Power Switch ICs – POE / LAN IEEE 802.3af Type 1 PD interface with dc-dc converter

SI3402-B-GMR – IEEE 802.3af/at PoE Controller with DC/DC Converter – Skyworks Solutions

Simplify your Power over Ethernet designs with the SI3402-B-GMR from Skyworks Solutions. This advanced PoE controller integrates a PD interface and DC/DC converter, delivering up to 17W of power for network-connected devices. Engineered for reliability and compliance with IEEE standards, it’s ideal for space-constrained applications requiring efficient power delivery.

Key Features

• IEEE Standards: Compliant with 802.3af (PoE) and 802.3at (PoE+) protocols
• Integrated Design: Combines Powered Device (PD) controller + DC/DC converter
• Wide Voltage Range: Operates from 2.8V to 57V input
• High Efficiency: Low 2mA supply current minimizes power loss
• Robust Operation: -40°C to 85°C industrial temperature range
• Space-Saving: Surface-mount 20-QFN package (5x5mm)

Technical Details

This single-channel PoE controller features an internal power switch and supports Type 1 PoE applications. As a complete PD solution, it manages detection, classification, and under-voltage lockout (UVLO) per IEEE specifications while converting input voltage to usable DC power. The compact 20-VQFN exposed pad package ensures optimal thermal performance in high-density layouts.

Typical Applications

• VoIP phones and conference systems
• Wireless access points and security cameras
• IoT sensors and industrial control modules
• Network switches with PoE capabilities
• Building automation controllers

About Skyworks Solutions

Skyworks Solutions is a global leader in semiconductor innovation, specializing in high-performance analog and mixed-signal solutions. With decades of expertise in connectivity and power management technologies, they drive advancements in 5G infrastructure, automotive systems, and industrial IoT. Their components are renowned for rigorous quality testing and exceptional reliability in mission-critical environments.

Skyworks maintains industry-leading manufacturing standards, holding ISO/TS 16949 and ISO 14001 certifications. Their commitment to research and development ensures cutting-edge products like the SI3402 PoE controller series, which set benchmarks for power efficiency and integration in networked devices worldwide.

About PoE Controllers

Power over Ethernet controllers simplify deployment of networked devices by enabling simultaneous data and power transmission over standard CAT5/CAT6 cables. As essential components in PD (Powered Device) systems, they negotiate power requirements with PSE (Power Sourcing Equipment), provide surge protection, and regulate voltage conversion. This eliminates separate power supplies, reducing installation costs and improving system reliability.

Modern PoE controllers like the SI3402-B-GMR integrate DC/DC conversion and advanced control logic, supporting evolving standards while minimizing board space. They are fundamental to smart building infrastructure, industrial automation, and any application requiring centralized power management with remote deployment flexibility.

Packaging Options

Available in industry-standard Tape & Reel (TR) for automated assembly, with Cut Tape options for prototyping needs. PCX provides full packaging details upon request.

Frequently Asked Questions

Question: Does this IC support both 802.3af and 802.3at standards?
Answer: Yes, the SI3402-B-GMR is fully compliant with IEEE 802.3af (Type 1) and 802.3at (Type 1/PoE+) specifications.

Question: What is the maximum power output?
Answer: It delivers up to 17W, suitable for most Type 1 PoE applications.

Question: Is an external MOSFET required?
Answer: No, it includes an integrated internal power switch for simplified design.

Question: Can it operate in industrial environments?
Answer: Absolutely, with its -40°C to 85°C operating range and robust construction.

Question: Where can I find the full datasheet?
Answer: Access the complete technical documentation: SI3402-B-GMR Datasheet

Question: How quickly can PCX ship this component?
Answer: Most orders ship same-day from our certified stock, with global delivery options.

Product images are representational; refer to datasheet for exact specifications.

Streamline your PoE deployment with guaranteed authentic components! Order SI3402-B-GMR today for immediate shipment and dedicated technical support from PCX.