SI3459-B02-IMR Equivalent & Substitute Parts

Part Overview

The SI3459-B02-IMR is a Power Over Ethernet (PoE) Controller manufactured by Skyworks Solutions Inc., designed for 8-channel PSE (Power Sourcing Equipment) applications supporting 802.3af and 802.3at standards. This component is classified as Not For New Designs, indicating it has reached end-of-life status. Finding equivalent or substitute parts is necessary for legacy system maintenance, repair operations, and inventory replenishment where original stock is depleted.

Substiute Parts

SI3459-B02-IMR

Skyworks Solutions Inc.In Stock: 7626SI3459-B02-IMR Datasheet

Current PartRFQ

SI3473A-A01-IMR

Skyworks Solutions Inc.In Stock: 1129SI3473A-A01-IMR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI3459-B02-IMR is determined by the following critical parameters:

• Channel Configuration: 8-channel architecture for multi-port PoE controller applications
• Package Compatibility: 56-VFQFN Exposed Pad form factor for direct PCB integration
• PoE Standards Support: Minimum support for 802.3af and 802.3at protocols
• Operating Temperature Range: -40°C to 85°C operational envelope
• Mounting Type: Surface Mount technology for automated assembly

The SI3473A-A01-IMR qualifies as a substitute based on matching channel count, identical package specification, overlapping PoE standard support (with extended 802.3bt capability), and compatible operating temperature range. Both components are manufactured by Skyworks Solutions Inc. and share the same physical footprint.

Parameter Comparison

Engineering Selection Recommendations

The SI3473A-A01-IMR is the manufacturer-recommended substitute for the SI3459-B02-IMR. Selection between these components should be based on the following criteria:

SI3459-B02-IMR: Use only for legacy system maintenance and repair where original component specifications are mandatory and existing inventory is available. This part is not recommended for new designs.

SI3473A-A01-IMR: Select for new designs, system upgrades, and long-term production support. This component carries Active product status, ensuring continued availability and manufacturer support. It provides extended PoE standard coverage (802.3bt) and includes integrated internal switches, offering enhanced functionality within the same physical footprint.

Both components share identical package geometry, operating temperature range, and channel count, enabling direct substitution at the PCB level. However, differences in supply voltage requirements (44V-57V versus 3V-3.6V) and internal architecture necessitate verification of power supply design and control signal compatibility in the target application.

Frequently Asked Questions (FAQ)

Q: Can SI3473A-A01-IMR directly replace SI3459-B02-IMR on existing PCBs?

A: Physical footprint compatibility is confirmed (56-VFQFN Exposed Pad). However, the supply voltage specifications differ significantly (44V-57V versus 3V-3.6V). PCB power supply design and control signal routing must be evaluated before substitution.

Q: What are the key differences between these two controllers?

A: The SI3473A-A01-IMR adds 802.3bt standard support, includes integrated internal switches (versus none in SI3459-B02-IMR), and operates on lower supply voltage (3V-3.6V). Both maintain 8-channel architecture and identical package specifications.

Q: Is the SI3473A-A01-IMR suitable for legacy system repairs?

A: Yes. The SI3473A-A01-IMR is Active status and widely available. Its identical channel count, package, and operating temperature range make it suitable for legacy system maintenance, provided power supply and control interface compatibility is confirmed.

Q: Are there any certifications or compliance differences?

A: Both components carry MSL 3 (168 Hours) moisture sensitivity rating. ECCN and HTSUS classifications differ due to architectural changes and updated regulatory frameworks. Verify compliance requirements for your specific application and region.

Q: What is the significance of the 56-VFQFN package specification?

A: This denotes a 56-pin Very Fine Pitch Quad Flat No-Lead package with exposed thermal pad, 8mm x 8mm footprint. Both components use this identical specification, ensuring mechanical and thermal compatibility on the PCB.