Voltage Regulator 9V

The LM7909 Negative Voltage Regulator 9V is a highly reliable fixed-output voltage regulator designed to provide a stable −9V supply for analog, digital, and power-sensitive circuits. Moreover, it belongs to the widely trusted 79xx series of negative voltage regulators, known for their strong thermal protection, short-circuit safety, and consistent output performance. Because original, high-quality regulators are becoming harder to find in surplus markets, the LM7909 is now considered both new and rare, making it an excellent choice for engineers, repair specialists, and system designers who require authentic components.

Additionally, the LM7909 arrives in brand-new condition, ensuring excellent electrical stability and long-term performance. Its TO-220 package offers strong thermal dissipation, which consequently improves reliability under continuous load. Furthermore, the regulator maintains precise voltage output even when input voltage or load current fluctuates, making it indispensable in audio equipment, power supplies, communication circuits, and industrial control systems.

Key Features

• Fixed −9V regulated output

• Part of the robust 79xx negative regulator family

• Built-in thermal shutdown and short-circuit protection

• Excellent line and load regulation

• Supplied as a new and rare original component

Typical Applications

• Audio amplifier circuits requiring negative rails

• Operational amplifier power supplies

• Industrial control modules and instrumentation

• Communication devices and analog signal conditioners

• Repair and restoration of regulated power systems

Furthermore, the LM7909 Negative Voltage Regulator 9V demonstrates exceptional reliability when used in circuits that demand stable power rails for clean signal processing. Consequently, engineers depend on this regulator in low-noise audio paths, precision analog circuits, and regulated dual-power supplies. Therefore, the LM7909 remains a preferred solution for both modern and legacy electronic designs. In addition, its excellent rejection of ripple and noise helps maintain clean and consistent system performance.

Datasheet Specifications

• Output Voltage: −9V fixed

• Input Voltage Range: Typically −12V to −35V

• Maximum Output Current: 1A (with adequate heatsink)

• Line Regulation: Excellent (varies by load)

• Load Regulation: High stability across output range

• Thermal Shutdown: Integrated

• Short-Circuit Protection: Yes

• Package: TO-220

• Pinout:

  1. Ground

  2. Input

  3. Output

Why This Component Is Highly Valued

• Provides stable negative voltage for precision circuits

• Ensures strong protection against faults and overheating

• Ideal for high-quality repairs and regulated power systems

• Rare, original version ensures long-term reliability