LK112SM18TR

Overview

The LK112SM18TR is a fixed positive low-dropout linear regulator manufactured by STMicroelectronics, delivering a precise 1.8 V output with a maximum current capacity of 200 mA. It operates within an input voltage range of 2.5 V to 14 V and maintains a maximum dropout voltage of 500 mV at full load. The device features a quiescent current of 250 µA and offers a voltage regulation accuracy of ±2%. Packaged in a compact SOT-23-5 surface-mount format, it supports an industrial operating temperature range from -40 °C to +125 °C.

Feature Summary

• Integrated shutdown function controlled by TTL or CMOS logic levels for power management
• Internal protection mechanisms against overcurrent conditions and excessive thermal stress
• Noise bypass pin capability allowing external capacitor connection for reduced output noise

Applications

• Battery-powered portable electronic devices requiring efficient power regulation
• Industrial control systems operating within extended temperature environments
• Embedded circuits necessitating stable low-noise voltage supplies

Procurement Notes

Verify the specific suffix designation to confirm the exact output voltage and package configuration, as variations exist within the LK112S family. Ensure compatibility with standard SMD/SMT assembly processes given the SOT-23-5 footprint. Confirm RoHS compliance status and moisture sensitivity level requirements prior to integration into the manufacturing workflow.

Selection Notes

Select this component when a fixed 1.8 V rail is required with moderate current demands up to 200 mA. The wide input voltage tolerance accommodates varying supply sources, while the low quiescent current supports energy-efficient designs. Consider the thermal performance and dropout characteristics relative to the minimum input voltage available in the target application circuit.

Part Context

This part belongs to the LK112S series of low-dropout regulators featuring integrated shutdown capabilities. The series provides various fixed output voltages and utilizes a small outline transistor package suitable for space-constrained printed circuit board layouts. It serves as a power management solution for applications requiring reliable linear regulation with minimal external component count.

Replacement Considerations

LK112M18TR: Alternative reel-packaged version with identical electrical specifications and functionality.