MEJ2 Series
5.2kVDC Isolated 2W DC/DC Converters
KDC_MEJ2C.B01 Page 1 of 7
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SELECTION GUIDE
Order Code
Nominal Input
Voltage
Output Voltage
Output Current
Input Current
at Rated Load
Load Regulation
(Typ)
Load Regulation
(Max)
Ripple & Noise
(Typ)3
Ripple & Noise
(Max)3
Efficiency
(Min)
Efficiency
(Typ)
MTTF2
V V mA % mVp-p % kHrs
MEJ2S0303SC 3.3 3.3 606 756 14.0 17 38 55 67 70 3910
MEJ2S0305SC 3.3 5 400 784 13.0 15 50 65 70 74 3757
MEJ2S0503SC 5 3.3 606 528 10.0 15 40 55 67 70 3830
MEJ2S0505SC 5 5 400 503 8.5 10 43 55 72 75 3654
MEJ2S0509SC 5 9 222 505 8.0 11 36 50 75 78 3472
MEJ2S0512SC 5 12 167 495 8.0 12 40 55 74 77 3663
MEJ2S0515SC 5 15 133 488 7.0 10 34 45 76 79 2629
MEJ2S1203SC 12 3.3 606 207 9.5 11 43 60 70 73 3259
MEJ2S1205SC 12 5 400 214 8.0 10 43 60 75 78 3200
MEJ2S1209SC 12 9 222 205 7.0 10 35 50 75 79 2453
MEJ2S1212SC 12 12 167 207 6.5 8 35 50 76 80 2779
MEJ2S1215SC 12 15 133 205 7.0 10 32 45 76 80 2707
MEJ2S1505SC 15 5 400 171 8.5 10 44 60 73 76 2638
MEJ2S1509SC 15 9 222 165 6.5 8 35 50 74 78 2203
MEJ2S1512SC 15 12 167 164 6.5 8 38 55 74 79 2330
MEJ2S1515SC 15 15 133 166 7.0 8 36 50 74 78 2100
MEJ2D0503SC 5 ±3.3 ±303 535 8.5 10 26 40 67 71 3969
MEJ2D0505SC 5 ±5 ±200 508 7.5 9 34 50 72 76 3654
MEJ2D0509SC 5 ±9 ±111 510 6.5 8 27 40 76 79 3472
MEJ2D0512SC 5 ±12 ±83 504 5.0 8 27 40 77 80 3663
MEJ2D0515SC 5 ±15 ±67 492 6.5 7 20 35 76 79 2629
MEJ2D1203SC 12 ±3.3 ±303 205 8.0 9 37 55 72 75 3270
MEJ2D1205SC 12 ±5 ±200 212 7.0 8 32 45 75 79 3268
MEJ2D1209SC 12 ±9 ±111 206 5.5 7 27 40 77 81 2453
MEJ2D1212SC 12 ±12 ±83 208 5.5 7 27 40 77 81 2779
MEJ2D1215SC 12 ±15 ±67 203 6.0 7 24 40 78 82 2707
MEJ2D1505SC 15 ±5 ±200 170 7.0 9 37 50 74 78 2638
MEJ2D1509SC 15 ±9 ±111 163 5.5 7 26 40 76 80 2203
MEJ2D1512SC 15 ±12 ±83 167 5.5 7 26 40 75 80 2330
MEJ2D1515SC 15 ±15 ±67 167 5.5 7 23 35 75 79 2100
INPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Voltage range
Continuous operation, 3V input types 2.97 3.3 3.63
V
Continuous operation, 5V input types 4.5 5 5.5
Continuous operation, 12V input types 10.8 12 13.2
Continuous operation, 15V input types 13.5 15 16.5
Input reflected ripple
3.3V input types 100 140
mA
5V input types 60 90
12V & 15V input types 22 40
1. Calculated using MIL-HDBK-217 FN2 calculation model with nominal input voltage at full load.
2. See safety approvals section for limitations of use.
3. See ripple & noise test method.
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
FEATURES
RoHS compliant
Basic/supplementary isolation to UL 609502
UL60601 (3rd Ed) recognition2
Power density 0.81W/cm3
Single and dual outputs
UL 94V-0 package material
Footprint 1.96cm2
SIP package style
5.2kVDC isolation
3.3V, 5V, 12V & 15V inputs
3.3V, 5V, 9V, 12V & 15V output
Internal SMD construction
Fully encapsulated with toroidal magnetics
Pin compatible with the MEV, NMV, NMK, &
NMJ series
MTTF up to 4200 million hours
PRODUCT OVERVIEW
The MEJ2 series are single and dual output
medically approved DC/DC converters in a 7 pin SIP
package style offering a power upgrade path from
the NMJ series SIP DC/DC converters. The MEJ2
series is UL 60950 and UL 60601 recognized, which
makes it ideal for applications where safety and
miniaturisation are of paramount importance.
