LDI1117-1.8D

Overview

The LDI1117-1.8D is a fixed-output linear voltage regulator manufactured by Diotec Semiconductor, designed for positive voltage regulation applications. It provides a nominal output voltage of 1.8 V with a maximum output current capability of 1 A. The device utilizes an 8-pin SO (Small Outline) surface-mount package, suitable for space-constrained designs. Key electrical specifications include a maximum input voltage rating of 20 V and a typical dropout voltage of 1 V at full load. The component operates within a junction temperature range of -40°C to +125°C and features internal protection mechanisms against overcurrent and thermal overload conditions.

Feature Summary

• Fixed 1.8 V output voltage configuration
• High current capacity up to 1 A
• Integrated thermal and current limiting protection
• Surface-mount 8-pin SO packaging

Applications

• Battery-powered portable devices requiring stable low-voltage rails
• Embedded systems with microcontroller logic supply needs
• General-purpose power management in consumer electronics

Procurement Notes

Verify the specific suffix 'D' corresponds to the 8-pin SO package variant when sourcing, as Diotec offers other packages like SOT-223 for similar voltage ratings. Confirm RoHS compliance status through official datasheets or manufacturer declarations prior to integration. Ensure input voltage does not exceed the 20 V absolute maximum rating to prevent device damage. Check for moisture sensitivity level requirements during storage and handling procedures.

Selection Notes

Select this component when a fixed 1.8 V rail is required with up to 1 A load current in a compact surface-mount form factor. Compare against SOT-223 variants if higher thermal dissipation is needed, noting that package selection impacts thermal performance rather than electrical function. Verify that the 1 V dropout voltage aligns with the available headroom between input and output voltages in the target circuit design.

Part Context

This part belongs to the LDI1117 series of low-dropout linear regulators from Diotec Semiconductor. The series includes various fixed output voltages and package options, such as the H suffix for SOT-223 packages. The LDI1117-1.8D specifically denotes the 1.8 V output version in the 8-pin SO package, distinguishing it from adjustable versions or other voltage taps within the same family.

Replacement Considerations

Direct pin-compatible substitutes may include other manufacturers' 1.8 V, 1 A LDOs in SO-8 packages. Verify equivalent dropout voltage, quiescent current, and thermal characteristics. Cross-reference with Diotec's own LDI1117-1.8H (SOT-223) if package change is acceptable, but note the pinout and thermal pad differences.