OKI-78SR Series Non-Isolated Switching Regulator DC-DC New! 12V Model Typical units FEATURES PRODUCT OVERVIEW (cid:1)7-36Vin (3.3 & 5Vout), 15-36Vin (12Vout) Fabricated on a 0.41 x 0.65 inch (10.4 x 16.5 Three nominal output voltages are offered (3.3, (cid:1)Fixed Output: 3.3 or 5V @ 1.5A or 12V @ 1.0A mm)Single Inline Package (SIP) module, the OKI- 5 and 12 VDC), up to 1.5 Amp maximum output. 78SR series are non-isolated switching regulator Based on fixed-frequency buck switching (cid:1)Vertical SIP or horizontal mount, small footprint (SR) DC-DC power converters for embedded ap- topology, the high efficiency means very low heat package plications. The fixed single output converters offer and little electrical noise, requiring no external (cid:1)“No heat sink” direct replacement for 3-terminal both tight regulation and high efficiency directly at components. The 3.3 and 5Vout models have an 78xx-series linear regulators the power usage site and are a direct plug-in ultra wide input range of 7 to 36 Volts DC and the (cid:1)High efficiency with no external components replacement for TO-220 package 78xx series 12Vout model has an input voltage range of 15 to linear regulators. Typically, no extra outside 36V. (cid:1)Short circuit protection components are required. Protection features include short circuit current (cid:1)Outstanding thermal derating performance limit protection. The OKI-78SR is designed to (cid:1)UL/EN/IEC 60950-1, 2nd Edition safety approvals meet all standards approvals. RoHS-6 (no lead) hazardous material compliance is specified as standard. Connection Diagram +Vin +Vout F1 • Switching • Filters Controller • Current Sense External DC Power Reference and Source Error Amplifier Common Common Figure 1. OKI-78SR Note: Murata Power Solutions strongly recommends an external input fuse, F1. See specifications. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 1 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS SUMMARY AND ORDERING GUIDE Output Input IOUT R/N (mVp-p) Regulation (Typ.) IIN, IIN, Efficiency VOUT (Amps Power VIN Nom. Range no load full load Package Root Model (Volts) max) (Watts) Max. Line Load (Volts) (Volts) (mA) (Amps) Min. Typ. Inches (mm) 0.41 x 0.34 x 0.65 OKI-78SR-3.3/1.5-W36-C 3.3 1.5 4.95 40 ±0.25% ±0.40% 12 7-36 5 0.48 84% 85.5% (10.4 x 8.64 x 16.5) 0.41 x 0.34 x 0.65 OKI-78SR-5/1.5-W36-C 5 1.5 7.5 75 ±0.25% ±0.40% 12 7-36 5 0.69 89% 90.5% (10.4 x 8.64 x 16.5) NEW 0.41 x 0.34 x 0.65 OKI-78SR-12/1.0-W36-C 12 1.0 12 75 ±0.25% ±0.25% 24 15-36 5 0.53 93.5% 95.3% (10.4 x 8.64 x 16.5) NOTE: All specifications are at nominal line voltage, Vout = nominal and full load, +25˚C.with no external capacitor, unless otherwise noted. PART NUMBER STRUCTURE OKI - 78SR - 3.3 / 1.5 - W36 H - C RoHS-6 Hazardous Substance Compliance Okami Non-Isolated PoL 78SR Series Blank: Vertical Mount H Suffix: Horizontal Mount Note: Maximum Rated Output in Volts Some model number combinations may not be available. Input Voltage Range Contact Murata Power Solutions. 7-36V (3.3 & 5Vo) Maximum Rated Output 15-36V (12Vo) Current in Amps Product Label Because of the small size of these products, the product label contains a Model Number Product character-reduced code to indicate the model number and manufacturing date Code OKI-78SR-3.3/1.5-W36-C I33115 code. Not all items on the label are always used. Please note that the label dif- fers from the product photograph on page 1. Here is the layout of the label: OKI-78SR-5/1.5-W36-C I50115 The label contains three rows of information: OKI-78SR-12/1.0-W36-C I12110 OKI-78SR-3.3/1.5-W36H-C I33115H OKI-78SR-5/1.5-W36H-C I50115H XXXXXX Product code OKI-78SR-12/1.0-W36H-C I12110H Mfg. date YMDX Rev. Revision level code The manufacturing date code is four characters: First character – Last digit of manufacturing year, example 2009 Second character – Month code (1 through 9 = Jan-Sep; Figure 2. Label Artwork Layout O, N, D = Oct, Nov, Dec) Third character – Day code (1 through 9 = 1 to 9, 10 = 0 and First row – Murata Power Solutions logo 11 through 31 = A through Z) Second row – Model number product code (see table) Fourth character – Manufacturing