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Green circuit board with 40-pin header, USB-A port, Ethernet jack and cooling fan

WaveShare

WaveShare POE HAT (C) 40-pin Raspberry Pi 3B+/4B computer accessory

SKU CH-FTKN-JJ9J2

Adds Power over Ethernet to Raspberry Pi 3B+ and 4B via 40-pin header with 12 V and 5 V outputs plus active cooling fan

  • CPU TypeOther
  • Compatible with Raspberry Pi 3B+ and 4B via 40-pin GPIO header
  • Powers the board through IEEE 802.3af/at compliant network connection
  • Fully isolated switched-mode supply delivers stable 12 V and 5 V outputs
  • Extra USB-A port lets you run additional peripherals from the HAT
  • Onboard high-speed fan provides active cooling for better heat dissipation

PoE HAT for Raspberry Pi 3B+ and 4B

This accessory adds Power over Ethernet to Raspberry Pi 3B+ and 4B boards using the standard 40-pin GPIO header. It draws power from an IEEE 802.3af/at-compliant network, removing the need for a separate USB-C supply. Builders running headless servers, remote sensors or clustered nodes can deploy the board wherever a single Ethernet cable reaches.

Sustained load with active cooling

An onboard high-speed fan spins continuously to move air across the Raspberry Pi processor and the HAT’s own power circuitry. The fully isolated switched-mode supply maintains stable 12 V and 5 V rails even when the CPU runs at full tilt for long periods. Thermal throttling is reduced compared with passive-only mounting, so compute-heavy workloads hold higher frequencies for longer.

Build quality and daily connectivity

The HAT sits directly on the 40-pin header with no extra cabling, keeping the stack height low for standard cases. A USB-A port on the board delivers 5 V to peripherals such as drives or cameras, letting the single Ethernet feed power the whole assembly. Isolated SMPS design protects the Pi from ground loops and voltage spikes on the network side.

Highlights

  • Compatible with Raspberry Pi 3B+ and 4B via 40-pin GPIO header
  • Powers the board through IEEE 802.3af/at compliant network connection
  • Fully isolated switched-mode supply delivers stable 12 V and 5 V outputs
  • Extra USB-A port lets you run additional peripherals from the HAT
  • Onboard high-speed fan provides active cooling for better heat dissipation

Specifications

CPU TypeOther

Questions about this item

How much heat does the onboard fan move when the HAT runs continuously?

The HAT includes an active cooling fan that runs from the isolated SMPS to keep the Raspberry Pi and the board itself cooler during all-day operation.

Which Raspberry Pi models and GPIO layout does this HAT require?

It fits the standard 40-pin GPIO header on a Raspberry Pi 3B+ or 4B and draws its power from the Ethernet cable.

Will the 12 V and 5 V outputs on the HAT work with older USB peripherals I already own?

The USB-A port supplies 5 V for legacy devices while the 12 V rail can power additional hats or accessories that accept that voltage.

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