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The Hi-Link WRB1209S-3WR3 is a compact, high-efficiency 3W regulated DC-DC converter module designed to deliver stable output power in space-constrained electronic designs. Featuring a 2:1 wide input voltage range of 9V to 18V DC (12V nominal), it steps down variable primary DC rails to a clean, isolated 9V DC output with up to 333mA of continuous drive current.

Engineered with $1500\text{V DC}$ input-to-output isolation, the WRB1209S-3WR3 effectively breaks ground loops, suppresses electrical noise, and guards low-voltage processing circuitry against high-voltage surges on the input line. Its space-saving Single In-line Package (SIP) format allows high-density mounting on printed circuit boards, making it ideal for precision instrumentation, industrial automation, telecom gear, and battery-powered electronics.

Key Features and Benefits

• Wide 2:1 Input Voltage Range: Accepts $9\text{V DC}-18\text{V DC}$ ($12\text{V DC}$ nominal), effortlessly handling voltage dips and spikes in 12V battery and industrial supply rails.

• 1500V DC High Galvanic Isolation: Provides isolation between primary input and secondary output grounds to protect sensitive circuits and eliminate noise loops.

• Compact SIP Plastic Encapsulation: Ultra-small footprint saves valuable PCB real estate in dense electronic layouts.

• Regulated 9V 333mA (3W) Output: Maintains tight output voltage regulation ($\pm 1\%$) across full load ranges with minimal voltage drift.

• Built-in Safety Protections: Features continuous output short-circuit protection (with auto-recovery) to safeguard the module and downstream devices.

• Low No-Load Power Consumption: Minimizes quiescent power loss, rendering it suitable for energy-conscious and always-on applications.

Technical Specifications

Pinout & Wiring Guide

The WRB1209S-3WR3 comes in an 8-pin SIP footprint (standard pinout configuration):

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 $+9\text{V DC}$ Output Rail.

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

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

Wiring Tip: For ultra-sensitive analog measurements or audio applications, add 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 $-Vout$ to form an LC filter that further suppresses output ripple.

Applications

• Sensors & Measurement Modules: Powers $9\text{V}$ analog sensors, op-amps, and signal conditioning boards isolated from noisy system supplies.

• Industrial Automation & Fieldbus Interfaces: Drives isolated RS-485, CAN, or Modbus communication transceivers.

• Battery-Powered Equipment: Converts multi-cell Li-ion or standard $12\text{V}$ lead-acid battery rails down to clean $9\text{V}$ operating levels.

• Distributed Power Systems: Creates isolated sub-power domains on multi-board embedded systems to prevent ground noise coupling.

Package Includes

• 1 x Hi-Link WRB1209S-3WR3 12V to 9V 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