This is a 3.3V DC/DC regulator, specifically a Murata OKI-78SR-3.3/1.5-W36-C. They're highly efficient (~85%) and provide 3.3V @ 1.5A (4.95W) from a 7V to 36V input. It's ideal if you need to produce 3.3V from a higher voltage power source for your project. We also stock similar 5V and 12V regulators. Features * 7 - 36V Input * 3.3V @ 1.5A Output (4.95W) * < 40 mV peak-to-peak ripple * Vertical mount, small footprint package * “No heat sink” direct replacement for 3-terminal 78xx-series linear regulators * High efficiency (~85%) with no external components * Short circuit protection * Outstanding thermal derating performance * UL/EN/IEC 60950-1, 2nd Edition safety approvals Datasheet * Download the datasheet here https://elecena.pl/product/22718948/3-3v-dc-dc-regulator-discontinued 2023-03-07 https://elecena.pl/product/22718948/3-3v-dc-dc-regulator-discontinued 2024-09-19