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UWR Series
www.murata-ps.com
Single Output, High Reliability, 2" x 2", 14-20 Watt, DC/DC Converters
Typical units
FEATURES
PRODUCT OVERVIEW

Low cost! Highly reliable!

Proven SMT-on-pcb construction

Designed to meet UL/ EN60950,
BASIC insulation (D48A models)

 mark available (48VIN models)

Output voltages: 3.3/5/5.2/12/15 Volts

Ultra-wide input voltage ranges:4.7-7.5V, 9-36V
or 18-75V

Small packages, 2" x 2" x 0.45"

Industry-standard pinouts

Fully isolated, 1500Vdc guaranteed

Guaranteed efficiencies to 84%

–40 to +100°C operating temperature

Modifications and customs for OEM’s
Murata Power Solutions' new A-Series switching DC/DC converters are designed to meet the
demanding long-term-reliability and low-cost requirements of modern telecom, datacom, computer/
networking and industrial-electronics applications. These highly-efficient, rugged devices combine
straightforward circuit topologies, new components, proven SMT-on-pcb construction methods, and
highly repeatable automatic-assembly techniques. The flexibility of the designs and their assembly
methods readily permit minor modifications to optimize performance for specific applications.
The single-output, 14-20 Watt Models of the A-Series deliver both high power densities and
impressive MTBF’s.
Packaged in standard, 2" x 2" x 0.45", shielded metal cases with non-conductive coatings, these
fully isolated (1500Vdc minimum) DC/DC’s offer excellent line/load regulation, full I/O protection,
thermal shutdown, and industry-standard pinouts.
Output voltages include 3.3, 5, 5.2, 12 or 15 Volts. Input voltage ranges are Murata Power Solutions' traditional ultra-wide 9-36V and 18-75V, as well as 4.7-7.5V. Each device provides remote on/
off control and VOUT trim capability. All A-Series UWR models are fully EMI characterized and designed
to meet UL1950, CSA 950 and IEC 950 safety.
A-Series DC/DC’s are extremely reliable, easy-to-use, cost-effective power converters. Use them
to improve the reliability of existing equipment or to develop
new systems that exceed design objectives.
+VOUT
(6)
+VIN
(1)
COMMON
(7)
–VIN
(2)
ON/OFF
CONTROL
(4)
PWM
CONTROLLER
OPTO
ISOLATION
Figure 1. Simplified Schematic
REFERENCE &
ERROR AMP
+VOUT
TRIM
(8)
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
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MDC_UWR14-20 Series.G01 Page 1 of 6
UWR Series
Single Output, High Reliability, 2" x 2", 14-20 Watt, DC/DC Converters
➀
Performance Specifications and Ordering Guide
Output
Input
Range
(Volts)
IIN ➃
(mA)
Min.
Typ.
Package
(Case,
Pinout)
5
4.7-7.5
80/3720
76%
77%
C4, P6
±1.0%
24
9-36
35/852
77%
79%
C4, P6
±1.0%
±1.0%
48
18-75
15/425
77.5%
78.5%
C4, P6
100
±1.0%
±1.0%
5
4.7-7.5
80/3800
78%
79%
C4, P6
100
±0.3%
±0.5%
24
9-36
15/1020
81%
82%
C4, P6
50
100
±0.3%
±0.5%
48
18-75
15/496
82%
84%
C4, P6
4000
50
100
±0.3%
±0.5%
48
36-72
15/484
84%
86%
C4, P6
5.2
3000
50
100
±1.0%
±1.0%
5
4.7-7.5
80/3900
79%
80%
C4, P6
UWR-12/1250-D5A-C
12
1250
75
120
±1.0%
±1.0%
5
4.7-7.5
80/3660
80%
82%
C4, P6
UWR-12/1650-D12A-C
12
1650
50
100
±0.3%
±0.5%
24
9-36
15/982
82%
84%
C4, P6
UWR-12/1650-D48A-C
12
1650
75
100
±0.3%
±0.5%
48
18-75
15/491
84%
85%
C4, P6
UWR-15/1000-D5A-C
15
1000
75
150
±1.0%
±1.0%
5
4.7-7.5
80/3660
80%
82%
C4, P6
UWR-15/1300-D12A-C
15
1300
50
100
±0.3%
±0.5%
24
9-36
20/967
84%
85%
C4, P6
UWR-15/1300-D48A-C
15
1300
75
100
±0.3%
±0.5%
48
18-75
10/484
84%
86%
C4, P6
VOUT
(Volts)
IOUT
(mA)
R/N (mVp-p) ➁
Typ.
Max.
Regulation (Max.)
Line
Load ➂
UWR-3.3/4250-D5A-C
3.3
4250
50
100
±1.0%
±1.0%
UWR-3.3/4850-D12A-C
3.3
4850
50
75
±0.5%
UWR-3.3/4850-D48A-C
3.3
4850
50
100
UWR-5/3000-D5A-C
5
3000
50
UWR-5/4000-D12A-C
5
4000
50
UWR-5/4000-D48A-C
5
4000
UWR-5/4000-D48E-C➄
5
UWR-5.2/3000-D5A-C
Root Model ➅
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions unless otherwise
noted.
➁ Ripple/Noise (R/N) measured over a 20MHz bandwidth.
➂ 10% to 100% load.
VIN Nom.
(Volts)
Efficiency
➃ Nominal line voltage, no-load/full-load conditions.
➄ See Technical Notes for an explanation of trading off input voltage ranges for higher full-power
operating temperature.
