LDI1117-1.2D

Overview

The LDI1117-1.2D is a fixed-output Low Dropout (LDO) linear voltage regulator manufactured by Diotec Semiconductor, housed in an 8-pin SO package. It provides a nominal output voltage of 1.2V with a tolerance of ±1%, supporting a maximum output current of 1.35A. The device operates with a maximum input voltage of 20V and features a typical dropout voltage of 1V at full load. Key electrical characteristics include a line regulation of 6mV and load regulation of 10mV. It incorporates internal protection mechanisms against overcurrent and thermal overload, ensuring reliable operation within a junction temperature range of -40°C to +150°C.

Feature Summary

• Fixed 1.2V output voltage with high precision ±1% tolerance
• Integrated overcurrent and thermal shutdown protection circuits
• Low dropout performance for efficient power management
• Surface-mount SO-8 packaging for compact board integration

Applications

• Portable battery-powered electronic devices requiring stable low-voltage rails
• Embedded systems utilizing microcontrollers or logic circuits needing 1.2V supply
• Post-regulation stages for DC-DC converter outputs to reduce noise
• Industrial control modules operating under varying input conditions

Procurement Notes

Verify the specific suffix 'D' indicates the SO-8 package variant distinct from SOT-223 versions. Confirm RoHS compliance status and Moisture Sensitivity Level (MSL) ratings prior to assembly planning. Ensure ordering documentation explicitly references the Diotec Semiconductor manufacturer part number to avoid confusion with similar LDO families. Cross-reference datasheet revision dates for accurate thermal and electrical specifications.

Selection Notes

Select this component when a precise 1.2V fixed rail is required with moderate current capability up to 1.35A. The SO-8 package suits applications prioritizing surface-mount density over the higher thermal dissipation of TO-220 styles. Consider the 20V maximum input rating for systems with significant input-to-output voltage differentials. Evaluate thermal resistance requirements based on ambient temperature and PCB copper area availability for heat spreading.

Part Context

This regulator belongs to the LDI1117 series of low-dropout linear regulators designed for general-purpose power management. The series offers various fixed output voltages and package options, including SOT-223 and SO-8 configurations. The LDI1117-1.2D specifically addresses the need for compact, high-current regulation in space-constrained designs while maintaining stability and protection features common to modern PMIC solutions.

Replacement Considerations

Direct pin-compatible substitutes may include other 1.2V LDOs in SO-8 packages with comparable current ratings, such as variants from Texas Instruments or Analog Devices. Verify that replacement parts match the 1.35A output current and 20V input voltage limits. Ensure thermal performance characteristics align with the original design constraints.