www.murata-ps.com
FEATURES
Typical units
PRODUCT OVERVIEW
OKI-78SR Series
Fixed Output 1.5 Amp SIP DC/DC Converters
?
? Ultra wide 7 to 36 VDC input range
?
?
? Fixed Outputs of 3.3 or 5 VDC up to 1.5 Amps
? Vertical or horizontal SIP-mount, small footprint
package
?
? “No heat sink” direct replacement for 3-terminal
78xx-series linear regulators
?
?
? High ef?ciency with no external components
? Short circuit protection
?
? Outstanding thermal derating performance
Fabricated on a 0.41 by 0.65 inch (10.4 by 16.5
mm) Single Inline Package (SIP) module, the OKI-
78SR series are non-isolated switching regulator
(SR) DC/DC power converters for embedded ap-
plications. The ?xed single output converters offer
both tight regulation and high ef?ciency directly
at the power usage site and are a direct plug-in
replacement for TO-220 package 78xx series linear
regulators. Typically, no extra outside components
are required.
Two nominal output voltages are offered (3.3
and 5 VDC), each with 1.5 Amp maximum output.
Based on ?xed-frequency buck switching topology,
the high ef?ciency means very low heat and little
electrical noise, requiring no external components.
The ultra wide input range is 7 to 36 Volts DC.
Protection features include short circuit current
limit protection. The OKI-78SR is designed to meet
all standards approvals. RoHS-6 (no lead) hazard-
ous material compliance is speci?ed as standard.
?
? UL/EN/IEC 60950-1, 2nd Edition safety approvals
Connection Diagram
F1
External
DC
Power
Source
+Vin
Common
Controller
Reference and
Error Ampli ?er
+Vout
Common
Figure 1. OKI-78SR
Note: Murata Power Solutions strongly recommends an external input fuse, F1.
See speci?cations.
 
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_OKI-78SR-W36.C01 Page 1 of 12
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