LDI1117-1.8U

Overview

The Diotec Semiconductor LDI1117-1.8U is a low dropout linear voltage regulator (LDO) designed for positive fixed output applications. It provides a nominal output voltage of 1.8V with a maximum continuous output current capability of 1.35A. The device supports an input voltage range up to 20V and features a typical dropout voltage of 350mV at full load. It incorporates internal thermal overload protection, current limiting, and safe operating area protection. The component operates within a junction temperature range of -40°C to +125°C and is housed in a SOT-89 surface-mount package.

Feature Summary

• Provides stable fixed 1.8V output with high current capacity
• Includes comprehensive internal protection against overcurrent and overheating
• Designed for efficient regulation with low dropout voltage characteristics

Applications

• Battery-powered portable electronic devices requiring regulated power rails
• General-purpose power management in consumer electronics
• Secondary linear regulation stages following DC-DC converters

Procurement Notes

Verify the specific suffix 'U' corresponds to the SOT-89 package variant when sourcing, as other suffixes like 'H' indicate different packages such as SOT-223. Confirm RoHS compliance status and moisture sensitivity level requirements for your assembly process. Ensure the supplier provides official datasheets matching the exact part number to avoid confusion with similar family members that may have different pinouts or electrical limits.

Selection Notes

Select this component when a fixed 1.8V rail is required with up to 1.35A load current. It is suitable for applications where input voltages exceed the output by a small margin due to its low dropout特性. Consider the thermal performance in the SOT-89 package under your expected ambient conditions and load profile to ensure junction temperatures remain within safe limits during operation.

Part Context

This part belongs to the LDI1117 series of low dropout regulators from Diotec Semiconductor. The series offers various fixed output voltages and package options including SOT-223 and SOT-89. The LDI1117-1.8U specifically utilizes the SOT-89 form factor, distinguishing it from the SOT-223 packaged variants like the LDI1117-1.8H which share similar electrical performance but differ in physical dimensions and thermal dissipation capabilities.

Replacement Considerations

Direct substitutes include other LDI1117-1.8 variants with compatible packages, such as the LDI1117-1.8H if SOT-223 packaging is acceptable. Cross-brand equivalents should match the 1.8V output, 1.35A current rating, and SOT-89 footprint while verifying identical pinout configurations and protection feature sets.