www.murata-ps.com
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
FEATURES
Industry standard eighth-brick pinout
and package
profile 0.4" height with 0.9" x 2.3"
Low
outline dimensions
to 75 Vdc input range (48V nominal)
36
isolated, 2250 Vdc (BASIC)
Fully
insulation
Outstanding thermal performance
and derating
Extensive self-protection and short
circuit features with no output reverse
conduction
On/Off control, trim and sense functions
Interleaved synchronous rectification
yields high efficiency over 90%
protected against temperature and
Fully
voltage limits
RoHS-6 or RoHS-5 compliant
Certified to UL/EN/IEC 60950-1 and
CAN/CSA C22.2 No. 60950-1, 2nd Edition
safety approvals
Typical unit
For efficient, fully isolated DC power in the smallest space, the UCE
open frame DC-DC converter series fit in industry-standard “eighth
brick” outline dimensions and mounting pins (on quarter-brick pinout).
PRODUCT OVERVIEW
Units are offered with fixed output voltages from
1.5 to 12 Volts and currents up to 30 Amps. UCEs
operate over a wide temperature range (up to +85
degrees Celsius at moderate airflow) with full rated
power. Interleaved synchronous rectifier topology
yields excellent efficiency over 90% and no reverse
output conduction.
UCEs achieve these impressive mechanical and
environmental specs while delivering excellent
electrical performance in a through-hole package.
Overall noise is typically 50 mV pk-pk (low voltage
models) with fast step response. These converters
offer tight output regulation and high stability even
with no load. The unit is fully protected against
input undervoltage, output overcurrent and short
circuit. An on-board temperature sensor shuts
down the converter if thermal limits are reached.
“Hiccup” output protection automatically restarts
the converter when the fault is removed.
A convenient remote On/Off control input enables
phased startup and shutdown in multi-voltage ap-
plications. To compensate for longer wiring and to
retain output voltage accuracy at the load, UCEs em-
ploy a Sense input to dynamically correct for ohmic
losses. A trim input may be connected to a user’s
adjustment potentiometer or trim resistors for output
voltage calibration. The UCE will tolerate substantial
capacitive loading for bypass-cap applications.
UCEs include industry-standard safety certifica-
tions and BASIC I/O insulation provides input/output
isolation to 2250V. Radiation emission testing is
performed to widely-accepted EMC standards.
SIMPLIFIED BLOCK DIAGRAM
+V
IN
(1)
+SENSE
(7)
+V
OUT
(8)
SWITCH
CONTROL
−V
OUT
(4)
–V
IN
(3)
PULSE
TRANSFORMER
PWM
CONTROLLER
OPTO
ISOLATION
INPUT UNDERVOLTAGE, INPUT
OVERVOLTAGE, AND OUTPUT
OVERVOLTAGE COMPARATORS
REFERENCE &
ERROR AMP
−SENSE
(5)
V
OUT
TRIM
(6)
REMOTE
ON/OFF
CONTROL
(2)
Typical topology is shown.
Figure 1. Simplified Block Diagram
For full details go to
www.murata-ps.com/rohs
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MDC_UCE.E03
Page 1 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
V
OUT
(V)
1.2
1.5
1.5
1.8
2.5
3.3
3.3
5
5
12
12
12
Input
Regulation (max.)
Line
Load
±0.15%
±0.3%
Model Family
UCE-1.2/25-D48
UCE-1.5/20-D48
UCE-1.5/40-D48
UCE-1.8/30-D48
UCE-2.5/20-D48
UCE-3.3/15-D48
UCE-3.3/30-D48
UCE-5/10-D48
UCE-5/20-D48
UCE-12/4.2-D48
UCE-12/8.3-D48
UCE-12/10-D48
I
OUT
(A)
25
20
40
30
20
15
30
10
20
4.2
8.3
10
Power
(W)
30
30
60
54
50
49.5
99
50
100
50.4
99.6
120
Ripple & Noise
(mVp-p)
Typ.
Max.
