SI3402-A-GM

Overview

The SI3402-A-GM is a Power over Ethernet (PoE) Powered Device controller and DC-DC converter compliant with IEEE 802.3af standards. It operates within a supply voltage range of 2.8 V to 57 V and supports a maximum output power of 15 W. The device features an internal switch with a maximum on-resistance of 1.3 Ohms and a current limit of 680 mA. It functions in temperatures from -40°C to +85°C and is housed in a 20-QFN package.

Feature Summary

• IEEE 802.3af standard-compliant PoE interface
• Integrated DC-DC converter for low-voltage regulation
• Internal power switch with current limiting

Applications

• Powered Device (PD) implementations in LAN infrastructure
• Legacy pre-standard PoE system integration
• Network endpoint devices requiring integrated power management

Procurement Notes

This component is obsolete and no longer manufactured by Skyworks Solutions Inc. Verification of availability is restricted to existing stock or secondary market sources. Designers must confirm end-of-life status and ensure compliance with long-term supply requirements before procurement.

Selection Notes

Engineers should consider the Si3402-B-GM as a pin-compatible replacement, which maintains IEEE 802.3 standard compliance while supporting legacy pre-standard PoE. The selection process requires evaluating the obsolescence of the A-series against the functional equivalence of the B-series for new designs.

Part Context

The SI3402-A-GM belongs to the Si3402 series of power switch ICs designed for PoE applications. It serves as a foundational solution for integrating power delivery into network equipment, preceding later iterations that expanded compatibility with updated industry standards.

Replacement Considerations

The Si3402-B-GM is documented as a pin-compatible replacement for the obsolete Si3402-A.