EmbeddedRelated.com
    Parts   Power Management  Switching Regulators    Murata OKI-78SR Family    OKI-78SR-3.3/1.5-W36-C    OKI-78SR-3.3/1.5-W36-C
OKI-78SR-3.3/1.5-W36-C

OKI-78SR-3.3/1.5-W36-C

Murata Power Solutions
Popular drop-in switching regulator module offering 3.3 V at up to 1.5 A, higher current capacity while remaining compact and easy to use.
Active4,856 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The OKI-78SR-3.3/1.5-W36-C is a compact, drop-in switching regulator module that provides a regulated 3.3 V output at up to 1.5 A (5 W). It accepts a wide input range (7 V to 36 V) so it can replace linear 78xx regulators in higher-voltage systems while offering much higher efficiency. The module includes built-in protections such as short-circuit protection and is specified for -40 to 85 degC operation.

Why Choose This Part

Choosing this module gives much higher efficiency than a linear 78xx regulator, reducing heat and improving battery/runtime or thermal headroom on dense PCBs. The wide 7-36 V input range and 1.5 A output capability make it suitable for both 12 V and 24 V systems without additional front-end components. Its compact, ready-to-mount package and built-in protections (including short-circuit protection) simplify integration and reduce design risk.

Applications

12 V and 24 V vehicle or industrial power rails
Provide 3.3 V point-of-load regulation from automotive or industrial supplies where input can be up to 36 V.
Microcontroller and single-board computer power
Efficiently power 3.3 V digital cores and peripherals while replacing bulky linear regulators to reduce heat.
Field instrumentation and sensors
Low-heat, reliable 3.3 V supply for remote or sealed instrumentation operating over wide temperatures.
PCB-level linear-regulator replacements
Direct drop-in replacement for 78xx linear regulators to improve efficiency without major board redesign.
Prototyping and bench power
Compact module for test fixtures and development boards that need a regulated 3.3 V rail from variable inputs.

Key Specifications

Type Linear Regulator Replacement
Features SCP
Efficiency 85.5%
Applications ITE (Commercial)
Mounting Type Through Hole
Power (Watts) 5 W
Package / Case 3-SIP Module
Size / Dimension 0.41" L x 0.30" W x 0.65" H (10.4mm x 7.6mm x 16.5mm)
Number of Outputs 1
Voltage - Output 1 3.3V
Operating Temperature -40degC ~ 85degC
Voltage - Input (Max) 36V
Voltage - Input (Min) 7V
Current - Output (Max) 1.5A

Getting Started

No IDE or development board is required - this is a PCB-mount power module. Start by reviewing the Murata datasheet for recommended PCB footprint, input/output decoupling, and thermal derating curves; follow their layout guidance to minimize noise. Verify output voltage under expected load and ambient temperature, and provide adequate copper area or heatsinking if your application runs near the 1.5 A limit.

Also Consider

R-78E3.3-1.0 RECOM - Popular non-isolated switching replacement for 78xx regulators that provides 3.3 V output with a compact through-hole module.
LM2596S-3.3/NOPB TITexas Instruments - Widely available 3.3 V switching regulator IC in a TO-220 package for designs that can accommodate an external inductor and discrete components.
OKI-78SR-5/1.5-W36-C Murata - Same OKI-78SR family and package with 1.5 A capability if a 5 V output option is acceptable for your design.

Categories

Power Management > Switching Regulators