onsemi

LM7818CT

LM7818CT Description

The LM7818CT is a fixed positive linear voltage regulator designed by onsemi. This through-hole mounted device is housed in a TO-220-3 package and is ideal for applications requiring a stable 18V output at a maximum current of 1A. The regulator operates with an input voltage range up to 35V and features a typical dropout voltage of 2V at 1A, ensuring efficient power conversion even under high load conditions. Despite its obsolescence, the LM7818CT remains a reliable choice for various industrial and consumer electronics applications.

LM7818CT Features

• Fixed Output Voltage: The LM7818CT provides a stable 18V output, making it suitable for applications requiring a fixed voltage supply.
• High Input Voltage Range: With a maximum input voltage of 35V, the regulator can handle a wide range of input voltages, enhancing its versatility.
• Low Dropout Voltage: A typical dropout voltage of 2V at 1A ensures efficient power conversion and minimal power loss, making it ideal for applications where input voltage may be close to the desired output voltage.
• Over-Temperature and Short-Circuit Protection: These protection features safeguard the regulator and connected components from damage due to excessive temperature or short circuits.
• Low Quiescent Current: The regulator operates with a quiescent current of 8mA, contributing to overall system efficiency and reduced power consumption.
• High Power Supply Rejection Ratio (PSRR): At 69dB (120Hz), the LM7818CT effectively filters out noise from the input power supply, ensuring a clean output voltage.
• Moisture Sensitivity Level 1: The device is classified as MSL 1, indicating it is unaffected by moisture, making it suitable for a wide range of environmental conditions.
• Through-Hole Mounting: The through-hole package type ensures robust mechanical stability and ease of integration into printed circuit boards.

LM7818CT Applications

The LM7818CT is well-suited for a variety of applications where a stable 18V supply is required. Some specific use cases include:

• Consumer Electronics: Ideal for powering devices such as radios, amplifiers, and other audio equipment that require a stable 18V supply.
• Industrial Control Systems: Suitable for powering control boards and sensors in industrial environments where reliability and stability are paramount.
• Telecommunications: Can be used in telecommunication equipment for powering various modules and components that operate at 18V.
• Automotive Applications: Although not specifically designed for automotive use, the LM7818CT can be used in certain automotive applications where a stable 18V supply is needed.
• Power Supply Units: The regulator can be integrated into power supply units to provide a stable voltage output for various electronic devices.

Conclusion of LM7818CT

Despite being marked as obsolete, the LM7818CT remains a robust and reliable choice for applications requiring a stable 18V output. Its low dropout voltage, high PSRR, and protection features make it a standout option in the realm of linear voltage regulators. The through-hole mounting and moisture sensitivity level 1 classification further enhance its versatility and reliability. While newer models may offer additional features, the LM7818CT continues to provide excellent performance and stability, making it a valuable component for a wide range of electronic applications.