MEJ2 Series
5.2kVDC Isolated 2W DC/DC Converters
KDC_MEJ2C.B01 Page 2 of 7
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OUTPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Rated Power2TA=-40ºC to 85ºC 2W
Voltage Set Point Accuracy See tolerance envelopes
Line regulation High VIN to low VIN 1.0 1.2 %/%
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection 10 minutes
Lead temperature 1mm from case for 10 seconds 260°C
Input voltage VIN, MEJ2x03xxSC 5V
Input voltage VIN, MEJ2x05xxSC 7V
Input voltage VIN, MEJ2x12xxSC 15V
Input voltage VIN, MEJ2x15xxSC 18V
ISOLATION CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Isolation test voltage Flash tested for 1 second 5200 VDC
Resistance Viso= 500VDC 1GΩ
Isolation capacitance 4pF
GENERAL CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Switching frequency All types 45 kHz
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Specification All output types (see safety approval section for limitations) -40 85
°C
Storage -55 125
Case Temperature above ambient
MEJ2S0509SC, MEJ2S0512SC, MEJ2S0515SC, MEJ2S1209SC, MEJ2x1212SC,
MEJ2S1215SC, MEJ2S1509SC, MEJ2S1512SC, MEJ2S1515SC 27
MEJ2S0503SC, MEJ2S0505SC, MEJ2S1203SC, MEJ2S1205SC, MEJ2x1505SC,
MEJ2S1515SC, MEJ2D0512SC, MEJ2D0515SC, MEJ2D1209SC, MEJ2D1215SC 30
MEJ2S0305SC, MEJ2S0303SC, MEJ2S1203SC, MEJ2D0505SC, MEJ2D0509SC,
MEJ2D1205SC, MEJ2D1509SC, MEJ2D1512SC 33
MEJ2D01203SC, MEJ2D0503SC 37
Cooling Free air convection
TEMPERATURE DERATING GRAPH
UL60950 recognition to a maximum ambient temperature of 85ºC and/or case temperature limit of 155ºC, measured on the face opposite the pins.
85400-40
0.2
1.0
2.0
Ambient Temperature (ºC)
Output Power (W)
Safe
Operating Area
MEJ2 Series
5.2kVDC Isolated 2W DC/DC Converters
KDC_MEJ2C.B01 Page 3 of 7
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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 MEJ2 series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 5.2kVDC for 1 second.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The MEJ2 series has been recognized by Underwiters Laboratory for various voltages, 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. 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
UL 60601
The MEJ2 series has been recognized by Underwriters Laboratory (UL) to the 3rd edition of 60601 and provides the following MOOP (means of operator protection), in a maximum
ambient temperature of 85°C and/or case temperature limit of 130°C (case temperature measured on the face opposite the pins): 2 MOOP based upon a working voltage of 200
Vrms max. and 280 Vpkmax., between Primary and Secondary and 1 MOOP based upon a working voltage of 200 Vrms max., between Primary and its Enclosure. File Number
E202895 applies.
UL 60950
The MEJ2 series has been recognized by Underwriters Laboratory (UL) to UL 60950 for basic/supplementary insulation to a working voltage of 200Vrms in a maximum ambient
temperature of 85°C and/or case temperature limit of 130°C (case temperature measured on the face opposite the pins). File number E151252 applies.
FUSING
The MEJ2 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.
MEJ2x03xxxC: 2A
MEJ2x05xxxC: 2A
MEJ2x12xxxC: 750mA
MEJ2x15xxxC: 750mA
All fuses should be UL recognized 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 260ºC for 10 seconds. The pin termination finish
on this product series is Tin Plate, Hot Dipped over Matte Tin with Nickel Preplate. The series is backward compatible with Sn/Pb soldering
systems. For further information, please visit www.murata-ps.com/rohs
TOLERANCE ENVELOPE
+10%
Output Load Current (%)
Output Voltage
-7.5%
+2.5%
100
75
50
25
10
VNOM
100
75
50
25
10
-7%
+9%
Output Load Current (%)
Output Voltage
-17%
+1%
VNOM
3.3V in, 3.3V output types All other output types
The voltage tolerance envelope shows typical load regulation characteristics for this product series. The tolerance envelope is the maximum output voltage variation due to
changes in output loading.
MEJ2 Series
5.2kVDC Isolated 2W DC/DC Converters
KDC_MEJ2C.B01 Page 4 of 7
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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 double 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.
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration.
C1 1µF X7R m ultilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter
C2 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 100m at 100 kHz
C3 100nF multilayer ceramic capacitor, general purpose
R1 450 resistor, carbon film, ±1% tolerance
R2 50 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.
