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Green circuit board with Ethernet port, GPIO header, and small cooling fan

SMUGDESK

SMUGDESK PoE HAT (B) 802.3af Switch Module for Raspberry Pi 3B+ 4B

SKU CH-NB4D-TTZGK

Adds 802.3af Power over Ethernet with a temperature-controlled fan to Raspberry Pi 3B+ and 4B boards

  • Powers Raspberry Pi through Ethernet cable using 802.3af standard
  • Converts 48V PoE input to stable 5V for full-load operation
  • Built-in fan with automatic speed control keeps board cool
  • Stacks directly onto GPIO header with no extra wiring needed
  • Isolated circuit protects against overvoltage, overcurrent and short circuits

Dedicated PoE HAT for Pi 3B+ and 4B

This expansion board adds IEEE 802.3af Power over Ethernet support to Raspberry Pi 3 Model B+ and Raspberry Pi 4 Model B boards. It draws 48 V DC from the network cable and converts it to the stable 5 V the Pi requires. The module is built for clusters, home servers, monitoring nodes, NAS units and smart gateway projects.

Requires compliant PoE switch or injector

The HAT plugs directly onto the Pi GPIO header with no extra wiring. It must be paired with an 802.3af PoE switch or passive PoE injector and a CAT5e or CAT6 cable. The onboard isolated DC-DC circuit delivers enough current for the Pi at full load plus attached USB peripherals, SD cards and sensors.

Integrated fan with automatic speed control

A miniature cooling fan is built into the stacked assembly. An onboard temperature sensor adjusts fan speed in real time to keep the Pi running at lower temperatures. The power conversion stage includes over-voltage, over-current and short-circuit protection for safer operation.

How it compares

Measured against everything we stock in Switch Modules, Transceivers & Add-Ons, at today’s prices. Recalculated every night.

Price $31.99
Cheaper than about 76% of the 1,517 comparable items (median $68.99).

Specifications

No published specifications for this item yet.

Questions about this item

What IEEE standard does this PoE HAT require from the switch or injector?

It requires a source compliant with the IEEE 802.3af standard to deliver 48V DC over the Ethernet cable.

How does the onboard fan behave during continuous operation?

The miniature fan runs under automatic temperature control, adjusting its speed to keep the Raspberry Pi cool under sustained load.

Which Raspberry Pi models does this HAT physically fit?

It plugs directly onto the GPIO header of a Raspberry Pi 3 Model B+ or Raspberry Pi 4 Model B without extra wiring.

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