The Professional 12V 400mA PCB-Mount Power Supply is an enclosed, miniature step-down switching regulator (SMPS) designed for direct integration onto printed circuit boards. It features complete galvanic isolation between the hazardous high-voltage AC mains input and the safe, low-voltage DC output rail.
With a stable 12 V output, this module is specifically engineered to power 12 V electromagnetic relays, cooling fans, and communication nodes, while providing an ideal front-end rail that can be stepped down further (via local LDOs) for sensitive microcontrollers like the ESP32 or STM32.
Industrial Galvanic Isolation: Keeps high-voltage AC surges completely isolated from your low-voltage logic side, preventing catastrophic microcontroller failures.
Ultra-Compact Open/Encapsulated Design: Miniature footprint optimized specifically to minimize board space on custom PCB prototype layouts.
Wide Input Tolerance: Robust design reliably handles inputs from 85V AC up to 265V AC, preventing system drops during local voltage fluctuations and brownouts.
Low Electromagnetic Interference (EMI): Integrated filtering ensures exceptionally low output ripple and noise, keeping analog sensor readings steady.
Comprehensive Safety Suite: Built-in safeguards protect against output short-circuits, over-current conditions, and overheating.
| Feature | Specification |
| Input Voltage Range | 85V to 265V AC (50/60Hz) or 100V to 370V DC |
| Output Voltage | 12V DC (pm 0.1VAccuracy) |
| Maximum Output Current | 400mA (0.4 A) |
| Peak Current Capacity | Up to 500mA (Short duration bursts) |
| Rated Output Power | 4.8 Watts |
| Output Ripple & Noise | <60 mVp-p} |
| Efficiency | ge 80 %typical |
| Pin Pitch | PCB mountable solder pins |
AC Inputs (Pins L / N): Connect directly to your 220 VAC Live and Neutral household or industrial supply lines. Polarity is reversible at the input.
DC Outputs (Pins +V / -V): Delivers the regulated +12 VDC power rail.
The Smart Hierarchy Layout: For professional IoT applications, feed the 12 V output directly to your boards 12Vrelay coils. Simultaneously, tap into this 12 Vline and feed it into an AMS1117-3.3V or LM2596 step-down regulator to power your microcontrollers. This dual-stage layout shields your digital processors from inductive relay switching noise!
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