STMicroelectronics

L78L05ABD

L78L05ABD Description

The L78L05ABD from STMicroelectronics is a fixed 5V linear voltage regulator designed for low-power applications. Housed in an 8-pin SO package, it delivers a stable 100mA output current with an input voltage range up to 30V. This obsolete but reliable component is ROHS3 compliant and features over-current, over-temperature, and short-circuit protection, ensuring robust performance in demanding environments. With a quiescent current of 5.5mA and a power supply rejection ratio (PSRR) of 49dB at 120Hz, it offers efficient noise suppression, making it suitable for sensitive analog and digital circuits.

L78L05ABD Features

• Fixed 5V Output: Ensures stable voltage regulation for low-power devices.
• Wide Input Range (Up to 30V): Accommodates varying input sources.
• 100mA Output Current: Ideal for small-scale applications.
• Built-in Protections: Over-current, over-temperature, and short-circuit safeguards enhance reliability.
• Low Quiescent Current (5.5mA): Minimizes power consumption in standby modes.
• High PSRR (49dB): Reduces noise interference in sensitive circuits.
• Surface-Mount (SO-8) Package: Compact footprint for space-constrained designs.

L78L05ABD Applications

The L78L05ABD is well-suited for:

• Consumer Electronics: Powering microcontrollers, sensors, and low-power ICs in portable devices.
• Industrial Control Systems: Providing stable voltage to PLCs, instrumentation, and control modules.
• Automotive Electronics: Supporting infotainment systems and dashboard components.
• Embedded Systems: Ensuring reliable power for IoT nodes and battery-operated devices.
• Telecom Equipment: Regulating voltage in low-power communication modules.

Conclusion of L78L05ABD

Despite its obsolete status, the L78L05ABD remains a dependable choice for low-power, fixed 5V regulation with robust protection features. Its high PSRR, low quiescent current, and compact form factor make it ideal for noise-sensitive and space-constrained applications. Engineers seeking a cost-effective, legacy-compatible regulator for consumer, industrial, or automotive systems may still find this component valuable for prototyping or maintenance purposes.