50
30
100
V
IN
Nom. Range
(V)
(V)
48
36-75
I
IN,
no
load
(mA)
50
45
I
IN,
full
load
(A)
0.72
1.28
1.14
1.15
2.27
1.15
2.25
1.14
2.31
2.78
Efficiency
Min.
Typ.
85%
87%
88%
86%
89%
88%
90%
86%
87%
88%
91%
90%
91%
90.5%
92.5%
92%
90%
Package
Case Pinout
C56
P32
Please contact Murata Power Solutions for further information.
Please contact Murata Power Solutions for further information.
80
±0.125%
±0.1%
±0.25%
±0.2%
48
30
150
200
300
60
±0.125%
±0.25%
50
36-75
50
60
30
50
100
C56
P32
Please refer to the model number structure for additional ordering part numbers and options.
PART NUMBER STRUCTURE
U CE
-
3.3
/
30
-
D48 N B H
Output Configuration:
Lx
-
C
RoHS Hazardous Materials compliance
C
= RoHS6 (does not claim EU RoHS exemption 7b–lead in solder), standard
Y
= RoHS5 (with lead), optional, special quantity order
Pin Length Option
(Through-hole
packages only)
Blank = Standard pin length 0.180 inches (4.6mm)
L1 = Pin length 0.110 inches (2.79mm)*
L2 = Pin length 0.145 inches (3.68mm)*
U = Unipolar/Single
Eighth-Brick Package
Nominal Output Voltage
Maximum Rated Output
Current in Amps
Input Voltage Range:
Conformal coating (optional)
Blank
= no coating, standard
H
= Coating added, optional, special quantity order
Baseplate (optional, not available on some models)
Blank
=
No baseplate
, standard
B
=
Baseplate installed
, optional, special quantity order
On/Off Control Logic
N
=
Negative logic
, standard
P
=
Positive logic
, optional
*Special quantity order is required;
no sample quantities available.
D48 = 36-75V,
48V nominal
Note: Some model combinations may not be
available. Contact Murata Power Solutions for
availability.
As of September 2017, ONLY the following part numbers will be available: UCE-5/20-D48N-C; UCE-5/20-D48NB-C.
Product Adaptations
Murata Power Solutions offers several variations of our core product family.
These products are available under scheduled quantity orders and may also
include separate manufacturing documentation from a mutually agreeable
Product Specification. Since these product adaptations largely share a common
parts list and similar specifications and test methods with their root products,
they are provided at excellent costs and delivery. Please contact Murata Power
Solutions for details.
As of this date, the following products are available:
UCE-3.3/30-D48NHL2-Y
UCE-12/4.2-D48NHL2-Y
These models are all negative On/Off logic, no baseplate, conformal coating
added, 3.68mm pin length, and RoHS-5 hazardous substance compliance (with
lead).
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MDC_UCE.E03
Page 2 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
FUNCTIONAL SPECIFICATIONS
INPUT CHARACTERISTICS
Remote On/Off Control
Under- Reflected
Start-up
voltage (back)
Internal Reverse
threshold
Output
Shut-
Ripple
Inrush
Low Line Standby Input Filter Polarity
Positive Logic Negative Logic
Min.
down Current Transient Short (V
in
=min.) Mode
Type
Protection Current “P” Model
“N” Model
(A)
Circuit
(mA)
(V)
(mA)②
A
2
sec
(A)
(mA)
Suffix
Suffix
(mA)
32
32.5
32
32
32
32
31.5
32
500
0.97
1.72
1.53
1.54
3.06
1.53
3.00
1.52
3.07
3.70
Model Family
UCE-1.5/20-D48
UCE-1.8/30-D48
UCE-2.5/20-D48
UCE-3.3/15-D48
UCE-3.3/30-D48
UCE-5/10-D48
UCE-5/20-D48
UCE-12/4.2-D48
UCE-12/8.3-D48
UCE-12/10-D48
34
L-C
1-10,
model
dependent
None, install
external fuse
1.0
34.5
34
34
10-30,
model
dependent
0.05
A
2
sec
50-150,
model
dependent
Pi
Pi
L-C
OFF=Ground
OFF=open or
pin to +1V max.
+2.5V to
+15V max.
ON=open or
+3.5 to +15V ON=Ground pin to
+0.8V max.
max.
