NMK Series
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
KDC_NMK.E07 Page 1 of 6
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SELECTION GUIDE
Order Code3
Nominal Input
Voltage
Output
Voltage
Output Current
Input Current at
Rated Load
Load Regulation
(Typ)
Load Regulation
(Max)
Ripple & Noise
(Typ)1
Ripple & Noise
(Max)1
Efficiency (Min.)
Efficiency (Typ.)
Isolation
Capacitance
MTTF2
V V mA mA % mVp-p % % pF MIL. Tel.
kHrs
NMK0505SAC 5 5 400 470 5.7 7.3 24 40 80 83 28 3998
NMK0509SAC 5 9 222 455 4.2 5.9 20 25 83 86 36 3718
NMK0512SAC 5 12 167 450 3.8 5.1 18 20 83 87 36 3328
NMK0515SAC 5 15 133 450 3.4 4.5 17 20 84 87 34 2855
NMK1205SAC 12 5 400 200 4.2 4.9 25 30 80 83 33 3532
NMK1209SAC 12 9 222 190 2.6 3.1 19 20 83 87 53 2417
NMK1212SAC 12 12 167 190 2.4 2.9 17 23 85 88 62 2246
NMK1215SAC 12 15 133 185 2.0 2.4 14 25 84 89 56 2020
NMK1505SAC 15 5 400 158 4.3 5.5 34 55 81 84 37 2202 9857
NMK1509SAC 15 9 222 153 3 4 21 40 83 86 51 2478 11668
NMK1512SAC 15 12 167 150 2.5 3.5 20 40 84 87 63 1825 10324
NMK1515SAC 15 15 133 149 2.4 3.5 20 40 85 88 72 2220 13067
NMK2405SAC 24 5 400 99 4.2 5.5 42 70 80 84 41 1618 9838
NMK2409SAC 24 9 222 95 2.7 3.5 30 55 83 87 59 2032 12177
NMK2412SAC 24 12 167 94 2.1 3 29 55 84 88 77 1879 12287
NMK2415SAC 24 15 133 93 2.2 3 34 70 85 88 85 1558 11155
NMK0505SC 5 ±5 ±200 470 5 6.2 24 40 81 83 28 2324
NMK0509SC 5 ±9 ±111 455 3.9 5.3 18 30 83 86 33 2158
NMK0512SC 5 ±12 ±83 450 3.7 4.8 14 20 84 87 35 1931
NMK0515SC 5 ±15 ±67 450 3.5 5.2 12 20 84 87 31 1655
NMK1205SC 12 ±5 ±200 200 3.4 3.9 21 30 80 84 35 1952
NMK1209SC 12 ±9 ±111 190 2.4 2.8 16 20 83 87 50 2021
NMK1212SC 12 ±12 ±83 190 2.2 2.7 13 20 84 87 53 1821
NMK1215SC 12 ±15 ±67 190 1.9 2.4 13 20 83 87 57 1574
NMK1505SC 15 ±5 ±200 156 3.7 5 27 50 81 84 43 1466 8190
NMK1509SC 15 ±9 ±111 153 2.4 3.5 19 35 82 86 47 1957 11117
NMK1512SC 15 ±12 ±83 151 2.2 3 18 35 84 88 65 1515 10279
NMK1515SC 15 ±15 ±67 150 2.0 3 14 35 85 88 74 1404 11747
NMK2405SC 24 ±5 ±200 96 3.4 5 30 50 81 84 43 2268 12558
NMK2409SC 24 ±9 ±111 94 2.3 3.5 26 45 84 87 65 2571 12903
NMK2412SC 24 ±12 ±83 93 1.9 3 24 45 85 89 82 2134 12888
NMK2415SC 24 ±15 ±67 93 1.7 3 17 35 85 89 86 1581 12750
INPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Voltage range
Continuous operation, 5V input types 4.5 5 5.5
V
Continuous operation, 12V input types 10.8 12 13.2
Continuous operation, 15V input types 13.5 15 16.5
Continuous operation, 24V input types 21.6 24 26.4
Reflected ripple current
NMK2405SAC, NMK2409SAC, NMK2405SC,
NMK2409SC 14 25 mA p-p
All other variants 7.5 15
1. See Ripple & Noise characterisation method.
2. Calculated using MIL-HDBK-217 FN2 and Telcordia SR-332 calculation model with nominal input voltage at full load.
3. See application notes on page 3.
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
PRODUCT OVERVIEW
The NMK series of industrial temperature range
DC-DC converters, available in industry standard
SIP packaging offers a power upgrade path from
the 1W NMV series. The un-regulated NMK series
has superior output voltage set point accuracy in
conjunction with excellent load regulation for this
converter type.
