Ethernet HAT WIZnet Ethernet HAT is a Raspberry Pi Pico pin-compatible board that utilizes the W5100S controller. The Ethernet HAT supports both 3.3V and 5V. The Ethernet HAT simultaneously supports four independent hardware SOCKETs and provides Internal 16Kbytes Memory for TX/ RX buffers. The WIZnet Ethernet HAT is designed for simple plug-and-play.