Differential Mode Noise Test Schematic
Start-up time Start-up time
ms ms
MEJ2S0303SC 0.89 MEJ2S1515SC 6.05
MEJ2S0305SC 1.89 MEJ2D0503SC 1.57
MEJ2S0503SC 1.08 MEJ2D0505SC 1.79
MEJ2S0505SC 2.04 MEJ2D0509SC 9.32
MEJ2S0509SC 6.5 MEJ2D0512SC 14.9
MEJ2S0512SC 8.29 MEJ2D0515SC 20.84
MEJ2S0515SC 11.4 MEJ2D1203SC 1.03
MEJ2S1203SC 0.73 MEJ2D1205SC 2.51
MEJ2S1205SC 1.61 MEJ2D1209SC 6.46
MEJ2S1209SC 4.04 MEJ2D1212SC 9.94
MEJ2S1212SC 5.51 MEJ2D1215SC 14.54
MEJ2S1215SC 7.61 MEJ2D1505SC 1.79
MEJ2S1505SC 1.33 MEJ2D1509SC 5.16
MEJ2S1509SC 3.37 MEJ2D1512SC 7.04
MEJ2S1512SC 4.47 MEJ2D1515SC 10.48
Typical Start-Up Wave Form
OSCILLOSCOPE
Y INPUT
SUPPLY
C1 C2 C3 R1 T1 R2
Input Output
DC/DC Converter
R LOAD
+
+
-
-
MEJ2 Series
5.2kVDC Isolated 2W DC/DC Converters
KDC_MEJ2C.B01 Page 5 of 7
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EFFICIENCY VS LOAD
MEJ2S03XXSC MEJ2S05XXSC
MEJ2S12XXSC MEJ2S15XXSC
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100
Efficiency (%)
Load (%)
5V
3.3V
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100
Efficiency (%)
Load (%)
5V
9V
12V
15V
3.3V
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100
Efficiency (%)
Load (%)
5V
9V
12V
15V
3.3V
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100
Efficiency (%)
Load (%)
5V
9V
12V
15V
MEJ2 Series
5.2kVDC Isolated 2W DC/DC Converters
KDC_MEJ2C.B01 Page 6 of 7
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EFFICIENCY VS LOAD
MEJ2D05XXSC MEJ2D12XXSC
MEJ2D15XXSC
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100
Efficiency (%)
Load (%)
5V
9V
12V
15V
3.3V
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100
Efficiency (%)
Load (%)
5V
9V
12V
15V
3.3V
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100
Efficiency (%)
Load (%)
5V
9V
12V
15V
MEJ2 Series
5.2kVDC Isolated 2W DC/DC Converters
KDC_MEJ2C.B01 Page 7 of 7
www.murata-ps.com/support
Murata Power Solutions, Inc. 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. © 2013 Murata Power Solutions, Inc.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS PIN CONNECTIONS
Dual Output Single Output
Pin Function Pin Function
1+VIN 1+VIN
2-VIN 2-VIN
5-VOUT 5-VOUT
6OV 7+V
OUT
7+VOUT
RECOMMENDED FOOTPRINT DETAILS
TUBE OUTLINE DIMENSIONS
Weight: 4.2g
6.00
(0.236)
5.00 (0.197)
5.20 (0.205)
1.50 (0.059)
0.6±0.15
(0.024±0.006)
14.20 (0.559)
2.54 (0.1)
x5 HOLES Ø 0.10 (0.004)
1.15 (0.045)
1.00 (0.039)
2.54 (0.1)
*
Unless otherwise stated all dimensions in inches ±0.02 (mm ±0.5mm).
Tube length : 20.669±0.079 (525mm±2mm). Tube Quantity : 25
19.65 (0.77) Max.
4.60 (0.18)
3.60 (0.14)
12.65 (0.5)
Max.
9.95
(0.39)
Max.
2.54 (0.1) 0.55 (0.022)
0.45 (0.018)
0.4 (0.016)
Min.
0.3 (0.012)
0.2 (0.008)
2.95 (0.12)
2.5±0.5 (0.098±0.02)
1256* 7
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.
* Pin not fitted on single output variants.
* Hole not required for single output variants.
All dimensions in inches ±0.01 (mm ±0.25mm).
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Murata:
MEJ2D0509SC MEJ2D1203SC MEJ2S0509SC MEJ2S1509SC MEJ2S0505SC MEJ2D0505SC MEJ2S1215SC
MEJ2S0305SC MEJ2D1512SC MEJ2S1512SC MEJ2S0303SC MEJ2S1205SC MEJ2D1205SC MEJ2D1215SC
MEJ2S0512SC MEJ2D1212SC MEJ2D1509SC MEJ2S1203SC MEJ2S1212SC MEJ2D1209SC MEJ2S0515SC
MEJ2S1505SC MEJ2D1515SC MEJ2D1505SC MEJ2S1209SC MEJ2S0503SC MEJ2S1515SC MEJ2D0512SC
MEJ2D0503SC MEJ2D0515SC