information Third row – Manufacturing date code and revision level www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 2 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-3.3/1.5-W36-C ABSOLUTE MAXIMUM RATINGS Conditions ① Minimum Typical/Nominal Maximum Units Input Voltage, Continuous Full power operation 0 36 Vdc Input Reverse Polarity None, install external fuse None Vdc Output Power 0 5.15 W Output Current Current-limited, no damage, short-circuit protected 0 1.5 A Storage Temperature Range Vin = Zero (no power) -55 125 °C Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifications Table is not implied or recommended. INPUT Operating voltage range 7 12 36 Vdc Recommended External Fuse Fast blow 2 A Reverse Polarity Protection ⑨ None, install external fuse None Vdc Internal Filter Type C-TYPE Input current Full Load Conditions Vin = nominal 0.48 0.51 A Low Line Vin @ min 0.80 0.85 A Inrush Transient 0.16 A2-Sec. Short Circuit Input Current 5 mA No Load Input Current Vin = nominal 5 10 mA Shut-Down Mode Input Current 1 mA Reflected (back) ripple current ② (Cin = 2 X 100uF, CBus = 1000uF, LBus = 1uH) 50 mA, pk-pk GENERAL and SAFETY @ Vin nom, 3.3Vout 83.7 85.5 % Efficiency @ Vin min, 3.3Vout 87.0 88.4 % Certified to UL-60950-1, IEC/EN60950-1, Safety Yes 2nd Edition Per Telcordia SR332, issue 1, class 3, ground Calculated MTBF ④ fixed, Tambient=+25°C 78.7 Hours x 106 DYNAMIC CHARACTERISTICS Fixed Switching Frequency 500 kHz 50-100-50% load step, settling time to within Dynamic Load Response 25 50 μSec ±2% of Vout di/dt =1A/μSec Dynamic Load Peak Deviation same as above 100 150 mV www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 3 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-3.3/1.5-W36-C (CONT.) OUTPUT Conditions Minimum Typical/Nominal Maximum Units Total Output Power 0 4.95 5.15 W Voltage Nominal Output Voltage Range 3.168 3.3 3.432 Vdc Setting Accuracy At 50% load -4 4 % of Vnom. Output Voltage Overshoot - Startup: 3 %Vo nom Current Output Current Range 0 1.5 1.5 A Minimum Load ⑪ No minimum load Current Limit Inception 98% of Vnom., after warmup @3.3Vout 2.50 3.50 5.00 A Short Circuit Mode ⑥⑪ Hiccup technique, autorecovery within Short Circuit Current 0.01 A ±1% of Vout Short Circuit Duration Output shorted to ground, no damage Continuous (remove short for recovery) Short circuit protection method ⑧ Current limiting Regulation ⑩ Total Regulation Band Over all line, load and temp conditions -3 Vo set 3 % Vo set Line Regulation Vin=min. to max. Vout=nom. ±0.25 % Load Regulation Iout=min. to max. ±0.40 % Ripple and Noise (20MHz BW) ⑪ 3.3Vo, 12Vin 30 40 mV pk-pk Temperature Coefficient At all outputs ±0.02 % of Vnom./°C Maximum Capacitive Loading low ESR; >0.001, <0.01 ohm 300 μF Maximum Capacitive Loading 0.01 ohm 3300 μF MECHANICAL Outline Dimensions 0.41 x 0.65 x 0.34 Inches 10.4 x 16.5 x 8.64 mm Weight 0.07 Ounces 2 Grams Pin Material copper alloy Pin Finish Matte Tin 100-300 μ" Nickel 75-150 μ" ENVIRONMENTAL Operating Ambient Temperature Range ③ see derating curves -40 85 °C Storage Temperature Vin = Zero (no power) -55 125 °C RoHS Compliant RoHS-6 Specification Notes: 1) All specifications are typical unless noted. General conditions for Specifications are +25 deg.C ambient 7) The output is not intended to sink appreciable reverse current. temperature, Vin=nominal, Vout=nominal, full rated load. Adequate airflow must be supplied for extended 8) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current testing under power. See Derating curves.. output. If the overcurrent condition still exists, the restart current will be removed and then tried again. 2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 This short current pulse prevents overheating and damaging the converter. x 100 μF, Cbus=1000 μF, Lbus=1 μH. All caps are low ESR types. 