STMicroelectronics

L78M09ABV

L78M09ABV Description

The L78M09ABV is a fixed positive linear voltage regulator designed for a wide range of power management applications. Manufactured by STMicroelectronics, this regulator offers a fixed output voltage of 9V with a maximum input voltage of 35V. It is capable of delivering a continuous output current of 500mA, making it suitable for various electronic systems requiring stable power supply.

This regulator is housed in a TO220AB package, which is known for its robustness and ease of integration in through-hole mounting applications. The L78M09ABV features a low quiescent current of 6mA, ensuring high efficiency even under light load conditions. It also boasts a power supply rejection ratio (PSRR) of 56dB at 120Hz, which helps in minimizing output voltage variations due to input ripple.

L78M09ABV Features

• Fixed Positive Output Voltage: Provides a stable 9V output, ideal for applications requiring a consistent power supply.
• High Input Voltage Range: Capable of handling input voltages up to 35V, offering flexibility in power source selection.
• Over Current Protection: Ensures the regulator and connected devices are protected from excessive current, enhancing reliability.
• Over Temperature Protection: Prevents thermal runaway, safeguarding the regulator from damage due to excessive heat.
• Short Circuit Protection: Protects against short circuits, ensuring the regulator remains functional even in adverse conditions.
• Low Quiescent Current: With a quiescent current of 6mA, the L78M09ABV maintains high efficiency, even at low load levels.
• High PSRR: A PSRR of 56dB at 120Hz ensures minimal output voltage ripple, contributing to stable performance.
• Through Hole Mounting: The TO220AB package is designed for through-hole mounting, facilitating easy integration into PCBs.
• Compliance and Status: The L78M09ABV is REACH unaffected and ROHS3 compliant, ensuring it meets environmental and regulatory standards.

L78M09ABV Applications

The L78M09ABV is well-suited for a variety of applications where a stable and reliable power supply is essential. Some specific use cases include:

• Consumer Electronics: Ideal for powering devices such as radios, small appliances, and portable electronics that require a stable 9V supply.
• Industrial Equipment: Suitable for control systems, sensors, and actuators that need a reliable power source with protection features.
• Telecommunications: Can be used in communication devices and infrastructure where a consistent power supply is crucial.
• Automotive Electronics: Applicable in automotive systems where a stable 9V supply is required for various electronic components.

Conclusion of L78M09ABV

The L78M09ABV from STMicroelectronics is a robust and reliable linear voltage regulator designed to deliver a stable 9V output with a maximum input voltage of 35V. Its features, including over current, over temperature, and short circuit protection, make it a versatile choice for a wide range of applications. The low quiescent current and high PSRR ensure efficient and stable performance, even under varying load conditions. Despite its obsolete status, the L78M09ABV remains a valuable component for applications requiring a dependable power supply.