OKI-78SR Series
Non-Isolated Switching Regulator DC-DC
New!
12V
Model
Typical units
PRODUCT OVERVIEW
FEATURES
Fabricated on a 0.41 x 0.65 inch (10.4 x 16.5 Three nominal output voltages are offered (3.3,
7-36Vin (3.3 & 5Vout), 15-36Vin (12Vout)
mm) Single Inline Package (SIP) module, the OKI- 5 and 12 VDC), up to 1.5 Amp maximum output.
Fixed Output: 3.3 or 5V @ 1.5A or 12V @ 1.0A
78SR series are non-isolated switching regulator Based on xed-frequency buck switching
Vertical SIP or horizontal mount, small footprint
(SR) DC-DC power converters for embedded ap- topology, the high efciency means very low heat
package
plications. The xed single output converters offer and little electrical noise, requiring no external
both tight regulation and high efciency directly at components. The 3.3 and 5Vout models have an
No heat sink direct replacement for 3-terminal
the power usage site and are a direct plug-in ultra wide input range of 7 to 36 Volts DC and the
78xx-series linear regulators
replacement for TO-220 package 78xx series 12Vout model has an input voltage range of 15 to
High efciency with no external components
linear regulators. Typically, no extra outside 36V.
Short circuit protection
components are required.
Protection features include short circuit current
Outstanding thermal derating performance
limit protection. The OKI-78SR is designed to
UL/EN/IEC 60950-1, 2nd Edition safety approvals meet all standards approvals. RoHS-6 (no lead)
hazardous material compliance is specied as
standard.
Connection Diagram
+Vin +Vout
Switching
F1
Filters
Controller
Current Sense
External
DC
Power
Reference and
Source
Error Amplier
Common Common
Figure 1. OKI-78SR
Note: Murata Power Solutions strongly recommends an external input fuse, F1.
See specications.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_OKI-78SR-W36.C05 Page 1 of 20 OKI-78SR Series
Non-Isolated Switching Regulator DC-DC
FUNCTIONAL SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output Input
IOUT R/N (mVp-p) Regulation (Typ.) IIN, IIN, Efficiency
VOUT (Amps Power VIN Nom. Range no load full load
Package
Root Model (Volts) max) (Watts) Max. Line Load (Volts) (Volts) (mA) (Amps) Min. Typ.
Inches (mm)
0.41 x 0.34 x 0.65
OKI-78SR-3.3/1.5-W36-C 3.3 1.5 4.95 40 0.25% 0.40% 12 7-36 5 0.48 84% 85.5%
(10.4 x 8.64 x 16.5)
0.41 x 0.34 x 0.65
OKI-78SR-5/1.5-W36-C 5 1.5 7.5 75 0.25% 0.40% 12 7-36 5 0.69 89% 90.5%
(10.4 x 8.64 x 16.5)
0.41 x 0.34 x 0.65
NEW
OKI-78SR-12/1.0-W36-C 12 1.0 12 75 0.25% 0.25% 24 15-36 5 0.53 93.5% 95.3%
(10.4 x 8.64 x 16.5)
NOTE: All specifications are at nominal line voltage, Vout = nominal and full load, +25C.with no external capacitor, unless otherwise noted.
PART NUMBER STRUCTURE
OKI - 78SR - 3.3 / 1.5 - W36 H - C
RoHS-6 Hazardous
Substance Compliance
Okami Non-Isolated PoL
Blank: Vertical Mount
78SR Series
H Sufx: Horizontal Mount
Note:
Some model number combinations
Maximum Rated Output in Volts
may not be available.
Input Voltage Range
Contact Murata Power Solutions.
7-36V (3.3 & 5Vo)
Maximum Rated Output 15-36V (12Vo)
Current in Amps
Product Label
Because of the small size of these products, the product label contains a
Model Number Product
character-reduced code to indicate the model number and manufacturing date
Code
OKI-78SR-3.3/1.5-W36-C I33115
code. Not all items on the label are always used. Please note that the label dif-
fers from the product photograph on page 1. Here is the layout of the label: OKI-78SR-5/1.5-W36-C I50115
The label contains three rows of information:
OKI-78SR-12/1.0-W36-C I12110
OKI-78SR-3.3/1.5-W36H-C I33115H
OKI-78SR-5/1.5-W36H-C I50115H
XXXXXX Product code
OKI-78SR-12/1.0-W36H-C I12110H
Mfg.
date YMDX Rev. Revision level
code
The manufacturing date code is four characters:
First character Last digit of manufacturing year, example 2009
Second character Month code (1 through 9 = Jan-Sep;
O, N, D = Oct, Nov, Dec)
Figure 2. Label Artwork Layout
Third character Day code (1 through 9 = 1 to 9, 10 = 0 and
First row Murata Power Solutions logo 11 through 31 = A through Z)
Second row Model number product code (see table) Fourth character Manufacturing information
Third row Manufacturing date code and revision level
www.murata-ps.com/support
MDC_OKI-78SR-W36.C05 Page 2 of 20