OUTPUT CHARACTERISTICS
V
out
Accuracy
50% Load
% of V
nom
Capacitive
Loading Max. Low
ESR <0.02Ω Max. Adjustment Temperature
µF
Range
Coefficient
Remote
Ripple/
Sense
Noise
Compen- (20 MHz
Line/Load
sation bandwidth) Regulation
Current Limit
Inception
98% of Vout,
after warmup
A
24.5
36
32
24
35
15.
23 min.
5.5
12
13
Model Family
Minimum
Loading
Efficiency
UCE-1.5/20-D48
UCE-1.8/30-D48
UCE-2.5/20-D48
UCE-3.3/15-D48
UCE-3.3/30-D48
UCE-5/10-D48
UCE-5/20-D48
UCE-12/4.2-D48
UCE-12/8.3-D48
UCE-12/10-D48
10,000
±1%
–10 to
+10% of
Vnom.
±0.02% of
Vout range
per °C
No minimum
load
+10%
See ordering guide
1000
10,000
1000
ISOLATION CHARACTERISTICS
Input to Output
Min.
V
Input to
baseplate
Min.
V
Baseplate to output
Min.
V
Isolation
Resistance
MΩ
100
10
Isolation
Capacitance
pF
Model Family
UCE-1.5/20-D48
UCE-1.8/30-D48
Isolation Safety Rating
UCE-2.5/20-D48
UCE-3.3/15-D48
UCE-3.3/30-D48
2250
1500
1500
100
1000
UCE-5/10-D48
UCE-5/20-D48
UCE-12/4.2-D48
UCE-12/8.3-D48
Basic Insulation
UCE-12/10-D48
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MDC_UCE.E03
Page 3 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
FUNCTIONAL SPECIFICATIONS, CONTINUED
MISCELLANEOUS CHARACTERISTICS
Overvoltage
Protection
12
(V) Via
Operating
Storage
Thermal
Short
Relative
PCB
Temperature Protection/ Circuit magnetic Short Circuit
Protection Short Circuit
Humidity
Temperature
Range
Shutdown Current feedback
(V)
Method
Duration
16
(non-condensing)
(no derating)
(°C)
(ºC)
(A)
1.95
2.8 V. max
120
−40 to +110
−40 to +85
(model
dependent)
−55 to
+125
5
3
4.25
110
0.5
7 max.
Current
Continuous,
limiting,
output
hiccup
shorted
autorestart.
to
Remove
ground.
overload for
No dam-
recovery.
age.
Model Family
UCE-1.5/20-D48
UCE-1.8/30-D48
UCE-2.5/20-D48
UCE-3.3/15-D48
UCE-3.3/30-D48
UCE-5/10-D48
UCE-5/20-D48
UCE-12/4.2-D48
UCE-12/8.3-D48
UCE-12/10-D48
Calculated
MTBF
4
TBC
1.8 M HRS
2.4 M HRS
2.6 M HRS
2.7 M HRS
TBC
2.4 M HRS
Operating
Temperature Range
with derating
(°C)
to +85°C/85%
125
5
14.5
DYNAMIC CHARACTERISTICS
Start-up Time
Dynamic Load
Response
Remote On/
(50-75-50%
V
in
to V
out
Off to V
out
load step) to 1%
regulated
regulated
of final value,
(Max.)
(Max.)
µSec
(See note 1)
mSec
100
150
100
200
50
100
100 max.
30
50
50
50
10
50
50
15
50
10
60
50
60
50
10
50
50
10
50
10
60
50
60
200
ABSOLUTE MAXIMUM RATINGS
Input Voltage:
Continuous:
48 Volt input models
Transient (100 mSec. Max.)
48 Volt input models
On/Off Control
Input Reverse Polarity Protection
Output Overvoltage Protection
Output Current
75 Volts
100 Volts
+15 Volts
None, install external fuse.
Magnetic feedback.
See specifications.
Current-limited. Devices can
withstand sustained short circuit
without damage.
–40 to +125°C.
See soldering guidelines.
