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The Hi-Link WRB1205S-3WR3 is a high-efficiency 3W regulated DC-DC converter designed for precision electronics and industrial control applications. Built with a 2:1 wide input range of 9V to 18V DC (12V nominal), it steps down variable DC voltages to a tightly regulated 5V DC output with up to 600mA of drive current.

Engineered with $1500\text{V DC}$ input-to-output isolation, this module isolates ground systems, prevents ground loops, and protects delicate low-voltage processing circuits (like $5\text{V}$ microcontrollers or ADCs) from voltage spikes and noise originating on the primary supply line. Its compact Single In-line Package (SIP) format allows high-density mounting on printed circuit boards, making it ideal for IoT gateways, industrial automation, and automotive electronics.

Key Features and Benefits

• Wide 2:1 Input Voltage Range: Handles input variations between $9\text{V DC}-18\text{V DC}$ ($12\text{V DC}$ nominal), effortlessly absorbing voltage fluctuations in 12V automotive and industrial power buses.

• 1500V DC High Galvanic Isolation: Separates input and output grounds to protect sensitive microcontrollers and eliminate ground loop noise.

• Regulated 5V 600mA (3W) Output: Delivers a stable $5\text{V}$ rail with tight load regulation ($\pm 1\%$), perfect for driving 5V logic ICs, sensors, and relays.

• Space-Saving SIP Footprint: Ultra-small plastic encapsulation saves valuable PCB area in space-constrained embedded hardware.

• Continuous Short-Circuit Protection: Features auto-recovery short-circuit protection to protect both the module and downstream devices.

• Low Idle Current & High Efficiency: Delivers up to 82% conversion efficiency, keeping thermal dissipation low.

Technical Specifications

Pinout & Wiring Guide

The WRB1205S-3WR3 utilizes an 8-pin SIP footprint (standard Hi-Link pinout layout):

Pin Configuration:

• Pin 1 (GND / -Vin): Primary DC Input Negative Ground ($9\text{V}-18\text{V}$ return).

• Pin 2 (+Vin): Primary DC Input Positive ($+9\text{V}$ to $+18\text{V DC}$).

• Pin 3 (Ctrl / Remote): Remote Control Pin (Leave floating / open for default ON operation; pull low to turn off).

• Pin 5 (NC): No Connection (Leave unconnected).

• Pin 6 (+Vout): Isolated Regulated $+5\text{V DC}$ Output Rail.

• Pin 7 (0V / -Vout): Isolated Secondary Output Ground ($0\text{V DC}$).

• Pin 8 (NC): No Connection (Leave unconnected).

Wiring Tip: To further reduce high-frequency ripple on sensitive analog outputs, connect a low-ESR ceramic capacitor ($10\mu \text{F}$) and a small inductor ($4.7\mu \text{H}-10\mu \text{H}$) across $+Vout$ and $-Vout$.

Applications

• Microcontroller Powering: Safely drives $5\text{V}$ Arduino Unos, ATmega chips, and sensors off noisy 12V vehicle or industrial supply lines.

• Isolated Data Interfaces: Powers isolated RS-485, RS-232, and CAN transceiver interfaces to prevent common-mode noise issues.

• Precision Measurement Systems: Supplies clean $5\text{V}$ power to sensitive ADCs and signal conditioning circuits isolated from noisy motor drives.

• Automotive Electronics: Converts 12V car battery power into clean 5V logic rails resistant to alternator spikes.

Package Includes

• 1 x Hi-Link WRB1205S-3WR3 12V to 5V 3W Isolated DC-DC Converter Module

Shipping & Delivery

• Free shipping on orders above ₹999 across India

• Dispatched within 1-3 business days

• Expected delivery: 3-7 business days depending on location

• Secure packaging to ensure safe transit of electronic components