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UEI25 Series
Single Output Isolated 25-Watt DC/DC Converters
Typical unit
Output (V)
3.3
5
12
Current (A)
7.5
5
2.1
Nominal Input (V)
48
48
48
FEATURES
Cost effective small footprint DC/DC converter,
ideal for high current applications
Industry standard 0.96" x 1.1" x 0.32" open
frame package and pinout
Input voltage range of 36-75 Vdc
3.3V, 5V, or 12Vdc fixed output voltages
Isolation up to 2250 VDC (basic)
Up to 25 Watts total output power with exten-
sive self-protection shutdown features
High efficiency synchronous rectifier forward
topology up to 91%
Stable operation with no required external
components
Usable -40 to 85°C temperature range (with
derating)
Certified to UL 60950-1, CAN/CSA-C22.2 No.
60950-1, IEC60950-1, EN60950-1 safety
approvals, 2nd edition
PRODUCT OVERVIEW
Featuring a full 25 Watt output in one square inch
of board area, the UEI25 series isolated DC/DC
converter family offers efficient regulated DC power
for printed circuit board mounting. The 0.96" x 1.1"
x 0.32" (24.4 x 27.9 x 8.1 mm) converter accepts a
2:1 input voltage range of 36 to 75 Volts DC, ideal
for telecom equipment. The industry-standard pin-
out fits larger 1" x 2" converters. The fixed output
voltage is tightly regulated. Applications include
small instruments, area-limited microcontrollers,
data communications equipment, remote sensor
systems, telephone equipment, vehicle and portable
electronics.
The UEI25 series includes full magnetic and
optical isolation with Basic protection up to 2250
Volts DC. For powering digital systems, the outputs
offer fast settling to step transients and will accept
higher capacitive loads. Excellent ripple and noise
specifications assure compatibility to noise-sus-
ceptible circuits. For systems requiring controlled
startup/shutdown, an external remote On/Off control
may use a switch, transistor or digital logic.
A wealth of self-protection features avoid both
converter and external circuit faults. These include
input undervoltage lockout and overtemperature
shutdown. The outputs current limit using the
“hiccup” autorestart technique and the outputs are
short-circuit protected. Additional features include
output overvoltage and reverse conduction elimina-
tion. The high efficiency offers minimal heat buildup
and “no fan” operation.
F1 +Vin (1)
External
DC
Power
Source
On/Off
Control
(6)
Open = On
$MPTFE0GG
1PTJUJWF
MPHJD
-Vin (2)
*TPMBUJPO
Barrier
Controller
and Power
5SBOTGFS
t4XJUDIJOH
t'JMUFST
t$VSSFOU4FOTF
Reference and
Error Amplifier
Figure 1. Connection Diagram
Typical topology is shown. Murata Power Solutions
recommends an external fuse.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
REG.-Nr. D806
+Vout (3)
Trim (4)
-Vout (5)
MDC_UEI25W.B09 Page 1 of 24

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UEI25 Series
Single Output Isolated 25-Watt DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE ➀ ➂
Output
Input
Root Models
R/N (mVp-p) Regulation (Max.)
IIN,
IOUT Total
VIN min.
VOUT (A, Power
Nom. Range load
(V) max) (W) Typ. Max. Line Load (V) (V) (mA)
IIN,
full
load
(A)
Efficiency
Min. Typ.
Package, C75
Case (inches) Case (mm)
UEI25-033-D48
3.3 7.5 25 50 80 ±0.1% ±0.2% 48 36-75 75 0.58 87.0% 89.5% 0.96x1.1x0.32 24.4x27.9x8.1
UEI25-050-D48
5 5 25 50 80 ±0.1% ±0.2% 48 36-75 30 0.57 89.0% 91% 0.96x1.1x0.32 24.4x27.9x8.1
UEI25-120-D48
12 2.1 25.2 95 120 ±0.1% ±0.1% 48 36-75 20 0.6 86.0% 87.5% 0.96x1.1x0.32 24.4x27.9x8.1
Pinout
P85
P85
P85
Notes:
Please refer to the part number structure for additional options and complete order-
ing part numbers.
Ripple and Noise is shown at 20 MHz bandwidth.
All specifications are at nominal line voltage and full load, +25 °C. unless otherwise
noted. See detailed specifications for full conditions.
Output capacitors are 1 μF ceramic in parallel with 10 μF electrolytic. The input cap
is 4.7 μF ceramic, low ESR.
I/O caps are necessary for our test equipment and may not be needed for your ap-
plication.
Minimum load is 10% for rated specifications.
PART NUMBER STRUCTURE
UEI25 - 033 - D48 P M Lx - C
Unipolar Output Isolated
25-Watt Series
RoHS-6 Hazardous Substance Compliance
(Does not claim EU RoHS exemption 7b, lead in solder)
Nominal Output Voltage
in Tenths of a Volt
Pin Length Option (through-hole only)
Blank = Std. pin length 0.25˝ (6.3mm)
L1 = 0.110˝ (2.79mm)
L2 = 0.145˝ (3.68mm)
Input Voltage Range
D48 = 36-75 Vdc
Surface Mount Option
Blank = Through-hole mount
M = Surface mount (MSL rating 2)
On/Off Control Logic:
P = Positive
N = Negative
Special quantity order is required; samples available with standard pin length only.
