LB1117AADB500

Overview

The LB1117AADB500 is a fixed-output low-dropout linear regulator manufactured by Diodes Incorporated. It provides a stable 5.0 V output with a maximum load current of 1.0 A. The device utilizes a bipolar technology architecture and is housed in an SOT-223-3 surface-mount package, which corresponds to the TO-261-4 physical form factor. It operates within a junction temperature range of -40°C to +125°C. Key electrical characteristics include a typical dropout voltage of 1.3 V at full load and a maximum input voltage rating of 18 V. The unit features positive polarity output and includes internal protection mechanisms such as thermal shutdown and current limiting.

Feature Summary

• Provides a fixed 5.0 V regulated output suitable for standard logic supply rails
• Supports up to 1.0 A continuous load current capability
• Integrates thermal shutdown and current limiting for operational safety
• Designed for surface-mount assembly using the SOT-223-3 package

Applications

• General-purpose power supply regulation in electronic circuits
• Biasing applications requiring a stable 5 V reference
• Pre-regulation stages for downstream switching regulators

Procurement Notes

Verify the specific manufacturer part number against official Diodes Incorporated documentation to confirm pinout compatibility and package dimensions. Ensure that the sourcing channel provides valid traceability and authenticity guarantees. Cross-reference the datasheet revision history to confirm that the component meets current RoHS compliance standards and environmental regulations required for your manufacturing process.

Selection Notes

Select this component when a fixed 5 V output is required with moderate current demands up to 1 A. The SOT-223-3 package offers a balance between thermal performance and board space efficiency compared to larger through-hole options. Consider the 1.3 V dropout characteristic to ensure sufficient input-to-output voltage differential under all operating conditions. Verify that the application environment remains within the specified -40°C to +125°C junction temperature range.

Part Context

This component belongs to the LB1117 series of low-dropout regulators from Diodes Incorporated. The series typically includes variants with different fixed output voltages and adjustable versions. The LB1117AADB500 specifically denotes the 5.0 V fixed output variant in the SOT-223-3 package. This family is designed for applications requiring efficient linear regulation with built-in protection features, serving as a cost-effective solution for power management in consumer and industrial electronics.

Replacement Considerations

Compatible substitutes may include other 5.0 V, 1 A LDOs in SOT-223 packages from various manufacturers, provided pinouts are compatible. Direct replacements within the same family should be verified via official cross-reference lists.