LK112SM80TR

Overview

The LK112SM80TR is a low-dropout linear voltage regulator manufactured by STMicroelectronics, designed for applications requiring stable power delivery. It provides a fixed output voltage of 8.0 V with a maximum output current capability of 200 mA. The device operates within an input voltage range from 8.5 V to 14 V and maintains regulation across a wide temperature range from -40 °C to +125 °C. Key electrical specifications include a maximum dropout voltage of 500 mV at full load, a quiescent current of 250 μA in the ON state, and a voltage tolerance of ±2% at 25 °C. It is housed in a compact SOT-23-5 surface-mount package.

Feature Summary

• Integrated shutdown function controllable via TTL or CMOS logic levels
• Low noise performance with dedicated bypass pin for external capacitor connection
• Built-in internal current limiting and thermal protection mechanisms

Applications

• Battery-powered portable electronic devices
• Industrial control systems requiring regulated power rails
• Embedded sensor nodes and IoT modules

Procurement Notes

Verify the specific suffix 'TR' indicates tape-and-reel packaging configuration when sourcing. Confirm that the 8.0 V output variant matches the system design requirements, as the LK112S series offers multiple fixed voltage options. Ensure compatibility with the SOT-23-5 footprint during PCB layout. Cross-reference the manufacturer's latest datasheet for any updates on RoHS compliance status or recommended operating conditions before finalizing procurement orders.

Selection Notes

Select this component when a fixed 8.0 V rail is required with moderate current demands up to 200 mA. The low quiescent current makes it suitable for battery-operated equipment where standby power consumption is critical. The inclusion of a shutdown pin allows for system-level power management integration. Consider the thermal dissipation capabilities of the SOT-23-5 package relative to the expected ambient temperature and load current to ensure reliable operation within the specified industrial temperature range.

Part Context

This part belongs to the LK112S family of low-dropout regulators from STMicroelectronics. The family shares common features such as low noise, shutdown functionality, and robust protection circuits. Variants within the series differ primarily in their fixed output voltage settings, ranging from lower voltages up to higher levels, while maintaining consistent package dimensions and pin configurations for design flexibility across different power supply architectures.

Replacement Considerations

Direct substitutes within the same family include other LK112S variants with different fixed output voltages if the voltage requirement can be adjusted. Verify pin-to-pin compatibility with alternative LDO regulators from other manufacturers only if their electrical characteristics, particularly dropout voltage and quiescent current, match or exceed the original specifications.