Unbalanced loading capabilities on dual output
variants, all of the rated output power may be
drawn from a single output 3.
FEATURES
UL60950 recognised
RoHS compliant
Efficiency from 80%
Power density 1.31W/cm3
Wide temperature performance at full
2 Watt load, –40°C to 85°C
UL 94V-0 package material
No heatsink required
Industry standard pinout
3kVDC isolation (1 minute) ‘Hi Pot Test’
5V, 12V, 15V & 24V inputs
5V, 9V, 12V, & 15V output
Fully encapsulated with toroidal
magnetics
No electrolytic or tantalum capacitors
Pin compatible with MEV1, MEV3 & NMV
series
NMK Series
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
KDC_NMK.E07 Page 2 of 6
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OUTPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Rated Power TA=-40°C to 85°C 2W
Voltage Set Point Accuracy See tolerance envelope
Line regulation High VIN to low VIN 1.05 1.2 %/%
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds 260°C
Input voltage VIN, NMK05 types 7V
Input voltage VIN, NMK12 types 15V
Input voltage VIN, NMK15 types 18V
Input voltage VIN, NMK24 types 28V
ISOLATION CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Isolation test voltage Flash tested for 1 minute 3000 VDC
Resistance Viso= 1000VDC 10 GΩ
GENERAL CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Switching frequency 60 kHz
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Specification All output types -40 85
°C
Storage -50 125
Case Temperature above ambient
5V output types & NMK1509SAC (Except NMK1505S(A)C & NMK2405S(A) 28
NMK1505S(A)C & NMK2405S(A)C 32
All other output types 25
Cooling Free air convection
TEMPERATURE DERATING GRAPH TOLERANCE ENVELOPE
Output Load Current (%)
egatloV tuptuO
VNOM
5%
0%
-4%
2%
Typical Load Line
100
75
50
25
10
Output Load Current (%)
egatloV tuptuO
VNOM
5%
0%
-3%
1%
Typical Load Line
100
75
50
25
10
150100
50
0
-40
0
1
2
3
Safe Operating Area
85°C
Ambient Temperature (°C)
Output Power (W)
NMKXXXXSAC NMKXXXXSC
NMK Series
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
KDC_NMK.E07 Page 3 of 6
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RoHS COMPLIANT INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260°C for 10 seconds. The pin
termination finish on the SIP package type is Tin Plate, Hot Dipped over Matte Tin with Nickel Preplate. The DIP types are Matte
Tin over Nickel Preplate. Both types in this series are backward compatible with Sn/Pb soldering systems.
For further information, please visit www.murata-ps.com/rohs
SAFETY APPROVAL
The NMK series has been recognised by Underwriters Laboratory (UL) to UL 60950 for functional insulation in a maximum ambient temperature of 85ºC and/or case temperature
limit of 130ºC. Case temperature measured on the face opposite the pins. File number E151252 applies.
The NMK Series of converters are not internally fused so to meet the requirements of UL 60950 an anti-surge input line fuse should always be used as below:
NMK05xxSC/SAC: 2A
NMK12xxSC/SAC: 0.75A
NMK15xxSC/SAC: 0.75A
NMK24xxSC/SAC: 0.375A
TECHNICAL NOTES
ISOLATION VOLTAGE
‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test voltage,
applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.
Murata Power Solutions NMK series of DC-DC converters are all 100% production tested at their stated isolation voltage. This is 3kVDC for 1 minute.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The NMK series has been recognized by Underwriters Laboratory for functional insulation. Both input and output should normally be maintained within SELV limits i.e. less than
42.4V peak, or 60VDC. The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation sys-
tem. The part could be expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; but then the circuitry on both sides of the
barrier must be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible circuitry
according to safety standard requirements.
