KDC_NDTS_D02 Page 2 of 6

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NDTS Series

Isolated 3W Single Output DC/DC Converters

ABSOLUTE MAXIMUM RATINGS

Short-circuit protection

8 Hours

Lead temperature 1.5mm from case for 10 seconds

300°C

25% of rated output

Input voltage 05 types

10V

Input voltage 12 types

20V

Input voltage 24 types

40V

Input voltage 48 types

80V

Free air space

10mm Min. around component

GENERAL CHARACTERISTICS

Parameter

Conditions

Min.

Typ.

Max.

Units

Switching frequency

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

130

Case temperature rise above ambient

in still air

NDTS0515C, NDTS1205C, NDTS1212C, NDTS1215C, NDTS2405C,

NDTS2412C, NDTS2415C, NDTS4812C & NDTS4815C

30

NDTS0505C, NDTS0512C, NDTS1203C, NDTS2403C, NDTS4803C &

NDTS4805C

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