STMicroelectronics

L78S05CV

L78S05CV Description

The L78S05CV from STMicroelectronics is a fixed +5V linear voltage regulator designed to deliver a robust 2A output current with an input voltage range up to 35V. Housed in a TO-220AB package, this obsolete but reliable component remains a practical choice for legacy designs or applications requiring high-current, low-dropout regulation. It operates within a 0°C to 150°C temperature range, making it suitable for industrial and automotive environments. The regulator features over-current, over-temperature, and short-circuit protection, ensuring robust performance under fault conditions. With a quiescent current of 8mA and a PSRR of 54dB (120Hz), it offers stable output with minimal noise, ideal for sensitive analog or digital circuits.

L78S05CV Features

• Fixed 5V Output: Precision-regulated voltage for consistent performance.
• High Current Capacity: Supports 2A continuous output, outperforming many standard 78xx series regulators.
• Wide Input Range: Accepts up to 35V, accommodating fluctuating supply voltages.
• Built-in Protections: Includes over-current, over-temperature, and short-circuit safeguards.
• Low Noise: 54dB PSRR at 120Hz reduces ripple in power-sensitive applications.
• Through-Hole Mounting: TO-220AB package for easy PCB integration and heat dissipation.
• RoHS3 Compliant: Meets environmental standards despite obsolete status.

L78S05CV Applications

• Industrial Control Systems: Powering microcontrollers, sensors, and actuators in harsh environments.
• Automotive Electronics: Voltage stabilization for infotainment systems or ECUs.
• Legacy Equipment Repair: Replacement for aging 5V regulators in older designs.
• Embedded Systems: Reliable power for FPGAs, DSPs, and analog circuits requiring clean 5V rails.
• DIY Electronics: Bench power supplies or prototyping where high current is needed.

Conclusion of L78S05CV

The L78S05CV is a rugged, high-current linear regulator offering stable 5V output with robust protection features. While marked obsolete, its 2A capability, wide input range, and thermal resilience make it a viable option for industrial, automotive, and legacy applications. Engineers seeking a cost-effective, high-performance alternative to switching regulators in noise-sensitive systems may still find value in this component. For new designs, consider modern equivalents, but for existing systems, the L78S05CV remains a dependable workhorse.