MEF1 Series
Isolated 1W Regulated Single Output DC/DC Converters
KDC_MEF1.C02 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
MTTF
1
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
V
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
T
A= -40°C to 85°C
1W
Line regulation High V
IN 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
Internal power dissipation 450mW
Input voltage V
IN, MEF1S03 types 4V
Input voltage V
IN, MEF1S05 types 7V
Input voltage V
IN, MEF1S12 types 18V
Input voltage V
IN, MEF1S24 types 28V
1. Calculated using MIL-HDBK-217F with nominal input voltage at full load.
All specifications typical at T
A=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%
Power density 0.85W/cm
3
Single isolated output
UL 94V-0 package material
Footprint from 1.17cm
2
1kVDC or 3.5kVDC isolation options
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.
