Today we’re announcing the next generation of our Power over Ethernet (PoE) HAT. Compared to its predecessor, the Raspberry Pi PoE+ HAT delivers more power, implementing the 802.3at PoE+ standard; and it runs cooler, thanks to various design improvements. Best of all, we’ve been able to keep the original affordable price of $20.
The original PoE HAT implements the 802.3af standard, and can deliver a guaranteed minimum of 13W to the Raspberry Pi. This is enough to power a Raspberry Pi 4 at maximum load, but not quite enough to power the hungriest USB peripherals at the same time.
The PoE+ HAT implements the 802.3at standard. When used with a compatible switch or injector this means it can deliver up to 25W, as you can see from this comparison table.
|PoE HAT||PoE+ HAT|
|Standards supported||802.3af||802.3af, 802.3at|
|Maximum output current||2.5A||5A|
|PCB||4 layers, 2oz copper||4 layers, 2oz copper|
|Compatible with||Raspberry Pi 3B+, 4B||Raspberry Pi 3B+, 4B|
The new components:
A New Diode Rectifier -
The Raspberry Pi Foundation have replaced the existing diode rectifier with what they are calling an "Ideal diode".
A New Transformer - Bourns Planar Transformer
A very interesting almost flat transformer which uses PCB traces as windings for the Transformer its self!
All in all a wonderful and rounded upgrade with some great real world problem solving!
What would you do with the new PoE Hat?