DC-DC-converter MEAN WELL DCWN03B-12 3W 18-36V 125mA

The MEAN WELL DCWN03B-12 is a compact DC-DC converter delivering 3W of output power. It accepts a DC input voltage range of 18–36V and provides a regulated output current of 125mA. With small dimensions of 20.3mm × 31.8mm × 10.2mm, the module is suitable for installations with limited space where reliable voltage conversion and low-profile design are required.

Advantages

The converter offers a small footprint and light weight while maintaining stable output current and efficient power conversion. Its wide input voltage range allows flexible use with varied supply sources. Thermal behaviour and mechanical dimensions make it easy to integrate into compact electronic assemblies without significant redesign of enclosures or mechanical supports.

Suitable for

• Embedded systems and single-board computers requiring a stable auxiliary supply
• Industrial control panels and sensors with limited space for power modules
• Telecommunications equipment and interface modules needing isolated or regulated outputs
• Battery-powered or vehicle applications operating within the input voltage range

Key specifications

• Output power: 3 W
• Input voltage range: 18–36 V DC
• Output current: 125 mA
• Package dimensions: 20.3 mm × 31.8 mm × 10.2 mm
• Typical conversion type: DC-DC step-down/isolation as applicable to module design

How to use

Install the DC-DC converter on a stable surface or PCB according to the mechanical dimensions. Connect the input to a DC supply within the specified 18–36 V range, observing correct polarity. Connect the output to the load that requires the regulated current or voltage provided by the module. Ensure adequate cooling or airflow when the module is used near its power limits and verify connections before applying power to avoid damage to the converter or connected equipment.

Recommendations

For reliable operation, keep the module within its rated input range and avoid extended operation at maximum ambient temperature. Provide at least minimal spacing around the module for heat dissipation, and use proper decoupling or filtering on input and output lines if the application is sensitive to electrical noise.