SI3402-B-GMR

Overview

The SI3402-B-GMR is a single-channel Power over Ethernet (PoE) Powered Device controller and DC-DC converter compliant with IEEE 802.3af and 802.3at standards. It operates within a supply voltage range of 2.8 V to 57 V, supporting up to 17 W of power. The device features an internal switch with a maximum on-resistance of 1.3 Ohms and includes current limiting set at 680 mA. Designed for surface-mount installation in a 20-QFN package, it functions reliably across temperatures from -40°C to +85°C while consuming only 2 mA of operating current.

Feature Summary

• Integrates PoE interface logic with a synchronous DC-DC converter for compact Powered Device designs
• Supports both Type 1 (802.3af) and Type 2 (802.3at) classification protocols
• Includes internal high-side switch with defined current limiting capabilities

Applications

• IEEE 802.3af compliant Powered Devices
• IEEE 802.3at compliant Powered Devices
• Non-isolated PoE PD board designs

Procurement Notes

Verify the specific suffix 'GMR' corresponds to the reel or cut tape packaging format required for your assembly line. Confirm RoHS compliance status through official Skyworks documentation prior to procurement. Ensure the 20-QFN footprint matches your PCB layout constraints. Cross-reference the manufacturer part number directly with Skyworks Solutions Inc. to avoid counterfeit components.

Selection Notes

Select this component when designing a single-channel PoE Powered Device requiring integrated DC-DC conversion. It is suitable for applications needing support for both 802.3af and 802.3at standards within a small QFN footprint. Consider the 680 mA current limit and 1.3 Ohm on-resistance for power budget calculations. Verify thermal performance requirements against the specified -40°C to +85°C operating range.

Part Context

This part belongs to the Si3402 series of PoE controllers manufactured by Skyworks Solutions Inc. It serves as a complete solution for Powered Devices, combining classification logic and power conversion. The series supports standard PoE implementations, offering a compact alternative to discrete solutions. Related development tools include the SI3402B-EVB evaluation board for design verification.

Replacement Considerations

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