LD1117S50TR 5V 800mA Linear Voltage Regulator IC - STMicroelectronics

Reliable Voltage Regulation for Modern Electronics

The LD1117S50TR from STMicroelectronics represents a new standard in linear voltage regulation technology, offering engineers and designers a robust solution for stable power management in compact electronic systems. This surface-mount regulator combines high performance with essential protection features, making it ideal for applications ranging from industrial control systems to consumer electronics.

Technical Excellence in Power Management

Engineered with STMicroelectronics' advanced semiconductor technology, this fixed-output linear regulator maintains precise 5V regulation with minimal dropout voltage of just 1.2V at maximum load. Its SOT-223 package design optimizes thermal performance while maintaining compatibility with standard surface-mount assembly processes. The device's inherent stability and low quiescent current (10 mA) make it particularly suitable for battery-powered applications where energy efficiency is critical.

Design Advantages

Unlike switching regulators that generate electrical noise, the LD1117S50TR provides clean, ripple-free output essential for sensitive analog circuits and RF modules. Its integrated protection features (over-current and thermal shutdown) ensure reliable operation under abnormal conditions, while the TO-261AA package offers excellent thermal dissipation characteristics. The device's compatibility with standard 0.1µF ceramic capacitors simplifies PCB layout and reduces overall system cost.

Applications Across Industries

This versatile regulator has found its way into numerous applications including:

• Industrial automation equipment
• Medical monitoring devices
• Telecom infrastructure
• Automotive control modules
• Consumer electronics peripherals

Its ability to maintain regulation under varying load conditions makes it particularly valuable in systems with fluctuating power demands. The regulator's high-temperature operating range ensures reliability in demanding environments where standard regulators might fail.

Engineering Considerations

Designers should consider the following when implementing this regulator:

• Input capacitance requirements for stability
• Thermal management for continuous operation
• Noise sensitivity in high-precision measurement circuits
• Load transient response characteristics

When compared to similar devices in its class, the LD1117S50TR stands out through its combination of high current capability (800mA), excellent PSRR performance, and comprehensive protection features in a compact SOT-223 package.

Tags: linear voltage regulator, STMicroelectronics IC, SOT-223 package, electronic components, power management