5G Small Cells and IoT Gateways Powered By Silicon Labs’ PoE Portfolio


IEEE 802.3bt-compliant PoE portfolio simplifies 90 W power sourcing equipment and powered devices

Silicon Labs has introduced a comprehensive Power over Ethernet (PoE) portfolio that reduces the cost and complexity of adding 90W PoE to power sourcing equipment (PSE) and powered devices (PD). The new 90W PoE portfolio complies with the IEEE 802.3bt standard power and expands the capabilities of wireless access points and IoT wireless gateways. The portfolio’s higher power capabilities help make PoE-powered 5G small cells and digital buildings a practical reality.

The 802.3bt portfolio includes three new PSE and PD products:

  • The Si3471 PSE controller: A fully autonomous, 90W single-port 802.3bt-compliant power-sourcing solution enables easy addition of 90W power to single-port midspans or “injectors.” It automatically manages all differences associated with the 802.3bt standard. The Si3471 does not require external host MCUs, firmware downloads or software programming and is simple to configure using three digital I/O pins. Simple BOM helps reduce system cost and complexity.


  • The Si3474 quad Ethernet port PSE controller: It can power up to four 90W 802.3bt PoE ports or up to eight 30W 802.3at/af PoE ports, thus providing a versatile solution for industrial and commercial Ethernet switches and security recording equipment. The Si3474 can be operated in autonomous mode with full power on each port or in hosted mode. This enables developers to manage power through an I2C interface with a full-featured register map.


  • The Si34071 single-chip PD solution: The Si34071 delivers high power for 5G small cells, wireless access points and IoT gateways. It combines an 802.3bt interface with an integrated, high-efficiency DC-DC converter that is capable of achieving more than 90 per cent end-to-end efficiency. The chip also includes a simple, 9600-baud UART interface to the system MCU.
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“Silicon Labs’ 802.3bt PoE portfolio delivers higher power, exceptional integration and advanced features to help developers simplify their system designs while meeting stringent power, size and cost budgets,” said Brian Mirkin, vice president and general manager of power products at Silicon Labs. “Our new PoE portfolio spans both ends of the Ethernet cable, from 15 W to 90 W, giving developers flexible options for a wide range of PSE and PD applications.”

“Silicon Labs’ new 90 W solutions helped streamline our single-port PoE designs for the emerging high-power PoE market,” said Jonathan Sohnis, chief technology officer of Altronix, a global leader in power and data transmission solutions. “Silicon Labs’ excellent technical support enables us to be early in the market with the latest high-power PoE technology.”


  • Si3471 samples and production quantities are available now in small 38-pin 5mm x 7mm QFN package. The Si3471 evaluation board (EVB) is also available.
  • Si3474 samples in a 56-pin 8mm x 8mm package with an industry-standard pinout and EVBs are planned to be available in April 2020.
  • Si34071 samples in a small 32-pin 5mm x 5mm QFN package and EVBs are planned to be available in April 2020.



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