9) Input Fusing: If reverse polarity is accidentally applied to the input, to ensure reverse input protection, 3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher always connect an external input fast-blow fuse in series with the +Vin input. Use approximately twice the temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total full input current rating with nominal input voltage. RMS current over time does not exceed the Derating curve. All Derating curves are presented near sea 10) Regulation specifications describe the deviation as the line input voltage or output load current is varied level altitude. Be aware of reduced power dissipation with increasing altitude. from a nominal midpoint value to either extreme. 4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground 11) Output noise may be further reduced by installing an external filter. Do not exceed the maximum output fixed conditions, Tpcboard=+25 ˚C, full output load, natural air convection. capacitance. At zero output current and no external capacitor, the output may contain low frequency 5) The input and output are not isolated. They share a single COMMON power and signal return. components which exceed the ripple specification. The output may be operated indefinitely with no load. 6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. Output current limit and short circuit protection are non-latching. When the overcurrent fault is removed, the converter will immediately recover. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 4 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-3.3/1.5-W36-C Efficiency vs. Line Voltage and Load Current @ +25˚C. (Vout = Vnom.) Maximum Current Temperature Derating at sea level (Vin=7V to 36V) 100 2.00 90 80 70 VIN = 7V Efficiency (%) 654000 VVIINN == 1326VV put Current (Amps) 1.00 0.33 m/s (65 LFM) 30 ut O 20 10 0 0.00 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 20 25 30 35 40 45 50 55 60 65 70 75 80 85 Load Current (Amps) Ambient Temperature (ºC) Output Ripple and Noise (Vin=7V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., Output Ripple and Noise (Vin=12V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) ScopeBW=100MHz) Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 5 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-3.3/1.5-W36-C Step Load Transient Response (Vin=7V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Step Load Transient Response (Vin=7V, Vout=nominal, Cload=0, Iout=1.5A to 0.75A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=12V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Step Load Transient Response (Vin=12V, Vout=nominal, Cload=0, Iout=1.5A to 0.75A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=36V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Step Load Transient Response (Vin=36V, Vout=nominal, Cload=0, Iout=1.5A to 0.75A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 6 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-5/1.5-W36-C ABSOLUTE MAXIMUM RATINGS Conditions ① Minimum Typical/Nominal Maximum Units Input Voltage, Continuous Full power operation 0 36 Vdc Input Reverse Polarity None, install external fuse None Vdc Output Power 0 7.80 W Output Current Current-limited, no damage, short-circuit protected 0 1.5 A Storage Temperature Range Vin = Zero (no power) -55 125 °C Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifications Table is not implied or recommended. INPUT Operating voltage range 7 12 36 Vdc Recommended External Fuse Fast blow 2 A Reverse Polarity Protection ⑨ None, install external fuse None Vdc Internal Filter Type C-TYPE Input current Full Load Conditions Vin = nominal 0.69 0.73 A Low Line Vin @ min 1.16 1.22 A Inrush Transient 0.16 A2-Sec. Short Circuit Input Current 5 mA No Load Input Current Vin = nominal 5 10 mA Shut-Down Mode Input Current 1 mA Reflected (back) ripple current ② (Cin = 2 X 100uF, CBus = 1000uF, LBus = 1uH) 15 mA, pk-pk GENERAL and SAFETY @ Vin nom, 5Vout 89.0 90.5 % Efficiency @ Vin min, 5Vout 91.4 92.5 % Certified to UL-60950-1, IEC/EN60950-1, Safety Yes 2nd Edition Per Telcordia SR332, issue 1, class 3, ground Calculated MTBF ④ fixed, Tambient=+25°C 78.7 Hours x 106 DYNAMIC CHARACTERISTICS Fixed Switching Frequency 500 kHz 50-100-50% load step, settling time to within Dynamic Load Response 50 75 μSec ±2% of Vout di/dt =1A/μSec Dynamic Load Peak Deviation same as above 150 200 mV www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 7 