Power adapter/inverter Mean Well SPAN02B-03 — 18–36 V input, 2 W output, 0.5 A

Mean Well SPAN02B-03 is a compact DC-DC converter designed for PCB-mount applications where stable low-power conversion is required. The module accepts a wide input range of 18–36 Vdc and delivers a regulated single output of 3.3 Vdc at up to 0.5 A, with a rated output power of 2 W. Packaged in a SIP through-hole format for straightforward insertion on printed circuit boards, the converter is intended for embedded systems, industrial control modules and sensor interfaces that need a reliable 3.3 V supply from higher-voltage DC rails.

Advantages

The SPAN02B-03 offers a compact footprint and through-hole SIP package that simplifies PCB mounting and mechanical support. Its wide input range of 18–36 V allows use with various DC supply sources, while the regulated 3.3 V output provides a stable voltage for digital electronics and low-power peripherals. Compliance with RoHS ensures reduced hazardous substances, and the converter’s low output power and current rating make it suitable for energy-efficient and temperature-sensitive installations.

Suitable for

• Embedded systems and microcontroller boards requiring 3.3 V from higher-voltage rails
• Industrial control modules and PLC I/O interfaces
• Sensor power for low-current measurement and transmit modules
• Prototyping and small-volume PCB designs where SIP mounting is preferred

Key specifications

• Input voltage range: 18–36 Vdc
• Output voltage: 3.3 Vdc (regulated)
• Maximum output current: 0.5 A
• Rated output power: 2 W
• Package type: SIP through-hole PCB mount
• Application type: DC-DC converter for low-power use
• Standards: RoHS-compliant

How to use

Install the SPAN02B-03 into the PCB using the SIP through-hole pins and ensure correct polarity and secure solder joints. Connect the input to a DC supply within 18–36 V range and verify that the supply can provide any inrush current required by the system. Load the 3.3 V output with devices that do not exceed 0.5 A continuous current. Observe standard PCB layout practices for DC-DC converters: keep input and output traces short, provide adequate grounding and place decoupling capacitors near sensitive circuits as recommended by the system design.

Recommendations

Use the converter within specified voltage and current limits to ensure reliable operation. For thermal management, avoid enclosing the module in poorly ventilated spaces when operating near maximum load. Verify compatibility of connected devices with a 3.3 V supply and include fusing or current protection on the input if the application requires additional safety.