WIZnet Ethernet HAT (Hardware Attached on Top) is a Raspberry Pi Pico pin-compatible board that utilizes a W5100S chip. It supports both 3.3V & 5V.

Please refer to this link to find more information about W5100S.

Comes without headers, so you'll probably also want to pick up some stacking socket headers to attach it to your Pico. If you have pin headers sticking out of the back of your Pico, you'll want to solder the sockets to the top side of the ethernet board (that's the side with the ethernet connector on).

Features

• Includes W5100S
• Supports Hardwired Internet Protocols: TCP, UDP, WOL over UDP, ICMP, IGMPv1/v2, IPv4, ARP, PPPoE
• Supports 4 Independent Hardware SOCKETs simultaneously
• Internal 16 Kbytes Memory for TX/ RX Buffers
• Operation Voltage 3.3V / 5V
• Built-in LDO (LM8805SF5-33V)
• SPI Interface
• 5V I/O tolerance
• 10 / 100 Ethernet PHY embedded
• Supports Auto Negotiation
• Full / Half Duplex
• 10 / 100 Based
• Built-in RJ45 (RB1-125BAG1A)

Pin Description

I/O	Pin Name	Description
P	VBUS	Power supply, 4.3~5.5 Voltage
P	3V3	Power supply, 3.3 Voltage
P	GND	Power ground
I	INTn	W5100S Interrupt : Low activity.
I	RSTn	W5100S Reset : Low activity
I	SPI0 TX	SPI MOSI (Master Out Slave In)
I	SPI0 SCK	SPI Clock
I	SPI0 CSn	SPI Slave Select
O	SPI0 RX	SPI MISO(Master In Slave Out)

Technical Reference

• W5100S Datasheet v1.2.5

Schematic & Part list & Gerber File

• Github
• Schematic

Dimension (Unit : mm)

• 21 x 68 x 18 (mm)

Firmware Examples

• C/C++ Examples
• CircuitPython Examples