LD1117S18TR

Overview

The LD1117S18TR is a fixed-output low-dropout positive voltage regulator manufactured by STMicroelectronics. It provides a stable 1.8 V output with a maximum current capability of 950 mA. The device operates within an input voltage range up to 15 V and features a typical dropout voltage of 1 V. It utilizes an SOT-223-3 surface-mount package and maintains a quiescent current of 5 mA. The unit supports operation temperatures from 0°C to +125°C, ensuring reliable performance in industrial environments.

Feature Summary

• NPN pass transistor design ensures high efficiency by directing quiescent current primarily into the load rather than dissipating it internally.
• Internal circuitry includes thermal limit and current limit protections to safeguard the device under fault conditions.
• Requires only a standard 10 μF minimum capacitor for stability, simplifying external component selection.

Applications

• Battery-powered systems requiring efficient linear regulation
• Communication equipment power supplies
• Portable instrumentation circuits

Procurement Notes

Verify the specific suffix TR indicates tape-and-reel packaging configuration when sourcing. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the SOT-223-3 footprint matches the target PCB layout constraints. Cross-reference the exact part number against the latest STMicroelectronics datasheet to confirm active status and pinout definitions.

Selection Notes

Select this component when a fixed 1.8 V rail is required with moderate current demands up to 950 mA. The SOT-223 package offers thermal advantages over smaller packages while maintaining space efficiency compared to through-hole options. Consider the 1 V dropout characteristic relative to the minimum input voltage available in the system design.

Part Context

This part belongs to the LD1117 series of low-dropout regulators produced by STMicroelectronics. The series encompasses various fixed voltage outputs and adjustable versions, designed for applications needing efficient power management. The S18 variant specifically targets the 1.8 V logic level requirement common in digital circuits.

Replacement Considerations

Check for LD1117S18DT as a potential alternative if different reel specifications are needed, provided the electrical characteristics remain identical. Verify pin compatibility before substituting with other LDO families.