Electronic Component Solutions

New Power over Ethernet ICs

Silicon Labs released two new Power over Ethernet (PoE) Powered Device (PD) families delivering best-in-class integration and efficiency for a wide range of Internet of Things (IoT) applications. Silicon Labs’ Si3406x and Si3404 families include all necessary high-voltage discrete components on a single PD chip. The new PD ICs support IEEE 802.3 at PoE+ power capabilities, flexible power conversion options exceeding 90 percent efficiency, robust sleep/wake/LED support modes and superior EMI immunity. These capabilities help developers reduce system cost and time to market for high-power, high-efficiency PoE PD applications.


  • Supports non-isolated and isolated switching topologies
  • Fully integrated high-voltage devices
  • Two complete diode bridges
  • Transient voltage suppressor
  • Switching regulator driver FET
  • Current-limited hot swap switch
  • Comprehensive protection circuitry
  • Transient over-voltage protection
  • Under voltage lockout
  • Thermal shutdown protection
  • Fold back current limiting
  • Low-EMI slew rate control
  • Secondary sync FET driver
  • Type 2 present indicator
  • Automatic maintain power signature (MPS) support
  • PWM switching frequency control
  • Sleep mode control
  • External hotswap and switching FET modes (Si34061)
  • Auxiliary adapter power sense (Si34061)
  • Advanced Sleep/Wake modes with LED (Si34062)
  • Transformer winding efficiency enhancer (Si34061, 62)


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