NMH Series
Isolated 2W Dual Output DC/DC Converters
KDC_NMH.E03 Page 1 of 6
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For full details go to
www.murata-ps.com/rohs
SELECTION GUIDE
Order Code
Nominal
Input
Voltage
Output
Voltage
Output
Current
Input
Current at
Rated Load
Efficiency Isolation
Capacitance MTTF1Package
Style
V V mA mA % pF kHrs
NMH0505DC 5 ±5 ±200 500 80 24 1574
DIP
NMH0509DC 5 ±9 ±111 494 81 28 663
NMH0512DC 5 ±12 ±83 488 82 30 338
NMH0515DC 5 ±15 ±67 476 84 33 187
NMH0505SC 5 ±5 ±200 500 80 24 1574
SIP
NMH0509SC 5 ±9 ±111 494 81 28 663
NMH0512SC 5 ±12 ±83 488 82 30 338
NMH0515SC 5 ±15 ±67 476 84 33 187
NMH1205DC 12 ±5 ±200 208 80 35 490
DIP
NMH1209DC 12 ±9 ±111 201 83 55 343
NMH1212DC 12 ±12 ±83 198 84 63 229
NMH1215DC 12 ±15 ±67 198 84 66 148
NMH1205SC 12 ±5 ±200 208 80 35 490
SIP
NMH1209SC 12 ±9 ±111 201 83 55 343
NMH1212SC 12 ±12 ±83 198 84 63 229
NMH1215SC 12 ±15 ±67 198 84 66 148
NMH2405DC 24 ±5 ±200 103 81 41 318
DIP
NMH2409DC 24 ±9 ±111 98 85 75 249
NMH2412DC 24 ±12 ±83 97 86 95 183
NMH2415DC 24 ±15 ±67 97 86 104 127
NMH2405SC 24 ±5 ±200 103 81 41 318
SIP
NMH2409SC 24 ±9 ±111 98 85 75 249
NMH2412SC 24 ±12 ±83 97 86 95 183
NMH2415SC 24 ±15 ±67 97 86 104 127
NMH4805DC 48 ±5 ±200 51 82 45 235
DIP
NMH4809DC 48 ±9 ±111 51 82 74 195
NMH4812DC 48 ±12 ±83 49 85 90 152
NMH4815DC 48 ±15 ±67 49 85 112 112
NMH4805SC 48 ±5 ±200 51 82 45 235
SIP
NMH4809SC 48 ±9 ±111 51 82 74 195
NMH4812SC 48 ±12 ±83 49 85 90 152
NMH4815SC 48 ±15 ±67 49 85 112 112
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, 24V input types 21.6 24 26.4
Continuous operation, 48V input types 43.2 48 52.8
Reflected ripple current
5V input types 50
mA p-p
12V input types 70
24V input types 130
48V input types 200
1. Calculated using MIL-HDBK-217F with nominal input voltage at full load.
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
FEATURES
RoHS compliant
Efficiency up to 86%
Power density up to 1.44W/cm3
Wide temperature performance at full
2 watt load, –40°C to 85°C
Dual output from a single input rail
UL 94V-0 package material
No heatsink required
Footprint from 1.46cm2
Industry standard pinout
Power sharing on output
1kVDC isolation
5V, 12V, 24V & 48V input
5V, 9V, 12V and 15V output
Internal SMD construction
Fully encapsulated with toroidal
magnetics
No external components required
MTTF up to 1.5 million hours
No electrolytic or tantalum capacitors
DESCRIPTION
The NMH series of industrial temperature range
DC/DC converters are the standard buliding blocks
for on-board point-of-use power systems. They
are ideally suited for providing dual rail supplies
on single rail boards with the added benefit of
galvanic isolation to reduce circuit noise. All of
the rated power may be drawn from a single pin
provided the total load does not exceed 2 watts.
Pin compatibility with the NMA 1 watt series
ensures minimal effort in upgrading distributed
power systems.
