This is a 5V DC/DC regulator, specifically a Murata OKI-78SR-5/1.5-W36H-C! They're highly efficient ~90%, and provide 5V @ 1.5A (7.5W) from a 7V to 36V input. 1.5A is ample for a Raspberry Pi Zero, but if using this with a Pi 3 or Pi 4 you'll need to keep a close eye on current consumption (and potentially take measures to reduce current usage). It's deal if you need to produce 5V from a higher voltage power source for your project, and unlike noisy UBECs, this regulator provides < 75 mV peak-to-peak ripple. We also stock similar 3.3V and 12V regulators. Features * 7 - 36V Input * 5V @ 1.5A Output (7.5W) * < 75 mV peak-to-peak ripple * Vertical mount, small footprint package * “No heat sink” direct replacement for 3-terminal 78xx-series linear regulators * High efficiency (~90%) with no external components * Short circuit protection * Outstanding thermal derating performance * UL/EN/IEC 60950-1, 2nd Edition safety approvals Resources Download the datasheet here https://elecena.pl/product/22716750/5v-dc-dc-regulator-discontinued 2023-03-07 https://elecena.pl/product/22716750/5v-dc-dc-regulator-discontinued 2024-09-19