NM485D6S5MC
Isolated RS485 Driver DC/DC
KDC_NM485D6S5MC.A01 age 4 of 11
www.murata-ps.com/support
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 NM485D6S5MC is
100% production tested at 3kVAC rms for 1 second and have been qualification tested at 3kVAC rms for 1 minute.
The NM485D6S5MC is pending recognition by Underwriters Laboratory to 250Vrms reinforced insulation.
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 NM485D6S5MC 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.
SAFETY APPROVAL
ANSI/AAMI ES60601-1
The NM485D6S5MC is pending recognition ANSI/AAMI ES60601-1 and provides 1 MOPP (Means Of Patient Protection) and 2 MOOP (Means Of Operator Protection) based upon a
working voltage of 250 Vrms max, between Primary and Secondary.
UL 60950
The NM485D6S5MC is pending recognition by Underwriters Laboratory (UL) to UL 60950 for reinforced insulation to a working voltage of 250Vrms.
FUSING
The NM485D6S5MC is 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.
NM485D6S5MC - 1A
All fuses should be UL recognized and rated to at least the maximum allowable DC input voltage.
RoHS COMPLIANCE, MSL AND PSL INFORMATION
The NM485D6S5MC is compatible with Pb-Free soldering systems and is also backward compatible with Sn/Pb soldering
systems. The NM485D6S5MC 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 Nickel Pre-plate.
