LM1117MPX-33NOPB

Overview

The LM1117MPX-33NOPB is a fixed-output low-dropout linear regulator manufactured by onsemi. It provides a stable 3.3V output with a maximum load current of 800mA. The device features a maximum input voltage rating of 20V and operates within an ambient temperature range of 0°C to 125°C. It utilizes a SOT-223 surface-mount package, specifically TO-261-4 or TO-261AA configuration. Key electrical characteristics include a typical power supply rejection ratio (PSRR) of 64dB at 120Hz and a static current of 10mA. The regulator incorporates internal overcurrent and thermal overload protection mechanisms to ensure reliable operation under fault conditions.

Feature Summary

• Provides a fixed positive 3.3V output voltage suitable for standard logic levels
• Integrates internal overcurrent limiting and thermal shutdown protection circuits
• Utilizes a compact surface-mount SOT-223 package for efficient board space utilization

Applications

• General-purpose power management in embedded systems
• Pre-regulator stages for switching converters
• Battery-powered equipment requiring stable voltage rails

Procurement Notes

Verify the manufacturer designation carefully, as the LM1117 series is produced by multiple vendors including Texas Instruments and onsemi. Confirm that the specific part number corresponds to the onsemi manufacturing source rather than other suppliers. Ensure the ordering suffix matches the required tape-and-reel packaging format if automated assembly is planned. Cross-reference the datasheet revision to confirm compatibility with your design specifications.

Selection Notes

Select this component when a fixed 3.3V rail is required with moderate current demands up to 800mA. Consider the thermal dissipation capabilities inherent to the SOT-223 package relative to the expected power loss. Evaluate the dropout voltage requirements against the minimum input voltage available in the system. Verify that the operating temperature range meets the environmental constraints of the final application.

Part Context

This device belongs to the LM1117 family of low-dropout regulators, designed for applications requiring efficient linear regulation with minimal external components. The MPX suffix indicates a specific surface-mount variant optimized for high-volume manufacturing processes. The NOPB designation signifies compliance with lead-free standards and halogen-free material requirements, aligning with modern environmental regulations for electronic components.

Replacement Considerations

LM1117MPX-3.3/NOPB from Texas Instruments offers identical electrical specifications and pinout compatibility. Other LDOs providing 3.3V output and similar current ratings may serve as functional substitutes if package dimensions and thermal performance are verified.