MEF1S0303SP3C - MURATA MANUFACTURING

MEF1 Series

Isolated 1W Regulated Single Output DC/DC Converters

KDC_MEF1.C03 Page 1 of 7

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SELECTION GUIDE

Order Code

Nominal

Input

Voltage

Output

Voltage

Output

Current

Ripple &

Noise (Typ.)

Ripple &

Noise (Max.)

Input Current

(Typ.)

Efﬁciency

(Min.)

Efﬁciency

(Typ.)

Isolation

Capacitance

MTTF1

V V mA mVp-p mA % % pF kHrs

MEF1S0303SPC 3.3 3.3 303 11 35 460 63 66 40 495

MEF1S0305SPC 3.3 5 200 9 35 430 68 71 30 867

MEF1S0503SPC 5 3.3 303 8 30 290 65 68.5 40 665

MEF1S0505SPC 5 5 200 10 40 275 69 73 50 1051

MEF1S1203SPC 12 3.3 303 11 35 120 65 69 40 511

MEF1S1205SPC 12 5 200 10 35 115 69 73.5 60 1044

MEF1S2403SPC 24 3.3 303 13 40 60 64 69 35 580

MEF1S2405SPC 24 5 200 13 40 55 68 73 45 834

3.5kVDC Isolation Part Numbers

MEF1S0303SP3C 3.3 3.3 303 11 35 460 63 66 40 495

MEF1S0305SP3C 3.3 5 200 9 35 430 68 71 30 867

MEF1S0503SP3C 5 3.3 303 8 30 290 65 68.5 40 665

MEF1S0505SP3C 5 5 200 10 40 275 69 73 50 1051

MEF1S1203SP3C 12 3.3 303 11 35 120 65 69 40 511

MEF1S1205SP3C 12 5 200 10 35 115 69 73.5 60 1044

MEF1S2403SP3C 24 3.3 303 13 40 60 64 69 35 580

MEF1S2405SP3C 24 5 200 13 40 55 68 73 45 834

INPUT CHARACTERISTICS

Parameter Conditions Min. Typ. Max. Units

Voltage range

Continuous operation, 3.3V input types 3.135 3.3 3.465

Continuous operation, 5V input types 4.75 5 5.25

Continuous operation, 12V input types 11.4 12 12.6

Continuous operation, 24V input types 22.8 24 25.2

Reﬂected ripple current 5 20 mA p-p

OUTPUT CHARACTERISTICS

Parameter Conditions Min. Typ. Max. Units

Voltage set point accuracy 3.3V Output ± 2.5 %

5V Output ± 2

Rated power TA= -40°C to 85°C 1W

Line regulation High VIN to low VIN 0.25 %/%

Load regulation 10% load to rated load 0.3 1 %

ABSOLUTE MAXIMUM RATINGS

Short-circuit protection Continuous

Lead temperature 1.5mm from case for 10 seconds 260°C

Input voltage VIN, MEF1S03 types 4V

Input voltage VIN, MEF1S05 types 7V

Input voltage VIN, MEF1S12 types 18V

Input voltage VIN, MEF1S24 types 28V

1. Calculated using MIL-HDBK-217F with nominal input voltage at full load.

All speciﬁcations typical at TA=25°C, nominal input voltage and rated output current unless otherwise speciﬁed.

FEATURES

UL60950 recognised

Short circuit protection

Operation to zero load

Output regulation <1%

Single isolated output

1kVDC or 3.5kVDC isolation options ‘Hi Pot

Test’

3.3V, 5V, 12V & 24V input

3.3V & 5V output

SMD construction

Fully encapsulated with toroidal magnetics

DESCRIPTION

The MEF1 series of DC/DC converters is used

where a tightly regulated supply is required. They

are ideal for situations where the input voltage

is not tightly controlled. The single rail regulated

output makes the ideal choice to power sensors,

such as pressure transducers, hall effect sensors

and mass airﬂow sensors.

MEF1 Series

Isolated 1W Regulated Single Output DC/DC Converters

KDC_MEF1.C03 Page 2 of 7

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ISOLATION CHARACTERISTICS

Parameter Conditions Min. Typ. Max. Units

Isolation test voltage SPC Versions Flash tested for 1 second 1000 VDC

SP3C Versions Flash tested for 1 minute 3500

Resistance Viso= 1kVDC 10 GΩ

GENERAL CHARACTERISTICS

Parameter Conditions Min. Typ. Max. Units

Switching frequency

0303 45

kHz

5V input types 50

12V input types & 0305 60

24V input types 75

TEMPERATURE CHARACTERISTICS

Parameter Conditions Min. Typ. Max. Units

Speciﬁcation All output types -40 85

°C

Case temperature above ambient 40

Storage -50 125

Cooling Free air convection

TEMPERATURE DERATING GRAPH 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 the SIP package type is Tin Plate, Hot Dipped

over Matte Tin over Nickel Preplate. This series

is backward compatible with Sn/Pb soldering

systems.

