TILM1117MPX-3.3/NOPB

Overview

The LM1117MPX-3.3/NOPB is a widely used 3.3 V low-dropout (LDO) linear regulator from Texas Instruments. It provides a fixed 3.3 V output in a commonly used SMD variant and is stocked by many distributors. The device is intended for moderate-current embedded power rails and legacy designs that need a simple, low-cost regulator solution.

Why Choose This Part

This part is inexpensive, widely available, and offered in familiar SMD packages and footprints, making it easy to source and replace. It requires only a small number of external components, so it is simple to design into PCBs and breadboard breakouts. Broad distribution and a long history of use mean lots of reference designs and community knowledge are available.

Applications

Getting Started

Start by reading the LM1117 datasheet for recommended input and output capacitor types and values and for thermal limits. Pay attention to layout and thermal dissipation on the PCB (thermal pad or copper area) and ensure the recommended output capacitor ESR is met for regulator stability. If prototyping, use a breakout or evaluation board with the same footprint to validate thermal and dropout behavior before finalizing the PCB.

LM1117MPX Family

Comparing specs that differ across variants. The current part is highlighted.

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