Raspberry Pi PoE+ HAT (3B+ / 4): specs
Add-on board for the Raspberry Pi 3B+ and Raspberry Pi 4 (not a plain 3B). It powers the Raspberry Pi through its Ethernet cable from an 802.3at PoE+ switch or injector, and has a fan for the processor.
Specs
| Spec | Value | Source |
|---|---|---|
| Standard | IEEE 802.3at-2009 PoE | source Product brief p.3, Specification |
| Input voltage | 37 to 57 V DC, Class 4 device | source Product brief p.3, Specification |
| Output | 5 V DC at 4 A | source Product brief p.3, Specification |
| Cooling | 25 mm x 25 mm brushless fan, 2.2 CFM, with fan control | source Product brief p.3, Specification |
| Isolation | Fully isolated switched-mode power supply | source Product brief p.3, Specification: Features |
| Operating temperature | 0 to +50 C | source Product brief p.3, Specification |
| Compatible computers | Raspberry Pi computers with PoE pins, including Raspberry Pi 3B+ and Raspberry Pi 4 | source Product brief p.2, Overview |
| Connection | Two 0.1-inch headers (40 + 4 pins) on the Raspberry Pi; the supplied spacers go in the four corners first | source Product brief p.4, Installation |
Power
| Value | Source | |
|---|---|---|
| Supply | 37-57 V DC from a PoE+ (IEEE 802.3at) Ethernet port or injector; delivers 5 V DC at 4 A to the Raspberry Pi | source Product brief p.3, Specification |
Pinout
We don't publish a pin table for this part: no official source we could verify gives one. Check the labels printed on your module, and see the notes below.
The brief gives no pin table: the HAT connects to the Raspberry Pi's two 0.1-inch headers (40 + 4 pins), the four PoE pins carrying the input power.
Build with it
Project ideas for the Raspberry Pi PoE+ HAT (3B+ / 4). Each link opens Soldr with the prompt filled in; Soldr assigns the pins, checks power and shows how to wire every part.
- Ethernet-powered camera: Requires an 802.3at PoE+ switch or injector that you already own (not sold here). One Ethernet cable carries data and power from that PoE+ source; the camera uses the Pi's camera connector. Tell people who may be filmed that the camera is there. Learning project.
- Night-view Ethernet camera: Requires an 802.3at PoE+ switch or injector that you already own (not sold here). Same single-cable power as above with an infrared-capable camera board; the camera module itself is not documented here. Tell people who may be filmed that the camera is there.
- Always-on network utility box: Requires an 802.3at PoE+ switch or injector that you already own (not sold here). Powered over Ethernet from your PoE+ source, the HAT supplies 5 V at 4 A to the Raspberry Pi, so no separate power supply is needed as long as that PoE+ equipment is on the network.
Common mistakes
- Powering the Raspberry Pi any other way while the HAT is fitted: the brief says it should only be powered through the Ethernet cable (source: link, p.5 Warnings)
- Expecting it to work on a plain Ethernet socket: it needs power-sourcing equipment (a PoE switch or injector) on the network (source: link, p.2 Overview)
- Handling the HAT while powered: the brief warns of injury from potentially high voltages; also pull it off the pins evenly, not one end first (source: link, p.4-5)
Not covered by the official source
- The brief gives no pin table and no fan connector details.
- The brief does not say whether Raspberry Pi 5 is supported.
- The brief names the Raspberry Pi 3B+ and Raspberry Pi 4 as the supported boards; a plain Raspberry Pi 3B has no PoE header.
Sources
- link (Raspberry Pi PoE+ HAT product brief, published April 2024)