➅ These are not complete part numbers. Please see the Part Number Structure.
Part Number Structure
Mechanical Specifications
U WR - 5 / 4000 - D12 A - C
2.00
(50.80)
RoHS-6 hazardous substance compliant*
A-Series
High Reliability
Output Configuration:
U = Unipolar
Wide Range Input
Case C4
Input Voltage Range:
D5 = 4.7-7.5 Volts (5V nominal)
D12 = 9-36 Volts (24V nominal)
D48 = 18-75/36-72 Volts (48V nominal)
Nominal Output Voltage:
3.3, 5, 12 or 15 Volts
Maximum Output Current
in mA
METAL CASE
0.45
(11.43)
INSULATED BASE
0.040 ±0.002 DIA.
(1.016 ±0.051)
0.20 MIN
(5.08)
1.800
(45.72)
0.10
(2.54)
* Contact Murata Power Solutions
for availability.
Temperature Derating
5
0.200
(5.08)
20
6
G
BB
18
1
2
16
D
Output Power (Watts)
E
C
0.400
(10.16)
BB, G
D, E, F
7
3
1.200
(30.48)
3 EQ. SP. @
0.400 (10.16)
2.00
(50.80)
4
F
14
8
A
12
AA
UWR-3.3/4250-D5A
UWR-3.3/4850-D12A
UWR-3.3/4850-D48A
UWR-5/3000-D5A
UWR-5/4000-D12A
UWR-5/4000-D48A
UWR-5/4000-D48E
UWR-5.2/3000-D5A
UWR-12/1250-D5A
UWR-12/1650-D12A
UWR-12/1650-D48A
UWR-15/1000-D5A
UWR-15/1300-D12A
UWR-15/1300-D48A
10
8
6
4
2
0.100
(2.54)
B
F
A
A
E
C
B
G
D
E
C
B
E
C
B
BOTTOM VIEW
I/O Connections
0
–40
0
40
45
50
0.40
(10.16)
55
60
65
70
75
80
85
90
95
100
Ambient Temperature (°C)
1. UWR-3.3/4850-D48A (18-75V input, curve A) and UWR-3.3/4850-D12A (9-36V input, curve A)
will derate curve AA if used over the limited input ranges of 20-60V or 10-30V, respectively.
2. "D48A" models (18-75V input ranges) that derate along curve B will derate along curve BB
if used over the more limited input range of 24-60V.
Pin
1
2
3
4
5
6
7
8
Function P6
+Input
–Input
Pin not installed
On/Off Control
Pin not installed
+Output
Common
Trim
Notes:
For "D5A" and "D12A" models, the
case is connected to pin 2 (–VIN).
For "D48A" and "D48E" models, the
case is connected to pin 1 (+VIN).
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
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MDC_UWR14-20 Series.G01 Page 2 of 6
UWR Series
Single Output, High Reliability, 2" x 2", 14-20 Watt, DC/DC Converters
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted. ➀
Input
Absolute Maximum Ratings
Input Voltage Range:
D5A Models
D12A Models
D48A/D48E Models
4.7-7.5 Volts (5V nominal)
9-36 Volts (24V nominal)
18-75/36-72 Volts (48V nominal)
Input Current
See Ordering Guide
Input Filter Type
Pi (C-type for D5A models)
Overvoltage Shutdown:
D5A Models
D12A Models
D48A and /D48E Models
10 Volts
40 Volts
80 Volts
Reverse-Polarity Protection
Yes (Instantaneous, 10A maximum)
Output Overvoltage Protection:
3.3V Outputs
5V/5.2V Outputs
12V Outputs
15V Outputs
On/Off (Sync.) Control (Pin 4)➁
TTL high = off, low (or open) = on
Output Current
Input Voltage:
"D5A" Models
"D12A" Models
"D48A" and "D48E" Models
Input Reverse-Polarity Protection
11 Volts
44 Volts
88 Volts
Current must be <10A. Brief
duration only. Fusing recommended.
No protection
6.8 Volts, limited duration
15 Volts, limited duration
18 Volts, limited duration
Current limited. Max. current and
short-circuit duration are model
dependent
Output
VOUT Accuracy (50% load)
±1%, maximum
Storage Temperature
–40 to +105°C
Temperature Coefficient
±0.02% per °C
Lead Temperature
See soldering guidelines
Ripple/Noise (20MHz BW)
See Ordering Guide
Line/Load Regulation
See Ordering Guide
Efficiency
See Ordering Guide
Isolation Voltage ➂
1500Vdc guaranteed
Isolation Capacitance
550pF
Current Limiting
Auto-recovery
Overvoltage Protection
Zener/transorb clamp, magnetic feedback
Dynamic Characteristics
Transient Response (50% load step)
200µsec max. to ±1.5% of final value
Switching Frequency
165kHz (±15kHz)
Environmental
Operating Temperature (Ambient):
Without Derating
With Derating
–40 to +40/50/55/65°C (Model dependent)
to +100°C (See Derating Curves)
Storage Temperature
-40 to +105°C
Flammability
UL94V-0
Physical
Dimensions
2" x 2" x 0.45" (51 x 51 x 11.4mm)
Shielding
5-sided
Case Connection:
D5A, D12A Models
D48A, D48E Models
Pin 2 (–VIN)
Pin 1 (+VIN)
Case Material
Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
Pin Material
RoHS: Gold-plated copper alloy
Non-RoHS: Tin over copper alloy
Weight
2.7 ounces (76.5 grams)
