LD1085D2T33R

Overview

The LD1085D2T33R is a fixed positive low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 3.3V with a maximum output current capability of 3A. The device supports a maximum input voltage of 30V and operates within a junction temperature range of -40°C to +125°C. It features a dropout voltage of up to 1.5V at full load and maintains an output tolerance of ±1% at 25°C. The regulator is housed in a surface-mount D2PAK (TO-263-3) package with two leads and a tab, designed for efficient power management in compact electronic systems.

Feature Summary

• Fixed 3.3V output voltage with high precision tolerance
• High current delivery capability up to 3A
• Integrated thermal overload and short-circuit protection
• Low quiescent current design for improved efficiency

Applications

• Power supply modules requiring stable 3.3V rails
• Battery-powered equipment needing efficient voltage regulation
• General-purpose embedded system power distribution

Procurement Notes

Verify the component authenticity against official STMicroelectronics documentation. Confirm the specific package variant matches the D2PAK (TO-263-3) specification. Ensure the part number suffix corresponds to the fixed 3.3V output configuration. Check for RoHS compliance status if required by your manufacturing standards. Validate supplier credentials to guarantee original source integrity.

Selection Notes

Select this regulator when a stable 3.3V rail is required with currents up to 3A. It is suitable for applications where input voltages do not exceed 30V. Consider its thermal performance in the D2PAK package for heat dissipation requirements. Compare its dropout characteristics against other LDOs if operating near minimum input voltage margins. Ensure compatibility with existing PCB footprint designs for TO-263 packages.

Part Context

This component belongs to the LD1085 series of low-dropout regulators from STMicroelectronics. The series includes adjustable and fixed voltage variants available in multiple packages such as TO-220, D²PAK, and DPAK. The LD1085 family is designed to replace older three-terminal adjustable regulators while offering superior dropout voltage performance and tighter output tolerance specifications across the operating temperature range.

Replacement Considerations

Direct pin-compatible replacements within the same series include LD1085D2M33R, which shares the D2PAK/A package and 3.3V fixed output. Verify that any substitute maintains the 3A current rating and 30V maximum input voltage limits. Ensure thermal resistance characteristics are comparable to maintain safe operating temperatures under similar load conditions.