HLK-PM03 AC-DC Modular Power Supply 240V - 3.3V 3W 0.9A PCB Mount Converter

Product description: HLK-PM03 AC-DC Modular Power Supply 240V - 3.3V 3W 0.9A HLK-PM03 is a miniature power supply that accepts 100-240V AC input and delivers stable 3.3V DC with an output current capability of 0.9A. This compact module occupies far less space on PCBs than traditional PCB-mount transformers. This version is intended for direct soldering onto the printed circuit board. It works excellently as a power source in a wide range of electronic applications, including ESP8266, ESP32, Arduino, and Raspberry Pi. Module connections * AC - power input: 100-240V AC * + Vo - DC output - PLUS * - Vo - DC output - MINUS Key technical specifications

* Input voltage: 100 - 240V AC * Output voltage: 3.3V DC * Maximum output current: 900mA * Efficiency at 220V AC input: 70% * External dimensions: 34 mm x 20.2 mm x 15 mm * Permissible ambient temperature: -20°C to 60°C * Permissible ambient humidity: 5-95% * Protection: short-circuit, thermal, overcurrent

Example applications

* Powering IoT circuits based on microcontrollers requiring 3.3V (ESP8266, ESP32) * Compact Smart Home devices installed in flush-mounted wall boxes * Powering communication modules and sensors in building automation systems * DIY projects and electronic device prototypes (Arduino, Raspberry Pi) * Replacing traditional, bulky transformers in PCB power supply circuits

Benefits

* Space saving: Very small dimensions enable miniaturization of designed devices * Easy mounting: Pins designed for direct soldering to the printed circuit board * Circuit safety: Built-in short-circuit, thermal, and overcurrent protection safeguards powered components * Versatile power input: Wide input voltage range (100-240V AC) allows operation on power grids worldwide * High reliability: Stable 3.3V DC output ideal for sensitive digital electronics