SI3459-B04-IMR

Overview

The SI3459-B04-IMR is a fully programmable eight-port power management controller designed for IEEE 802.3at-compliant Power Sourcing Equipment (PSE). It supports PoE applications with a maximum port power of 30W. The device operates within a supply voltage range of 37V to 57V and functions reliably across an operating temperature range of -40°C to +85°C. It utilizes a 56-pin QFN package measuring 8x8 mm, suitable for surface mount installation.

Feature Summary

• Fully programmable eight-port architecture for comprehensive power management
• Compliance with IEEE 802.3at standards for PoE PSE implementations
• Supports high-power ports up to 30W per channel

Applications

• IEEE 802.3at compliant Power Sourcing Equipment systems
• Multi-port PoE network infrastructure controllers
• Power management units for LAN applications requiring eight-channel control

Procurement Notes

Verify the specific suffix 'B04-IMR' against official Skyworks documentation to confirm package type and tape-and-reel configuration. Confirm current lifecycle status as distributors may list obsolete or NRND variants. Ensure compatibility with required PCB footprint dimensions for the 56-QFN package before procurement.

Selection Notes

Select this component when designing systems requiring exactly eight independently managed PoE ports under the 802.3at standard. Consider the 37V to 57V input requirement for upstream power availability. Evaluate thermal management needs given the 30W per-port capability and compact QFN packaging constraints in dense layouts.

Part Context

This part belongs to the Si3459 family of power switch ICs from Skyworks Solutions. It serves as a specialized controller for managing power distribution over Ethernet cables. The family includes variants with different pin counts and configurations, such as the SI3459-B02-IM, tailored for various port densities and form factors.

Replacement Considerations

Check for direct substitutes like the SI3459-B02-IM if pinout compatibility allows. Verify functional equivalence regarding port count and IEEE standard support. Consult Skyworks for updated recommendations if the current part is marked Not Recommended for New Designs.