HLK-PM03 AC-DC Power Supply Module 220v to 3.3V

Compact 3W 3.3V Output: Encapsulated mini power supply module converts AC grid power into a regulated 3.3V DC output at up to 0.9A (3W max), engineered specifically for direct PCB through-hole mounting.

Universal Mains AC Input: Operates reliably across a wide input voltage window of 100V–240V AC (50/60Hz) grid power with high energy conversion efficiency and minimal standby power loss ($<0.1\text{W}$).

Fully Isolated & Encapsulated Body: Plastic shell potting provides $3000\text{VAC}$ input-to-output electrical isolation, moisture resistance, dustproofing, and thermal management for delicate low-voltage chips.

Silent Solid-State Operation: Completely fan-less, noiseless operation with low output ripple voltage, designed specifically for powering sensitive 3.3V microcontrollers and radio modules.

Integrated Safety Protections: Internal automatic safeguards protect connected components against short circuits, continuous current overloads, and mains power surges.

Housing & Casing Style: Flame-retardant plastic potted housing designed for compact PCB layout integration and natural thermal dissipation.

Contact & Terminal Style: Standard through-hole PCB pin contacts (AC, AC, -Vo, +Vo).

Technical Specifications:

Model: HLK-PM03.

Input Voltage: AC 100V–240V (50\60Hz).

Output Voltage: DC 3.3V.

Output Current: 0A – 0.9A Max (900mA).

Rated Power: 3W.

Cooling: Passive thermal dissipation via internal potting compound.

Color: Black shell with white pin identification legend.

Usage Advice: Calculate continuous power requirements to remain within the 3W (900mA) rated threshold. Maintain adequate PCB creepage and clearance distances between AC high-voltage traces and low-voltage DC traces.

Maintenance: Solid-state potted module requires zero physical maintenance. Ensure reasonable passive airflow inside small project enclosures.

Essential 3.3V Native Logic Power Node: Position as the go-to power module for native 3.3V microcontrollers and wireless SoCs (ESP32, ESP8266, STM32, NRF52, Raspberry Pi Pico) without requiring secondary 5V-to-3.3V LDO regulators.

Highlight Direct 3.3V Power & Compact Size: Emphasize its ability to supply up to 900mA directly at 3.3V, handling Wi-Fi/Bluetooth TX current spikes with ease inside compact smart home products.

Recommended Cross-Sell Add-ons: Pair with HLK-PM01 AC-DC Power Supply Module 220V to 5V, HLK-PM12 AC-DC Power Supply Module 220V to 12V, HLK-2M05 AC-DC Power Supply Module 220V to 5V, and ESD antistatic mat 50x40CM PCB Welding Mat.

Featured Collection Star: Display prominently on your Hi-Link Power Supply Module (HLK) collection page as your primary 3.3V logic power module.