LD39015M33R

Product Overview

The LD39015M33R from STMicroelectronics is a single-output, fixed-voltage linear regulator for positive supply rails. It provides a 3.3 V regulated output at up to 150 mA from an input voltage up to 5.5 V, with a maximum dropout of 0.1 V at 100 mA. The device uses a SOT-23-5 surface-mount package and includes an enable control feature, over-current protection, and over-temperature protection. Quiescent current is 50 µA, with a maximum supply current of 70 µA, and PSRR is 65 dB at 1 kHz and 62 dB at 10 kHz. The operating temperature range is -40°C to 125°C.

Key Features

• Single positive fixed 3.3 V output
• Output current of 150 mA
• Maximum input voltage of 5.5 V
• Maximum dropout of 0.1 V at 100 mA
• Enable control feature
• Over-current and over-temperature protection
• Quiescent current of 50 µA and maximum supply current of 70 µA
• PSRR of 65 dB at 1 kHz and 62 dB at 10 kHz
• Operating temperature range of -40°C to 125°C
• SOT-23-5 surface-mount package

Applications

• Fixed 3.3 V supply for low-current digital logic, sensors, or interface circuits
• Regulation from an input rail up to 5.5 V where a small dropout voltage is required
• Enable-controlled power sequencing or selective powering of a 3.3 V subsystem
• Surface-mount regulator placement in space-constrained boards using SOT-23-5

Design & Procurement Notes

When selecting this regulator, verify that the input voltage does not exceed 5.5 V and that the required output current remains at or below 150 mA. The 0.1 V maximum dropout at 100 mA should be evaluated against the minimum input-to-output voltage difference available in the system. The enable control can support system-level power management, while over-current and over-temperature protection should be considered with the load and thermal path. The 50 µA quiescent current and 70 µA maximum supply current may be relevant for low-current standby or always-on rails. PSRR values are 65 dB at 1 kHz and 62 dB at 10 kHz, so noise-sensitive applications should compare those frequencies with the actual ripple or interference spectrum. The SOT-23-5 surface-mount package and -40°C to 125°C operating range should be checked against board layout and environmental requirements.