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.

We also stock similar 5V and 3.3V regulators.

Features

• 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

Resources

Download the datasheet here