NMXU Series
Isolated 5W Single & Dual Output DC/DC Converters
KDC_NMXU.C02 Page 1 of 3
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SELECTION GUIDE
Order Code
Nominal Input
Voltage
Output
Voltage Output Current Efficiency
(Typ.)
Isolation
Capacitance
(Typ.)
MTTF1
V V A % pF kHrs
NMXD0505UC 5 ±5 ±0.5 75 31.5 779
NMXD0512UC 5 ±12 ±0.208 75 33 158
NMXD0515UC 5 ±15 ±0.167 75 34.2 86
NMXD1205UC 12 ±5 ±0.5 75 34.7 233
NMXD1212UC 12 ±12 ±0.208 75 52.9 107
NMXD1215UC 12 ±15 ±0.167 75 59.9 68
NMXS0505UC 5 5 1.0 75 30.6 792
NMXS0512UC 5 12 0.417 75 31.2 158
NMXS0515UC 5 15 0.333 75 32.6 86
NMXS1205UC 12 5 1.0 75 32.5 233
NMXS1212UC 12 12 0.417 75 51.9 107
NMXS1215UC 12 15 0.333 75 54.1 68
When operated with additional external load capacitance the rise time of the input voltage will determine the maximum external
capacitance value for guaranteed start up. The slower the rise time of the input voltage the greater the maximum value of the
additional external capacitance for reliable start up.
INPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Voltage range Continuous operation, 5V input types 4.5 5.0 5.5 V
Continuous operation, 12V input types 10.8 12.0 13.2
Reflected ripple voltage BW=DC to 20MHz, all output types 200 mV
OUTPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Rated Power TA= 0°C to 70°C 5.0 W
Voltage Set Point Accuracy See tolerance envelope
Line regulation High VIN to low VIN 1.1 %/%
Load Regulation 10% load to rated load, 5V output types 7 12 %
10% load to rated load, 12V & 15V output types 5 7.5
Ripple and Noise BW=DC to 20MHz, all output types 125 mV p-p
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection21 second
Lead temperature 1.5mm from case for 10 seconds 300°C
Input voltage VIN, NMXU05 types 7V
Input voltage VIN, NMXU12 types 15V
1. Calculated using MIL-HDBK-217F with nominal input voltage at full load.
2. Supply voltage must be disconnected at the end of the short circuit duration.
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
FEATURES
RoHS compliant
Single or dual output
1kVDC isolation
Pin compatible with NMXSO series
Power density 0.85W/cm3
UL 94V-0 package material
Footprint 5.88cm2
Industry standard pinout
5V & 12V input
5V, 12V & 15V output
No heatsink required
Internal SMD construction
Fully encapsulated with toroidal magnetics
No external components required
PCB mounting
DESCRIPTION
The NMXU series of DC/DC converters is par-
ticularly suited to isolating and/or converting DC
power rails. The galvanic isolation allows the
device to be configured to provide an isolated
negative rail in systems where only positive rails
exist. The devices are particularly suited for use
in distributed power systems where there is low
variation in the bus voltage levels.
NMXU Series
Isolated 5W Single & Dual Output DC/DC Converters
KDC_NMXU.C02 Page 2 of 3
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ISOLATION CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Isolation test voltage Flash tested for 1 second 1000 VDC
Resistance Viso= 1000VDC 1 GΩ
GENERAL CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Switching frequency All input types 70 kHz
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Specification All output types 0 70
°C
Storage -55 100
Case temperature rise above
ambient
5V output types 30
All other output types 20
Cooling Free air convection
TOLERANCE ENVELOPE
+10%
Output Load Current (%)
Output Voltage
+5%
-7.5%
-2.5%
+2.5%
Typical Load Line
VNOM
100
75
50
25
10
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 NMXU 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 NMXU 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 materi-
als, construction and environment. The NMXU 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.
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering
systems with a peak wave solder temperature of
300ºC for 10 seconds. The pin termination finish
on this product series is Matte Tin over Nickel
Preplate. The series is backward compatible with
Sn/Pb soldering systems.
For further information, please visit www.murata-ps.com/rohs
NMXU Series
Isolated 5W Single & Dual Output DC/DC Converters
KDC_NMXU.C02 Page 3 of 3
www.murata-ps.com/support
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
MECHANICAL DIMENSIONS PIN CONNECTIONS
Single Output Variants Dual Output Variants
Pin Function Pin Function
1-VIN 1VIN
2+VIN 2+VIN
3+VOUT 3+VOUT
4 Not fitted 4 Common
5-V
OUT 5-VOUT
RECOMMENDED FOOTPRINT DETAILS
TUBE OUTLINE DIMENSIONS
* Pin not fitted on single output variants.
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: 10g
0.4 (10.16)
0.4 (10.16)
0.093 (2.35)
0.2 (5.08)
0.80
(20.32)
0.157 (4.0)
0.394
(10.00)
0.925
(23.50)
0.985 (25.03)
XYYWW
NMXD0515UC
0.063 (1.59)
1 2
3 4 5 *
0.035±0.00197
(0.90±0.05)
0.0098±
0
(0.25±0.
)0-&4
* Hole not required for single output variants
All dimensions in inches ±0.01 (mm ±0.25mm).
Not to scale.
All dimensions in inches ±0.01 (mm ±0.25mm).
