LM1117F-1.2

Overview

The LM1117F-1.2 is a fixed-output low-dropout linear regulator providing a nominal 1.2V output with a maximum continuous current of 1A. It operates within an input voltage range up to 12V and features a typical dropout voltage of 1.2V at full load. The device includes internal current limiting and thermal shutdown protection, ensuring reliability under overload conditions. Designed for surface-mount applications, it utilizes the SOT-89-3L package configuration.

Feature Summary

• Fixed 1.2V output voltage eliminates external resistor networks
• Integrated thermal shutdown and current limit protection
• Low quiescent current suitable for battery-powered systems

Applications

• Active SCSI terminators
• Portable computer power supplies
• SMPS post regulators
• Battery chargers

Procurement Notes

Verify the manufacturer source against the provided datasheet HTCKorea/HTC specifications. Confirm the SOT-89 package marking matches '1117C 1.2'. Ensure the component status is listed as Active in the ordering information table before finalizing procurement orders.

Selection Notes

Select this part when a stable 1.2V rail is required for logic or peripheral circuits. The SOT-89 package offers a compact footprint compared to TO-252 but requires careful thermal management due to higher junction-to-ambient resistance limits. Verify input voltage does not exceed 12V to maintain regulation.

Part Context

This component belongs to the LM1117 family of positive voltage regulators. The 'F' suffix indicates the SOT-89 surface-mount package variant, while '1.2' specifies the fixed output voltage. It serves as a direct replacement for adjustable versions where a specific low voltage rail is needed without external feedback components.

Replacement Considerations

LM1117S-1.2 (SOT-223 package) and LM1117RS-1.2 (TO-252 package) offer identical electrical performance with different mechanical footprints.