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-5/1.5-W36-C (CONT.) OUTPUT Conditions Minimum Typical/Nominal Maximum Units Total Output Power 0 7.5 7.8 W Voltage Nominal Output Voltage Range 4.8 5.0 5.2 Vdc Setting Accuracy At 50% load -4 4 % of Vnom. Output Voltage Overshoot - Startup: 3 %Vo nom Current Output Current Range 0 1.5 1.5 A Minimum Load ⑪ No minimum load Current Limit Inception 98% of Vnom., after warmup @5Vout 2.50 3.50 5.00 A Short Circuit Mode ⑥⑪ Hiccup technique, autorecovery within Short Circuit Current 0.01 A ±1% of Vout Short Circuit Duration Output shorted to ground, no damage Continuous (remove short for recovery) Short circuit protection method ⑧ Current limiting Regulation ⑩ Total Regulation Band Over all line, load and temp conditions -3 Vo set 3 % Vo set Line Regulation Vin=min. to max. Vout=nom. ±0.25 % Load Regulation Iout=min. to max. ±0.40 % Ripple and Noise (20MHz BW) ⑪ 5Vo, 12Vin 50 75 mV pk-pk Temperature Coefficient At all outputs ±0.02 % of Vnom./°C Maximum Capacitive Loading low ESR; >0.001, <0.01 ohm 300 μF Maximum Capacitive Loading 0.01 ohm 3300 μF MECHANICAL Outline Dimensions 0.41 x 0.65 x 0.34 Inches 10.4 x 16.5 x 8.64 mm Weight 0.07 Ounces 2 Grams Pin Material copper alloy Pin Finish Matte Tin 100-300 μ" Nickel 75-150 μ" ENVIRONMENTAL Operating Ambient Temperature Range ③ see derating curves -40 85 °C Storage Temperature Vin = Zero (no power) -55 125 °C RoHS Compliant RoHS-6 Specification Notes: 1) All specifications are typical unless noted. General conditions for Specifications are +25 deg.C ambient 7) The output is not intended to sink appreciable reverse current. temperature, Vin=nominal, Vout=nominal, full rated load. Adequate airflow must be supplied for extended 8) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current testing under power. See Derating curves.. output. If the overcurrent condition still exists, the restart current will be removed and then tried again. 2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 This short current pulse prevents overheating and damaging the converter. x 100 μF, Cbus=1000 μF, Lbus=1 μH. All caps are low ESR types. 9) Input Fusing: If reverse polarity is accidentally applied to the input, to ensure reverse input protection, 3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher always connect an external input fast-blow fuse in series with the +Vin input. Use approximately twice the temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total full input current rating with nominal input voltage. RMS current over time does not exceed the Derating curve. All Derating curves are presented near sea 10) Regulation specifications describe the deviation as the line input voltage or output load current is varied level altitude. Be aware of reduced power dissipation with increasing altitude. from a nominal midpoint value to either extreme. 4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground 11) Output noise may be further reduced by installing an external filter. Do not exceed the maximum output fixed conditions, Tpcboard=+25 ˚C, full output load, natural air convection. capacitance. At zero output current and no external capacitor, the output may contain low frequency 5) The input and output are not isolated. They share a single COMMON power and signal return. components which exceed the ripple specification. The output may be operated indefinitely with no load. 6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. Output current limit and short circuit protection are non-latching. When the overcurrent fault is removed, the converter will immediately recover. