LD1085D2T12R

Overview

The LD1085D2T12R is a positive linear voltage regulator from the STMicroelectronics LD1085 series, designed for surface-mount applications. It provides a fixed 12V output with a maximum continuous current of 3A and supports input voltages up to 30V. The device utilizes a D2PAK-3 package (TO-263) and operates within a temperature range of -40°C to +125°C. Key electrical characteristics include a dropout voltage of 1.5V at full load and a quiescent current of 10mA.

Feature Summary

• Delivers high output current capability up to 3A with guaranteed low dropout performance under maximum load conditions.
• Incorporates internal thermal overload protection and current limiting mechanisms to safeguard against operational faults.
• Features a quiescent current path that directs bias current into the load rather than ground, enhancing overall circuit efficiency.

Applications

• General-purpose power supply regulation in industrial equipment
• Biasing stages in portable battery-powered electronic devices
• Pre-regulation for switching power converter inputs

Procurement Notes

Verify the specific suffix '12' confirms the fixed 12V output variant, as the LD1085 family includes adjustable and other fixed voltage options. Confirm the 'D2T' designation aligns with the required D2PAK-3 surface mount package type. Ensure compliance with RoHS3 standards if environmental regulations apply to your manufacturing process. Cross-reference the manufacturer part number directly with official STMicroelectronics documentation to avoid counterfeit components.

Selection Notes

Select this component when a stable 12V rail is required with currents approaching 3A. Consider the thermal dissipation requirements inherent to linear regulators operating with significant input-output voltage differentials. Verify that the application environment remains within the specified -40°C to +125°C operating temperature range. Evaluate the need for external capacitors, noting that stability requires a minimum capacitance value on the output.

Part Context

This component belongs to the LD1085 family of low-dropout positive voltage regulators manufactured by STMicroelectronics. The family is characterized by its ability to handle high currents while maintaining regulation with minimal voltage headroom. These regulators are widely used in systems requiring robust, simple linear regulation solutions where noise sensitivity is moderate and efficiency is secondary to cost and simplicity.

Replacement Considerations

Compatible substitutes include the LD1085D2T12TR and LD1085D2T12. Verify pinout compatibility and thermal pad configuration before substitution.