REPEATED HIGH-VOLTAGE ISOLATION TESTING
It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials,
construction and environment. The NMK series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enamelled wire. While
parts can be expected to withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any material, including this enamel (typically
polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. We
therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specified test voltage.
This consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further
insulation system of physical spacing or barriers.
APPLICATION NOTES
Minimum Load
The minimum load to meet datasheet specification is 10% of the full rated load across the specified input voltage range. Lower than 10% minimum loading will result in an
increase in output voltage, which may rise to typically double the specified output voltage if the output load falls to less than 5%.
Unbalanced Load
The NMK series offers unbalanced loading capabilities with up to the full 2W available from a single output. However, when operated in this mode there may be a slight
performance decrease in efficiency and load regulation.
NMK Series
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
KDC_NMK.E07 Page 4 of 6
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APPLICATION NOTES (continued)
Ripple & Noise Characterisation Method
All measurement to be taken with the following components connected to the UUT as detailed below.
50 Ohm coax cable, solder connections one end, BNC plug at the other end.
C1 1μF X7R multilayer ceramic capacitor rated at minimum 3 x the output voltage of the UUT
C2 10μF tantalum capacitor rated at minimum 1.5 x the output voltage of the UUT with ESR of less than 100 milliohms at 100 kHz e.g. AVX TPS
C3 100nF multilayer ceramic capacitor, general purpose
R1 450 Ohm resistor, carbon film, ±1%
R2 50 Ohm BNC termination
T1 3T of the coax cable through a ferrite toroid eg Ferroxcube TN32/19/13-3E25
RLOAD Resistive load at the UUT maximum rating. Connections via twisted wires.
Differential Mode Noise Test Schematic
OSCILLOSCOPE
Y INPUT
SUPPLY
C1 C2 C3 R1 T1 R2
Input Output
DC/DC Converter
R LOAD
+
+
-
-
EFFICIENCY VS LOAD
NMK05XXSAC NMK12XXSAC
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100
Load (%)
Efficiency (%)
5V
9V
12V
15V
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100
Load (%)
Efficiency (%)
5V
9V
12V
15V
NMK Series
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
KDC_NMK.E07 Page 5 of 6
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EFFICIENCY VS LOAD (continued)
NMK15XXSAC NMK24XXSAC
NMK05XXSC NMK12XXSC
NMK15XXSC NMK24XXSC
0
10
20
30
40
50
60
70
80
90
0 10203040506070809010
0
Load (%)
Efficiency (%)
5V
9V
12V
15V
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100
Load (%)
Efficiency (%)
5V
9V
12V
15V
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100110
Efficiency (%)
Load (%)
5V
9V
12V
15V
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100110
Efficiency (%)
Load (%)
5V
9V
12V
15V
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100110
Efficiency (%)
Load (%)
5V
9V
12V
15V
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100110
Efficiency (%)
Load (%)
5V
9V
12V
15V
NMK Series
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
KDC_NMK.E07 Page 6 of 6
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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. © 2018 Murata Power Solutions, Inc.
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS RECOMMENDED FOOTPRINT DETAILS
TUBE OUTLINE DIMENSIONS
NMKXXXXSC
XYYWW
* Pin not fitted on single output variants.
All dimensions in mm (inches) Controlling dimension is mm.
All pins on a 2.54 (0.100) pitch and within ±0. l (0.004) of true position from pin l at seating plane ‘S’ Weight: 2.8g
5.0 [0.197]
12.43 [0.489]
18.0 [0.709]
9.3 [0.366]
Unless otherwise stated all dimensions in mm (inches) ±0.5mm.
Tube length : 520mm ±2mm (20.47). Tube Quantity : 25
* Hole not required for single output variants.
PIN CONNECTIONS
Single output variants Dual output variants
Pin Function Pin Function
1+VIN 1+VIN
2-VIN 2-VIN
5-VOUT 5-VOUT
7+VOUT 6OV
7+V
OUT
*
*