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 8 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-5/1.5-W36-C Efficiency vs. Line Voltage and Load Current @ +25˚C. (Vout = Vnom.) Maximum Current Temperature Derating at sea level (Vin=7V to 36V) 100 2.00 90 80 VIN = 7V 70 VIN = 12V %) 60 VIN = 36V mps) 0.33 m/s (65 LFM) Efficiency ( 5400 put Current (A1.00 30 ut O 20 10 0 0.00 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 20 25 30 35 40 45 50 55 60 65 70 75 80 85 Load Current (Amps) Ambient Temperature (ºC) Output Ripple and Noise (Vin=7V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., Output Ripple and Noise (Vin=12V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) ScopeBW=100MHz) Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 9 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-5/1.5-W36-C Step Load Transient Response (Vin=7V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Step Load Transient Response (Vin=7V, Vout=nominal, Cload=0, Iout=1.5A to 0.75A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=12V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Step Load Transient Response (Vin=12V, Vout=nominal, Cload=0, Iout=1.5A to 0.75A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=36V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Step Load Transient Response (Vin=36V, Vout=nominal, Cload=0, Iout=1.5A to 0.75A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 10 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-12/1.0-W36-C ABSOLUTE MAXIMUM RATINGS Conditions ① Minimum Typical/Nominal Maximum Units Input Voltage, Continuous Full power operation 0 36 Vdc Input Reverse Polarity None, install external fuse None Vdc Output Power 0 5.15 W Output Current Current-limited, no damage, short-circuit protected 0 1.0 A Storage Temperature Range Vin = Zero (no power) -55 125 °C Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifications Table is not implied or recommended. INPUT Operating voltage range 15 24 36 Vdc Recommended External Fuse Fast blow 2 A Reverse Polarity Protection ⑨ None, install external fuse None Vdc Internal Filter Type C-TYPE Input current Full Load Conditions Vin = nominal 0.53 0.56 A Low Line Vin @ min 0.84 0.87 A Inrush Transient 0.16 A2-Sec. Short Circuit Input Current 5 mA No Load Input Current Vin = nominal 5 10 mA Shut-Down Mode Input Current 1 mA Reflected (back) ripple current ② (Cin = 2 X 100uF, CBus = 1000uF, LBus = 1uH) 30 mA, pk-pk GENERAL and SAFETY @ Vin nom, 12Vout 93.5 95.3 % Efficiency @ Vin min, 12Vout 95.5 97.0 % Certified to UL-60950-1, IEC/EN60950-1, Safety Yes 2nd Edition Per Telcordia SR332, issue 1, class 3, ground Calculated MTBF ④ fixed, Tambient=+25°C 25.9 Hours x 106 DYNAMIC CHARACTERISTICS Fixed Switching Frequency 500 kHz 50-100-50% load step, settling time to within Dynamic Load Response 50 75 μSec ±2% of Vout di/dt =1A/μSec Dynamic Load Peak Deviation same as above 165 225 mV www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 11 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-12/1.0-W36-C (CONT.) OUTPUT Conditions Minimum Typical/Nominal Maximum Units Total Output Power 0 12.0 12.5 W Voltage Nominal Output Voltage Range 11.52 12.0 12.48 Vdc Setting Accuracy At 50% load -4 4 % of Vnom. Output Voltage Overshoot - Startup: 3 %Vo nom Current Output Current Range 0 1.0 1.0 A Minimum Load ⑪ No minimum load Current Limit Inception 98% of Vnom., after warmup @12Vout 2.50 3.50 5.00 A Short Circuit Mode ⑥⑪ Hiccup technique, autorecovery within Short Circuit Current 0.01 A ±1% of Vout Short Circuit Duration Output shorted to ground, no damage Continuous (remove short for recovery) Short circuit protection method ⑧ Current limiting Regulation ⑩ Total Regulation Band Over all line, load and temp conditions -3 Vo set 3 % Vo set Line Regulation Vin=min. to max. Vout=nom. ±0.25 % Load Regulation Iout=min. to max. ±0.40 % Ripple and Noise (20MHz BW) ⑪ 12Vo, 24Vin 50 75 mV pk-pk Temperature Coefficient At all outputs ±0.02 % of Vnom./°C Maximum Capacitive Loading low ESR; >0.001, <0.01 ohm 300 μF Maximum Capacitive Loading 0.01 ohm 3300 μF MECHANICAL Outline Dimensions 0.41 x 0.65 x 0.34 Inches 10.4 x 16.5 x 8.64 mm Weight 0.07 Ounces 2 Grams Pin Material copper alloy Pin Finish Matte Tin 100-300 μ" Nickel 75-150 μ" ENVIRONMENTAL Operating Ambient Temperature Range ③ see derating curves -40 85 °C Storage Temperature Vin = Zero (no power) -55 125 °C RoHS Compliant RoHS-6 Specification Notes: 1) All specifications are typical unless noted. General conditions for Specifications are +25 deg.C ambient 7) The output is not intended to sink appreciable reverse current. temperature, Vin=nominal, Vout=nominal, full rated load. Adequate airflow must be supplied for extended 8) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current testing under power. See Derating curves.. output. If the overcurrent condition still exists, the restart current will be removed and then tried again. 