➀ These converters require a minimum 10% loading to maintain specified regulation. Operation
under no-load conditions will not damage these devices; however they may not meet all listed
specifications.
➁ Applying a voltage to the Control pin when no input power is applied to the converter can
cause permanent damage to the converter. TTL Logic High of +3.3V to +5V max will disable
the converter.
➂ "D48A" models have BASIC, all other models have Functional insulation. Devices can be
screened or modified for higher guaranteed isolation voltages. Contact Murata Power Solutions Applications Engineering for details.
These are stress ratings. Exposure of devices in excess 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.
TECHNICAL NOTES
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "floating."
Users may ground either the Common (pin 7) for normal usage or the positive side (+Output, pin 6) to effectively reverse the output polarity.
Filtering and Noise Reduction
All A-Series UWR 14-20 Watt DC/DC Converters achieve their rated ripple
and noise specifications without the use of external input/output capacitors. In critical applications, input/output noise may be further reduced by
installing electrolytic capacitors across the input terminals and/or low-ESR
tantalum or electrolytic capacitors across the output terminals. The caps
should be located as close to the power converters as possible. Typical
values are listed below. In many applications, using values greater than
those listed will yield better results.
To Reduce Input Ripple
D5A Models
D12A Models
D48A Models
47µF, 16V
20µF, 50V
20-50µF, 100V
To Reduce Output Ripple
3.3V Outputs
5V/5.2V Outputs
12/15V Outputs
100µF, 6V, Low ESR
47µF, 10V, Low ESR
22µF, 20V, Low ESR
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MDC_UWR14-20 Series.G01 Page 3 of 6
UWR Series
Single Output, High Reliability, 2" x 2", 14-20 Watt, DC/DC Converters
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. For Murata Power
Solutions A-Series UWR 14-20 Watt DC/DC Converters, you should use
slow-blow type fuses
with values no greater than the following:
VIN Range
D5A
D12A
D48A/D48E
Fuse Value
6A
4A
2A
On/Off Control
+VOUT
1
+VIN
TRIM
2
6
8
20kΩ
5-10
TURNS
LOAD
–VIN
The On/Off Control pin (pin 4) may be used for remote on/off operation. A
TTL logic high (+2 to +5 Volts, 250µA max.) applied to pin 4 disables the
converter. A TTL logic low (0 to +0.8 Volts, 70µA max.), or no connection,
enables the converter. Control voltages should be referenced to pin 2
(–Input). Applying a voltage to the Control pin when no input power is
applied to the converter can cause permanent damage to the converter.
COMMON
7
Figure 2a. Trim Connections Using a Trimpot
Output Trimming
VOUT may be trimmed up +5% only via a single external trimpot or fixed
resistor. The trimpot should be connected as shown in Figure 2a with its
wiper connected to pin 8 (Trim). A trimpot can be used to determine the
value of a single fixed resistor which should be connected as shown in
Figure 2b. Connect the resistor between pins 8 and 7 (Common) to trim
"up" the output voltage. Fixed resistors should be metal-film types with
absolute TCR’s less than 100ppm/°C to ensure stability.
+VOUT
1
+VIN
TRIM
2
6
8
–VIN
LOAD
Trim Up
COMMON
7
Custom Capabilities
Murata Power Solutions' world-class design, development and manufacturing team stands ready to work with you to deliver the exact power
converter you need for your demanding, large volume, OEM applications.
More importantly . . . we’ll do it on time and within budget!
Our experienced applications and design staffs; quick-turn prototype
capability; highly automated, SMT assembly facilities; and in-line SPC
quality-control techniques combine to give us the unique ability to design
and deliver any quantity of power converters to the highest standards of
quality and reliability.
We have compiled a large library of DC/DC designs that are currently used
in a variety of telecom, medical, computer, railway, aerospace and industrial
applications. We may already have the converter you need.
Contact us. Our goal is to provide you the highest-quality, most cost-effective power converters available.
