LD1117S50CTR

Overview

The LD1117S50CTR is a fixed-output low-dropout positive voltage regulator manufactured by STMicroelectronics. It provides a stable 5.0 V output with a maximum current capability of 950 mA. The device operates within an input voltage range up to 15 V and maintains performance across temperatures from 0 °C to +125 °C. Packaged in SOT-223-3 for surface mount applications, it features internal current and thermal limiting protections. The regulator ensures tight output voltage tolerance of ±1% at 25 °C and utilizes a minimum 10 μF capacitor for stability.

Feature Summary

• Fixed 5.0 V output with high efficiency NPN pass transistor design
• Integrated internal current and thermal limit protection mechanisms
• Low dropout voltage characteristic ensuring efficient power regulation
• Surface mount SOT-223 package optimized for thermal performance

Applications

• DC/DC converter step-down post-regulation stages
• Battery-powered equipment power supplies
• General-purpose embedded system voltage regulation

Procurement Notes

Verify the specific suffix 'CTR' against the official STMicroelectronics datasheet to confirm reel packaging specifications and tape-and-reel dimensions. Ensure the component matches the required SOT-223-3 pinout configuration. Cross-reference the manufacturing date code and lot number with quality documentation to confirm compliance with RoHS directives and material declarations prior to integration into production assemblies.

Selection Notes

Select this component when a fixed 5.0 V rail is required with currents approaching 1 A. The SOT-223 package offers superior thermal dissipation compared to smaller SMD options. Verify that the input-to-output voltage differential remains within the specified dropout limits to maintain regulation. Consider the ±1% tolerance requirement for precision analog circuits or digital logic power rails where tighter voltage accuracy is critical for system stability.

Part Context

This part belongs to the LD1117 family of low-dropout regulators, which includes adjustable and various fixed voltage versions. The series is designed for applications requiring high efficiency and compact footprint. The SOT-223 variant specifically targets surface-mount designs needing robust thermal handling. It serves as a direct replacement for older linear regulators in space-constrained portable electronics and industrial control modules.

Replacement Considerations

Check for LD1117S50TTR as a potential alternative with identical electrical characteristics but potentially different packaging or reel specifications. Verify pin compatibility and thermal resistance values before substituting.