LK112M25TR

Overview

The LK112M25TR is a positive fixed linear voltage regulator manufactured by STMicroelectronics, delivering a fixed output of 2.5V with a maximum load current of 150mA. It features a low dropout voltage of 0.35V at full load and maintains a quiescent current of 250µA. The device offers a power supply rejection ratio (PSRR) of 55dB at 400Hz and supports an input voltage range up to 14V. Packaged in a compact SOT-23-5 surface-mount case, it includes internal overcurrent and thermal shutdown protection for reliable operation across a temperature range of -30°C to 125°C.

Feature Summary

• Integrates internal PNP pass transistor for low-dropout performance
• Includes enable control pin compatible with TTL or CMOS logic levels
• Provides comprehensive protection against short circuits and overheating

Applications

• Battery-powered portable electronic devices requiring efficient power management
• Noise-sensitive analog circuits needing stable low-noise voltage references
• Embedded systems utilizing microcontrollers and sensors within the specified voltage range

Procurement Notes

Verify the specific suffix 'M25' confirms the 2.5V fixed output variant, as the LK112 family includes other voltage options. Confirm the 'TR' suffix indicates tape-and-reel packaging if reel quantity is required for assembly. Check RoHS3 compliance status and ensure the SOT-23-5 footprint matches the design layout. Validate that the operating temperature range meets the environmental requirements of the final application.

Selection Notes

Select this component when a precise 2.5V rail is needed from inputs up to 14V with moderate current demands. Consider the 250µA quiescent current for battery life calculations. Ensure the input-output differential exceeds the minimum dropout voltage under expected load conditions. Verify that the SOT-23-5 package size fits the available board space and thermal constraints.

Part Context

This part belongs to the LK112 series of low-dropout linear regulators from STMicroelectronics. The series is characterized by low noise, high PSRR, and integrated shutdown functionality. Other variants in the family offer different fixed output voltages while sharing similar electrical characteristics and package options, allowing for standardized design across multiple power rails.

Replacement Considerations

Direct substitutes include other LK112xx variants with different fixed output voltages if the system architecture allows voltage adjustment. Cross-reference with generic 150mA LDOs in SOT-23-5 packages, ensuring pin compatibility and matching electrical specifications such as dropout voltage and PSRR.