LDK120DM33R

Overview

The LDK120DM33R is a fixed-output linear voltage regulator manufactured by STMicroelectronics. It provides a stable 3.3V output with a maximum current capacity of 200mA. The device operates within an input voltage range of 1.9V to 5.5V and features a typical dropout voltage of 100mV at 100mA load. Key electrical specifications include a maximum quiescent current of 100µA, which reduces to less than 1µA in shutdown mode. The unit offers high power supply rejection ratio (PSRR) of 55dB across the 120Hz to 10kHz frequency band. It is housed in a compact SOT-23-5 surface-mount package and supports operation across an extended temperature range from -40°C to +125°C.

Feature Summary

• Logic-controlled electronic shutdown function enables ultra-low power consumption below 1 µA when disabled.
• Integrated protection mechanisms include constant current limiting for short-circuit conditions and thermal overload protection.
• Designed for stability with ceramic output capacitors, ensuring reliable performance in low-noise applications.

Applications

• Low-power battery-operated portable devices
• Noise-sensitive analog circuits requiring clean power rails
• Embedded systems utilizing microcontrollers or sensors

Procurement Notes

Verify the specific suffix DM33R against the manufacturer's official datasheet to confirm the exact output voltage tolerance and package variant. Ensure compatibility with the required PCB footprint for the SOT-23-5 package. Confirm that the intended application environment falls within the specified operating temperature range of -40°C to +125°C before finalizing procurement.

Selection Notes

Select this component when a fixed 3.3V rail is required with minimal static current draw. The SOT-23-5 package suits space-constrained designs. Consider the 200mA current limit for load requirements. The low noise characteristic makes it suitable for RF or precision analog sections where PSRR is critical. Verify input voltage does not exceed the 5.5V maximum rating under all operating conditions.

Part Context

This part belongs to the LDK120 series of low-dropout regulators from STMicroelectronics. The series is characterized by low quiescent current and very low noise, targeting efficiency in battery-powered systems. The 'DM' suffix typically denotes the specific SOT-23-5 packaging configuration within this product family.

Replacement Considerations

LDK120M33R is listed as a substitute option by distributors. Verify pinout and electrical parameters match exactly before substitution.