## Overview

The CUI Inc PRM3W-E12-S5-S is a compact, high-efficiency switching AC-DC power module designed for low-power applications. It provides regulated 5 V DC output from universal AC input, delivering up to 3 W of continuous output power. Its isolated design, wide input voltage range, and small form factor make it suitable for embedded systems, industrial control, and instrumentation.

## Device Architecture

* Type: AC-DC switching power module
* Output: Regulated 5 V DC
* Continuous power rating: 3 W
* Input voltage range: 90 VAC to 264 VAC (47–63 Hz)
* High-efficiency switching topology with internal transformer isolation
* Integrated overvoltage, overcurrent, and thermal protection
* Single-output design with low ripple and noise

## Electrical Specifications

* Nominal output voltage (VOUT): 5 V DC ±2%
* Output current (IOUT): 0–600 mA continuous
* Maximum output power: 3 W
* Input voltage range: 90–264 VAC, 127–370 VDC
* Input frequency: 47–63 Hz
* Line regulation: ±1% typical
* Load regulation: ±2% typical
* Output ripple and noise: 50 mV peak-to-peak typical at full load
* Efficiency: 70–75% typical at 230 VAC, full load

## Protection and Compliance

* Overcurrent protection: Hiccup mode or foldback design
* Overvoltage protection: Shuts down or limits output to safe levels
* Overtemperature protection: Auto-recovery on cooling
* Isolation voltage: 3000 VAC input to output
* Safety certifications: UL/IEC/EN 62368-1 compliant
* Conducted and radiated EMI meets CISPR 32 Class B limits

## Thermal and Mechanical Characteristics

* Operating temperature range: -20°C to +70°C
* Storage temperature range: -40°C to +85°C
* Cooling: Convection only, no external fan required
* Derating: Output current reduced above 50°C to maintain safe operation
* Package type: SIP (Single Inline Package) with through-hole mounting
* Dimensions: 1.0 × 0.8 × 0.6 inches (approximate)
* Pin configuration: Standard 5-pin layout for input, output, and ground

## Performance Characteristics

* Low standby power consumption (<0.3 W typical)
* Stable output under varying input voltages and load conditions
* Fast transient response for dynamic load changes
* Low conducted EMI suitable for sensitive applications
* High isolation allows use in medical, industrial, and measurement systems

## Applications

* Embedded microcontroller and FPGA systems
* Industrial automation and process control
* Instrumentation and measurement equipment
* IoT and communication devices requiring low-power DC supply
* Battery-powered systems with AC adapter interface
* Low-power consumer electronics requiring safety isolation

## Key Advantages

* Wide AC input range for global compatibility
* Compact SIP footprint saves PCB space in embedded designs
* Regulated 5 V output with low ripple ensures reliable operation of digital circuits
* Integrated protection features enhance system safety and reliability
* High isolation and safety certifications allow use in industrial and commercial applications
* High efficiency reduces heat generation and improves energy savings
* Low noise and EMI make it suitable for sensitive analog and digital systems

The PRM3W-E12-S5-S module delivers a compact, efficient, and reliable AC-DC conversion solution for low-power electronic systems. Its regulated output, robust protection features, high isolation, and compliance with safety and EMI standards make it ideal for industrial, embedded, and instrumentation applications where space and efficiency are critical.