LM1117GS 5V 1A Low-Dropout Voltage Regulator SOT-223

The LM1117GS 5V 1A is a fixed-output, low-dropout (LDO) linear voltage regulator in a compact SOT-223 package. Designed for reliable 5 V rails up to 1 A, it suits a wide range of electronics components, modules, and power stages in Arduino, Raspberry Pi peripherals, sensors, and other microcontroller-based designs.

✨ Key Features

• Fixed 5 V output with up to 1 A load current
• Low dropout voltage for improved efficiency and headroom
• High-precision output regulation for stable logic rails
• Integrated protections: thermal shutdown and current limiting
• Compact SOT-223 surface-mount package for easy PCB integration

📐 Technical Specifications

• Output Voltage: 5 V (fixed)
• Maximum Output Current: 1 A (thermal and layout dependent)
• Dropout Voltage: Low; typically around ~1.1 V at high load
• Package: SOT-223 (TO-261)
• Protections: Over-temperature shutdown and over-current/short-circuit

🧰 Typical Applications

• High-efficiency power supply stages for 5 V logic rails
• Battery-powered devices and portable electronics
• Consumer electronics and telecommunication equipment
• Microcontroller systems (Arduino, AVR, STM32) and sensor modules
• Raspberry Pi peripherals and 5 V accessory rails

⚙️ Design Notes and Best Practices

• Headroom: Ensure the input voltage (VIN) exceeds VOUT by at least the dropout voltage. For a 5 V output, plan for VIN ≳ 6.2 V under full load.
• Power dissipation: P ≈ (VIN − VOUT) × IOUT. Manage thermal performance with copper pour and adequate airflow. Example: 12 V to 5 V at 1 A ≈ 7 W → significant heat.
• Decoupling: Use input and output capacitors close to the pins. A typical starting point is ≥10 µF on OUT and ≥10 µF on IN. Follow the manufacturer’s datasheet for capacitor types and ESR; low-ESR tantalum/electrolytic (plus a small ceramic for HF) is a common choice.
• Stability: Maintain recommended capacitor values/ESR to prevent oscillation.
• Load considerations: Some LDOs may require a small minimum load to maintain regulation; verify in the specific LM1117GS datasheet.

📎 Package and Pinout (SOT-223)

• Pin 1: GND
• Pin 2: VOUT
• Pin 3: VIN
• Tab: Connected to VOUT (tie to copper for better heat spreading)

✅ Why Choose This Regulator?

• Reliable 5 V rail for electronics projects and production designs
• Simple, robust solution for powering microcontrollers, logic ICs, and sensor modules
• Ideal drop-in for many Arduino and Raspberry Pi accessory boards needing a clean 5 V supply

Optimize your power path with the LM1117GS 5V 1A Voltage Regulator—a dependable LDO for modern electronics components, modules, and embedded systems where clean, regulated voltage is essential. ⚡