Adafruit
3.3V 800mA Linear Voltage Regulator - LD1117-3.3 TO-220
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 cu...
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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)
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- PCB
- A printed circuit board (PCB) is a board, usually rigid, with etched copper tracks that connect electronic components together without loose wiring. Components are mounted on the board and signals route between them through the copper layout.
- Power dissipation
- Power dissipation is electrical energy being turned into heat inside a component. It matters because too much heat can reduce efficiency, affect reliability, or require a larger component or better cooling.
- through-hole
- A mounting style where the component leads pass through holes in a circuit board and are soldered on the other side. Through-hole parts are often easier to handle and solder by hand, which is useful for classroom and hobby projects.
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