SI3472A-A01-IMR

Overview

The SI3472A-A01-IMR is a Power Sourcing Equipment (PSE) controller from Skyworks Solutions, designed for IEEE 802.3bt compliant PoE applications. It supports four Ethernet ports and delivers up to 90 W per port using four-pair power transmission. The device integrates flash memory to reduce external bill of materials and PCB space while enabling faster startup times. It utilizes an industry-standard 255 mΩ current sense resistor, with options for higher thermal efficiency configurations.

Feature Summary

• Supports four Ethernet ports with up to 90 W power delivery per port under IEEE 802.3bt standards
• Integrates internal flash memory to eliminate external components and accelerate system startup
• Compatible with industry-standard 255 mΩ current sense resistors for simplified design

Applications

• PoE Network Video Recorders (NVRs)
• Set-top boxes and network gateways
• Network lighting control systems
• Enterprise wireless access points
• 5G small cell base stations

Procurement Notes

Verify the specific suffix IMR indicates the reel packaging format when sourcing. Confirm the exact part number against official Skyworks documentation to ensure compatibility with required current sense resistor values and firmware versions. Check for any recent lifecycle status updates or recommended replacement alternatives if availability is constrained.

Selection Notes

Select this component for designs requiring high-power IEEE 802.3bt PoE distribution across multiple ports. The integrated flash reduces BOM complexity compared to non-flash variants. Ensure the design accommodates the QFN package thermal requirements and matches the intended current sensing strategy using standard 255 mΩ resistors or optimized 200 mΩ alternatives for improved efficiency.

Part Context

This part belongs to the Si347x family of PoE PSE controllers, which includes single-port (Si3471), quad-port (Si3472/Si3474), and octal-port variants. These devices are engineered to provide flexible power solutions ranging from 30 W to 90 W per port, offering a balance between thermal performance and cost-effectiveness for modern networking infrastructure.

Replacement Considerations

Publicly confirmed substitute part numbers for this specific model are not available in the provided reference data. Designers should consult official Skyworks documentation for potential obsolescence notices or direct cross-references within the Si347x product line.