A popular low-dropout (LDO) 3.3 V linear voltage regulator based on the LD1117 in a TO-220 package. With approximately 1 V dropout and up to 800 mA output current, it cleanly steps down 5–15 V supplies to a regulated 3.3 V with 1% accuracy.

Built-in current limiting and thermal shutdown provide robust protection. The TO-220 package allows heatsinking for higher-current applications, dissipating up to 2 W without an external heatsink.

Key Features

• Low Dropout – ~1 V dropout (vs 2 V for 78XX series)
• 800 mA Output – High current capacity with proper heatsinking
• 3.3 V ±1% Regulation – Clean, accurate output voltage
• Input Range – 4.3–15 V DC
• Built-In Protection – Current limiting and thermal shutdown
• TO-220 Package – Easy to heatsink for higher power dissipation

Specifications

• Output Voltage – 3.3 V ±1%
• Max Output Current – 800 mA
• Dropout Voltage – ~1 V
• Input Voltage – 4.3–15 V
• Quiescent Current – 5 mA
• Thermal Resistance – 62.5 °C/W junction-to-air (TO-220)
• Max Power Dissipation – ~2 W without heatsink

Ideal For

• Stepping 5 V supplies down to 3.3 V for microcontrollers and sensors
• Projects requiring more current than TO-92 regulators can provide
• Breadboard and through-hole PCB designs

Package Contents

• 1× LD1117-3.3 Voltage Regulator (TO-220)