LF50CDT-TR

Overview

The LF50CDT-TR is a positive fixed linear voltage regulator manufactured by STMicroelectronics, belonging to the LFxx series. It provides a fixed output voltage of 5 V with a maximum continuous output current of 500 mA. The device supports an input voltage up to 16 V and operates within a junction temperature range of -40 °C to +125 °C. Key electrical characteristics include a typical dropout voltage of 0.7 V at full load, a quiescent current of 1 mA, and power supply rejection ratios ranging from 76 dB at 120 Hz to 60 dB at 10 kHz. It is housed in a surface-mount DPAK (TO-252-3) package.

Feature Summary

• Integrated overcurrent protection and thermal shutdown mechanisms for enhanced operational safety under fault conditions.
• Low quiescent current consumption of 1 mA, contributing to efficient power management in battery-operated systems.
• High power supply rejection ratio (PSRR) performance across standard audio frequency ranges to minimize noise coupling.

Applications

• General-purpose power supply regulation in embedded electronic circuits
• Pre-regulation stages for switching power supplies requiring stable DC rails
• Power conditioning for microcontroller and logic circuit biasing

Procurement Notes

Verify the specific suffix 'CDT' against the manufacturer's official datasheet to confirm the exact package variant and tape-and-reel specifications. Ensure that the ordering documentation explicitly references the LF50CDT-TR part number to avoid confusion with other LF50 series packages such as TO-220 or SOT-89 variants which may have different pinout or thermal characteristics.

Selection Notes

Select this component when a fixed 5 V rail is required with moderate current demands up to 500 mA. The DPAK package offers a balance between thermal dissipation capabilities and space efficiency for surface-mount designs. Consider the 16 V maximum input rating and the 0.7 V dropout voltage to ensure adequate headroom for the specific application's input source and load requirements.

Part Context

This component belongs to the LF50 family of low-dropout regulators produced by STMicroelectronics. These devices are designed as direct replacements for older industry-standard linear regulators, offering improved thermal performance and reliability in modern surface-mount applications while maintaining compatibility with established circuit topologies.

Replacement Considerations

Publicly confirmed substitute part numbers include NCP5501DT50RKG from onsemi. Verify pinout compatibility and thermal resistance values before substitution.