Figure 2b. Trim Connections Using Fixed Resistors
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these
converters. These specifications vary depending on the solder type. Exceeding 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
115° C.
Maximum Pot Temperature
270° C.
Maximum Solder Dwell Time
7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature
105° C.
Maximum Pot Temperature
250° C.
Maximum Solder Dwell Time
6 seconds
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MDC_UWR14-20 Series.G01 Page 4 of 6
UWR Series
Single Output, High Reliability, 2" x 2", 14-20 Watt, DC/DC Converters
Typical Performance Curves (TA = +25°C)
EMI RADIATED EMISSIONS
The performance curves below were derived from actual test data for a
single model number (UWR-5/4000-D12A). Since all devices in the 14-20W
UWR A-Series have the same circuit topology, the performance curves are
representative of all devices.
EFFICIENCY
Efficiency vs. Output Current and Input Voltage
If you’re designing with EMC in mind, please note that all of Murata Power
Solutions' UWR 14-20 Watt A-Series DC/DC Converters have been characterized for radiated and conducted emissions in our new EMI/EMC laboratory. Testing is conducted in an EMCO 5305 GTEM test cell utilizing EMCO
automated EMC test software. Radiated emissions are tested to the limits of
FCC Part 15, Class B and CISPR 22 (EN 55022), Class B. Radiated emissions
plots to FCC and CISPR 22 for model UWR-5/4000-D12A appear below.
87
84
Efficiency (%)
81
UWR-5/4000-D12A Radiated Emissions
FCC Part 15 Class B, 3 Meters
Converter Output = 5Vdc @ 3.6A
78
VIN = 12V
75
80
VIN = 24V
72
70
VIN = 36V
69
66
63
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
5V Output Current (Amps)
LINE REGULATION
Output Voltage vs. Input Voltage and Output Current
Radiated Emissions (dBμV/M)
60
FCC Class B Limit
50
40
30
20
10
0
5.015
Radiated Emissions
–10
IOUT = 1A
5.010
–20
1000
100
VOUT (Volts)
5.005
Frequency (MHz)
UWR-5/4000-D12A Radiated Emissions
EN 55022 Class B, 10 Meters
Converter Output = +5Vdc @ 3.6A
5.000
IOUT = 2A
4.995
80
4.990
70
4.985
IOUT = 4A
4.975
9
12
15
18
21
24
27
30
33
36
VIN (Volts)
LOAD REGULATION
Output Voltage vs. Output Current and Input Voltage
5.015
Radiated Emissions (dBμV/M)
60
4.980
50
EN 55022 Class B Limit
40
30
20
10
0
VIN = 12V
Radiated Emissions
–10
5.010
–20
VOUT (Volts)
5.005
1000
100
Frequency (MHz)
5.000
4.995
4.990
VIN = 36V
Quality and Reliability
VIN = 24V
4.985
4.980
4.975
0.5
1.0
1.5
2.0
2.5
3.0
5V Output Current (Amps)
3.5
4.0
The A-Series are the first DC/DC Converters to emerge from Murata Power
Solutions' new, company-wide approach to designing and manufacturing
the most reliable power converters available. The five-pronged program
draws our Quality Assurance function into all aspects of new-product
design, development, characterization, qualification and manufacturing.
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MDC_UWR14-20 Series.G01 Page 5 of 6
UWR Series
Single Output, High Reliability, 2" x 2", 14-20 Watt, DC/DC Converters
Design for Reliability
Design for Reliability is woven throughout our multi-phased, new-productdevelopment process. Design-for-reliability practices are fully documented
and begin early in the new-product development cycle with the following
goals:
1. To work from an approved components/vendors list ensuring the use of
reliable components and the rigorous qualification of new components.
2. To design with safety margins by adhering to a strict set of derating
guidelines and performing theoretical worst-case analyses.
3. To locate potential design weaknesses early in the product-development
cycle by using extensive HALT (Highly Accelerated Life Testing).
4. To prove that early design improvements are effective by employing a
thorough FRACA (Failure Reporting Analysis and Corrective Action)
system.
HALT Testing
Qualification
For each new product, electrical performance is verified via a comprehensive
characterization process and long-term reliability is confirmed via a rigorous
qualification procedure. The qual procedure includes such strenuous tests as
