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Product Detailed Parameters
- Description：IEEE 802.3BT FOUR ETHERNET PORT
- Series：-
- Mfr：Skyworks Solutions Inc.
- Package：Tape & Reel (TR)
- Type：Controller (PSE)
- Number of Channels：4
- Power - Max：-
- Internal Switch(s)：Both
- Auxiliary Sense：No
- Standards：802.3at (PoE+), 802.3af (PoE), 802.3bt
- Voltage - Supply：50V ~ 57V
- Current - Supply：17mA
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：56-VFQFN Exposed Pad
- Supplier Device Package：56-QFN (8x8)
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Overview
The SI3474B-A02-IMR is a fully programmable Power Sourcing Equipment (PSE) controller designed for IEEE 802.3af, 802.3at, and 802.3bt standards. It supports four Ethernet ports with a total output power of 90W. The device integrates a 200mΩ current sense resistor and operates within a 50V to 57V supply range. Packaged in a 56-pin QFN (8x8mm) format, it provides comprehensive management for high-power PoE applications.
Feature Summary
- Supports IEEE 802.3bt Type 4 power delivery for up to 90W per port
- Integrates precision current sensing components for accurate power monitoring
- Fully programmable architecture allows customization of power management parameters
Applications
- High-power PoE switches and injectors
- Wireless access points requiring Type 4 power
- Outdoor network infrastructure equipment
- Digital signage and video conferencing systems
Procurement Notes
Verify the specific suffix A02-IMR to confirm the integrated 200mΩ current sense resistor configuration. Ensure compatibility with the 56-QFN package dimensions during PCB layout. Confirm that the design adheres to the humidity sensitivity requirements specified in the datasheet for proper storage and reflow processing.
Selection Notes
Select this component when designing systems requiring full 802.3bt compliance with integrated sensing. Compare against the SI3474A variant which utilizes a different internal resistance value. Ensure the application requires four independent channel control and fits within the thermal constraints of the QFN-56 package.
Part Context
This part belongs to the Skyworks SI3474 family of PSE controllers. It is distinct from the SI3474A-A01-IMR which features a 255mΩ resistor. The series targets modern high-density networking hardware needing efficient power distribution over standard Ethernet cabling.
Replacement Considerations
The SI3474A-A01-IMR is a related variant but uses a 255mΩ sense resistor instead of 200mΩ. Verify if the difference in internal resistance impacts the system's power calculation accuracy before substituting.