Model Family
UCE-1.5/20-D48
UCE-1.8/30-D48
UCE-2.5/20-D48
UCE-3.3/15-D48
UCE-3.3/30-D48
UCE-5/10-D48
UCE-5/20-D48
UCE-12/4.2-D48
UCE-12/8.3-D48
UCE-12/10-D48
Switching
Frequency
KHz
480
400
350
480
380
400
330
Storage Temperature
Lead Temperature
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.
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MDC_UCE.E03
Page 4 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
FUNCTIONAL SPECIFICATIONS, CONTINUED
PERFORMANCE SPECIFICATION NOTES
(1) All models are tested and specified with external 1||10 µF ceramic/tantalum output capaci-
tors and no external input capacitor. All capacitors are low ESR types. These capacitors are
necessary to accommodate our test equipment and may not be required to achieve specified
performance in your applications. All models are stable and regulate within spec under no-load
conditions.
General conditions for Specifications are +25 deg.C, V
in
= nominal, V
out
= nominal, full load.
Adequate airflow must be supplied for extended testing under power.
(2) Input Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering
is C
in
= 33 µF, 100V tantalum, C
bus
= 220 µF, 100V electrolytic, L
bus
= 12 µH.
(3) Note that Maximum Power Derating curves indicate an average current at nominal input
voltage. At higher temperatures and/or lower airflow, the DC-DC converter will tolerate brief
full current outputs if the total RMS current over time does not exceed the Derating curve. All
Derating curves are presented at sea level altitude. Be aware of reduced power dissipation
with increasing density altitude.
(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case
3, ground fixed conditions, Tpcboard=+25 deg.C, full output load, natural air convection.
(5) The On/Off Control is normally controlled by a switch. But it may also be driven with exter-
nal logic or by applying appropriate external voltages which are referenced to Input Common.
The On/Off Control Input should use either an open collector or open drain transistor.
(6) Short circuit shutdown begins when the output voltage degrades approximately 2% from
the selected setting.
(7) The outputs are not intended to sink appreciable reverse current. This may damage the
outputs.
(8) Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise
Reduction.
(9) All models are fully operational and meet published specifications, including “cold start” at
–40ºC.
(10) Regulation specifications describe the deviation as the line input voltage or output load
current is varied from a nominal midpoint value to either extreme.
(11) Alternate pin length and/or other output voltages are available under special quantity order.
(12) Output overvoltage is non-latching. When the overvoltage fault is removed, the converter
will immediately recover.
(13) Do not exceed maximum power specifications when adjusting the output trim.
(14) At zero output current, the output may contain low frequency components which exceed
the ripple specification. The output may be operated indefinitely with no load.
(15) If reverse polarity is accidentally applied to the input, a body diode will become forward bi-
ased and will conduct considerable current. To ensure reverse input protection with full output
load, always connect an external input fuse in series with the +V
in
input.
PHYSICAL CHARACTERISTICS
Outline dimensions
Pin material
Pin diameter
Pin finish
UCE-1.5/20-D48
UCE-1.8/30-D48,
UCE-2.5/20-D48
UCE-5/10-D48
UCE-5/20-D48
UCE-12/4.2-D48
UCE-3.3/15-D48
UCE-3.3/30-D48, UCE-12/8.3-D48, UCE-12/10-D48
See mechanical specs (below)
Copper alloy
0.04/0.062" (1.016/1.524mm)
Nickel underplate with gold overplate
0.67 ounces (19 grams)
Weight
0.71 ounces (20 grams)
1 ounce (28 grams)
0.81 ounces (23 grams)
Meets EN55022/CISPR22 (requires external filter)
Certified to UL/cUL 60950-1, CSA-C22.2 No. 60950-1, IEC/EN 60950-1, 2nd Edition
Electromagnetic interference (external filter required)
Safety
SOLDERING GUIDELINES
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceed-
ing these specifications may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with
your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature
115ºC.
Maximum Pot Temperature
270ºC.
Maximum Solder Dwell Time
7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature
105ºC.
Maximum Pot Temperature
250ºC.
Maximum Solder Dwell Time
6 seconds
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MDC_UCE.E03
Page 5 of 17