SMT (M) versions not available in sample quantities.
Some model number combinations may not be available. See website or contact your local Murata sales representative.
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MDC_UEI25W.B09 Page 2 of 24

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UEI25 Series
Single Output Isolated 25-Watt DC/DC Converters
FUNCTIONAL SPECIFICATIONS – MODEL UEI25-033-D48
ABSOLUTE MAXIMUM RATINGS
Conditions
Minimum
Typical/Nominal
Maximum
Units
Input Voltage, Continuous
Full power operation
0
80 Vdc
Input Voltage, Transient
Operating or non-operating, 100 mS max.
duration
0
100 Vdc
Isolation Voltage
Input to output
2250 Vdc
Input Reverse Polarity
None, install external fuse
None Vdc
On/Off Remote Control
Power on or off, referred to -Vin
0
15 Vdc
Output Power
0
25.25
W
Output Current
Current-limited, no damage, short-circuit protected
0
7.5 A
Storage Temperature Range
Vin = Zero (no power)
-55
125 ˚C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Specifications Table is not implied or recommended.
INPUT
Operating voltage range
36 48 75 Vdc
Recommended External Fuse
Fast blow
1.5 A
Start-up threshold
Rising input voltage
34 35.2 36 Vdc
Undervoltage shutdown
Falling input voltage
32 34.0 35.2 Vdc
Overvoltage shutdown
None Vdc
Reverse Polarity Protection
None, install external fuse
None Vdc
Internal Filter Type
LC
Input current
Full Load Conditions
Vin = nominal
0.58 0.60 A
Low Line
Vin = minimum
0.79 0.81 A
Inrush Transient
0.05 A2-Sec.
Output in Short Circuit
50 100 mA
No Load
Iout = minimum, unit=ON
75 100 mA
Standby Mode (Off, UV, OT)
1 2 mA
Reflected (back) ripple current
Measured at input with specified filter
30 mA, RMS
Pre-biased startup
External output voltage < Vset
Monotonic
GENERAL and SAFETY
Efficiency
Vin=48V, full load
Vin=36V, full load
87 89.5
86.5 87.5
%
%
Isolation
Isolation Voltage
Input to output, continuous
2250
Vdc
Insulation Safety Rating
basic
Isolation Resistance
10 Mohm
Isolation Capacitance
1000 pF
Safety
Certified to UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd edition
Yes
Calculated MTBF
Per MIL-HDBK-217F, ground benign,
Tambient=+30˚C
TBD Hours x 106
Calculated MTBF
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient=+40°C
2
Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
300 330 360 KHz
Startup Time
Power On to Vout regulated
50 mS
Startup Time
Remote ON to Vout regulated
50 mS
Dynamic Load Response
50-75-50% load step, settling time to within
±2% of Vout
180 250 μSec
Dynamic load di/dt
2 A/μSec
Dynamic Load Peak Deviation
same as above
±30
±100
mV
FEATURES and OPTIONS
Remote On/Off Control
"N" suffix
Negative Logic, ON state
ON = Ground pin or external voltage
-0.7
1.2 V
Negative Logic, OFF state
OFF = Pin open or external voltage
10
15 V
Control Current
1 mA
"P" suffix
Positive Logic, ON state
ON = Pin open or external voltage
10
15 V
Positive Logic, OFF state
OFF = Ground pin or external voltage
-0.7
1.2 V
Control Current
1 mA
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MDC_UEI25W.B09 Page 3 of 24

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UEI25 Series
Single Output Isolated 25-Watt DC/DC Converters
FUNCTIONAL SPECIFICATIONS (CONT.) – MODEL UEI25-033-D48
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
Output Current Range
Minimum Load
Current Limit Inception
Short Circuit
Short Circuit Current
Short Circuit Duration (remove short for
recovery)
Short circuit protection method
Regulation
Line Regulation
Load Regulation
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading (10% ceramic,
90% Oscon)
MECHANICAL (Through Hole Models)
Outline Dimensions (no baseplate)
(Please refer to outline drawing)
Weight
Conditions ➀ ➂
See Derating
No trim
At 50% load
User-adjustable
Via magnetic feedback
98% of Vnom., after warmup
Hiccup technique, autorecovery
Output shorted to ground, no damage
Current limiting
Vin=min. to max., Vout=nom., 50% load
Iout=min. to max., Vin=48V
5 Hz- 20 MHz BW
At all outputs
Cap. ESR=<0.02Ω, full resistive load
Conditions
C75 case
WxLxH
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
ENVIRONMENTAL
Operating Ambient Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
Relative humidity, non-condensing
Altitude
Nickel subplate
Gold overplate
With derating, 200 LFM
No derating, 200 LFM
Vin = Zero (no power)
Measured in center
External filter is required
To +85°C
must derate -1%/1000 feet
RoHS rating
Minimum
0.0
3.267
-1
-10
4.2
0.7575
8.5
Typical/Nominal
25.0
3.30
5
7.575
10% minimum load
10
Continuous
Maximum
25.25
3.333
+1
+10
5.7
7.575
11
0.3
Units
W
Vdc
% of Vset.
