STMicroelectronics L4940V5 Linear Voltage Regulator | 5V 1.5A TO-220AB

High-Performance Linear Voltage Regulation with STMicroelectronics L4940V5

Power management is the backbone of modern electronic systems, and STMicroelectronics' L4940V5 linear voltage regulator stands as a testament to precision engineering. This fixed-output 5V regulator combines robust performance with comprehensive protection features, making it an ideal choice for demanding applications in industrial control, embedded systems, and consumer electronics. As a member of ST's extensive portfolio of power management solutions, this IC exemplifies the balance between technical excellence and practical implementation.

Key Technical Specifications

Engineered in the popular TO-220AB package, this regulator offers exceptional thermal performance while maintaining compatibility with standard heatsinking solutions. The device's advanced design achieves a remarkable 68dB PSRR (Power Supply Rejection Ratio) at 120Hz, ensuring clean power delivery even in electrically noisy environments. Its comprehensive protection suite includes integrated safeguards against over-temperature conditions, reverse polarity, and short circuits - features that significantly enhance system reliability.

Performance Advantages

The L4940V5's low dropout voltage of just 0.9V at maximum load current enables efficient operation in battery-powered applications where every millivolt counts. This characteristic, combined with its wide operating temperature range (-40°C to 150°C), makes it particularly suitable for automotive electronics and industrial control systems that require dependable performance in challenging environments. The device's through-hole mounting configuration simplifies PCB design while ensuring mechanical stability in vibration-prone applications.

When compared to similar regulators in its class, the L4940V5 distinguishes itself through its combination of high current capability and compact packaging. Its 1.5A output current capacity surpasses many competing solutions while maintaining comparable thermal characteristics. The integrated reverse polarity protection eliminates the need for external blocking diodes, reducing both component count and board space requirements.

Design Considerations

Designers will appreciate the regulator's ease of implementation, requiring only minimal external components for stable operation. The fixed 5V output eliminates the need for resistor dividers, reducing potential error sources and simplifying design validation. For applications requiring higher output voltages, ST offers the device in adjustable versions that maintain the same robust feature set.

This regulator's 50mA maximum supply current specification ensures minimal power consumption in standby modes, making it suitable for energy-conscious designs. The device's thermal shutdown circuitry provides automatic protection against overload conditions, with automatic recovery ensuring continued operation once normal conditions resume.

Applications & Use Cases

The L4940V5's versatility shines across a wide spectrum of applications including:

• Industrial automation equipment
• Embedded computing platforms
• Consumer electronics peripherals
• Automotive infotainment systems
• Test and measurement instruments

When sourcing this component, ensure you're obtaining genuine STMicroelectronics parts through authorized distributors. The regulator's tube packaging facilitates automated PCB assembly while maintaining component protection during storage and handling. With 10,300 units currently available in stock, procurement lead times remain optimal for both prototyping and production requirements.

Tags: Power Management ICs, Linear Regulators, TO-220 Package, Industrial Electronics, Voltage Regulation