LDS3985PU33RY

Overview

The LD3985PU33RY is a fixed-output low dropout linear voltage regulator manufactured by STMicroelectronics. It provides a stable 3.3 V output with a maximum current capacity of 300 mA. The device operates within an input voltage range of 2.5 V to 6 V and features a typical dropout voltage of 150 mV at full load, with a maximum of 250 mV. It maintains a quiescent current of approximately 150 µA and includes integrated protection against overcurrent and thermal overload. The component is housed in a compact 6-lead DFN package (3x3 mm) suitable for surface mount applications.

Feature Summary

• Fixed 3.3 V output voltage with high precision tolerance
• Integrated thermal and current limiting protection mechanisms
• Low quiescent current consumption for power efficiency
• Automotive-grade qualification compliant with AEC-Q100 standards

Applications

• Power supply stages for automotive electronic control units
• Battery-powered portable devices requiring efficient regulation
• Embedded systems utilizing microcontrollers or sensors
• Industrial equipment operating under harsh environmental conditions

Procurement Notes

Verify the specific suffix 'PU33RY' to confirm the fixed 3.3 V output, DFN-6 packaging, and reel tape configuration. Ensure compatibility with AEC-Q100 requirements if deploying in automotive contexts. Check moisture sensitivity levels and reflow soldering profiles prior to assembly. Confirm availability status as distribution data may indicate end-of-life or obsolescence for this specific variant.

Selection Notes

Select this regulator when a compact footprint and automotive reliability are required for 3.3 V rails. It is suitable for designs needing low noise and high line/load regulation within a 6 V input limit. Consider the 300 mA output capability against load demands. Evaluate thermal performance in enclosed spaces due to the small DFN package size. Compare against higher current alternatives if loads exceed specified limits.

Part Context

This component belongs to the LDS3985 series of low dropout regulators designed for robust performance in demanding environments. The series offers various fixed output voltages and packages to support diverse power management needs. STMicroelectronics utilizes advanced silicon processes to achieve low dropout characteristics and high stability. The DFN package provides excellent thermal dissipation relative to its small physical dimensions.

Replacement Considerations

LDK130M33RY is a confirmed substitute part number available from STMicroelectronics.