% of Vnom.
Vdc
A
% of Iout
A
A
0
Minimum
-40
-40
-55
110
10
-500
-152
50
0.02
Typical/Nominal
0.9x1.1x0.32
22.86x27.9x8.1
0.32
9.07
0.04
1.016
Copper alloy
50
5
115
B
B
RoHS-6
±0.1
±0.2
80
2000
Maximum
85
70
125
120
90
10,000
3048
% of Vout
% of Vout
mV pk-pk
% of Vnom./°C
μF
Units
Inches
mm
Ounces
Grams
Inches
mm
μ-inches
μ-inches
°C
°C
°C
°C
Class
Class
%RH
feet
meters
Notes
Unless otherwise noted, all specifications are at nominal input voltage, nominal out-
put voltage and full load. General conditions are +25˚ Celsius ambient temperature,
near sea level altitude, natural convection airflow. All models are tested and specified
with external parallel 1 μF and 10 μF multi-layer ceramic output capacitors. The ex-
ternal input capacitor is 4.7 μF ceramic. All capacitors are low-ESR types wired close
to the converter. These capacitors are necessary for our test equipment and may not
be needed in the user's application.
Input (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth.
Input filtering is Cbus=220 μF, Cin=33 μF and Lbus=12 μH.
All models are stable and regulate to specification under minimum (10%) load.
Operation under no load will not damage the converter but may increase regulation,
output ripple, and noise.
The Remote On/Off Control is referred to -Vin.
Regulation specifications describe the output voltage changes as the line voltage or
load current is varied from its nominal or midpoint value to either extreme.
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MDC_UEI25W.B09 Page 4 of 24

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UEI25 Series
Single Output Isolated 25-Watt DC/DC Converters
FUNCTIONAL SPECIFICATIONS – MODEL UEI25-050-D48
ABSOLUTE MAXIMUM RATINGS
Conditions
Minimum
Typical/Nominal
Maximum
Units
Input Voltage, Continuous
Full power operation
0
80 Vdc
Input Voltage, Transient
Operating or non-operating, 100 mS max.
duration
0
100 Vdc
Isolation Voltage
Input to output
2250 Vdc
Input Reverse Polarity
None, install external fuse
None Vdc
On/Off Remote Control
Power on or off, referred to -Vin
0
15 Vdc
Output Power
0
25.25
W
Output Current
Current-limited, no damage, short-circuit protected
0
5A
Storage Temperature Range
Vin = Zero (no power)
-55
125 ˚C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Specifications Table is not implied or recommended.
INPUT
Operating voltage range
36 48 75 Vdc
Recommended External Fuse
Fast blow
1.5 A
Start-up threshold
Rising input voltage
34 35 36 Vdc
Undervoltage shutdown
Falling input voltage
32 33.5 34.5 Vdc
Overvoltage shutdown
None Vdc
Reverse Polarity Protection
None, install external fuse
None Vdc
Internal Filter Type
LC
Input current
Full Load Conditions
Vin = nominal
0.57 0.59 A
Low Line
Vin = minimum
0.76 0.79 A
Inrush Transient
0.05 A2-Sec.
Output in Short Circuit
50 100 mA
No Load
Iout = minimum, unit=ON
30 50 mA
Standby Mode (Off, UV, OT)
1 3 mA
Reflected (back) ripple current
Measured at input with specified filter
30 mA, RMS
Pre-biased startup
External output voltage < Vset
Monotonic
GENERAL and SAFETY
Efficiency
Vin=48V, full load
Vin=36V, full load
89 91
89 91
%
%
Isolation
Isolation Voltage
Input to output, continuous
2250
Vdc
Insulation Safety Rating
basic
Isolation Resistance
10 Mohm
Isolation Capacitance
2000 pF
Safety
Certified to UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd edition
Yes
Calculated MTBF
Per MIL-HDBK-217F, ground benign,
Tambient=+30˚C
TBD Hours x 106
Calculated MTBF
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient=+40°C
2
Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
300 330 360 KHz
Startup Time
Power On to Vout regulated
50 mS
Startup Time
Remote ON to Vout regulated
50 mS
Dynamic Load Response
50-75-50% load step, settling time to within
±2% of Vout
200
μSec
Dynamic load di/dt
2 A/μSec
Dynamic Load Peak Deviation
same as above
±150
mV
FEATURES and OPTIONS
Remote On/Off Control
"N" suffix
Negative Logic, ON state
ON = Ground pin or external voltage
-0.7
0.7 V
Negative Logic, OFF state
OFF = Pin open or external voltage
10
15 V
Control Current
1 mA
"P" suffix
Positive Logic, ON state
ON = Pin open or external voltage
10
15 V
Positive Logic, OFF state
OFF = Ground pin or external voltage
-0.7
0.8 V
Control Current
1 mA
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MDC_UEI25W.B09 Page 5 of 24