packaging to hybrid circuitry. Co-planarity of the
lead positions is based upon IEC 191-6:1990. The
devices are suitable for all applications where
high volume production is envisaged.
ABSOLUTE MAXIMUM RATINGS
Internal power dissipation
Input voltage V
IN
, NTA03 types
Input voltage V
IN
, NTA05 types
Input voltage V
IN
, NTA12 types
700mW
5.5V
7V
15V
1. If components are required in tape and reel format suffix order code code with -R, e.g. NTA0505MC-R.
2. Calculated using MIL-HDBK-217F with nominal input voltage at full load.
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_NTA.I07
Page 1 of 6
NTA Series
Isolated 1W Dual Output SM DC/DC Converters
OUTPUT CHARACTERISTICS
Parameter
Rated Power
Voltage Set Point Accuracy
Line regulation
Conditions
T
A
=-40°C to 85°C
See tolerance envelope
High V
IN
to low V
IN
10% load to rated load, 0303MC & 0503MC
10% load to rated load, 5V output types
10% load to rated load, 0309MC
10% load to rated load, 0509MC & 1209MC
10% load to rated load, 0312MC & 0315MC
10% load to rated load, 0512MC & 1212MC
10% load to rated load, 0515MC & 1215MC
BW=DC to 20MHz, 3.3V output types, NTA0305MC & NTA0505MEC
BW=DC to 20MHz, all other 5V output types
BW=DC to 20MHz, 9V output types
BW=DC to 20MHz, 12V output types
BW=DC to 20MHz, 15V output types
Min.
Typ.
Max.
1.0
Units
W
%/%
Load Regulation
1
Ripple and Noise
1.0
10
10
9.0
6.5
11
6.0
6.0
40
50
35
50
65
1.2
15
12
10
8.0
14
8.5
7.0
80
100
80
110
110
%
mV p-p
TEMPERATURE CHARACTERISTICS
Parameter
Specification
Storage
Case temperature rise above
ambient
Cooling
Conditions
All output types
0305MC, 0505MEC, 0312MC, 0315MC
0303MC, 0309MC, 0503MC
0505MC, 1205MC
All other variants
Free air convection
Min.
-40
-55
Typ.
Max.
85
125
Units
19
25
46
35
°C
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 NTA 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 NTA 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 NTA 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.
TEMPERATURE DERATING GRAPH
1.5
Output Power (W)
1.0
0.5
0
-40
85°C
Safe Operating Area
100
50
0
Ambient Temperature (°C)
150
1. 12V input types have typically 3% less load regulation change.
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KDC_NTA.I07
Page 2 of 6
NTA Series
Isolated 1W Dual Output SM DC/DC Converters
RoHS COMPLIANCE, MSL AND PSL INFORMATION
This series is compatible with RoHS soldering systems and is also backward compatible with Sn/Pb soldering systems.
The NTA series has a process, moisture, and reflow sensitivity classification of MSL1 PSL R7F as defined in J-STD-020
and J-STD-075. This translates to: MSL1 = unlimited floor life, PSL R7F = Peak reflow temperature 245°C with a
limitation on the time above liquidus (217°C) which for this series is 60sec max. The pin termination finish on this product
series is Gold with a plating thickness of 0.05 microns minimum.
For further information please visit www.murata-ps.com/rohs
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
μs
1630
1359
3435
6590
25340
1599
2185
1395
Start-up time
μs
6850
11560
15640
1154
4050
7995
11200
NTA0303MC
NTA0305MC
NTA0309MC
NTA0312MC
NTA0315MC
NTA0503MC
NTA0505MC
NTA0505MEC
NTA0509MC
NTA0512MC
NTA0515MC
NTA1205MC
NTA1209MC
NTA1212MC
NTA1215MC
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration.
1μF X7R multilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter
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
C2
than 100mΩ at 100 kHz
C3
100nF multilayer ceramic capacitor, general purpose
R1
450Ω resistor, carbon film, ±1% tolerance
R2
50Ω 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.
C1
Differential Mode Noise Test Schematic
DC/DC Converter
OSCILLOSCOPE
C1 C2 C3
+
SUPPLY
Input
R1
T1
R2
Y INPUT
+
Output
-
-
R LOAD
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KDC_NTA.I07
Page 3 of 6
NTA Series
Isolated 1W Dual Output SM DC/DC Converters
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.
+V
OUT
Power
Source
L
C
OV
C
-V
OUT
L
Load
Load
DC
DC
NTA0303MC
NTA0305MC
NTA0309MC
NTA0312MC
NTA0315MC
NTA0503MC
NTA0505MC
NTA0505MEC
NTA0509MC
NTA0512MC
NTA0515MC
NTA1205MC
NTA1209MC
NTA1212MC
NTA1215MC
L, μH
10
22
22
22
22
10
10
10
22
22
22
10
22
22
22
Inductor
SMD
82103C
82223C
82223C
82473C
82474C
82103C
82103C
82103C
82223C
82473C
82474C
82103C
82223C
82473C
82474C
Through Hole
11R103C
11R223C
11R223C
11R473C
11R474C
11R103C
11R103C
11R103C
11R223C
11R473C
11R474C
11R103C
11R223C
11R473C
11R474C
Capacitor
C, μF
4.7
2.2
2.2
1
1
4.7
4.7
4.7
2.2
1
1
4.7
2.2
1
1
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KDC_NTA.I07
Page 4 of 6
NTA Series
Isolated 1W Dual Output SM DC/DC Converters
TOLERANCE ENVELOPES
Tolerance Envelope - 3.3V output types.
+9%
All other types.
+10%
+5%
V
NOM
Typical
L
+1%
V
NOM
oad Lin
e
+1%
-7%
-15%
Typical
Load Lin
e
+2.5%
-2.5%
-7.5%
Output Voltage
-7%
Output Voltage
10
75
50
25
Output Load Current (%)
100
10
75
50
25
Output Load Current (%)
100
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.
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
15.24 [0.600]
10.16 [0.400]
PIN CONNECTIONS
Pin
DETAIL A
18
10
REFERENCE
PLANE
P
9
x10 PINS
1.50 [0.059]
1.20 [0.047]
0.2 [0.008]
S
0.50 [0.020]
Function
-V
IN
+V
IN
NA
OV
-V
OUT
NA
1
3
5
7
±5.0°
11.20
10.40
0.409
[
0.441
]
7.70 [0.303]
1
2.54 [0.100]
x10 PINS
0.75 0.030
S 0.45 0.018
NTA0505MC
K1533
9
10
0.2 [0.008]
[
]
2.79 [0.110] MAX
(1.875 [0.074] MAX)
2.10 [0.083]
0.008
[
0.012
]
12
14
16
18
+V
OUT
NA
NA
NA
6.60
(5.95)
0.260
[
(0.234)
]
(6.35)
5.85
0.230
[
(0.250)
]
x10 PINS
0.1 [0.004] S
0.25
0.10
0.004
[
0.010
]
S
SEATING PLANE
0.30
0.20
NA - Not available for electrical connection.
DETAIL A
All dimensions in mm (inches), Controlling dimension is mm.
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