LM1117T-3.3 Low Dropout (LDO) Voltage Regulator (Fixed 3.3V - TO-220 Package)

When your project requires a rock-solid 3.3-Volt power rail—such as when powering an ESP32, an SD card module, or modern 3.3-Volt logic sensors—from a slightly higher voltage source like a 5-Volt USB wall adapter, the LM1117T-3.3 is exactly what you need. Traditional linear regulators typically require your input voltage to be at least two to three volts higher than your desired output just to function. The LM1117 series, however, is a "Low Dropout" (LDO) regulator. This means it only requires an input voltage roughly 1.2 Volts higher than its output to maintain steady regulation, allowing you to effortlessly generate a clean 3.3 Volts straight from a standard 5-Volt line.

This specific variant is factory-calibrated to deliver a fixed 3.3-Volt output, completely eliminating the need for external voltage-adjustment resistors and simplifying your circuit. Housed in the rugged, breadboard-friendly TO-220 package, it can reliably supply up to 800 milliamps of continuous current. Whether you are adding a modern 3.3-Volt wireless module to an older 5-Volt control system or building a custom power distribution board, the LM1117 provides clean, stable power with built-in hardware safeguards.

Key Features & Functional Advantages

• Low Dropout Voltage: Only requires about 1.2 Volts of overhead to operate, making it incredibly efficient when stepping down 5-Volt logic to 3.3-Volt logic without dropping out.

• Fixed 3.3-Volt Output: Factory preset for perfect 3.3-Volt regulation, saving board space by removing the need for an external resistor divider network.

• High Output Current: Comfortably provides up to 800 milliamps of current, which is more than enough to handle the sudden power spikes required by complex Wi-Fi transceivers and microcontrollers.

• Indestructible Safety: Features built-in internal thermal shutdown and current limiting, ensuring the silicon safely turns itself off if it overheats or if the output is accidentally short-circuited.

• Classic TO-220 Package: The universal through-hole footprint allows for quick breadboard prototyping and provides a metal tab for easy attachment to an aluminum heatsink during high-current operations.

Perfect For

• Logic Level Powering: The absolute best choice for providing safe 3.3-Volt power to sensitive modern electronics, displays, and sensors running on a primary 5-Volt system.

• Wireless Modules: Delivering the necessary high-current bursts required when ESP32, ESP8266, or other heavy-draw transceivers transmit data.

• Custom Prototyping: The breadboard-friendly design allows you to easily plug it in alongside your microcontroller during the testing and development phase.

• Battery Powered Devices: Extending usable run-time in projects where a standard linear regulator would shut down due to a lack of voltage headroom as the battery naturally drains.

Technical Specifications

• Device Type: Low Dropout (LDO) Linear Voltage Regulator

• Output Type: Fixed 3.3 Volts DC

• Input Voltage Maximum: Up to 15.0 Volts DC

• Maximum Output Current: 800 milliamps

• Voltage Drop-Out: 1.2 Volts (Typical at maximum load)

• Quiescent Current: 5 milliamps (Typical baseline power draw)

• Package Type: 3-Pin TO-220 (Vertical through-hole with metal heatsink tab)

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