NKE Series
Isolated Sub-Miniature 1W Single Output DC/DC Converters
KDC_NKE.K02 Page 1 of 7
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SELECTION GUIDE
Order Code
Nominal
Input
Voltage
Output
Voltage
Output
Current
Input
Current at
Rated Load
Efficiency Isolation
Capacitance MTTF1
Package
Style
V V mA mA %pF kHrs
Min. Typ.
NKE0303DC 3.3 3.3 303 400 68 72 30 1234
DIP
NKE0305DC 3.3 5 200 400 72 75 35 632
NKE0309DC 3.3 9 111 403 71 74 30 1204
NKE0312DC33.3 12 83 398 73 76 33
NKE0315DC33.3 15 66 394 74 77 35
NKE0303SC 3.3 3.3 303 400 68 72 30 1234
SIP
NKE0305SC 3.3 5 200 400 72 75 35 632
NKE0309SC 3.3 9 111 403 71 74 30 1204
NKE0503DC 5 3.3 303 270 70 74 40 619
DIP
NKE0505DC 5 5 200 289 66 69 28 2414
NKE0505DEC 5 5 200 250 75 77 34 419
NKE0509DC 5 9 111 266 72 75 29 1173
NKE0512DC 5 12 83 260 73 78 30 633
NKE0515DC 5 15 66 256 74 78 32 360
NKE0503SC 5 3.3 303 270 70 74 40 619
SIP
NKE0505SC 5 5 200 289 66 69 28 2414
NKE0505SEC 5 5 200 250 75 77 34 419
NKE0509SC 5 9 111 266 72 75 29 1173
NKE0512SC 5 12 83 260 73 78 30 633
NKE0515SC 5 15 66 256 74 78 32 360
NKE1205DC 12 5 200 117 68 72 35 620
DIP
NKE1209DC 12 9 111 107 72 78 50 488
NKE1212DC 12 12 83 105 73 79 57 360
NKE1215DC 12 15 66 103 76 81 60 252
NKE1205SC 12 5 200 117 68 72 35 620
SIP
NKE1209SC 12 9 111 107 72 78 50 488
NKE1212SC 12 12 83 105 73 79 57 360
NKE1215SC 12 15 66 103 76 81 60 252
NKE0505SEC/NKE0505DEC offers higher efficiency than NKE0505SC/NKE0505DC but over a narrower operating temperature range.
See temperature characteristics graph.
INPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Voltage range
Continuous operation, 3.3V input types 2.97 3.3 3.63
V
Continuous operation, 5V input types 4.5 5.0 5.5
Continuous operation, 12V input types 10.8 12.0 13.2
Reflected ripple current 3.3V input types 40 60 mA p-p
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds 300°C
Internal power dissipation 530mW
Input voltage VIN, NKE03 types 5.5V
Input voltage VIN, NKE05 types 7V
Input voltage VIN, NKE12 types 15V
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.
PRODUCT OVERVIEW
The NKE sub-miniature series of DC/DC Converters
is particularly suited to isolating and/or converting
DC power rails. A smaller package size, improved
efficiency, lower output ripple and 3kVDC isolation
capability through state of the art packaging and
improved technology. The galvanic isolation allows
the device to be configured to provide an isolated
negative rail in systems where only positive rails
exist. The wide temperature range guarantees
startup from –40°C and full 1 watt output at 85°C.
FEATURES
RoHS Compliant
Sub-Miniature SIP & DIP Styles
3kVDC Isolation
UL Recognised
Wide Temperature performance at full
1 Watt load, –40°C to 85°C
Increased Power Density to 2.09W/cm3
UL 94V-0 Package Material
Footprint at 0.69cm2
Industry Standard Pinout
3.3V, 5V & 12V Input
3.3V, 5V, 9V, 12V and 15V Output
Internal SMD Construction
Fully Encapsulated with Toroidal
Magnetics
MTTF up to 2.4 Million hours
Custom Solutions Available
No Electrolytic or Tantalum Capacitors
NKE Series
Isolated Sub-Miniature 1W Single Output DC/DC Converters
KDC_NKE.K02 Page 2 of 7
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OUTPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Rated Power TA=-40°C to 120°C, see derating graphs 1.0 W
Voltage Set Point Accuracy See tolerance envelope
Line regulation High VIN to low VIN 1.0 1.2 %/%
Load Regulation1
10% load to rated load, 3.3V output types & 0309 10 15
%
10% load to rated load, 5V output types 12 15
10% load to rated load, 9V output types 7.5 10
10% load to rated load, 12V output types 6.5 9.5
10% load to rated load, 15V output types 6.0 8.5
Ripple and Noise
BW=DC to 20MHz, 3.3V output types & 0305, 0505SEC, 0505DEC 40 80
mV p-p
BW=DC to 20MHz, other 5V output types 77 100
BW=DC to 20MHz, 9V output types 43 90
BW=DC to 20MHz, 12V output types 35 65
BW=DC to 20MHz, 15V output types 32 55
ISOLATION CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Isolation test voltage Flash tested for 1 second 3000 VDC
Resistance Viso= 1000VDC 10 GΩ
GENERAL CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Switching frequency All output types 115 kHz
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Specification All output types -40 85
°C
Storage -50 130
Case temperature rise above
ambient
0505D/S, 1205D/S 41
All other output types 32
Cooling Free air convection
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 NKE series of dc/dc converters are all 100% production tested at their stated isolation voltage. This is 1000V DC for 1 second.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The NKE 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 materi-
als, construction and environment. While manufactured parts can 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.
