Power adapter/inverter Mean Well RSDW20G-03 — 20 W, Input 18–75 V, Output 3 V, RoHS

Mean Well RSDW20G-03 is a compact DC-DC railway single output converter designed for embedded and industrial applications. It accepts a wide input range of 18–75 VDC and provides a regulated 3.3 VDC output at up to 5.5 A. The module features 1.5 kVDC input-to-output isolation, a DIP through-hole package suitable for PCB mounting, and a Remote ON/OFF control. The unit is RoHS-compliant and intended for projects that require a small, lightweight 20 W DC power converter.

Advantages

The converter delivers a stable 3.3 V output with up to 5.5 A current in a compact 50.8 mm deep, 35 g package, enabling space- and weight-constrained designs. Wide 18–75 VDC input range allows compatibility with various DC power sources used in railway and industrial environments. 1.5 kVDC isolation improves safety between input and output circuits, and the DIP through-hole form factor simplifies PCB mounting and mechanical retention. Remote ON/OFF adds control flexibility for system integration.

Suitable for (tasks / use cases)

• Embedded railway electronics and on-board power supplies
• Industrial control systems and automation modules
• Battery-powered systems and wide-voltage DC buses
• PCB-mounted power rails in compact assemblies

Key specifications

• Brand: Mean Well (RSDW20G-03)
• Output: 3.3 VDC, up to 5.5 A (20 W)
• Input voltage range: 18–75 VDC
• Isolation: 1.5 kVDC input-to-output
• Package: DIP through-hole
• Depth: 50.8 mm; Weight: 35 g
• Control: Remote ON/OFF
• Compliance: RoHS

How to use

Mount the DIP through-hole module securely on the PCB following the manufacturer's pinout and recommended footprint. Apply a DC input voltage within 18–75 VDC to the input terminals, and connect the load to the 3.3 V output. Use the Remote ON/OFF pin to enable or disable the output according to the product's logic level specification. Ensure proper thermal management and clearance around the module to maintain reliable operation at rated load.

Recommendations

For reliable performance, operate the converter within the specified input range and avoid prolonged operation at maximum load without appropriate cooling. Verify isolation requirements in your system and follow PCB layout guidelines from Mean Well to minimize noise and ensure stable output under varying input conditions.