MEU1 Series
www.murata.com
Isolated 1W Single Output DC-DC Converters
MEU1S0303ZC
MEU1S0505ZC
MEU1S1212ZC
3.3
5
12
3.3
5
12
303
200
83
11
7
5
14
9
7
27
19
15
50
45
40
385
244
100
73
78
82
MEU1S0305ZC
MEU1S0512ZC
MEU1S0515ZC
MEU1S1205ZC
3.3
5
5
12
5
12
15
5
200
83
67
200
9
8
6
5
12
10
8
7
21
17
12
21
45
40
35
45
373
239
239
100
MEU1S0309ZC
MEU1S0312ZC
MEU1S0315ZC
MEU1S0503ZC
MEU1S0509ZC
MEU1S1209ZC
MEU1S1215ZC
3.3
3.3
3.3
5
5
12
12
9
12
15
3.3
9
9
15
111
83
67
303
111
111
67
10
9
8
9
9
6
4
13
12
10
12
12
9
6
16
15
14
26
17
17
15
40
40
40
50
40
40
40
376
369
371
249
245
100
100
%
mVp-p
kHrs
76
81
86
28
34
91
3084
3354
2438
76
78
78
79
79
83
83
83
30
45
39
43
3125
3317
2600
3742
MEE1S0305SC
MEE1S0512SC
NME0515SC
MEE1S1205SC
75
77
77
74
77
80
84
79
81
81
77
81
84
87
34
40
33
29
47
71
91
3960
3343
3140
2762
2952
2732
2980
NTE0309MC
Contact Murata
Contact Murata
NTE0503MC
NTE0509MC
NTE1209MC
NTE1215MC
mA
Efficiency (Typ.)
%
Recommended
Alternative
pF
Efficiency (Min.)
MTTF1
mA
Isolation Capacitance
(Typ.)
V
Ripple & Noise (Max.)
Output Current
Input Current at Rated
Load
Output Voltage
V
Order Code
Ripple & Noise (Typ.)
Nominal Input Voltage
Load Regulation (Typ.)
Load Regulation (Max.)
SELECTION GUIDE
FEATURES
UL60950 recognised
Single isolated output
1kVDC isolation
Efficiency up to 87%
Wide temperature performance at full
1 watt load, –40°C to 85°C
Power density 2.62W/cm3
3.3V, 5V & 12V inputs
3.3V, 5V, 12V & 15V outputs
Custom solutions available
PCB mounting
Footprint reduction of over 26% from
previous generations of 1W DC-DC’s
DESCRIPTION
The MEU1 series is a new range of ultra miniature
through hole 1W DC-DC converters, available in
a ZIP style pinout. The MEU1 series offers 1W
of available output power over the industrial
temperature range of -40ºC to 85ºC. They are
ideally suited for providing local supplies on
control system boards.
With the added benefit of 1kVDC galvanic
isolation to reduce switching noise and allows
the device to be configured to provide an isolated
negative rail in systems where only positive rails
exist.
INPUT CHARACTERISTICS
Parameter
Voltage range
Reflected ripple current
Conditions
Min.
Typ.
Max.
Continuous operation, 3.3V input types
Continuous operation, 5V input types
Continuous operation, 12V input types
3.3V & 5V Input types
12V Input types
2.97
4.5
10.8
3.3
5.0
12.0
3
5
3.63
5.5
13.2
15
15
Units
V
mA p-p
OUTPUT CHARACTERISTICS
Parameter
Conditions
Rated Power
Voltage Set Point Accuracy
TA=-40°C to 85°C
See tolerance envelope
Line regulation
High VIN to low VIN
Min.
Typ.
0303
All other types
1.0
1.0
Max.
Units
1.0
W
1.25
1.2
%/%
ISOLATION CHARACTERISTICS
Parameter
Conditions
Min.
Isolation test voltage
Resistance
Flash tested for 1 second
Viso= 1000VDC
1000
10
Conditions
Min.
