Description
Product Overview
The 12V 300mA 3.5W Switching Power Supply Module is a compact, high-efficiency AC-DC converter designed to power your microcontroller projects, embedded systems, and industrial devices directly from a wall outlet. Rated at 3.5 Watts (12V @ 300mA), this tiny module eliminates the need for bulky power bricks by converting hazardous AC mains voltage (85V–265V) into a stable, regulated 12V DC output .
This module is a perfect solution for powering relays, solenoid valves, LED strips, wireless modules, Arduino, ESP32, STM32, and various sensors . Unlike traditional linear transformers that are heavy and inefficient, this switching mode power supply (SMPS) achieves up to 80% efficiency while staying cool, thanks to its modern flyback topology .
Because the module uses a high-frequency transformer and complies with international isolation standards, it provides complete electrical isolation between the dangerous high-voltage AC input and the low-voltage DC output . This ensures the safety of both your sensitive electronics and the person handling the equipment. Its encapsulated design protects against dust and moisture, making it ideal for integration into home appliances, automation panels, and commercial electronic products .
Key Features
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High Efficiency: Converts AC power with approximately 80% efficiency (up to 85% in some variants), minimizing energy waste and heat generation .
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Wide Universal Input Voltage: Accepts AC 50V ~ 277V (or 85–265V) or DC 70V ~ 390V, making it compatible with global mains standards (110V, 220V, 240V) without any jumper settings .
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Compact Isolated Design: Features a built-in high-frequency transformer that provides 1500V to 2500V galvanic isolation between the hazardous AC input and the low-voltage DC output, ensuring user safety .
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Full Protection Suite: Built-in overvoltage, overcurrent, overtemperature, overload, and short-circuit (SCP) protection prevent damage to the power supply and your devices during fault conditions .
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Low Ripple and Noise: With a 50% load ripple of just 100mV, it provides clean, stable DC power suitable for sensitive analog circuits and microcontrollers .
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Sufficient 300mA Capacity: Provides a steady 12V output with 300mA continuous current (Max 3.5W). This is enough to power low-power industrial controllers, relays, LED indicators, and most non-motorized IoT devices .
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Low Power Consumption: Features a minimal no-load power consumption of < 0.05W, making it highly efficient even when idle .
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PCB Mount Design: Features standard through-hole pins (2.54mm pitch) for easy soldering directly onto a printed circuit board (PCB), making it ideal for high-volume production and permanent installations .
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Excellent Durability: Utilizes high-quality capacitors rated for 105°C operation with a 10,000-hour lifespan, ensuring a long service life (rated 5+ years at 70°C) .
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Parallel Operation Support: Multiple modules can be used in parallel to satisfy higher current requirements in tight spaces .
Technical Specifications
| Parameter | Operating Value |
|---|---|
| Power Rating | 3.5 W |
| Output Voltage | 12 V DC (Regulated, typically ±0.2V ~ ±0.3V) |
| Output Current (Continuous) | 300 mA |
| Output Current (Peak) | 300 mA (Constant Current Mode at full load) |
| Input Voltage (AC) | 50 – 277 V (or 85 – 265 V) |
| Input Voltage (DC) | 70 – 390 V |
| Input Frequency | 47 – 63 Hz |
| Conversion Efficiency (Typical) | ≥ 80% (Up to 85%) |
| No-Load Power Consumption | < 0.05 W |
| Isolation Voltage | 1500 – 2500 VAC (Input to Output) |
| Ripple & Noise | ≤ 100 mV (at 50% load) |
| Operating Temperature | -20°C to +70°C |
| Capacitor Temperature Rating | 105°C (10,000 hours rating) |
| Test Resistance | 40 Ω |
| Dimensions (LxWxH) (Approx.) | 25mm × 18mm × 13.5mm to 35mm × 25mm × 12mm |
| Output Indicator | Green SMD LED |
| Mounting Style | PCB Mount (Through-Hole Pins) |
| Protection Features | Overvoltage, Overcurrent, Overtemperature, Overload, Short circuit |
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