2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 This short current pulse prevents overheating and damaging the converter. x 100 μF, Cbus=1000 μF, Lbus=1 μH. All caps are low ESR types. 9) Input Fusing: If reverse polarity is accidentally applied to the input, to ensure reverse input protection, 3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher always connect an external input fast-blow fuse in series with the +Vin input. Use approximately twice the temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total full input current rating with nominal input voltage. RMS current over time does not exceed the Derating curve. All Derating curves are presented near sea 10) Regulation specifications describe the deviation as the line input voltage or output load current is varied level altitude. Be aware of reduced power dissipation with increasing altitude. from a nominal midpoint value to either extreme. 4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Issue 2, Class 3, 11) Output noise may be further reduced by installing an external filter. Do not exceed the maximum output ground benign, controlled conditions, Tpcboard=+25 ˚C, full output load, natural air convection. capacitance. At zero output current and no external capacitor, the output may contain low frequency 5) The input and output are not isolated. They share a single COMMON power and signal return. components which exceed the ripple specification. The output may be operated indefinitely with no load. 6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. Output current limit and short circuit protection are non-latching. When the overcurrent fault is removed, the converter will immediately recover. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 12 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-12/1.0-W36-C Efficiency vs. Line Voltage and Load Current @ +25˚C. (Vout = Vnom.) Maximum Current Temperature Derating at sea level (Vin=15V to 36V) Output Ripple and Noise (Vin=15V, Vout=nominal, Iout=1A, Cload=0, Ta=+25˚C, Output Ripple and Noise (Vin=24V, Vout=nominal, Iout=1A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) ScopeBW=100MHz) Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 13 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-12/1.0-W36-C Step Load Transient Response (Vin=15V, Vout=nominal, Cload=0, Iout=0.5A to 1.0A, Step Load Transient Response (Vin=15V, Vout=nominal, Cload=0, Iout=1.0A to 0.5A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=24V, Vout=nominal, Cload=0, Iout=0.5A to 1.0A, Step Load Transient Response (Vin=24V, Vout=nominal, Cload=0, Iout=1.0A to 0.5A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=36V, Vout=nominal, Cload=0, Iout=0.5A to 1.0A, Step Load Transient Response (Vin=36V, Vout=nominal, Cload=0, Iout=1.0A to 0.5A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 14 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC MECHANICAL SPECIFICATIONS -- VERTICAL MOUNT 0.41 0.34 MAX (8.6) (10.4) 0.18 MAX (4.6) C 0.205 L 0.06 (5.2) (1.5) REF REF 0.65 (16.5) Pin #3 0.13 (3.3) Pin #1 0.030±0.002 0.100 (2.5) 0.05 (1.3) 0.200 (5.1) Pin #1 PIN MATERIAL: COPPER ALLOY PIN FINISH: PURE MATTE TIN 100-300 u" OVER 75-150 u" NICKEL Pin #1 Dimensions are in inches (mm shown for ref. only). INPUT/OUTPUT CONNECTIONS OKI-78SR Third Angle Projection Pin Function 1 Positive Input 2 Common (Ground) 3 Positive Output Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 1˚ Components are shown for reference only. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 15 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC MECHANICAL SPECIFICATIONS -- HORIZONTAL MOUNT 0.41 0.34 MAX (8.6) (10.4) 0.18 MAX (4.6) 0.205 CL 0.06 (5.2) (1.5) REF REF 0.65 .025 (0.635) (16.5) (3 PLS) Pin #1 Pin #3 0.17 +.01 .05 (1.3)±.01 0.100 (2.5) (4.318) - .02 0.200 (5.1) Pin #1 PIN MATERIAL: COPPER ALLOY PIN FINISH: PURE MATTE TIN 100-300 u" OVER 75-150 u" NICKEL Pin #1 Dimensions are in inches (mm shown for ref. only). INPUT/OUTPUT CONNECTIONS OKI-78SR Third Angle Projection Pin Function 1 Positive Input 2 Common (Ground) 3 Positive Output Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 1˚ Components are shown for reference only. