Raspberry Pi PoE HAT+ with New Isolated SMPS

In March 2018 we announced the launch of Raspberry Pi 3 Model B+. One of the many features added to the new board was the ability to be powered through Power over Ethernet (PoE) with a HAT. A New POE HAT launched, which is almost two times powerful than the older one.In this blog we are providing a brief discussion about the Raspberry Pi PoE HAT+ with New Isolated SMPS

POE HAT+ thumbnail

The Raspberry Pi just released a new PoE HAT+, which is an upgrade over the previous PoE. It’s great to see the Raspberry Pi team improving on their previous products, as this saves a lot of money in the long run. In this article, I’ll give you a quick rundown of what the new HAT is all about and how it differs from the previous PoE HAT on the market. If you’re unfamiliar with the Raspberry Pi, start with this article. So, let’s get down to business. I’ll start by explaining what PoE HAT is.

What is PoE HAT?

The Raspberry Pi PoE HAT is an add-on board for the Raspberry Pi 3 Model B+ (and later boards). It’s usually used to power the Raspberry Pi over an Ethernet cable if power-sourcing equipment is present on the Ethernet network. In addition, the HAT has a fan to keep the processor on the main Raspberry Pi board cool.

Powering your Raspberry Pi over Ethernet can be very beneficial; it can help you save adapter costs and make the setup look cleaner.

New Feature of this PoE HAT

The new PoE HAT has all of the same specs as the previous one, with the exception that the power supply transformer has been replaced. It’s a totally isolated SMPS that’s largely identical to the previous one. It’s flat and closed, which makes it more stable and performs better. The output power has also been doubled from 2.5 to 4 A, which is better for the Raspberry Pi 4, which consumes 15 watts.

The specs of the new PoE HAT is listed below.

Specification of the new PoE HAT+

  • 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


  •  Fully isolated switched-mode power supply
  • Fan control
  • Operating temperature: 0 °C to +50 °C

Above is the visual comparison of both SMPS on the new & old board.


A PoE HAT is a HAT that uses Ethernet to power the Raspberry Pi board. In terms of power supply, the new PoE HAT+ is nearly twice as powerful as the previous one. PoE HATs can save money on both the fan and the adapter. I hope this article provided you with some useful information. We MATHA Electronics will be back soon with more informative blogs soon.

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