HLK-PM01 AC-DC 220V to 5V 3W Isolated Switching Power Supply Step-Down Module by Hi-Link

Overview

The Hi-Link HLK-PM01 is a ultra-miniature, isolated switching power supply module designed to step down household AC mains voltage directly to a low-voltage DC rail. Encapsulated in a rugged, flame-retardant plastic shell, this module features full electrical isolation between the high-voltage AC side and the low-voltage DC side.

It is the industry-standard choice for DIY automation enthusiasts, engineering students, and commercial makers who need to power 5V microcontrollers (like an Arduino, ESP32, or relay module) directly from a household wall outlet or junction box without adding unnecessary bulk.

Key Features

• Ultra-Compact Footprint: Extremely small dimensions allow it to easily fit inside wall switches, extensions, or tight project boxes.

• Full Electrical Isolation: High isolation voltage safeguards your sensitive low-voltage microcontroller logic from high-voltage AC mains line faults.

• Global Voltage Compatibility: Accepts any input from 90V AC all the way up to 264V AC, making it highly stable during local voltage fluctuations.

• Low Noise & Ripple: Delivers clean output voltage with minimal high-frequency ripple, keeping your MCU data stable.

• Built-in Protection Suite: Onboard short-circuit protection, over-current protection, and thermal shutdown mechanisms keep your circuit secure.

Technical Specifications

Pin Mapping 

• AC Pins (Input Side): Connect to your Neutral (N) and Live (L) 220V household lines. (Polarity doesn’t matter for the input pins).

• -V Pin (Output Side): Ground / Negative output terminal connection.

• +V Pin (Output Side): Regulated +5V DC positive output terminal connection.