Murata Power Solutions OKI-78SR Series

OKI-78SR series embedded DC-DC converters

Murata has added a 12V model to its OKI-78SR series of non-isolated switching regulator DC/DC power converters for embedded applications. The fixed single output converter offers both tight regulation and high efficiency directly at the power usage site, and is a direct plug-in replacement for TO-220 package 78xx series linear regulators.

Rated at 12V/1A, when powered from a 24V source, the OKI-78SR-12/1.0-W36-C converter’s efficiency is a very high 95%, eliminating the need for a heatsink that adds cost and increases complexity in the design and manufacturing processes. Cleverly packaged in the form of a three-terminal 78xx linear regulator, the converter operates from a source voltage of 15 to 36V and is available in both vertical and horizontal mounting options. The package size is just 10.4 x 7.62 x 16.5mm (0.41 x 0.3 x 0.65 inches).

Murata expands popular DC-DC converter range for embedded applications.

Murata’s OKI-78SR series is suitable in a wide range of applications, including computing, networking, telecommunications, industrial, aerospace and rail. Indeed, it is ideal for any application where the ambient temperature ranges from -40 to 85°C, which has a source/system voltage in the range of 15 to 36Vdc, and where the output requirement is for 12V at 1A.  Standard features include a factory-set Vout at 12Vdc, short-circuit/over-current protection, UL/EJ/IEC 60950-1, second edition safety approvals and RoHS compliance.  

The OKI-78SR series incorporates advanced assembly techniques and the latest fixed switching frequency technology for power conversion available today. The optional packaging configurations, safety features, high reliability, state-of-the-art figures for efficiency, thermal management, dynamic load response, industry standard package and OCP protection features offer an unmatched level of performance.


Features Applications
  • 7-36Vin (3.3 & 5Vout), 15-36Vin (12Vout)
  • Fixed Output: 3.3 or 5V @ 1.5A or 12V @ 1.0A
  • Vertical SIP or horizontal mount, small footprint package
  • “No heat sink” direct replacement for 3-terminal 78xx-series linear regulators
  • High efficiency with no external components
  • Short circuit protection
  • Outstanding thermal derating performance
  • UL/EN/IEC 60950-1, 2nd Edition safety approvals and RoHS compliance
  • Suitable for applications that require 12V@1A with a system source in the range of 15-36Vdc
  • Protects itself and the application electronics in the event of a sort circuit
  • Provides a highly efficient alternative to a linear regulator; eliminates the requirement for a heat sink, and uses less board space
  • Computing
  • Networking
  • Telecommunications
  • Industrial
  • Aerospace
  • Rail
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