NMH Series
Isolated 2W Dual Output DC/DC Converters
KDC_NMH.E03 Page 2 of 6
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TEMPERATURE DERATING GRAPH
150100
50
0
-40
0
1
2
3
Safe Operating Area
85°C
Ambient Temperature (°C)
Output Power (W)
TOLERANCE ENVELOPE
+10%
Output Load Current (%)
Output Voltage
+5%
-7.5%
-2.5%
+2.5%
Typical Load Line
VNOM
100
75
50
25
10
OUTPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Rated Power1TA=-40°C to 85°C 2W
Voltage Set Point Accuracy NMH0505DC/SC -5 7.5 %
All other types -5 5
Line regulation High VIN to low VIN 1.0 1.2 %/%
Load Regulation
10% load to rated load, 5V output types 5 10
%
10% load to rated load, 9V output types
31010% load to rated load, 12V output types
10% load to rated load, 15V output types
Ripple and Noise
BW=DC to 20MHz, 5V output types 150 200
mV p-p
BW=DC to 20MHz, 9V output types 100 150
BW=DC to 20MHz, 12V output types 80 150
BW=DC to 20MHz, 15V output types 70 150
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds 300°C
Internal power dissipation 300mW
Input voltage VIN, NMH05 types 7V
Input voltage VIN, NMH12 types 15V
Input voltage VIN, NMH24 types 28V
Input voltage VIN, NMH48 types 54V
ISOLATION CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Isolation test voltage Flash tested for 1 second 1000 VDC
Resistance Viso= 500V 1 10 GΩ
GENERAL CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Switching frequency
5V input types 95
kHz
12V input types 90
24V & 48V input types 80
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Specification All output types -40 85
°C
Storage -50 130
Case Temperature above ambient 5V output types 30
12V output types 25
Cooling Free air convection
1. See derating graph.
The voltage tolerance envelope shows typical load regulation characteristics for this
product series. The tolerance envelope is the maximum output voltage variation due
to changes in output loading.
NMH Series
Isolated 2W Dual Output DC/DC Converters
KDC_NMH.E03 Page 3 of 6
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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 NMH series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
For a part holding no specific agency approvals, such as the NMH series, 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 system. 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 NMH series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enameled 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%.
Capacitive loading and start up
Typical start up times for this series, with a typical input voltage rise time of 2.2µs and output capacitance of 10µF, are shown in the table below. The product
series will start into a capacitance of 47µF with an increased start time, however, the maximum recommended output capacitance is 10µF.
Typical Start-Up Wave Form
Start-up time Start-up time
µs µs
NMH0505SC 1072 NMH2405SC 1064
NMH0509SC 2481 NMH2409SC 1544
NMH0512SC 3546 NMH2412SC 4398
NMH0515SC 5380 NMH2415SC 4230
NMH1205SC 672 NMH4805SC 966
NMH1209SC 1152 NMH4809SC 1220
NMH1212SC 1580 NMH4812SC 2822
NMH1215SC 3150 NMH4815SC 4275
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of
300°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
NMH Series
Isolated 2W Dual Output DC/DC Converters
KDC_NMH.E03 Page 4 of 6
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APPLICATION NOTES (continued)
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration.
C1 1µF X7R m ultilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter
C2 10µF tantalum capacitor, voltage rating to be a minimum of 1.5 times the output voltage of the DC/DC converter with an ESR of less
than 100m at 100 kHz
C3 100nF multilayer ceramic capacitor, general purpose
R1 450 resistor, carbon film, ±1% tolerance
R2 50 BNC termination
T1 3T of the coax cable through a ferrite toroid
RLOAD Resistive load to the maximum power rating of the DC/DC converter. Connections should be made via twisted wires
Measured values are multiplied by 10 to obtain the specified values.
Differential Mode Noise Test Schematic
OUTPUT RIPPLE REDUCTION
By using the values of inductance and capacitance stated, the output ripple at the rated load is lowered to 5mV p-p max.
Component selection
Capacitor: Ceramic chip capacitors are recommended. It is required that the ESR (Equivalent Series Resistance) should be as low as possible, X7R types are recommended.
The voltage rating should be at least twice (except for 15V output), the rated output voltage of the DC/DC converter.
Inductor: The rated current of the inductor should not be less than that of the output of the DC/DC converter. At the rated current, the DC resistance of the inductor should be
such that the voltage drop across the inductor is <2% of the rated voltage of the DC/DC converter. The SRF (Self Resonant Frequency) should be >20MHz.
