The NMUSB202MC is a surface mount module which conveniently provides dual port USB data isolation
from a single upstream port with full power (500mA) available from each downstream port. Isolation
provides effective breaking of ground loops and immunity to EMI in harsh environments as found in
industrial and medical applications. Full speed (12Mbps) and low speed (1.5Mbps) are supported with
automatic switching. Input power of 5V is provided by an external ‘adapter’ or system voltage rail.
1. Components are supplied in tape and reel packaging, please refer to package specification section. Orderable part numbers are
NMUSB202MC-R7 (23 pieces per reel), or NMUSB202MC-R13 (92 pieces per reel).
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
For full details go to
www.murata-ps.com/rohs
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KDC_NMUSB202MC.C02
Page 1 of 8
NMUSB202MC
Powered Dual Port USB Data Isolator
DC-DC CHARACTERISTICS
INPUT CHARACTERISTICS
Parameter
Voltage range
Current (hub inactive)
Current (hub active) 0% load
Current 100% load
Input reflected ripple current
Conditions
Continuous operation
5V input
5V input
5V input
5V input
Min.
4.5
Typ.
5
70
110
1.3
31
Max.
5.5
Units
V
mA
mA
A
mA(rms)
OUTPUT CHARACTERISTICS
Parameter
Downstream voltages
Transient response
Settling time
40
400
μs
Conditions
5V output
Peak deviation (0-50-0% & 50-100-50% swing)
Min.
4.75
-5
Typ.
5
Max.
5.25
+3
Units
V
%V
out
MODULE CHARACTERISTICS
TEMPERATURE CHARACTERISTICS
Parameter
Operation
Storage
Product temperature rise above ambient
Conditions
See derating curve
100% Load, Nom V
IN
, Still Air (measured on transformer core)
Min.
-40
-50
Typ.
Max.
85
105
37
Units
°C
31
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Conditions
Flash tested for 1 second
Viso = 1kVDC
Min.
3000
20
Typ.
Max.
Units
VAC
GΩ
GENERAL CHARACTERISTICS
Parameter
Leakage current
Common mode transient immunity
ESD rating
Conditions
250 VAC 50Hz
Rated on model
Calculated using MIL-HDBK-217 FN2 calculation model with nominal input
voltage at full load, 25°C ambient temperature
Min.
1.31
25
Typ.
Max.
1.35
Units
μ
A
kV/ μs
V
kHrs
kHrs
2000
600
3300
MTTF
Calculated using Telecordia SR-332 calculation model with nominal input
voltage at full load, 25°C ambient temperature
ABSOLUTE MAXIMUM RATINGS
Parameter
Short-circuit protection
Input voltage
Conditions
Downstream USB 5V
Upstream USB 5V supply
Value
Continuous
5.5V
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KDC_NMUSB202MC.C02
Page 2 of 8
NMUSB202MC
Powered Dual Port USB Data Isolator
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 NMUSB202MC data isolator is 100% production tested at its stated isolation voltage. This is 3kVAC for 1 second.
The NMUSB202MC series
has been recognised by
Underwriters Laboratory to 250 Vrms 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. 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.
SAFETY APPROVAL
ANSI/AAMI ES60601-1
The NMUSB202MC is recognised to 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 NMUSB202MC series has been recognised by Underwriters Laboratory (UL) to UL 60950 for reinforced insulation to a working voltage of 250Vrms.
FUSING
The NMUSB202MC 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.
NMUSB202MC - 2.5A (125Vdc rated)
All fuses should be UL recognised and rated to at least the maximum allowable DC input voltage.
RoHS COMPLIANCE, MSL AND PSL INFORMATION
NMUSB202MC is compatible with RoHS soldering systems with a peak reflow solder temperature of 245ºC as per
J-STD-020D.1. The pin termination finish on this product series is Gold with Nickel Pre-plate. The series is backward
compatible with Sn/Pb soldering systems. The product has a Moisture Sensitivity Level (MSL) 3.
TEMPERATURE DERATING GRAPH
NMUSB202MC
6.00
5.00
Output Power (W)
4.00
Still Air
3.00
100 lfm
200 lfm
400 lfm
2.00
1.00
0.00
50
60
70
80
Temperature (°C)
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KDC_NMUSB202MC.C02
Page 3 of 8
NMUSB202MC
Powered Dual Port USB Data Isolator
EFFICIENCY GRAPH
NMUSB202MC
90
80
70
Efficiency (%)
60
50
40
30
20
10
0
10
20
30
40
50
60
70
80
90
100
Load (%)
EMC FILTERING AND SPECTRA
FILTERING
The following filter circuit and filter table shows the input filters typically required to meet EN55022 Quasi-Peak Curve A or B.
L1
C2
C1
R1
USB
ISOLATOR
C1
Ceramic capacitor
C2
Electrolytic capacitor
TO MEET CURVE B
Part Number
NMUSB202MC
C1
10μF
L1
10μH
C2
470μF
R1
0.5
Ω
NMUSB202MC
100
90
80
70
60
dBuV
50
40
30
20
10
0
1.00E+05
1.00E+06
1.00E+07
1.00E+08
Frequency (Hz)
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KDC_NMUSB202MC.C02
Page 4 of 8
NMUSB202MC
Powered Dual Port USB Data Isolator
APPLICATION NOTES
NMUSB202MC is equivalent to one USB hub for dynamic characteristics, verified by the setup in the figure below for worst case USB specification of 5 cascaded hubs.
The host PC counts as one hub.
Equipment
Tektronix DPO5034B Scope
Scope Firmware 7.2.0 Build 4
TekExpress USB2 1.0.0.65
Framework version 3.0.1.51
Tektronix TPP0500 500MHZ 300V CATII 3.9pF probes
Thurlby PL320
HP Elite Desk 800G F6X32ET~ABU
HP Compaq DC5800
Keithley 2000 DMM
Keithley 2000 DMM
Pro Signal PS11116 5M Certified USB cables
Newlink USB 4-Port Hubs
Integral “Splash Black” USB flash drive (8GB)
HP 672652-001
Logitech 810-003656
TektronixUSB test fixture TDSUSBF
Use
Signal Qualification
Power Supply for NMUSB202MC
Remote From
Remote Into
Vin Measurement
Iin Measurement
USB Cabling
USB Hubs
Full Speed Qualifier
Mouse for Port 1
Mouse for Port 2
Test Fixture
HOST PC
Full speed HUB 1
Full speed HUB 2
Full speed HUB 3
Full speed downstream
signal quality test board
Full speed HUB 4
NMUSB202MC
Full speed qualifier
attached to test board
Oscilloscope
Typical Eye Diagram:
The ‘eye’ diagram is an indication of adequate data quality after the worst case of five cascaded USB hubs.
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