| Manufacturer | WIZnet |
| Product Series | W5100S-Q |
| Function | Hardwired TCP/IP Embedded Ethernet Controller |
| Supported Protocols | TCP, UDP, ICMP, IGMPv1/v2, IPv4, ARP, PPPoE, Wake-on-LAN over UDP |
| Number of Sockets | 4 independent hardware sockets |
| Network Data Buffer | 16 KB internal memory for TX and RX buffers |
| Host Interface Options | - High-Speed SPI (Modes 0 and 3, up to 70 MHz) |
| - Parallel System Bus (8-bit) with 2 address signals |
| Ethernet PHY | Integrated 10Base-T / 100Base-TX Ethernet PHY |
| Auto-Negotiation | Supports full and half duplex modes for 10 Mbps and 100 Mbps |
| Auto-MDIX | Supported (only in Auto-Negotiation mode) |
| Wake-on-LAN (WOL) | Supported over UDP |
| Power Management Features | - Ethernet Power Down Mode |
| - Main Clock Gating for power saving |
| Supply Voltage | 3.3V operation with 5V I/O signal tolerance |
| Operating Temperature Range | -40°C to +85°C |
| Package Type | 48-pin QFN (7x7 mm, 0.5 mm pitch) |
| Pin Compatibility | Pin-to-pin compatible with W5100 |
| Network Indicator LEDs | Supports indicators for Full/Half Duplex, Link, 10/100 Speed, and Activity |
| Special Features | - Supports SOCKET-less commands: ARP-Request, PING-Request |
| - Does not support IP fragmentation |
| - Does not maintain ARP-cache table |
| - Designed for low power consumption and minimal heat generation |
WIZnet