OSCILLOSCOPE
Y INPUT
SUPPLY
C1 C2 C3 R1 T1 R2
Input Output
DC/DC Converter
R LOAD
+
+
-
-
DC
DC
L
CLoad
Power
Source
Order Code L (µH) Inductor Order Codes C (µF)
SMD Through Hole
NMH0505XC 47 82473C 11R473C 4.7
NMH0509XC 47 82473C 11R473C 2.2
NMH0512XC 150 82154C 11R154C 3.3
NMH0515XC 100 82104C 11R104C 3.3
NMH1205XC 47 82473C 11R473C 4.7
NMH1209XC 47 82473C 11R473C 2.2
NMH1212XC 150 82154C 11R154C 3.3
NMH1215XC 100 82104C 11R104C 3.3
NMH2405XC 47 82473C 11R473C 4.7
NMH2409XC 47 82473C 11R473C 2.2
NMH2412XC 150 82154C 11R154C 3.3
NMH2415XC 100 82104C 11R104C 3.3
NMH4805XC 47 82473C 11R473C 4.7
NMH4809XC 47 82473C 11R473C 2.2
NMH4812XC 150 82154C 11R154C 3.3
NMH4815XC 100 82104C 11R104C 3.3
Product specification for MPS inductors can be found at:
1100R Series (Through Hole)
http://www.murata-ps.com/data/magnetics/kmp_1100r.pdf
8200 Series (SMD)
http://www.murata-ps.com/data/magnetics/kmp_8200c.pdf
NMH Series
Isolated 2W Dual Output DC/DC Converters
KDC_NMH.E03 Page 5 of 6
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PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS PIN CONNECTIONS - 14 PIN DIP
Pin Function
1-VIN
7NC
8OV
9+V
OUT
11 -VOUT
14 +VIN
PIN CONNECTIONS - 7 PIN SIP
Pin Function
1+VIN
2-VIN
4-VOUT
5OV
6+V
OUT
All dimensions in inches ±0.01 (mm ±0.25mm). All pins on a 0.1 (2.54) pitch and within ±0.01 (0.25) of true position. Weight: 2.85g (DIP) 2.76g (SIP)
DIP package SIP package
0.77 (19.50)
0.39
(9.80)
0.303
(7.70)
0.181 (4.60)
0.142 (3.60)
0.022 (0.55)
0.0178 (0.45)
0.6 (15.24)
0.084
(2.13)
0.3 (7.62) 0.0118 (0.30)
0.0078 (0.20)
0.043
(1.09)
0.1 (2.54)
1 7
14 11 9 8
XYYWWi
NMH0505DC
0.77
(19.50)
0.295
(7.50)
0.4
(10.00)
0.181 (4.60)
0.142 (3.60)
0.0118 (0.30)
0.0078 (0.20)
0.5 (12.70)
0.05
(1.25)
0.079
(2.00)
0.022 (0.55)
0.0178 (0.45)
0.1 (2.54)
0.022 (0.55)
0.0178 (0.45)
NMH0505SC
XYYWWi
1 2 4 5 6
NMH Series
Isolated 2W Dual Output DC/DC Converters
KDC_NMH.E03 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. © 2012 Murata Power Solutions, Inc.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
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 (continued)
RECOMMENDED FOOTPRINT DETAILS
TUBE OUTLINE DIMENSIONS
Unless otherwise stated all dimensions in inches (mm) ±0.5mm.
Tube length (14 Pin DIP) : 20.47 (520mm ±2mm).
Tube length (7 Pin SIP) : 20.47 (520mm ±2mm).
14 Pin DIP Tube 7 Pin SIP Tube
14 Pin DIP Package 7 Pin SIP Package
Tube Quantity : 25
0.1 (2.54)
0.045 (1.15)
0.039 (1.00)
Ø
0.1 (2.54)
0.045 (1.15)
0.039 (1.00)
Ø
0.1 (2.54)
0.1 (2.54)
5 HOLES
0.00394 (0.1)
5 HOLES
0.00394 (0.1
