STMicroelectronics L4979D013TR Linear Voltage Regulator - 5V Fixed Output, 150mA, 8-SOIC Package

STMicroelectronics L4979D013TR: Precision 5V Linear Regulation for Demanding Applications

In modern electronic systems where stable power delivery and compact design are critical, STMicroelectronics' L4979D013TR emerges as a reliable solution for engineers seeking precision voltage regulation. This fixed 5V linear regulator, housed in an 8-SOIC surface-mount package, combines advanced protection features with automotive-grade thermal performance to address diverse industrial and consumer applications.

Technical Excellence in Voltage Regulation

Operating with a maximum input voltage capability of 31V, this regulator demonstrates exceptional headroom for fluctuating power sources while maintaining a rock-solid 5V output. The device's 0.4V dropout voltage at 150mA load current enables efficient operation in battery-powered systems where every millivolt counts. Its 55dB PSRR at 100Hz ensures clean power delivery even in electrically noisy environments, making it ideal for precision analog circuits and digital logic.

Advanced System Integration Features

Engineers will appreciate the device's built-in enable pin for power sequencing, reset output for system reliability, and watchdog timer for critical applications. These integrated control features reduce external component requirements while enhancing system robustness. The comprehensive protection suite featuring over-temperature shutdown and short-circuit current limiting ensures trouble-free operation in harsh environments.

With its miniature 3.90mm-wide SOIC footprint and tape & reel packaging, the L4979D013TR aligns perfectly with automated PCB assembly requirements. The surface-mount design enables high-density board layouts while maintaining excellent thermal dissipation characteristics through its optimized package geometry.

Design Advantages Across Multiple Industries

This regulator shines in applications requiring stable 5V power rails, including:

• Industrial control systems with fluctuating DC inputs
• Automotive electronics needing reliable power conditioning
• Portable medical devices requiring low quiescent current
• Smart home automation controllers
• Industrial sensor networks

The device's 3mA maximum supply current and 20µA quiescent draw make it particularly attractive for energy-conscious designs. Its wide -40°C to 150°C operating temperature range meets automotive and industrial grade reliability requirements without derating.

Performance Comparison and Design Considerations

When compared to alternative solutions like the LM2940 or AP1117, the L4979D013TR offers superior PSRR performance and more comprehensive system integration features while maintaining comparable dropout characteristics. Designers should consider its enable pin functionality for implementing power sequencing in multi-rail systems, and leverage the watchdog timer for safety-critical applications.

For optimal performance, STMicroelectronics recommends using a minimum 10µF ceramic input capacitor and 2.2µF output capacitor with proper PCB layout practices to minimize noise coupling. The device's thermal shutdown feature provides inherent protection against sustained overload conditions.

Future-Proof Power Management Solution

As electronics continue trending toward higher integration and lower power consumption, the L4979D013TR's combination of precision regulation, compact packaging, and robust protection features positions it as an ideal choice for next-generation designs. Its compliance with RoHS standards and availability through major distribution channels ensure long-term supply stability for production environments.

Tags: Fixed Voltage Regulator, Low Dropout, Power Management IC, Surface Mount, Automotive Electronics