New series of popular DC/DC converter family for embedded offers high efficiency

By Alix Paultre, contributing editor

Murata’s latest entry in its OKI-78SR series of non-isolated switching regulator DC/DC power converters for embedded applications is a 12-V fixed single-output device. The new member offers both tight regulation and high efficiency and is a drop-in replacement for TO-220 package 78xx series linear regulators.

Measuring 10.4 x 7.62 x 16.5 mm (0.41 x 0.3 x 0.65 in.), the 12-V/1-A (when powered from 24 V) converter’s efficiency is as high as 95%, shrinking or eliminating the need for a heatsink. Packaged as a three-terminal 78xx linear regulator, the converter accepts from 15 V to 36 V and comes in vertical- and horizontal-mount options.

The series suits applications such as computing, networking, telecommunications, industrial automation, aerospace, and rail or, for that matter, any application in which the ambient temperature is from –40°C to 85°C. Features include a factory-set Vout at 12 Vdc, short-circuit/over-current protection, UL/EJ/IEC 60950-1, second edition safety approvals, and RoHS compliance.