Power adapter/inverter mean well IRM-01-3.3S, 1 W, 3.3 V output, 0.3 A, input 85–305 V

Mean Well IRM-01-3.3S is a compact 1 W AC-DC encapsulated power module with a universal input range of 85–305 VAC and a fixed 3.3 V DC output capable of supplying up to 0.3 A. Designed for surface-mount applications and space-constrained installations, this miniature power adapter provides regulated low-voltage power for small electronic systems while meeting RoHS environmental standards. Its small footprint and low weight make it suited to embedded designs, signal processing modules and compact consumer electronics where efficient, reliable low-power conversion is required.

Advantages

The module delivers stable 3.3 V output at low currents with high input voltage tolerance, enabling use across different mains supplies. Its encapsulated SMD form factor simplifies integration onto PCBs and helps protect internal components from dust and mechanical stress. Low weight and minimal depth make it practical for tight enclosures and portable devices. Compliance with RoHS supports environmentally conscious designs.

Suitable for

• Embedded systems and microcontroller boards requiring 3.3 V supply
• Signal processing and sensor modules with low power demand
• Compact consumer electronics and portable devices
• Industrial control units with space limitations

Key specifications

• Power output: 1 W nominal
• Input voltage range: 85–305 VAC (universal AC input)
• Output voltage: 3.3 V DC (fixed)
• Maximum output current: 0.3 A
• Mounting type: SMD / surface-mount
• Encapsulation: encapsulated module for PCB integration
• Dimensions: depth 33.7 mm, height 15 mm (compact footprint)
• Weight: approximately 19 g
• Environmental: RoHS compliant

How to use

Integrate the module onto the printed circuit board following standard SMD soldering guidelines and the manufacturer’s recommended land pattern to ensure reliable solder joints. Provide AC input within the specified 85–305 VAC range and route the DC 3.3 V output to the target circuitry, observing polarity and any decoupling requirements. Allow for adequate creepage and clearance when routing mains traces near low-voltage circuits and consider placing a thermal relief or ventilation if the module is enclosed in a small case to maintain safe operating temperature.

Recommendations

Use filtering and transient protection on the AC input when deploying in electrically noisy environments. Add local decoupling capacitors on the 3.3 V output close to sensitive ICs to stabilize supply and reduce noise. Verify thermal conditions in confined enclosures and avoid continuous operation at maximum rated current without ensuring sufficient heat dissipation.