STMicroelectronics

L78M18ABDT

L78M18ABDT Description

The L78M18ABDT is a linear voltage regulator designed by STMicroelectronics, offering a fixed output voltage of 18V and a maximum output current of 500mA. This regulator is housed in a DPAK package, making it suitable for surface-mount applications. Despite being marked as obsolete, the L78M18ABDT remains a reliable choice for specific applications due to its robust design and performance characteristics. It features a maximum input voltage of 35V and a quiescent current of 6mA, ensuring efficient power management. The regulator also includes protection features such as over-current, over-temperature, and short-circuit protection, enhancing its reliability and durability.

L78M18ABDT Features

• Fixed Output Voltage: The L78M18ABDT provides a stable output voltage of 18V, ensuring consistent power supply to connected devices.
• High Input Voltage Range: With a maximum input voltage of 35V, this regulator can handle a wide range of input voltages, making it versatile for various applications.
• Low Quiescent Current: The regulator operates with a quiescent current of only 6mA, minimizing power consumption and improving overall efficiency.
• Protection Features: Over-current, over-temperature, and short-circuit protection ensure the regulator's longevity and protect connected circuits from damage.
• High PSRR: The regulator boasts a power supply rejection ratio (PSRR) of 53dB at 120Hz, effectively filtering out noise and ripple from the input voltage.
• Surface-Mount Compatibility: The DPAK package allows for surface-mount assembly, making it suitable for modern PCB designs and compact applications.
• Compliance: The L78M18ABDT is REACH unaffected and ROHS3 compliant, ensuring it meets environmental and regulatory standards.

L78M18ABDT Applications

The L78M18ABDT is ideal for applications requiring a stable 18V supply with moderate current capabilities. Its robust design and protection features make it suitable for:

• Power Supply Modules: Providing a stable voltage source for various electronic devices.
• Industrial Equipment: Ensuring reliable power supply in harsh industrial environments.
• Consumer Electronics: Powering devices that require a fixed voltage and moderate current.
• Automotive Applications: Offering stable power supply in automotive systems where voltage fluctuations are common.

Conclusion of L78M18ABDT

The L78M18ABDT, despite being marked as obsolete, remains a reliable and efficient linear voltage regulator. Its fixed 18V output, high input voltage range, and low quiescent current make it suitable for a variety of applications. The inclusion of over-current, over-temperature, and short-circuit protection ensures the regulator's longevity and reliability. The DPAK package and surface-mount compatibility further enhance its versatility for modern electronic designs. While newer models may offer additional features, the L78M18ABDT continues to be a dependable choice for applications requiring a stable 18V supply.