1. 12V input types have typically 3% less load regulation.
SAFETY APPROVAL
The NKE 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 E179522 applies.
NKE Series
Isolated Sub-Miniature 1W Single Output DC/DC Converters
KDC_NKE.K02 Page 3 of 7
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TOLERANCE ENVELOPES
3.3V output types. All other types.
100
75
50
25
10
-7%
+9%
Output Load Current (%)
Output Voltage
+1%
-15%
-7%
+1%
Typical Load Line
VNOM
+10%
Output Load Current (%)
Output Voltage
+5%
-7.5%
-2.5%
+2.5%
Typical Load Line
VNOM
100
75
50
25
10
TEMPERATURE DERATING GRAPHS
150100
50
0
-40
0
0.5
1.0
1.5
Safe Operating Area
85°C
Ambient Temperature (°C)
Output Power (W)
150100
50
0
-40
0
0.5
1.0
1.5
Safe Operating Area
85°C
Ambient Temperature (°C)
Output Power (W)
120°C
NKE 0303DC/SC, 0305DC/
SC, 0309DC/SC, 0503DC/SC,
0505DEC/SEC types only.
All other types.
UL recognition to a
maximum ambient
temperature of 85ºC and/
or case temperature limit of
130ºC.
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.
NKE Series
Isolated Sub-Miniature 1W Single Output DC/DC Converters
KDC_NKE.K02 Page 4 of 7
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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.
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
OSCILLOSCOPE
Y INPUT
SUPPLY
C1 C2 C3 R1 T1 R2
Input Output
DC/DC Converter
R LOAD
+
+
-
-
Typical Start-Up Wave Form
Start-up time Start-up time
µs µs
NKE0303SC 544 NKE0512SC 5040
NKE0305SC 1306 NKE0515SC 9940
NKE0309SC 5250 NKE1205SC 1671
NKE0503SC 496 NKE1209SC 2835
NKE0505SC 1075 NKE1212SC 5295
NKE0505SEC 894 NKE1215SC 8475
NKE0509SC 3140
NKE Series
Isolated Sub-Miniature 1W Single Output DC/DC Converters
KDC_NKE.K02 Page 5 of 7
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APPLICATION NOTES (continued)
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: It is required that the ESR (Equivalent Series Resistance) should be as low as possible, ceramic 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.
DC
DC
L
CLoad
Power
Source
Inductor Capacitor
L, µH SMD Through Hole C, µF
NKE0303xC 10 82103C 11R103C 4.7µF
NKE0305xC 47 82473C 11R473C 4.7µF
NKE0309xC 47 82473C 11R473C 1µF
NKE0503xC 10 82103C 11R103C 4.7µF
NKE0505xC 47 82473C 11R473C 4.7µF
NKE0505xEC 47 82473C 11R473C 4.7µF
NKE0509SC 47 82473C 11R473C 1µF
NKE0512xC 68 82683C 11R683C 0.68µF
NKE0515xC 100 82104C 11R104C 2.2µF
NKE1205xC 47 82473C 11R473C 4.7µF
NKE1209xC 47 82473C 11R473C 1µF
NKE1212xC 68 82683C 11R683C 0.47µF
NKE1215xC 100 82104C 11R104C 2.2µF
NKE Series
Isolated Sub-Miniature 1W Single Output DC/DC Converters
KDC_NKE.K02 Page 6 of 7
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PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS PIN CONNECTIONS - 8 PIN DIP
Pin Function
1-VIN
4+VIN
5+VOUT
7-VOUT
PIN CONNECTIONS - 4 PIN SIP
Pin Function
1-VIN
2+VIN
3-VOUT
4+VOUT
0.45
(11.48)
0.236
(6.00)
0.0118 (0.30)
0.0078 (0.20)
0.086±0.0197
(2.18±0.50)
0.3
(7.62)
0.049
(1.25)
0.293
(7.46) 0.022 (0.55)
0.018 (0.45)
0.181 (4.60)
0.142 (3.60) 0.1 (2.54) 0.0196±0.00196
(0.50±0.05)
XYYWW
NKE0505SC
0.212 (5.40)
0.181 (4.60)
0.142 (3.60)
0.0196±0.00196
(0.50±0.05)
0.453 (11.50)
0.386 (9.80)
XYYWW
NKE0505DC
0.0118 (0.30)
0.0078 (0.20)
0.043 (1.09)
0.0763 (1.94)
0.3 (7.62)
0.3 (7.62)
0.2 (5.08)
14
57
1 234
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: 1.09g (SIP) 1.25g (DIP)
DIP Package SIP Package
NKE Series
Isolated Sub-Miniature 1W Single Output DC/DC Converters
KDC_NKE.K02 Page 7 of 7
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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
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
8 Pin DIP Tube 4 Pin SIP Tube
8 Pin DIP Package 4 Pin SIP Package
)0-&4
Tube Quantity : 40
Unless otherwise stated all dimensions in inches (mm) ±0.5mm.
Tube length (8 Pin DIP) : 20.47 (520mm ±2mm).
Tube length (4 Pin SIP) : 20.67 (525mm ±2mm).
)0-&4
