LD1085DT33R

Overview

The LD1085DT33R is a fixed positive low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a stable 3.3V output with a maximum current capacity of 3A. The device supports input voltages up to 30V and operates within a temperature range of -40°C to +125°C. It features a typical dropout voltage of 1.2V at full load and maintains an output tolerance of ±1% at 25°C, expanding to ±2% across the full operating temperature range. The component utilizes a D2PAK surface-mount package with three pins.

Feature Summary

• Fixed 3.3V output voltage with high precision tolerance
• Capable of delivering up to 3A continuous output current
• Low dropout voltage ensures efficient power regulation under varying loads
• Internal thermal and current limiting protects against overload conditions

Applications

• Power management systems requiring stable 3.3V rails
• Battery-powered equipment utilizing low-dropout regulation
• General-purpose linear voltage regulation in electronic circuits

Procurement Notes

Verify the specific suffix 'D' indicates the D2PAK-3 package configuration and 'T33' denotes the fixed 3.3V output. Confirm that the 'R' suffix corresponds to tape-and-reel packaging if reel supply is required. Ensure compatibility with standard surface-mount assembly processes for the TO-263 form factor. Cross-reference the manufacturer's latest datasheet for any updates on pinout or electrical characteristics before finalizing procurement specifications.

Selection Notes

Select this component when a fixed 3.3V output is required with high current capability up to 3A. It is suitable for applications where input voltage exceeds 3.3V but remains below 30V. Consider the thermal performance of the D2PAK package for heat dissipation requirements. This regulator offers better dropout performance compared to older three-terminal adjustable regulators while maintaining pin compatibility.

Part Context

This part belongs to the LD1085 series of low-dropout positive voltage regulators from STMicroelectronics. The series includes both adjustable and fixed output variants designed for efficiency and reliability. The LD1085 family is engineered to replace traditional PNP-based regulators, offering improved efficiency by minimizing static current waste. It is widely used in general-purpose power supply designs requiring robust linear regulation.

Replacement Considerations

The LD1085D2T33R is functionally equivalent to the LD1085DT33TR variant within the same product line. Both parts share identical electrical specifications and output voltage. Verify package consistency between D2PAK and similar surface-mount formats during substitution.