AC-DC Module 3W 220Vac to 3.3Vdc HLK-3M03B
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Prices updated: 13 Oct 2026
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About this product
The HLK-3M03B from Hi-Link is a compact AC-DC module that converts 220Vac mains into a 3.3Vdc output rated at 0.9A (3W). It is intended for powering 3.3V microcontrollers, wireless modules and low-power sensors directly from the mains. Because the input is mains voltage, install it in an insulated enclosure and check the wiring before power-up.
Specifications
- Input voltage
- 220Vac
- Output voltage
- 3.3Vdc
- Output current
- 0.9A
- Output power
- 3W
Frequently asked questions
Can I power an ESP32 board from this module?
The 3.3Vdc output matches the ESP32's logic supply, but keep the total load within 0.9A. WiFi transmission can cause short current peaks, so leave some margin or add bulk capacitance.
Can it power a 5V board such as Arduino Uno?
No. The output is 3.3Vdc only. For 5V boards use a 5V output module such as the HLK-10M05B.