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 16 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC RECOMMENDED FOOTPRINTS www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 17 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC PACKAGING INFORMATION www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 18 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC TECHNICAL NOTES Input Fusing Certain applications and/or safety agencies may require fuses at the inputs of TO power conversion components. Fuses should also be used when there is the OSCILLOSCOPE CURRENT PROBE possibility of sustained input voltage reversal which is not current-limited. For +VIN greatest safety, we recommend a fast blow fuse installed in the ungrounded + LBUS input supply line. The installer must observe all relevant safety standards and regulations. For VIN +– CBUS CIN safety agency approvals, install the converter in compliance with the end-user – safety standard. -VIN Recommended Input Filtering CIN = 2 x 100μF, ESR < 700mΩ @ 100kHz The user must assure that the input source has low AC impedance to provide CBUS = 1000μF, ESR < 100mΩ @ 100kHz dynamic stability and that the input supply has little or no inductive content, LBUS = 1μH including long distributed wiring to a remote power supply. The converter will Figure 3 Measuring Input Ripple Current operate with no additional external capacitance if these conditions are met. For best performance, we recommend installing a low-ESR capacitor immediately adjacent to the converter’s input terminals. The capacitor should be a ceramic type such as the Murata GRM32 series or a polymer type. Initial suggested capacitor values are 10 to 22 μF, rated at twice the expected maxi- +VOUT mum input voltage. Make sure that the input terminals do not go below the undervoltage shutdown voltage at all times. More input bulk capacitance may be added in parallel (either electrolytic or tantalum) if needed. C1 C2 SCOPE RLOAD Recommended Output Filtering The converter will achieve its rated output ripple and noise with no additional -VOUT external capacitor. However, the user may install more external output capaci- tance to reduce the ripple even further or for improved dynamic response. Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors. C1 = 1μF Initial values of 10 to 47 μF may be tried, either single or multiple capacitors in C2 = 10μF parallel. Mount these close to the converter. Measure the output ripple under LOAD 2-3 INCHES (51-76mm) FROM MODULE your load conditions. Figure 4. Measuring Output Ripple and Noise (PARD) Use only as much capacitance as required to achieve your ripple and noise objectives. Excessive capacitance can make step load recovery sluggish or possibly introduce instability. Do not exceed the maximum rated output capaci- tance listed in the specifications. Input Ripple Current and Output Noise All models in this converter series are tested and specified for input reflected ripple current and output noise using designated external input/output compo- nents, circuits and layout as shown in the following figures. The Cbus and Lbus components simulate a typical DC voltage bus. Please note that the values of Cin, Lbus and Cbus will vary according to the specific converter model. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 19 of 20

