Product Overview
The Ebyte AM21-12W05V is a compact 12W AC-DC step-down (buck) power supply module designed for industrial IoT and embedded systems. It converts 100–250V AC mains input to a stable 5V DC output at up to 2400mA, featuring short-circuit protection, optical isolation, and a DIP package for easy PCB integration.
- Model: AM21-12W05V
- Input Voltage: 100–250V AC (wide range)
- Output Voltage: 5V DC
- Output Current: 2400mA (max)
- Output Power: 12W
- Package: DIP, 38.2 × 25.2 × 23mm
- Operating Temp: -40℃ to +85℃ (industrial grade)
- Applications: IoT gateways, wireless modules, industrial sensors, smart home, PLC auxiliary power
Technical Specifications
| Input Voltage | 100–250V AC (50/60Hz) |
| Output Voltage | 5V DC (±2%) |
| Output Current | 2400mA (max) |
| Output Power | 12W |
| Package | DIP |
| Dimensions | 38.2 × 25.2 × 23mm |
| Isolation | Optical isolation (input/output) |
| Protection | Short-circuit, over-temperature |
| Operating Temp | -40℃ to +85℃ |
| Storage Temp | -40℃ to +125℃ |
| Efficiency | ≥80% (typical) |
| Certifications | CE, RoHS |
| Updated | March 2026 |
Product Details
Wide-Range AC Input & Stable DC Output
Accepts 100–250V AC input covering global mains standards (EU/US/CN), delivering a regulated 5V/2.4A DC output with ±2% voltage accuracy. Ideal for powering wireless IoT modules, MCUs, and sensors directly from mains without an external transformer.
12 Hardware Advantages — Optical Isolation & Short-Circuit Protection
The AM21-12W05V integrates optical isolation between AC input and DC output for enhanced safety and noise immunity. Built-in short-circuit protection prevents damage during fault conditions, while the compact DIP form factor simplifies PCB layout and through-hole assembly.
Industrial Thermal Design: -40℃ to +85℃
Engineered for industrial environments with a full -40℃ to +85℃ operating range. Internal thermal management ensures stable 12W continuous output without derating across the entire temperature range — suitable for outdoor enclosures, factory floors, and harsh IoT deployments.
Ideal Applications
Dimensions & Typical Application
Resources
Download Datasheet & Schematic (PDF)Download CE / RoHS Certificates
Bulk Purchase & OEM Inquiry
FAQ
Q: Can the AM21-12W05V power Ebyte LoRa or 4G wireless modules directly?
A: Yes. The 5V/2.4A output is sufficient to power most Ebyte wireless modules (E22, E220, EC200, etc.) and their host MCUs simultaneously, eliminating the need for a separate DC power supply.
Q: Is optical isolation required for safety in AC-DC designs?
A: Yes. The AM21-12W05V provides galvanic isolation between the AC mains input and the 5V DC output, protecting downstream electronics and users from mains voltage. This meets IEC 60950 / IEC 62368 safety requirements for reinforced insulation.
Q: What happens during a short circuit on the output?
A: The module's built-in short-circuit protection automatically limits output current and shuts down to prevent damage. Normal operation resumes automatically once the fault is cleared — no manual reset required.
Q: Can this module operate in outdoor or high-temperature environments?
A: Yes. The AM21-12W05V is rated for -40℃ to +85℃ operation, making it suitable for outdoor enclosures, industrial cabinets, and harsh IoT deployments without derating.
Q: Does the AM21-12W05V support global AC input voltages?
A: Yes. The 100–250V AC wide-range input covers all major global mains standards including EU (230V), US (120V), and CN (220V), making it suitable for international product designs without hardware changes.