For further information, please visit www.murata-ps.com/rohs

150100

-40

0.5

1.0

1.5

Safe Operating Area

85°C

Ambient Temperature (°C)

Output Power (W)

MEF1 Series

Isolated 1W Regulated Single Output DC/DC Converters

KDC_MEF1.C03 Page 3 of 7

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EFFICIENCY VS LOAD

3.3V Input 5V Input

12V Input 24V Input

0 102030405060708090100

Efficiency (%)

Load (%)

MEF1S0303SPC

MEF1S0305SPC

0 102030405060708090100

Efficiency (%)

Load (%)

MEF1S1205SPC

MEF1S1203SPC

0 102030405060708090100

Efficiency (%)

Load (%)

MEF1S2405SPC

MEF1S2403SPC

0 102030405060708090100

Efficiency (%)

Load (%)

MEF1S0503SPC

MEF1S0505SPC

MEF1 Series

Isolated 1W Regulated Single Output DC/DC Converters

KDC_MEF1.C03 Page 4 of 7

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APPLICATION NOTES

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

OSCILLOSCOPE

Y INPUT

SUPPLY

C1 C2 C3 R1 T1 R2

Input Output

DC/DC Converter

R LOAD

Start-up time

µs

MEF1S0303SPC 310

MEF1S0305SPC 550

MEF1S0503SPC 225

MEF1S0505SPC 460

MEF1S1203SPC 185

MEF1S1205SPC 390

MEF1S2403SPC 160

MEF1S2405SPC 430

MEF1S0303SP3C 310

MEF1S0305SP3C 550

MEF1S0503SP3C 225

MEF1S0505SP3C 460

MEF1S1203SP3C 185

MEF1S1205SP3C 390

MEF1S2403SP3C 160

MEF1S2405SP3C 430

MEF1S0305SP3C

MEF1 Series

Isolated 1W Regulated Single Output DC/DC Converters

KDC_MEF1.C03 Page 5 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 MEF1 series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second for SPC versions and 3.5kVDC

for 1 minute for SP3C versions.

A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”

The MEF1 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 MEF1 series 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 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 MEF1 series has been recognised by Underwriters Laboratory (UL) to UL 60950 for functional insulation, ﬁle number E151252 applies. The MEF1 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.

MEF1S03xxxC: 600mA

MEF1S05xxxC: 400mA

MEF1S12xxxC: 160mA

MEF1S24xxxC: 100mA

All fuses should be UL approved and rated to at least the maximum allowable DC input voltage.

MEF1 Series

Isolated 1W Regulated Single Output DC/DC Converters

KDC_MEF1.C03 Page 6 of 7

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PACKAGE SPECIFICATIONS

MECHANICAL DIMENSIONS PIN CONNECTIONS - SPC

Pin Function

1+VIN

2-Vin

4-VOUT

6+VOUT

PIN CONNECTIONS - SP3C

Pin Function

1+VIN

2-VIN

5-VOUT

7+VOUT

Weight: 1.6g

Unless otherwise stated all dimensions in mm (inches) ±0.05mm (0.002”). Controlling dimension is mm.

All pins on a 2.54mm (0.100”) pitch and within 0.25mm (0.010”) of true position.

15.24 [0.600]

0.50 [0.020]

2.52

1.54 [0.099

0.061]

2.54 [0.100]

0.40 [0.016] MIN

1.45

1.00 [0.057

0.039 ]

10.15 [0.400] MAX

4.10±0.50 [0.161±0.020]

12 5 7

5.08 [0.200]

0.25 [0.010]

19.65 [0.774] MAX

12.70 [0.500]

0.50 [0.020]

2.52

1.54 [0.099

0.061 ]

2.54 [0.100]

0.40 [0.016] MIN

1.45

1.00 [0.057

0.039 ]

10.15 [0.400] MAX

4.10±0.50 [0.161±0.020]

6.15 [0.242] MAX

12 4 6

5.08 [0.200]

19.65 [0.774] MAX

6.15 [0.242] MAX

MEF1S0505SPC

XYYWW

MEF1S0505SP3C

XYYWW

SPC SP3C

MEF1 Series

Isolated 1W Regulated Single Output DC/DC Converters

KDC_MEF1.C03 Page 7 of 7

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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

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 (continued)

RECOMMENDED FOOTPRINT DETAILS

TUBE OUTLINE DIMENSIONS

7 Pin SIP Tube

SPC SP3C

Tube Quantity : 25

All dimensions in mm ±0.25mm (inches ±0.01).

1.15 (0.045)

1.00 (0.039)

2.54 (0.1)

4 HOLES

0.1 (0.004)

1.15 (0.045)

1.00 (0.039)

2.54 (0.1)

0.1 (0.004)

5.0 [0.197]

12.43 [0.489]

18.0 [0.709]

9.3 [0.366]

Unless otherwise speciﬁed all dimensions in mm [inches] ±0.55mm [0.022].

Tube Length : 520mm [20.472] ±2.0 [0.079].