Datasheet

NXE1 Series
Isolated 1W Single Output SM DC/DC Converters
KDC_NXE1.E01 Page 2 of 8
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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 NXE1 series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 3kVDC for 1 second.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The NXE1 series has been recognized by Underwriters Laboratory to 125 Vrms Reinforced Insulation and 250Vrms Basic insulation, please see safety approval section below.
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 NXE1 series has a PCB embedded isolated transformer, using FR4 as an insolation barrier between primary and secondary windings. While parts
can be expected to withstand several times the stated test voltage, the isolation capability does depend on the FR4 insulation properties. Any material, including FR4 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 should be reduced by 20% from specified test voltage.
This consideration equally applies to agency recognized parts rated for better than functional isolation where the insulation is always supplemented by a further insulation system
of physical spacing or barriers.
SAFETY APPROVAL
ANSI/AAMI ES60601-1
The NXE1 series is recognised by Underwriters Laboratory (UL) to ANSI/AAMI ES60601-1 and provides 1 MOOP (Means Of Operator Protection) based upon a working
voltage of 250 Vrms max, between Primary and Secondary.
UL 60950
The NXE1 series has been recognised by Underwriters Laboratory (UL) to UL 60950 for reinforced insulation to a working voltage of 125 Vrms and for basic insulation to a working
voltage of 250Vrms.
FUSING
The NXE1 Series of converters are not internally fused so to meet the requirements of UL an anti-surge input line fuse should always be used with ratings as defined below.
Input Voltage, 3.3V: 1A
Input Voltage, 5V: 0.5A
All fuses should be UL recognized and rated to at least the maximum allowable DC input voltage.
RoHS COMPLIANCE, MSL AND PSL INFORMATION
This series is compatible with Pb-Free soldering systems and is also backward compatible with Sn/Pb soldering systems.
The NXE1 series has a process, moisture, and reflow sensitivity classification of MSL2 PSL R7F as defined in J-STD-020
and J-STD-075. This translates to: MSL2 = 1 year floor life, PSL R7F = Peak reflow temperature 245°C with a
limitation on the time above liquidus (217°C) which for this series is 90sec max. The pin termination finish on this product
series is Gold with a plating thickness of 0.12 microns.