Typ.
Max.
Units
VDC
GΩ
GENERAL CHARACTERISTICS
Parameter
Switching frequency
For full details go to
www.murata.com/en-global/
products/power/rohs
Typ.
85
Max.
Units
kHz
1. Calculated using MIL-HDBK-217F FN2 with nominal input voltage at full load.
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
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KDC_MEU1.I01 Page 1 of 10
MEU1 Series
Isolated 1W Single Output DC-DC Converters
TEMPERATURE CHARACTERISTICS
Parameter
Conditions
Min.
Specification
Storage
All output types
-40
-50
Case Temperature above ambient
Cooling
MEU1S03
All other types
Free air convection
Typ.
Max.
Units
85
125
30
25
°C
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds
Wave Solder
Input voltage VIN, MEU1S03 types
Input voltage VIN, MEU1S05 types
Input voltage VIN, MEU1S12 types
260°C
Wave Solder profile not to exceed the profile recommended in IEC 61760-1 Section 6.1.3.
Please refer to application notes for further information.
5.5V
7V
15V
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KDC_MEU1.I01 Page 2 of 10
MEU1 Series
Isolated 1W Single Output DC-DC Converters
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 MEU1 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?”
The MEU1 has been recognised by Underwriters Laboratory for functional insulation, 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 MEU1 series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enamelled 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 recognised 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
The MEU1 series has been recognised by Underwriters Laboratory (UL) to UL 60950 for functional insulation, file number E151252 applies. The MEU1 Series of converters are not
internally fused so to meet the requirements of UL 60950 an anti-surge input line fuse should always be used with ratings as defined below.
MEU1S03xxxC: 0.50A
MEU1S05xxxC: 0.50A
MEU1S12xxxC: 0.25A
All fuses should be UL approved and rated to at least the maximum allowable DC input voltage.
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260°C for 10 seconds. Please
refer to application notes for further information. The pin termination finish is Tin Plate, Hot Dipped over Matte Tin with Nickel
Preplate. This series are backward compatible with Sn/Pb soldering systems.
For further information, please visit www.murata-ps.com/rohs
PART NUMBER STRUCTURE
MEU 1 S XX XX Z C
Series name
RoHS compliant
Power rating
Package type
S - Single
D - Dual
S - SIP
D - DIP
M - Surface mount
Z - ZIP
Input voltage
Output voltage
Output type
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KDC_MEU1.I01 Page 3 of 10
MEU1 Series
Isolated 1W Single Output DC-DC Converters
CHARACTERISATION TEST METHODS
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration.
C1
1μF X7R multilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC-DC converter
10μF tantalum capacitor, voltage rating to be a minimum of 1.5 times the output voltage of the DC-DC converter with an ESR of less
than 100mΩ at 100 kHz
C3
100nF multilayer ceramic capacitor, general purpose
R1
450Ω resistor, carbon film, ±1% tolerance
R2
50Ω BNC termination
T1
3T of the coax cable through a ferrite toroid
RLOAD
Resistive load to the maximum power rating of the DC-DC converter. Connections should be made via twisted wires
Measured values are multiplied by 10 to obtain the specified values.
C2
Differential Mode Noise Test Schematic
DC/DC Converter
OSCILLOSCOPE
C1 C2 C3
+
SUPPLY
Input
-
+
R1
T1
R2
Y INPUT
Output
-
R LOAD
APPLICATION NOTES
Minimum Load
The minimum load to meet datasheet specification is 10% of the full rated load across the specified input voltage range. Lower than 10% minimum loading will result in
an increase in output voltage, which may rise to typically 1.25 times the specified output voltage if the output load falls to less than 5%.
Capacitive loading and start up
Typical start up times for this series, with a typical input voltage rise time of 2.2μs and output capacitance of 10μF, are shown in the table below. The product
series will start into a capacitance of 47μF with an increased start time, however, the maximum recommended output capacitance is 10μF.
