NDTS Series
Isolated 3W Single Output DC-DC Converters
KDC_NDTS.F01 Page 1 of 5
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SELECTION GUIDE
Order code
Input
voltage
Rated output
voltage
Output current
Input
current
full load
Efficiency
(Min.)
Isolation
capacitance
MTTF 2
Min.
Load 1Full load
V (Nom.) V mA mA mA % pF kHrs
NDTS0503C 5 3.3 227 909 898 63 28 1658
NDTS0505C 5 5 150 600 806 71 30 1665
NDTS0512C 5 12 63 250 769 76 32 1650
NDTS1212C 12 12 63 250 310 75 35 1650
NDTS2403C 24 3.3 227 909 172 71 32 1671
NDTS2405C 24 5 150 600 156 78 32 1673
NDTS2412C 24 12 63 250 149 80 35 1650
Recommended
Alternative
NDTS0515C 5 15 50 200 757 77 33 1633 NDY0515C
NDTS1203C 12 3.3 227 909 350 71 29 1668 NCS3S1203SC
NDTS1205C 12 5 150 600 320 73 32 1665 NDY1205C
NDTS1215C 12 15 50 200 310 76 32 1633 NDY1215C
NDTS2415C 24 15 50 200 147 84 35 1617 NDY2415C
NDTS4803C 48 3.3 227 909 87 71 32 1676 NCS3S4803SC
NDTS4805C 48 5 150 600 83 75 32 1668 NDY4805C
NDTS4812C 48 12 63 250 76 80 40 1631 NCS3S4812SC
NDTS4815C 48 15 50 200 75 80 40 1600 NCS3S4815SC
INPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Voltage range
All NDTS05 types 4.5 5 9
V
All NDTS12 types 9 12 18
All NDTS24 types 18 24 36
Reflected ripple current1
All NDTS05 types 50 150
mA p-p
All NDTS12 types 30 100
All NDTS24 types 40 50
OUTPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Voltage set point accuracy With external input/output capacitors ±1 ±3 %
Line regulation Low line to high line with external input/
output capacitors 0.15 0.5 %
Load regulation
Minimum load to rated
load with external input/
output capacitors
0503, 0505 0.8 1.0
%2403, 2405 0.8 1.2
12V outputs 0.1 0.5
Ripple BW = 20Hz to 300kHz with external input/
output capacitors 15 40 mV rms
Ripple & noise BW = DC to 20MHz with external input/output
capacitors 90 150 mV p-p
1. Please refer to relected ripple current measurement circuit on page 2.
2. Calculated using MIL-HDBK-217F with nominal input voltage at full load (ground benign) at 25°C.
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
FEATURES
Industry standard footprint
Single isolated output
Short circuit protection
Operating temperature range –40°C to
+85°C
Low profile 24 pin case
2:1 Wide input range
1kVDC Isolation ‘Hi Pot Test’
5V, 12V & 24V Input
3.3V, 5V & 12V Output
Internal SMD construction
Fully encapsulated
DESCRIPTION
The NDTS series is a range of low profile DC-DC
converters offering a single regulated output over
a 2:1 input voltage range. All parts deliver 3W
output power up to 85°C without heatsinking. A
flyback oscillator design with isolated feedback
is used to give regulation over the full operating
range of 25% to 100% of full load. It is strongly
recommended that external capacitors be used
on input and output to guarantee performance
over full load and input voltage range (see
recommended filter circuit for values).
NDTS Series
Isolated 3W Single Output DC-DC Converters
KDC_NDTS.F01 Page 2 of 5
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ABSOLUTE MAXIMUM RATINGS
Short-circuit protection 8 Hours
Lead temperature 1.5mm from case for 10 seconds 300°C
Minimum output load for specification1 25% of rated output
Input voltage 05 types 10V
Input voltage 12 types 20V
Input voltage 24 types 40V
Free air space 10mm Min. around component
GENERAL CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Switching frequency 100% to 25% load, VIN Min. to Max. 70 650 kHz
ISOLATION CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Isolation voltage Flash tested for 1 second 1000 VDC
Resistance Resistance 1 GΩ
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Operation -40 85
ºC
Storage -50 125
Case temperature rise above ambient
in still air
NDTS1212C, NDTS2405C, NDTS2412C 30
NDTS0505C, NDTS0512C, NDTS2403C 40
NDTS0503C 50
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 NDTS 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 NDTS 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 NDTS series has an EI ferrite core, 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 Tin. The series is backward compatible with Sn/Pb soldering systems.
