SI3401-D-GM

Overview

The SI3401-D-GM is a single-channel Power over Ethernet (PoE) controller designed for IEEE 802.3af compliant Powered Device (PD) applications. It integrates a DC/DC converter and internal switches to manage power delivery efficiently. The device operates within a supply voltage range of 2.8V to 57V and supports a maximum power output of 15W. It functions reliably across an industrial temperature range of -40°C to 85°C. The component is housed in a compact 20-VQFN package with a bare pad, measuring 5x5 mm, suitable for surface-mount installation.

Feature Summary

• Compliant with IEEE 802.3af PoE standards for reliable data and power transmission
• Integrates DC/DC conversion capabilities with internal switching elements
• Supports Powered Device (PD) classification and management functions

Applications

• IEEE 802.3af Powered Device implementations
• Network infrastructure equipment requiring integrated PoE control
• Industrial systems operating in extended temperature environments

Procurement Notes

Verify the specific suffix 'D' against current manufacturer documentation, as it may indicate legacy status or specific packaging variations. Confirm availability through authorized distributors, noting that this part number may be discontinued or subject to last-time buy restrictions. Ensure compatibility with existing PCB footprints for the 20-QFN package before procurement.

Selection Notes

Select this component for designs requiring a fully integrated 802.3af PD solution with minimal external passive components. Consider the 20-QFN footprint constraints and thermal requirements for the 15W power handling capability. Evaluate the 2.8V to 57V input range against the specific network interface specifications to ensure proper operation under all standard PoE conditions.

Part Context

The SI3401 series represents Silicon Labs' portfolio of integrated PoE controllers aimed at simplifying Powered Device design. This specific model focuses on single-channel applications adhering to the earlier 802.3af standard, distinguishing it from higher-power 802.3at or 802.3bt counterparts. It serves as a foundational component for network endpoints requiring standardized power negotiation and delivery.

Replacement Considerations

Check for direct pin-to-pin replacements within the SI3400/SI3401 family or newer generations like the SI3402 if 802.3at support is required. Verify that any substitute maintains the 20-QFN(5x5) package dimensions and electrical characteristics compatible with 802.3af protocols.