thermal shock and 500 hour life. Qual testing is summarized below.
Qualification Testing
The goal of the accelerated-stress techniques used by Murata Power
Solutions is to force device maturity, in a short period of time, by exposing
devices to excessive levels of "every stimulus of potential value." We use
HALT (Highly Accelerated Life Testing) repeatedly during the design and
early manufacturing phases to detect potential electrical and mechanical
design weaknesses that could result in possible future field failures.
During HALT, prototype and pre-production DC/DC converters are subjected to progressively higher stress levels induced by thermal cycling,
rate of temperature change, vibration, power cycling, product-specific
stresses (such as dc voltage variation) and combined environments. The
stresses are not meant to simulate field environments but to expose any
weaknesses in a product’s electro/mechanical design and/or assembly
processes. The goal of HALT is to make products fail so that device weaknesses can be analyzed and strengthened as appropriate. Applied stresses
are continually stepped up until products eventually fail. After corrective
actions and/or design changes, stresses are stepped up again and the cycle
is repeated until the "fundamental limit of the technology" is determined.
Typical HALT Profile
100
40
80
Murata Power Solutions has invested in a Qualmark OVS-1 HALT tester
capable of applying voltage and temperature extremes as well as 6-axis,
linear and rotational, random vibration. A typical HALT profile (shown above)
consists of thermal cycling (–55 to +125°C, 30°C/minute) and simultaneous, gradually increasing, random longitudinal and rotational vibration up
to 20G’s with load cycling and applied-voltage extremes added as desired.
Many devices in Murata Power Solutions' new A-Series could not be made
to fail prior to reaching either the limits of the HALT chamber or some previously known physical limit of the device. We also use the HALT chamber
and its ability to rapidly cool devices to verify their "cold-start" capabilities.
Qualification Test
Method/Comments
HALT
Murata Power Solutions in-house procedure
High Temperature Storage
Max. rated temp., 1,000 hours
Thermal Shock
10 cycles, –55 to +125°C
Temperature/Humidity
+85°C, 85% humidity, 48 hours
Lead Integrity
Murata Power Solutions in-house procedure
Life Test
+70°C, 500 hours*
Marking Permanency
Murata Power Solutions in-house procedure
End Point Electrical Tests
Per product specification
* Interim electrical test at 200 hours.
In-Line Process Controls and Screening
A combination of statistical sampling and 100% inspection techniques
keeps our assembly line under constant control. Parameters such as
solder-paste thickness, component placement, cleanliness, etc. are statistically sampled, charted and fine tuned as necessary. Visual inspections are
performed by trained operators after pick-and-place, soldering and cleaning
operations. Units are 100% electrically tested prior to potting. All devices
are temperature cycled, burned-in, hi-pot tested and final-electrical tested
prior to external visual examination, packing and shipping.
20
40
20
0
0
–20
–40
10
20
30
40
50
60
70
Test Time (minutes)
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
80
90
Random Vibration (G's)
Temperature (°C)
60
Rapid Response to Problems
Murata Power Solutions employs an outstanding corrective-action system
to immediately address any detected shortcomings in either products or
processes. Whenever our assembly, quality or engineering personnel spot
a product/process problem, or if a product is returned with a potential
defect, we immediately perform a detailed failure analysis and, if necessary,
undertake corrective actions. Over time, this system has helped refine our
assembly operation to yield one of the lowest product defect rates in the
industry.
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/
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
notice.
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MDC_UWR14-20 Series.G01 Page 6 of 6
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