Hi-Link HLK-5M12 12V 5W AC-DC Step-Down Switch Power Supply Module

Power 12V relays, solenoids, and microcontrollers directly from mains power with the Hi-Link HLK-5M12 12V 5W Switch Power Supply Module. Built as an ultra-compact, PCB-mount isolated AC-DC step-down converter, it transforms wide input AC voltages ( $90 ext{V}$ to $264 ext{V AC}$ ) into a regulated, low-ripple 12V DC output at up to 416mA (5W). Featuring flame-retardant encapsulation, short-circuit protection, ultra-low standby power consumption ( $<0.1 ext{W}$ no-load), and $3000 ext{V AC}$ isolation, it is the go-to solution for smart home automation, 12V relay control boards, and compact IoT embedded designs.

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Tags Hi Link HLK 5M12 HLK-5M12 12V 5W AC DC Step Down Module 12V 450mA Power Module Isolated SMPS Module PCB Mount AC DC Converter 12V Relay Driver Power Supply Smart Home Power Module

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Product Details :

The Hi-Link HLK-5M12 12V/5W Switch Power Supply Module is an encapsulated, highly integrated AC-DC power converter designed to safely convert high-voltage mains electricity down to a stable 12V DC rail on a single PCB. Eliminating the need for bulky external wall adapters or open-frame transformers, the HLK-5M12 packs a complete switched-mode power supply (SMPS) into a tiny, fully potted plastic casing.

Engineered to accept a universal AC input voltage range from 90V AC up to 264V AC (50Hz/60Hz), it provides a regulated 12V DC output with up to 416mA of continuous current. Its fully isolated construction (providing up to $3000 ext{V AC}$ input-to-output isolation) protects sensitive microcontrollers and control circuitry from high-voltage line surges. Its 12V rail is tailored for driving 12V electromagnetic relays, DC solenoids, cooling fans, and onboard step-down LDOs/buck regulators in automated home switch boxes and industrial control units.

Key Features and Benefits

Compact PCB-Mount Footprint: Fully enclosed potted module easily plugs into standard through-hole PCB layouts, prototyping boards, or custom enclosures.
Global Universal AC Input: Accepts wide input voltages ( $90 ext{V AC} - 264 ext{V AC}$ at $50/60 ext{Hz}$ ), ensuring seamless compatibility with global electrical grids.
Stable 12V Output Rail: Delivers a clean, regulated $12 ext{V DC}$ output—ideal for switching 12V relay coils without logic supply voltage sag.
High Electrical Safety & Isolation: Delivers continuous input-to-output isolation up to $3000 ext{V AC}$ , safeguarding low-voltage logic components.
Integrated Hardware Safety Protections: Features onboard over-current, short-circuit, and thermal defense circuits that automatically recover once faults are cleared.
Eco-Friendly Low Standby Power: Consumes less than $0.1 ext{W}$ under no-load conditions, making it an energy-efficient choice for always-on IoT equipment.

Technical Specifications

Feature Component	Specification Details
Model Designation	HLK-5M12 (Hi-Link Series)
Input Voltage Range ( $V_{AC}$ )	$90 ext{V AC} - 264 ext{V AC}$ ( $100 ext{V} - 240 ext{V}$ Nominal)
Input Frequency Range	$47 ext{ Hz} - 63 ext{ Hz}$
Output Voltage ( $V_{DC}$ )	$12.0 ext{V DC} pm 0.1 ext{V}$ (Regulated)
Maximum Output Current	$416 ext{ mA}$ ( $0.416 ext{A}$ ) Continuous
Maximum Rated Power	$5.0 ext{ Watts}$
Full Load Efficiency	$ge 70%$
No-Load Power Consumption	$< 0.1 ext{ Watts}$
Input-to-Output Isolation	$3000 ext{V AC}$ for 1 minute
Output Ripple & Noise	$le 50 ext{ mVp-p}$
Short-Circuit Protection	Automatic recovery upon fault removal
Operating Temperature	$-20^circ ext{C to } +60^circ ext{C}$

Pinout & Wiring Guide

The HLK-5M12 features 4 through-hole PCB pins clearly labeled on its housing:

Input Side (High Voltage AC):

AC / L (Pin 1): Connect to Live / Phase mains input wire ( $90 ext{V} - 264 ext{V AC}$ ).
AC / N (Pin 2): Connect to Neutral mains input wire.

Output Side (Low Voltage DC):

-V0 / GND (Pin 3): Ground / Negative output rail ( $0 ext{V DC}$ ).
+V0 / +12V (Pin 4): Regulated $+12 ext{V DC}$ positive output rail.

Safety Warning: The AC input side operates at high line voltages ( $110 ext{V}-230 ext{V AC}$ ) which carry severe risk of electric shock. Always insulate AC connections, maintain creepage distances on PCBs, and disconnect mains power before handling the circuit.

Applications

12V Relay Control Systems: Powers 12V relay boards, door strikes, and solenoids in smart home switch modules and access control setups.
Dual-Rail Power Architectures: Provides a primary $12 ext{V}$ rail to drive inductive loads, which can then step down (via an buck converter or 7805) to power $5 ext{V}$ or $3.3 ext{V}$ microcontrollers.
Smart Home Automation: Powers embedded ESP32 / STM32 controllers concealed within standard electrical junction boxes.
Small Industrial Controllers: Delivers compact auxiliary power for sensors, instrumentation modules, and PLC accessory boards.