Start-up time
MEU1S0303ZC
MEU1S0305ZC
MEU1S0309ZC
MEU1S0312ZC
MEU1S0315ZC
MEU1S0503ZC
MEU1S0505ZC
MEU1S0509ZC
MEU1S0512ZC
MEU1S0515ZC
MEU1S1205ZC
MEU1S1209ZC
MEU1S1212ZC
MEU1S1215ZC
μs
140
280
1050
1930
2790
110
200
490
880
1400
140
240
400
600
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KDC_MEU1.I01 Page 4 of 10
MEU1 Series
Isolated 1W Single Output DC-DC Converters
TOLERANCE ENVELOPES
The voltage tolerance envelopes show typical load regulation characteristics for this product series. The tolerance envelope is the maximum output voltage variation due to
changes in output loading and set point accuracy.
MEU1S0303ZC
MEU1S0305ZC
10%
6%
6%
0.5%
-6%
10
25
50
75
Output Load Current (%)
Output Voltage
Output Voltage
11%
1%
-4.5%
100
10
25
MEU1S0309ZC
100
MEU1S0312ZC
13%
11%
4%
0%
-3.5%
10
25
75
50
Output Load Current (%)
100
Output Voltage
Output Voltage
75
50
Output Load Current (%)
5%
0.5%
-3%
10
25
50
75
100
Output Load Current (%)
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KDC_MEU1.I01 Page 5 of 10
MEU1 Series
Isolated 1W Single Output DC-DC Converters
TOLERANCE ENVELOPES (Continued)
MEU1S0503ZC
9%
9%
4%
4%
0.5%
-2.5%
Output Voltage
Output Voltage
MEU1S0315ZC
0%
-6%
10
25
50
75
10
100
25
Output Load Current (%)
50
75
100
Output Load Current (%)
MEU1S0505ZC
MEU1S0509ZC
8%
13%
1.5%
-3%
10
25
75
50
Output Load Current (%)
Output Voltage
Output Voltage
5%
5%
1.5%
-2.5%
10
100
25
MEU1S0512ZC
75
50
Output Load Current (%)
100
MEU1S0515ZC
9%
8%
0%
-3%
10
25
75
50
Output Load Current (%)
100
Output Voltage
Output Voltage
5%
2.5%
1.5%
-3%
10
25
75
50
Output Load Current (%)
100
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KDC_MEU1.I01 Page 6 of 10
MEU1 Series
Isolated 1W Single Output DC-DC Converters
TOLERANCE ENVELOPES (Continued)
MEU1S1205ZC
MEU1S1209ZC
9%
3%
1%
-2.5%
10
25
75
50
Output Load Current (%)
Output Voltage
Output Voltage
6%
1%
0.5%
-3%
10
100
25
MEU1S1212ZC
75
50
Output Load Current (%)
100
MEU1S1215ZC
8%
6%
0%
-2.5%
10
25
75
50
Output Load Current (%)
Output Voltage
Output Voltage
5%
1.5%
1%
-2.5%
10
100
25
75
50
Output Load Current (%)
100
TEMPERATURE DERATING GRAPH
Output Power (W)
1.5
1.0
0.5
0
-40
85°C
Safe Operating Area
100
50
0
Ambient Temperature (°C)
150
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KDC_MEU1.I01 Page 7 of 10
MEU1 Series
Isolated 1W Single Output DC-DC Converters
EFFICIENCY VS LOAD
3.3V Input
5V Input
90
90
80
80
70
70
MEU1S0503ZC
MEU1S0303ZC
60
60
MEU1S0505ZC
Efficiency (%)
Efficiency (%)
MEU1S0305ZC
MEU1S0309ZC
50
MEU1S0312ZC
MEU1S0315ZC
40
MEU1S0509ZC
50
MEU1S0512ZC
MEU1S0515ZC
40
30
30
20
20
10
10
0
0
0
10
20
30
40
50
60
70
80
90
100
Load (%)
0
10
20
30
40
50
60
70
80
90
100
Load (%)
12V Input
90
80
70
Efficiency (%)
60
MEU1S1205ZC
MEU1S1209ZC
50
MEU1S1212ZC
MEU1S1215ZC
40
30
20
10
0
0
10
20
30
40
50
60
70
80
90
100
Load (%)
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KDC_MEU1.I01 Page 8 of 10
MEU1 Series
Isolated 1W Single Output DC-DC Converters
PACKAGE SPECIFICATIONS
Mechanical Dimensions
Pin connection - 4 PIN ZIP
8.30 [0.327] MAX
6.10 [0.240] MAX
Pin
Function
1
2
3
4
-VIN
+VIN
-VOUT
+VOUT
7.95 [0.313] MAX
0.40 [0.016] MIN
4.10±0.25 [0
0.40 [0.016]
.161±0.010]
0.30 [0.012]
1.17±0.20 [0
.046±0.008]
2.54 [0.100]
3
2.54 [0.100]
