Raspberry Pi Releases PoE+ HAT That Delivers More Power and Runs Cooler

The Raspberry Pi foundation released the improved version of their Power-over-Ethernet solution - Pi PoE+ HAT (plus version) with more power delivering capability and better thermal management.
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Raspberry Pi PoE+ HAT. Source: Raspberry Pi

The Raspberry Pi foundation recently announced in a blog post the release of improved version of their Power-over-Ethernet solution – Pi PoE+ HAT (plus version). The new version supersedes the older Pi PoE HAT. The new version implements 802.3at PoE+ standard, and thus can deliver more power. The designers have made careful changes to handle this extra power and yet run it cooler. The module costs $20 at the RPi store.

The original version PoE HAT will continue in production, but like everyone in the electronic industry, Raspberry Pi is also finding it difficult to manage supply chains due global semiconductor shortage. The PoE+ HAT will be available on stores starting from June this year.

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Raspberry Pi PoE+ HAT top view. Source: Raspberry Pi
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Raspberry Pi PoE+ HAT running. Source: Raspberry Pi
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Raspberry Pi PoE HAT (old version). Source: Raspberry Pi

The original PoE HAT used the 802.3af PoE standard which delivers a maximum power of 13W. But the newer standard can deliver up to 25W. This will allow designers to use more capable USB devices attached to the Raspberry Pi SBCs. A comparison table is provided by RPi.

PoE HATPoE+ HAT
Standards supported802.3af802.3af, 802.3at
Output voltage5V5V
Maximum output current2.5A5A
Maximum power15.4W25.5W
FanYesYes
Current senseNoYes
Transformer designWire-woundPlanar
PCB4 layers, 2oz copper4 layers, 2oz copper
Price$20$20
Compatible withRaspberry Pi 3B+, 4BRaspberry Pi 3B+, 4B
PoE and PoE+ comparison

Delivering more power requires better thermal management. RPi engineers have achieved this by using the Microchip PD70224ILQ ideal diode in the new design. The new transformer is interesting too. It uses the Bourns’s planar transformer core. This is essentially a split ferrite core through which a PCB with winding traces is inserted. This makes the design compact and neat, unlike the previous one.

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Bourns Planar Transformer
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Raspberry Pi PoE+ HAT delivering 2.5A. Source: Raspberry Pi

PoE+ HAT Specifications

  • Standard: IEEE 802.3at-2003 PoE
  • Input voltage: 37-57 V DC, Class 4 device
  • Output power: 5 V DC/4 A
  • Cooling: 25 mm × 25 mm brushless fan delivering 2.2 CFM for processor cooling
  • Features: Fully isolated switched-mode power supply, Fan control
  • Operating temperature: 0 °C to +50 °C
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Raspberry Pi PoE+ HAT mechanical diagram. Source: Raspberry Pi

Links

  1. Raspberry Pi blog post
  2. Buy PoE+ HAT
  3. PoE+ Specifications Document PDF
  4. Buy PoE HAT
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Vishnu Mohanan
Founder and Chief Editor at CIRCUITSTATE Electronics
Articles: 36

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