LD1117AV33

Overview

The LD1117AV33 is a low dropout positive voltage regulator manufactured by STMicroelectronics, designed to provide a fixed 3.3 V output with a maximum continuous current of 1 A. It operates within an extended industrial temperature range from 0 °C to +125 °C and features a typical quiescent current of 5 mA. The device incorporates internal thermal overload protection and current limiting to ensure reliability under fault conditions. It requires only a 10 μF output capacitor for stability and offers high supply voltage rejection. Available in surface-mount packages such as SOT-223 and DPAK, it serves as a robust solution for battery-powered systems requiring efficient linear regulation.

Feature Summary

• Fixed 3.3 V output capability delivering up to 1 A load current
• Integrated thermal shutdown and current limit protection mechanisms
• Low quiescent current consumption for enhanced power efficiency
• Stable operation with minimal external components using standard capacitors

Applications

• Battery-powered portable electronic devices
• Embedded control circuits in industrial automation
• Post-regulation stages for switching power supplies
• General-purpose linear voltage regulation in consumer electronics

Procurement Notes

Verify the specific package variant (SOT-223 or DPAK) required for your PCB layout, as the base part number may not specify the footprint. Confirm RoHS compliance status and check for any recent lifecycle notifications regarding obsolescence or last-time buys. Ensure the supplier provides original manufacturer documentation to validate authenticity before integration into production designs.

Selection Notes

Select this component when a stable 3.3 V rail is needed with moderate current demands up to 1 A. It is suitable for applications where noise sensitivity is low but efficiency is critical due to limited input-output voltage differentials. Consider the thermal dissipation capabilities of the chosen package relative to the ambient operating environment and expected load profile to prevent overheating.

Part Context

This device belongs to the LD1117 family of low dropout regulators, which are widely used for their simplicity and cost-effectiveness. The 'A' suffix typically denotes an industrial temperature grade, expanding operational utility beyond commercial limits. It complements other PMIC solutions by providing a dedicated, high-current linear regulation path for sensitive analog or digital subsystems.

Replacement Considerations

Direct substitutes include the LD1117AS33TR for surface-mount implementations and the LD1117V33 for through-hole requirements. Verify pinout compatibility and thermal performance characteristics when transitioning between package types or adjusting manufacturers within the same regulatory class.