The STMicroelectronics LDK120C33R is a fixed-output LDO voltage regulator delivering 3.3 V at up to 200 mA. It comes in a SOT-323-5 package, rated for -40°C to 125°C, making it a fit for industrial and automotive environments where a clean, regulated 3.3 V rail is needed for MCUs, sensors, or interface ICs. Key specs include a dropout voltage of 0.3 V at full load and a quiescent current of 60 µA — low enough for battery-backed or always-on rails.
The enable pin gates the output for sequenced power-up or sleep modes. Protection includes over-current and over-temperature shutdown. Input voltage max is 5.5 V.
Compared to the LD39020DTPU33R, the LDK120C33R trades a lower PSRR (55 dB vs 80 dB at 1 kHz) for a slightly smaller footprint and comparable dropout. The LD39020 also adds a soft-start feature. If your design needs better ripple rejection above 1 kHz or controlled inrush, the LD39020 is worth a look; for a straight 3.3 V fixed rail at 200 mA with minimal external parts, the LDK120C33R does the job.