suited for providing dual rail supplies on single rail
boards with the added benefit of galvanic isolation
to reduce circuit noise.
Conditions
All output types
Min.
-40
-50
Typ.
Max.
70
130
Units
°C
30
Free air convection
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds
Internal power dissipation
Input voltage V
IN
300°C
850mW
7V
1. See derating graph.
All specifications typical at T
A
=25°C, nominal input voltage and rated output current unless otherwise specified.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
KDC_NMH0524DC.B01
Page 1 of 3
NMH0524DC
Isolated 2W Dual Output DC/DC Converter
TEMPERATURE DERATING GRAPH
3
TOLERANCE ENVELOPE
+10%
Output Power (W)
Output Voltage
2
1
0
-40
Safe Operating
Area
70°C
+1.5%
V
NOM
Typical
Load Lin
e
+2.5%
-2%
-7.5%
100
50
0
Ambient Temperature (°C)
150
10
75
50
25
Output Load Current (%)
100
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 NMH0524DC DC/DC converter is 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 NMH0524DC, 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 NMH0524DC has a toroidal isolation transformer, 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.
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
0.77 (19.50)
PIN CONNECTIONS
Pin
1
7
8
9
11
14
Function
-V
IN
NC
OV
+V
OUT
-V
OUT
+V
IN
0.39
(9.80)
NMH0524DC
XYYWWi
0.303
(7.70)
0.181 (4.60)
0.142 (3.60)
0.022 (0.55)
0.0178 (0.45)
0.1 (2.54)
0.043
(1.09)
1
0.3 (7.62)
14
0.084
(2.13)
11
0.6 (15.24)
7
9 8
0.0118 (0.30)
0.0078 (0.20)
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
www.murata-ps.com/support
KDC_NMH0524DC.B01
Page 2 of 3
NMH0524DC
Isolated 2W Dual Output DC/DC Converter
PACKAGE SPECIFICATIONS (continued)
RECOMMENDED FOOTPRINT DETAILS
0.045 (1.15)
Ø 0.039 (1.00)
5 HOLES
0.00394 (0.1)
0.1 (2.54)
0.1 (2.54)
TUBE OUTLINE DIMENSIONS
Unless otherwise stated all dimensions in inches (mm) ±0.5mm.
Tube length (14 Pin DIP) : 20.47 (520mm ±2mm).
Tube Quantity : 25
RoHS COMPLIANCE INFORMATION
The NMH0524DC 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
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/
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
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