OKI-78SR-E Series
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OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC Typical units PRODUCT OVERVIEW 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, in an Encapsulated package “No heat sink” direct replacement for 3-terminal 78xx-series linear regulators High efficiency with no external components Short circuit protection Encapsulated in a 0.47 x 0.69 inch (11.9 x 17.6 mm) vertical or horizontal package, the OKI78SR-E 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. Outstanding thermal derating performance UL/EN/IEC 60950-1, 2nd Edition safety approvals Three nominal output voltages are offered (3.3, 5 and 12 VDC), up to 1.5 Amp 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 3.3 and 5Vout models have an ultra wide input range of 7 to 36 Volts DC and the 12Vout model has an input voltage range of 15 to 36V. Protection features include short circuit current limit protection. The OKI-78SR-E is designed to meet all standards approvals. RoHS-6 (no lead) hazardous material compliance is specified as standard. Connection Diagram +Vin • Filters • Current Sense External DC Power Source Reference and Error Amplifier Figure 1. OKI-78SR-E Note: Murata Power Solutions strongly recommends an external input fuse, F1. See specifications. (Pending) For full details go to www.murata-ps.com/rohs

Murata Power Solutions OKI-78SR-E SeriesEncapsulated Non-Isolated Switching Regulator {functional specifications summary and ordering guide NOTE: All specifications are at nominal line voltage, Vout = nominal and full load, +25°C.with no external capacitor, unless otherwise noted. NOTE: Please click here to view the data sheet for the OKI-78SR “Open-frame” series.

Murata Power Solutions OKI-78SR-E SeriesEncapsulated Non-Isolated Switching Regulator FUNCTIONAL SPECIFICATIONS - OKI-78SR-3.3/1.5-W36E-C ABSOLUTE MAXIMUM RATINGS

Murata Power Solutions OKI-78SR-E SeriesEncapsulated Non-Isolated Switching Regulator FUNCTIONAL SPECIFICATIONS - OKI-78SR-3.3/1.5-W36E-C (CONT.) OUTPUT Specification Notes: 1) All specifications are typical unless noted. General conditions for Specifications are +25 deg.C ambient temperature, Vin=nominal, Vout=nominal, full rated load. Adequate airflow must be supplied for extended testing under power. See Derating curves.. 2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 x 100 pF, Cbus=1000 pF, Lbus=1 pH. All caps are low ESR...

Murata Power Solutions OKI-78SR-E SeriesEncapsulated Non-Isolated Switching Regulator PERFORMANCE DATA - OKI-78SR-3.3/1.5-W36E-C Output Ripple and Noise (Vin=7V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25°C.; ScopeBW=100MHz) Output Ripple and Noise (Vin=12V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25°C., ScopeBW=100MHz) Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25°C., ScopeBW=100MHz)

Murata Power Solutions OKI-78SR-E SeriesEncapsulated Non-Isolated Switching Regulator PERFORMANCE DATA - OKI-78SR-3.3/1.5-W36E-C Step Load Transient Response (Vin=7V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Slew=1A/pS, Ta=+25°C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div

Murata Power Solutions OKI-78SR-E SeriesEncapsulated Non-Isolated Switching Regulator FUNCTIONAL SPECIFICATIONS - OKI-78SR-5/1.5-W36E-C ABSOLUTE MAXIMUM RATINGS

Murata Power Solutions OKI-78SR-E SeriesEncapsulated Non-Isolated Switching Regulator FUNCTIONAL SPECIFICATIONS - OKI-78SR-5/1.5-W36E-C (CONT.) OUTPUT Specification Notes: 1) All specifications are typical unless noted. General conditions for Specifications are +25 deg.C ambient temperature, Vin=nominal, Vout=nominal, full rated load. Adequate airflow must be supplied for extended testing under power. See Derating curves.. 2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 x 100 pF, Cbus=1000 pF, Lbus=1 pH. All caps are low ESR...

OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-5/1.5-W36E-C Efficiency vs. Line Voltage and Load Current @ +25˚C. (Vout = Vnom.) Maximum Current Temperature Derating at sea level (Vin=7V to 36V) 2.00 Output Current (Amps) Load Current (Amps) Output Ripple and Noise (Vin=7V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) Output Ripple and Noise (Vin=12V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz)

Murata Power Solutions OKI-78SR-E SeriesEncapsulated Non-Isolated Switching Regulator PERFORMANCE DATA - OKI-78SR-5/1.5-W36E-C Step Load Transient Response (Vin=7V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Slew=1A/pS, Ta=+25°C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div.

Murata Power Solutions OKI-78SR-E SeriesEncapsulated Non-Isolated Switching Regulator FUNCTIONAL SPECIFICATIONS - OKI-78SR-12/1.0-W36E-C ABSOLUTE MAXIMUM RATINGS

Murata Power Solutions OKI-78SR-E SeriesEncapsulated Non-Isolated Switching Regulator FUNCTIONAL SPECIFICATIONS - OKI-78SR-12/1.0-W36E-C (CONT.) OUTPUT Specification Notes: 1) All specifications are typical unless noted. General conditions for Specifications are +25 deg.C ambient temperature, Vin=nominal, Vout=nominal, full rated load. Adequate airflow must be supplied for extended testing under power. See Derating curves.. 2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 x 100 pF, Cbus=1000 pF, Lbus=1 pH. All caps are low ESR...