12V 300mA SMPS Small Power Supply Open Type
Price in Sri Lanka

This compact, open-frame Switching Mode Power Supply (SMPS) is designed for high-efficiency power conversion in space-constrained applications. It converts a wide range of AC input voltages (from 45V up to 277V) into a stable 12V DC output. With an ultra-small footprint and high conversion efficiency, it is an ideal choice for powering low-power microcontrollers, IoT sensors, and control boards directly from the mains.

Specifications

• Input Voltage: AC 45V to 277V
• Output Voltage: DC 12V
• Output Current: 300mA (Max)
• Output Power: 4W (Max)
• AC Frequency: 50Hz / 60Hz
• Conversion Efficiency: 95%
• Operating Temperature: -20C to 85C
• Protection Features: Over-Current, Short Circuit, and Over-Voltage protection
• Type: Open-frame (non-enclosed)

Features

• Ultra-Wide Input Range: Operates reliably on AC voltages from as low as 45V to as high as 277V, making it globally compatible and resilient to voltage fluctuations.
• High Efficiency: A 95% conversion efficiency minimizes heat generation, allowing the module to run cool despite its small size.
• Compact Footprint: The "Open Type" design eliminates a bulky outer casing, making it perfect for embedding directly onto custom PCBs or inside small project boxes.
• Integrated Safety: Built-in protections for short circuits and over-voltage ensure that both the power supply and your connected electronics are shielded from electrical faults.
• Industrial Temperature Range: Rated to work in environments from -20C up to 85C, suitable for outdoor sensor nodes or industrial control panels.

Pin and Terminal Guide

• Input Side (AC):
  • L (Live): Connect to the AC Phase/Live wire.
  • N (Neutral): Connect to the AC Neutral wire.
• Output Side (DC):
  • V+: 12V DC Positive output.
  • V-: DC Ground / Negative output.

Common Applications

• IoT Node Power: Powering ESP32, ESP8266, or Arduino-based sensors directly from a wall outlet.
• Smart Home Devices: Providing power for smart switches, relays, and small internal displays.
• DIY Electronics: A lightweight alternative to traditional wall-adapter power bricks for permanent installations.
• Small Industrial Controls: Powering 12V relays or signal converters in larger control systems.

Usage Tips

• Safety Warning: This is an "Open Type" module with exposed high-voltage components. Never touch the board while it is connected to AC power.
• Insulation: When mounting, ensure the bottom of the PCB is insulated from any metal surfaces using standoffs or a non-conductive plastic base.
• Capacitance: While the module is highly efficient, adding a small electrolytic capacitor (e.g., 100uF to 470uF) at the DC output can help further smooth out any ripple for extremely sensitive electronics.