SI3404-A-GMR

Overview

The SI3404-A-GMR is a fully integrated IEEE 802.3 Type 1 compliant Power over Ethernet (PoE) Powered Device (PD) interface and high-efficiency switching regulator. It converts high-voltage power from 10/100/1000BASE-T Ethernet connections into regulated low-voltage outputs. The device integrates a transient surge suppressor, current-mode controlled DC-DC converter, hot-swap switch, and switching FET. It supports isolated or non-isolated flyback and buck topologies with tunable switching frequency for emissions control.

Feature Summary

• Integrates PoE PD interface and high-efficiency switching regulator in a compact footprint
• Supports isolated and non-isolated flyback and buck converter topologies
• Includes integrated transient surge suppressor and hot-swap switch functions
• Features tunable switching frequency to optimize electromagnetic interference performance

Applications

• Voice over IP telephones
• Wireless access points
• Security and surveillance IP cameras

Procurement Notes

Verify the specific suffix 'A' against official Skyworks documentation to confirm pinout compatibility and electrical characteristics relative to other Si3404 variants. Ensure the component meets the required environmental operating temperature range of -40°C to +85°C for the target deployment environment.

Selection Notes

Select this component for designs requiring a single-chip solution for Type 1 PoE applications. It minimizes external bill of materials by integrating the controller, FETs, and protection circuits. Consider the 20-pin QFN package constraints and thermal requirements when designing the PCB layout for optimal heat dissipation.

Part Context

This part belongs to the Si3404 series, which provides integrated PoE solutions. It is distinct from evaluation kits like the SI3404FB3V3KIT and differs from higher-power variants such as the SI34061. The device is manufactured by Skyworks Solutions, Inc., continuing the lineage of Silicon Labs PoE technologies.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.