W5500 is WIZnet's flagship Ethernet controller with a unique hardwired TCP/IP stack, enabling direct network connectivity without software TCP/IP implementation. Connects to the host MCU via SPI, features 32KB TX/RX buffer, supports up to 8 sockets — the most widely adopted Ethernet chip in the Arduino/Raspberry Pi ecosystem.
| TCP/IP Stack | Hardwired |
| Host Interface | SPI (up to 80 MHz) |
| Buffer Memory | 32KB |
| Sockets | 8 |
| Protocols | TCP, UDP, IPv4, ICMP, ARP, IGMP, PPPoE |
| Speed | 10/100 Mbps |
| PHY | Integrated |
| Supply Voltage | 3.3V |
| Package | LQFP48 |
W5100S is an enhanced version of W5100, supporting both SPI and parallel interfaces with 16KB TX/RX buffer and 4 sockets. Adds SOCKET-less commands, Wake on LAN (WOL), and PHY power-down mode compared to W5100 — ideal for embedded systems requiring a parallel bus interface.
WIZPoE-P1 is a WIZnet IEEE 802.3af/at standard PoE Powered Device (PD) module that draws power directly from the Ethernet cable, outputting 5V at up to 8W — no separate power cable needed. Suitable for IP cameras, industrial sensors, APs, access control devices, and other PoE-powered applications.