For further information, please visit www.murata-ps.com/rohs
1. Please refer to minimum load application note on page 4.
NDTS Series
Isolated 3W Single Output DC-DC Converters
KDC_NDTS.F01 Page 3 of 5
www.murata-ps.com/support
APPLICATION NOTES
Recommended Input & Output Capacitors
Although these converters will work without external capacitors, they are necessary in order to guarantee the full parametric performance over the full line and load range. All
parts have been tested and characterized using the following values and test circuit.
Input Voltage CIN Output Voltage COUT
5V, 12V 100µF, 25V (0.25 at 100kHz) 3.3V, 5V 220µF, 16V (0.12 at 100kHz)
24V 10µF, 100V (1.5 at 100kHz) 12V 100µF, 25V (0.25 at 100kHz)
Test circuit
Reflected Ripple Current Measurement
C1 = 220µF, ESR < 0.1Ω at 100kHz
NDTS COUT
CIN
- VIN
+ VIN
+ VOUT
Supply + VIN
Supply - VIN
- VOUT
NDTS
Supply + VIN
Supply - VIN
12µH
Current
Probe
C1CIN
+ VIN
- VIN
Load
+ VOUT
- VOUT
COUT
NDTS Series
Isolated 3W Single Output DC-DC Converters
KDC_NDTS.F01 Page 4 of 5
www.murata-ps.com/support
APPLICATION NOTES (continued)
Minimum Load
The minimum load for correct operation is 25% of the full rated load across the specified input voltage range. Lower loads may cause a significant increase in output ripple and
may cause the output voltage to exceed its specification transiently during power-down when the input voltage also falls below its rated minimum.
The following graphs show the typical required minimum load required for stable operation in mA verses input voltage. Some variants are not included as they do not typically
require a minimum load for stable operation: NDTD1212C.
The NDTS series will operate from a wider input range than specified in the input characteristics datasheet table with output power derating. Please contact Murata Power
Solutions for further information.
NDTS05XXC
NDTS24XXC
0
20
40
60
80
100
120
140
160
180
200
4.5 5.5 6.5 7.5 8.5 9.5 10.5 11.5
Input Voltage (V)
Minimum Load (mA)
0503
0505
0512
0
20
40
60
80
100
120
140
160
180
200
10 15 20 25 30 35 40 45
Input Voltage (V)
Minimum Load (mA)
2403
2405
2412
NDTS Series
Isolated 3W Single Output DC-DC Converters
KDC_NDTS.F01 Page 5 of 5
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. © 2017 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 PIN CONNECTIONS
Pin Function
2-VIN
3-VIN
9NA
11 NC
14 +VOUT
16 -VOUT
22 +VIN
23 +VIN
NA - Not available for
electrical connection.
NC - No internal connection.
RECOMMENDED FOOTPRINT DETAILS
TUBE OUTLINE DIMENSIONS
All dimensions in mm(inches) ±0.25(0.010”).
All pins on a 2.54(0.10”) pitch and within ±0.25(0.010”) of true position. Weight: 6.2g
All dimensions in mm (inches) ±0.5mm (0.20”).
Tube length : 520mm±2mm (20.47±0.079”).
7
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7
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7
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7
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7
065
7
065
2.54(0.1)
1.45 (0.057)
1.30 (0.051)
x8 HOLES
2.54 (0.1)
Ø
6.80±0.55 (0.268±0.022)
20.70±0.55 (0.815±0.022)
16.70±0.55 (0.657±0.022)
16.70±0.80 (0.657±0.031)
5.50±0.25 (0.217±0.010)
0.60±0.15 (0.024±0.006)
11.70±0.80 (0.461±0.031)
Tube Quantity : 15
32.26 (1.270)
14.66 (0.577)
22.86 (0.900)
5.08 (0.200)
0.73 (0.029)
7.00 (0.275)
NDTSXXXXC
XYYWW
4.70 (0.185)
2.54 (0.100)
15.25 (0.600)
0.30 (0.012)
0.20 (0.008)
5.00 (0.197)
4.00 (0.157)
0.63 (0.025)
All dimensions in mm(inches) ±0.25(0.010”). All pins on a 2.54(0.10”) pitch and within
±0.25(0.010”) of true position.
