MEF1 Series
www.murata-ps.com
Isolated 1W Regulated Single Output DC/DC Converters
SELECTION GUIDE
Order Code
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
FEATURES
MEF1S1203SPC 12 3.3 303 11 35 120 65 69 40 511
UL60950 recognised
MEF1S1205SPC 12 5 200 10 35 115 69 73.5 60 1044
MEF1S2403SPC 24 3.3 303 13 40 60 64 69 35 580
Short circuit protection
MEF1S2405SPC 24 5 200 13 40 55 68 73 45 834
Operation to zero load
3.5kVDC Isolation Part Numbers
MEF1S0303SP3C 3.3 3.3 303 11 35 460 63 66 40 495
Output regulation <1%
MEF1S0305SP3C 3.3 5 200 9 35 430 68 71 30 867
3
Power density 0.85W/cm
MEF1S0503SP3C 5 3.3 303 8 30 290 65 68.5 40 665
MEF1S0505SP3C 5 5 200 10 40 275 69 73 50 1051
Single isolated output
MEF1S1203SP3C 12 3.3 303 11 35 120 65 69 40 511
UL 94V-0 package material
MEF1S1205SP3C 12 5 200 10 35 115 69 73.5 60 1044
2
Footprint from 1.17cm MEF1S2403SP3C 24 3.3 303 13 40 60 64 69 35 580
MEF1S2405SP3C 24 5 200 13 40 55 68 73 45 834
1kVDC or 3.5kVDC isolation options
INPUT CHARACTERISTICS
3.3V, 5V, 12V & 24V input
Parameter Conditions Min. Typ. Max. Units
3.3V & 5V output
Continuous operation, 3.3V input types 3.135 3.3 3.465
SMD construction
Continuous operation, 5V input types 4.75 5 5.25
Voltage range V
Continuous operation, 12V input types 11.4 12 12.6
Fully encapsulated with toroidal magnetics
Continuous operation, 24V input types 22.8 24 25.2
Reected ripple current 5 20 mA p-p
DESCRIPTION
The MEF1 series of DC/DC converters is used
OUTPUT CHARACTERISTICS
where a tightly regulated supply is required. They
Parameter Conditions Min. Typ. Max. Units
are ideal for situations where the input voltage
3.3V Output 2.5
Voltage set point accuracy %
is not tightly controlled. The single rail regulated
5V Output 2
output makes the ideal choice to power sensors,
Rated power TA= -40C to 85C 1W
such as pressure transducers, hall effect sensors
Line regulation High VIN to low VIN 0.25 %/%
and mass airow sensors.
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 260C
Internal power dissipation 450mW
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 specications typical at TA=25C, nominal input voltage and rated output current unless otherwise specied.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
KDC_MEF1.C02 Page 1 of 7
Nominal
Input
Voltage
Output
Voltage
Output
Current
Ripple &
Noise (Typ.)
Ripple &
Noise (Max.)
Input Current
(Typ.)
Efciency
(Min.)
Efciency
(Typ.)
Isolation
Capacitance
1
MTTFMEF1 Series
Isolated 1W Regulated Single Output DC/DC Converters
ISOLATION CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
SPC Versions Flash tested for 1 second 1000
Isolation test voltage VDC
SP3C Versions Flash tested for 1 minute 3500
Resistance Viso= 1kVDC 10 G
GENERAL CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
0303 45
5V input types 50
Switching frequency kHz
12V input types & 0305 60
24V input types 75
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Specication All output types -40 85
Case temperature above ambient 40 C
Storage -50 125
Cooling Free air convection
TEMPERATURE DERATING GRAPH RoHS COMPLIANCE INFORMATION
1.5
This series is compatible with RoHS soldering
85C
systems with a peak wave solder temperature of
1.0
260C for 10 seconds. The pin termination nish
on the SIP package type is Tin Plate, Hot Dipped
over Matte Tin over Nickel Preplate. This series
Safe Operating Area
0.5
is backward compatible with Sn/Pb soldering
systems.
0
-40 100 150
0 50
Ambient Temperature (C) For further information, please visit www.murata-ps.com/rohs
www.murata-ps.com/support
KDC_MEF1.C02 Page 2 of 7
Output Power (W)