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HUXUAN AC to DC 5V/12V Isolated Buck Converter Power Module
HUXUAN AC to DC 5V/12V Isolated Buck Converter Power Module
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HUXUAN Mini Isolated Buck Converter – AC to DC 5V / 12V Power Supply Module
This compact HUXUAN isolated switch-mode power supply module is an ideal solution for DIY electronics projects, home automation, smart home devices, and embedded systems. It steps down AC mains voltage (50V–277V AC or 70V–390V DC) to a stable, regulated DC output — available in either 5V 700mA or 12V 300mA — delivering up to 3.5W of output power at approximately 80% efficiency. Its isolated design ensures electrical safety between input and output, making it well-suited for integration into enclosures and custom PCB builds.
With built-in overvoltage, overcurrent, overtemperature, and short-circuit protection, this module is designed for long-term, reliable operation. Capacitors rated at 105°C for 10,000 hours mean this module can last 20–50 years under normal room-temperature conditions. The green LED output indicator provides a clear at-a-glance status check.
Made in Mainland China.
Key Features
- ⚡ Dual output options: DC 5V @ 700mA or DC 12V @ 300mA
- 🔌 Wide input range: AC 50V–277V / DC 70V–390V — works globally
- 🛡️ Fully isolated design: Electrical isolation between input and output for safe integration
- 🔒 Multi-layer protection: Overvoltage, overcurrent, overtemperature & short-circuit protection
- 💡 Green LED output indicator for quick visual status confirmation
- 🔋 Ultra-low no-load power: <0.05W — energy efficient standby
- 📐 Parallelable outputs: Multiple modules can run in parallel for higher current applications
- 🌡️ Operating temperature: -20°C to +70°C
- ⏱️ Long service life: Capacitors rated 105°C / 10,000 hours (~20–50 years at room temperature)
- 📦 Compact, board-mount form factor — easy to integrate into custom projects
Technical Specifications
DC 5V 700mA Version
| Input Voltage | AC 50V–277V / DC 70V–390V |
| Output Voltage | 5V ±0.15V (no load to full load) |
| Output Current | 5mA–700mA (constant current at full load) |
| Output Power | 3.5W (efficiency ~80%) |
| Full Load Power | <4W |
| No-Load Power | <0.05W |
| Ripple (50% load) | 60mV |
| Test Resistance | 7Ω (4.9V) |
| Output Indicator | Green LED |
| Working Temperature | -20°C to +70°C |
DC 12V 300mA Version
| Input Voltage | AC 50V–277V / DC 70V–390V |
| Output Voltage | 12V -0.05V/+0.3V (no load to full load) |
| Output Current | 12mA–300mA (constant current at full load) |
| Output Power | 3.5W (efficiency ~80%) |
| Full Load Power | <4W |
| No-Load Power | <0.05W |
| Ripple (50% load) | 100mV |
| Test Resistance | 40Ω (12V) |
| Output Indicator | Green LED |
| Working Temperature | -20°C to +70°C |
What's in the Box
- 1× AC 220V to DC 5V or DC 12V Isolated Power Supply Module
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For more guidance on electrical safety standards for power supply modules, visit the U.S. Consumer Product Safety Commission – Electrical Safety.
Learn more: Power supply
Frequently Asked Questions
Q: What is the difference between the DC 5V 700mA and DC 12V 300mA versions of this buck converter module?
A: Both modules share the same input range (AC 50V–277V / DC 70V–390V) and 3.5W output power rating. The DC 5V 700mA version outputs 5 volts at up to 700mA — ideal for microcontrollers, Arduino, ESP8266/ESP32, and USB-powered devices. The DC 12V 300mA version outputs 12 volts at up to 300mA, making it suitable for LED strips, small motors, relays, and sensors requiring 12V.
Q: Can I run multiple modules in parallel to get more current output?
A: Yes. The HUXUAN isolated buck converter is designed to support parallel operation. Multiple modules of the same output voltage can be connected in parallel to increase total available current, allowing you to scale the power supply for higher-demand applications without requiring a single larger unit.
Q: Is this module safe to connect directly to 220V mains power?
A: This module is specifically designed for direct connection to AC mains within its rated input range (AC 50V–277V). The isolated design provides electrical separation between the high-voltage input and the low-voltage DC output. However, always exercise caution when working with mains voltages, follow local electrical codes, and house the module in an appropriate insulated enclosure to prevent accidental contact.
Q: What protection features does this power supply module include?
A: The module includes built-in overvoltage protection, overcurrent protection, overtemperature protection, and short-circuit protection. It also enters a constant current mode at full load, helping to safeguard connected devices and extend the life of the module under demanding operating conditions.