1.61±0.10 [0
4
2
1
1.27 [0.050]
.063±0.004]
5.08 [0.200]
All dimensions in mm ±0.25mm (inches ±0.01). All pins on a 2.54 (0.1) pitch and within ± 0.25 (0.01) of true position.
Weight: 0.77g
Tube Outline Dimensions
Recommended Footprint Details
[
1.27 [0.050]
15.75 (0.62)
]
7.8 (0.307)
x 4 HOLES
0.045
Ø 1.15
1.00 Ø 0.039
1.27 [0.050]
Unless otherwise stated all dimensions in mm (inches) ±0.5mm.
Tube length (4 Pin) : 520mm ±2mm (20.47).
Tube Quantity : 60
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KDC_MEU1.I01 Page 9 of 10
MEU1 Series
Isolated 1W Single Output DC-DC Converters
DISCLAIMER
Unless otherwise stated in the datasheet, all products are designed for standard commercial and industrial applications and NOT for safety-critical and/or life-critical
applications.
Particularly for safety-critical and/or life-critical applications, i.e. applications that may directly endanger or cause the loss of life, inflict bodily harm and/or loss or severe
damage to equipment/property, and severely harm the environment, a prior explicit written approval from Murata is strictly required. Any use of Murata standard products for any safety-critical, life-critical or any related applications without any prior explicit written approval from Murata shall be deemed unauthorised use.
These applications include but are not limited to:
•
Aircraft equipment
•
Aerospace equipment
•
Undersea equipment
•
Power plant control equipment
•
Medical equipment
•
Transportation equipment ( automobiles, trains, ships, etc.)
•
Traffic signal equipment
•
Disaster prevention / crime prevention equipment
•
Data Processing equipment
Murata makes no express or implied warranty, representation, or guarantee of suitability, fitness for any particular use/purpose and/or compatibility with any application or device of the buyer, nor does Murata assume any liability whatsoever arising out of unauthorised use of any Murata product for the application of the buyer. The
suitability, fitness for any particular use/purpose and/or compatibility of Murata product with any application or device of the buyer remain to be the responsibility and
liability of the buyer.
Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards that anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause harm, and take appropriate remedial actions. Buyer will fully indemnify and hold
Murata, its affiliated companies, and its representatives harmless against any damages arising out of unauthorised use of any Murata products in any safety-critical and/
or life-critical applications.
Remark: Murata in this section refers to Murata Manufacturing Company and its affiliated companies worldwide including, but not limited to, Murata Power Solutions.
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: https://www.murata.com/en-eu/products/power/requirements
Murata Power Solutions (Milton Keynes) Ltd. makes no representation that the use of its products in the circuits described herein, or the use
of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do
not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change
without notice.
© 2022 Murata Power Solutions (Milton Keynes) Ltd.
www.murata.com
KDC_MEU1.I01 Page 10 of 10
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