converters offer a tightly regulated output voltage
in a true surface mount device, available with
three wide input voltage ranges of 4-6V, 9-15V
and 18-36V. The NTF series’ employs leadframe
technology and transfer moulding techniques to
bring all of the benefits of IC style 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.
-10
GENERAL CHARACTERISTICS
Parameter
Switching frequency
Conditions
Min.
50
Typ.
Max.
700
Units
kHz
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
Lead temperature 1.5mm from case for 10 seconds
Input voltage V
IN
, NTF05 types
Input voltage V
IN
, NTF12 types
Input voltage V
IN
, NTF24 types
15s
245°C
10V
17.5V
40V
1 Calculated using MIL-HDBK-217F with nomial input voltage at full load (ground benign) at 25ºC.
2 If components are required in tape and reel format suffix order code with -R, e.g. NTF0505MC-R.
All specifications typical at T
A
=25ºC, 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_NTF.D01
Page 1 of 8
NTF Series
Isolated 1W Wide Input DC/DC Converters
TEMPERATURE CHARACTERISTICS
Parameter
Operation
Storage
Cooling
Case temperature rise above
ambient
Conditions
See derating graphs
Free air convection
Min.
-40
-50
Typ.
Max.
85
130
Units
30
ºC
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Capacitance
Conditions
Flash tested for 1 second
Viso= 500VDC
Min.
1000
1
Typ.
10
25
Max.
Units
VDC
GΩ
pF
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 NTF 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 NTF 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 NTF 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.
www.murata-ps.com/support
KDC_NTF.D01
Page 2 of 8
NTF Series
Isolated 1W Wide Input DC/DC Converters
TEMPERATURE DERATING
NTFS0505
120
NTFS0512
120
Hi Vin
100
Hi Vin
80
Maximum load (%)
Nom Vin
100
80
Maximum load (%)
Lo Vin
60
Nom Vin
60
Lo Vin
40
40
20
20
0
-40
-20
0
20
Temperature (ºC)
40
60
80
0
-40
-20
0
20
Temperature (ºC)
40
60
80
NTFS0515
120
Hi Vin
100
Nom Vin
80
Maximum load (%)
Lo Vin
60
NTFS1205
120
100
Nom Vin
80
Maximum load (%)
Hi Vin
60
Lo Vin
40
40
20
20
0
-40
-20
0
20
Temperature (ºC)
40
60
80
0
-40
-20
0
20
Temperature (ºC)
40
60
80
NTFS1212
120
Hi Vin
NTFS1215
120
Hi Vin
100
Nom Vin
80
Maximum load (%)
Lo Vin
60
Maximum load (%)
100
Nom Vin
80
60
Lo Vin
40
40
20
20
0
-40
-20
0
20
Temperature (ºC)
40
60
80
0
-40
-20
0
20
Temperature (ºC)
40
60
80
www.murata-ps.com/support
KDC_NTF.D01
Page 3 of 8
NTF Series
Isolated 1W Wide Input DC/DC Converters
TEMPERATURE DERATING
NTFS2405
120
NTFS2412
120
Hi Vin
100
Hi Vin
80
Maximum load (%)
Nom Vin
Maximum load (%)
100
Nom Vin
80
60
Lo Vin
40
60
Lo Vin
40
20
20
0
-40
-20
0
20
Temperature (ºC)
40
60
80
0
-40
-20
0
20
Temperature (ºC)
40
60
80
NTFS2415
120
Hi Vin
100
Nom Vin
80
Maximum load (%)
60
Lo Vin
40
20
0
-40
-20
0
20
40
60
80
Temperature (ºC)
www.murata-ps.com/support
KDC_NTF.D01
Page 4 of 8
NTF Series
Isolated 1W Wide Input DC/DC Converters
MINIMUM LOAD
The graphs show the minimum load to meet datasheet specification. The NTF series will operate to zero load, however, the NTF series may not meet all datasheet
specifications.
NTFS05XX
30
NTFS12XX
30
25
Minimum Load (%)
25
Minimum Load (%)
20
12V&15V
5V
20
12V&15V
15
5V
15
10
10
5
5
0
0
4
4.2
4.4
4.6
4.8
5
5.2
Input Voltage (V)
5.4
5.6
5.8
6
9
10
11
12
13
Input Voltage (V)
14
15
NTFS24XX
50
45
40
Minimum Load (%)
35
30
25
20
15
10
5
0
18
21
24
27
Input Voltage (V)
5V
12V and 15V
30
33
36
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak reflow solder temperature of 245ºC and time above liquidus of 217ºC
for 60 seconds. The pin termination finish on this product series is Gold, plating thickness 0.05 microns minimum. The series is backward
compatible with Sn/Pb soldering systems.
For further information, please visit www.murata-ps.com/rohs
stm32/stm8
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