Power Over Ethernet IC by Skyworks Solutions (14 more products)

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Si3473B-A01-IM Image

The SI3473B-IM from Skyworks Solutions is a 2-Pair Octal-Port Power Sourcing Equipment Controller IC that has been designed for use in end spans (switches) and midspans (injectors). It requires an input voltage of 50 - 57 V. This controller manages eight independent ports, each incorporating the necessary detection and classification features as per IEEE standards. It includes power under-voltage lockout, output current limit, short-circuit protection, and thermal overload detection. This controller offers autonomous operation or control via an I2C host interface and features emergency shutdown support with port priority control. It provides enhanced design flexibility with per-port current and voltage monitoring, multi-point detection, programmable power MOSFET gate drive control, and a configurable watchdog timer for failsafe operation. This controller features a maskable interrupt pin, ensuring reliable operation by alerting the host of various status and fault events. It is available in a surface-mount package that measures 8 x 8 mm and is ideal for power-over-ethernet (PoE) switches, IP phone systems, ruggedized and industrial switches, and multiport PoE injector applications.

Product Specifications

Product Details

  • Part Number
  • Manufacturer
    Skyworks Solutions
  • Description
    2-Pair Octal-Port Power Sourcing Controller IC for Switching Applications


  • Number of Ports
  • Input Voltage
    50 to 57 V
  • Output Current
    0.017 to 0.025 A
  • Output Power
    45 W
  • Communication Standards
    IEEE 802.3at, IEEE 802.3af, IEEE 802.3bt
  • RoHS Compliant
  • Temperature Operating Range
    -40 to 85 Degree C
  • Industry
  • Applications
    Power over Ethernet Switches, IP Phone Systems, Ruggedized and Industrial Switches
  • Dimension
    8 x 8 mm
  • Package Type
    Surface Mount
  • Package

Technical Documents