onsemi

LM78M18CT

LM78M18CT Description

The LM78M18CT is a fixed positive linear voltage regulator designed by onsemi, featuring a robust set of specifications tailored for power management applications. This regulator offers a fixed output voltage of 18V and is capable of delivering up to 500mA of output current. It is designed to operate within an input voltage range up to 35V, ensuring reliable performance across a wide range of input conditions. The LM78M18CT is housed in a through-hole TO220-3 package, making it suitable for applications requiring robust mechanical stability and ease of integration into printed circuit boards.

LM78M18CT Features

• Fixed Output Voltage: The LM78M18CT provides a stable 18V output, ensuring consistent power delivery to connected devices.
• High Input Voltage Range: With a maximum input voltage of 35V, this regulator can handle a broad spectrum of input voltages, enhancing its versatility.
• Low Dropout Voltage: The regulator features a typical dropout voltage of 2V at 500mA, allowing it to maintain regulation even when the input voltage is close to the output voltage.
• Low Quiescent Current: The LM78M18CT operates with a quiescent current of just 6mA, minimizing power consumption during idle periods.
• High PSRR: The regulator boasts a power supply rejection ratio (PSRR) of 70dB at 120Hz, effectively filtering out noise from the input power supply.
• Protection Features: Over-temperature and short-circuit protection ensure the regulator's longevity and reliability under adverse conditions.
• Operating Temperature Range: The LM78M18CT is designed to operate reliably within a temperature range of 0°C to 125°C, making it suitable for a variety of environmental conditions.
• Moisture Sensitivity Level: With an MSL rating of 1 (Unlimited), the regulator is highly resistant to moisture, enhancing its durability in humid environments.

LM78M18CT Applications

The LM78M18CT is ideal for applications requiring a stable and reliable power supply with a fixed output voltage. Its robust design and low dropout voltage make it particularly suitable for:

• Consumer Electronics: Providing stable power to devices such as radios, amplifiers, and other consumer electronics that require a fixed 18V supply.
• Industrial Equipment: Ensuring reliable power delivery in industrial control systems, sensors, and actuators.
• Telecommunications: Supplying power to communication modules and peripherals that need a consistent voltage source.
• Automotive Electronics: Serving as a reliable power source for automotive applications where the input voltage can vary significantly.

Conclusion of LM78M18CT

The LM78M18CT is a versatile and reliable linear voltage regulator that offers a fixed 18V output with a maximum output current of 500mA. Its low dropout voltage, high PSRR, and robust protection features make it an excellent choice for a wide range of applications. Despite its obsolete status, the LM78M18CT remains a valuable component for engineers and designers seeking a dependable power management solution. Its compatibility with through-hole mounting and broad operating temperature range further enhance its appeal for various industrial and consumer applications.