OKI-78SR Series Non-Isolated Switching Regulator DC-DC Minimum Output Loading Requirements Output Fusing All models regulate within specification and are stable under no load to full The converter is extensively protected against current, voltage and temperature load conditions. Operation under no load might however slightly increase extremes. However your output application circuit may need additional protec- output ripple and noise. tion. In the extremely unlikely event of output circuit failure, excessive voltage could be applied to your circuit. Consider using an appropriate fuse in series Temperature Derating Curves with the output. The graphs in this data sheet illustrate typical operation under a variety of conditions. The Derating curves show the maximum continuous ambient air Output Current Limiting temperature and decreasing maximum output current which is acceptable Current limiting inception is defined as the point at which full power falls below under increasing forced airflow measured in Linear Feet per Minute (“LFM”). the rated tolerance. See the Performance/Functional Specifications. Note par- Note that these are AVERAGE measurements. The converter will accept brief ticularly that the output current may briefly rise above its rated value in normal increases in current or reduced airflow as long as the average is not exceeded. operation as long as the average output power is not exceeded. This enhances reliability and continued operation of your application. If the output current is Note that the temperatures are of the ambient airflow, not the converter too high, the converter will enter the short circuit condition. itself which is obviously running at higher temperature than the outside air. Also note that “natural convection” is defined as very flow rates which are not Output Short Circuit Condition using fan-forced airflow. Depending on the application, “natural convection” is When a converter is in current-limit mode, the output voltage will drop as the usually about 30-65 LFM but is not equal to still air (0 LFM). output current demand increases. If the output voltage drops too low (approxi- mately 98% of nominal output voltage for most models), the bias voltage may Murata Power Solutions makes Characterization measurements in a closed shut down the PWM controller. Following a time-out period, the PWM will cycle wind tunnel with calibrated airflow. We use both thermocouples and an restart, causing the output voltage to begin rising to its appropriate value. If the infrared camera system to observe thermal performance. As a practical matter, short-circuit condition persists, another shutdown cycle will initiate. This rapid it is quite difficult to insert an anemometer to precisely measure airflow in on/off cycling is called “hiccup mode”. The hiccup cycling reduces the average most applications. Sometimes it is possible to estimate the effective airflow if output current, thereby preventing excessive internal temperatures and/or you thoroughly understand the enclosure geometry, entry/exit orifice areas and component damage. the fan flowrate specifications. The “hiccup” system differs from older latching short circuit systems CAUTION: If you routinely or accidentally exceed these Derating guidelines, because you do not have to power down the converter to make it restart. The the converter may have an unplanned Over Temperature shut down. Also, these system will automatically restore operation as soon as the short circuit condi- graphs are all collected at near Sea Level altitude. Be sure to reduce the derat- tion is removed. ing for higher altitude. Soldering Guidelines Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifica- tions may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers. Wave Solder Operations for through-hole mounted products (THMT) For Sn/Ag/Cu based solders: For Sn/Pb based solders: Maximum Preheat Temperature 115° C. Maximum Preheat Temperature 105° C. Maximum Pot Temperature 270° C. Maximum Pot Temperature 250° C. Maximum Solder Dwell Time 7 seconds Maximum Solder Dwell Time 6 seconds This product is subject to the following operating requirements Murata Power Solutions, Inc. and the Life and Safety Critical Application Sales Policy: 129 Flanders Road, Westborough, MA 01581 U.S.A. Refer to: http://www.murata-ps.com/requirements/ ISO 9001 and 14001 REGISTERED Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. © 2017 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 20 of 20

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M urata: OKI-78SR-3.3/1.5-W36-C OKI-78SR-5/1.5-W36-C OKI-78SR-3.3/1.5-W36H-C OKI-78SR-5/1.5-W36H-C OKI-78SR- 12/1.0-W36H-C OKI-78SR-12/1.0-W36-C