This is a 12V DC/DC regulator, specifically a Murata OKI-78SR-12/1.0-W36-C!
They're highly efficient ~95%, and provide 12V @ 1A (12W) from a 15V to 36V input.
It's ideal if you need to produce 12V from a higher voltage power source for your project, and unlike noisy UBECs, this regulator provides < 75 mV peak-to-peak ripple.
- 15 - 36V Input
- 12V @ 1A Output (12W)
- < 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 (~95%) with no external components
- Short circuit protection
- Outstanding thermal derating performance
- UL/EN/IEC 60950-1, 2nd Edition safety approvals