LD39150DT12-R

Overview

The LD39150DT12-R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 1.2 V with a maximum continuous output current of 1.5 A. The device operates within an input voltage range of 1.5 V to 6 V and features a typical dropout voltage of 40 mV at full load. It incorporates internal protection mechanisms including overcurrent limiting and thermal shutdown. The component is housed in a surface-mount TO-252-3 (DPAK) package and is rated for operation across an extended temperature range from -40 °C to +125 °C.

Feature Summary

• Ultra-low dropout voltage performance enabling efficient regulation near the input rail
• Integrated overcurrent and thermal protection safeguards against fault conditions
• High power supply rejection ratio for effective noise attenuation

Applications

• Portable battery-powered electronic devices requiring stable low-voltage rails
• Embedded systems utilizing microcontrollers or digital logic operating at 1.2 V
• Noise-sensitive analog circuits requiring clean power supply lines

Procurement Notes

Verify the specific suffix 'DT12' confirms the 1.2 V fixed output variant, as the LD39150 series includes multiple voltage options. Confirm the 'R' suffix indicates reel packaging if tape-and-reel handling is required. Ensure the TO-252-3 package footprint matches the target PCB design. Cross-reference the manufacturer's latest datasheet for any updates on RoHS compliance or recommended external capacitor values.

Selection Notes

Select this component when a stable 1.2 V supply is needed with up to 1.5 A load capability. The low dropout characteristic makes it suitable for applications where the input voltage is close to the desired output. Consider the thermal dissipation requirements in the DPAK package under high load conditions. Verify that the input voltage does not exceed the 6 V maximum rating during all operating scenarios.

Part Context

This part belongs to the LD39150 family of ultra-low dropout regulators designed for high-current applications. The family shares common features such as BiCMOS technology and robust protection circuits. Variants within the series differ primarily in their fixed output voltage settings, allowing designers to choose the precise rail voltage required for their specific digital or analog loads while maintaining identical package and protection characteristics.

Replacement Considerations

Direct substitutes include other LD39150 variants with different output voltages if the voltage requirement changes. Check for pin-compatible LDOs from other manufacturers offering similar 1.5 A current and low dropout specifications. Ensure replacement parts maintain the same TO-252-3 package and thermal performance.