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OKI-78SR Series DC-DC Converter


Additions to Murata Power Solutions’ Okami™ PoL converter range feature ultra-wide input in compact package


Murata Power Solutions' OKI-78SR Series DC-DC Converter Murata Power Solutions has expanded its range of Okami™ non-isolated point-of-load (PoL) DC-DC converters with the introduction of the OKI-78SR series of switching regulator converters for industrial applications. A direct drop-in replacement for industry standard three-terminal 7803 and 7805 series LDOs, the series offers ultra-wide input voltage range (7 to 36 VDC) for nominal 24 V in with either 3.3 or 5 V output voltage, depending on the model. The OKI-78SR series offer efficiency levels up to 90.5%; a significant advantage over traditional LDO solutions.

Fabricated on a 0.41 by 0.65 inch (10.4 by 16.5 mm) Single Inline Package (SIP) module, the OKI-78SR series are non-isolated switching regulator (SR) DC/DC power converters for embedded applications. The fixed single output converters offer both tight regulation and high efficiency directly at the power usage site and are a direct plug-in replacement for TO-220 package 78xx series linear regulators. Typically, no extra outside components are required.

Two nominal output voltages are offered (3.3 and 5 VDC), each with 1.5 A maximum output. Based on fixed-frequency buck switching topology, the high efficiency means very low heat and little electrical noise, requiring no external components. The ultra-wide input range is 7 to 36 VDC. Protection features include input undervoltage and short circuit protection, overcurrent and over temperature shut down. The OKI-78SR is designed to meet all standards approvals. RoHS-6 (no lead) hazardous material compliance is specified as standard. Datasheet

Features
  • Vertical or horizontal SIP-mount, small footprint package
  • “No heat sink” direct replacement for 3-terminal 78xx-series linear regulators
  • Outstanding thermal derating performance
  • Ultra wide 7 to 36 VDC input range
  • High efficiency with no external components
  • Fixed Outputs of 3.3 or 5 VDC up to 1.5 A
  • Short circuit protection
  • UL/EN/IEC 60950-1, 2nd Edition safety approvals (pending)

Digi-Key P/N Manufacturer P/N Description
811-2195-5-ND OKI-78SR-3.3/1.5-W36-C CONV DC/DC 4.95W 36VIN 3.3VOUT
811-2196-5-ND OKI-78SR-5/1.5-W36-C CONV DC/DC 7.5W 36VIN 5VOUT