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OKI-78SR-5/1.5-W36H-C

OKI-78SR-5/1.5-W36H-C

Murata Power Solutions Inc.
Linear Regulator Replacement DC DC Converter 1 Output 5V 1.5A 7V - 36V Input
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Overview

The OKI-78SR-5/1.5-W36H-C is a non-isolated switching regulator designed to be a direct, high-efficiency drop-in replacement for TO-220 package 7805 series linear regulators. It converts a wide input range of 7V to 36V down to a stable 5V output at up to 1.5A. This horizontal-mount SIP module eliminates the need for bulky heatsinks by utilizing a high-efficiency buck converter topology.

Why Choose This Part

The module offers a significant efficiency advantage at 90.5%, which removes the thermal bottlenecks typical of linear regulators in high-voltage drop scenarios. It features integrated short-circuit protection and requires no external components for standard operation. The horizontal SIP mounting profile is ideal for applications with tight vertical clearance requirements.

Applications

Legacy System Upgrades
Replacing inefficient LM7805 linear regulators in existing designs to reduce heat and extend component life.
Industrial Control Logic
Providing 5V logic power from 12V or 24V industrial rails with 90.5% efficiency.
Battery Powered Systems
Maximizing run-time in portable devices by minimizing the power wasted as heat compared to linear regulation.
Distributed Power Architectures
Acting as a local point-of-load (PoL) regulator for digital circuits in larger embedded systems.

Key Specifications

Type Linear Regulator Replacement
Features SCP
Efficiency 90.5%
Applications ITE (Commercial)
Mounting Type Through Hole
Power (Watts) 8 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 5V
Operating Temperature -40degC ~ 85degC
Voltage - Input (Max) 36V
Voltage - Input (Min) 7V
Current - Output (Max) 1.5A

Getting Started

To integrate this module, simply match the three-pin footprint to a standard TO-220 layout (Input, Ground, Output). While the device functions without external capacitors, adding a 10uF ceramic capacitor at the input and output is recommended to further reduce ripple and improve transient response. Ensure the input voltage stays within the 7V to 36V range for stable operation.

Also Consider

OKI-78SR-5/1.5-W36-C Murata Power Solutions Inc. - The vertical-mount version of the same regulator for designs with limited PCB area but more vertical clearance.
TSR 1-2450 TRACO Power - A pin-compatible 1A version that offers a smaller physical footprint if 1.5A is not required.