AC-DC Precision Buck Converter — 220V to 5V/9V/12V, 3.5W, Isolated, PCB Mount

AC-DC Precision Buck Converter — 220V to 5V/9V/12V, 3.5W, Isolated, PCB Mount

This AC-DC precision buck converter module converts universal mains AC (85–265V, 50/60Hz) directly to regulated 5V, 9V, or 12V DC on a compact PCB-mount module — eliminating the need for an external power adapter in embedded applications. The isolated design provides electrical safety between mains input and DC output. A comprehensive protection suite (overvoltage, overcurrent, overtemperature, overpower, short circuit) and MTBF of over 16,000 hours at 80% load make it suitable for industrial and long-term installations.

Specifications

• Input Voltage: AC 85–265V, 50/60Hz (universal mains)
• Output Voltage: 5V (±0.2V) / 9V / 12V (select version)
• Output Current: 700mA (5V version)
• Output Power: 3.5W
• Efficiency: ~80%
• Isolation: AC-DC galvanic isolation
• Protection: Overvoltage, overcurrent, overtemperature, overpower, short circuit
• MTBF: >16,000 hours at 80% load
• Dimensions: 30 × 20 × 18mm
• Package: PCB mount (DIP-style pins)

Safety Warning

⚠️ This module connects directly to mains AC voltage. Use appropriate enclosures, insulation, and follow electrical safety regulations. Suitable for qualified engineers and experienced makers only.

Typical Applications

• Smart switch / smart relay mains-powered Arduino
• Industrial control panel embedded 5V/12V supply
• IoT energy monitor powered from mains
• LED driver power from mains
• Embedded appliance controller power supply

AC-DC precision buck converter — 85–265V to 5V/9V/12V, 3.5W, isolated, full protection for embedded mains power in smart switches and industrial control applications.