W5100S-L TCP/IP Embedded Ethernet Controller LQFP48
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Prices updated: 13 Oct 2026
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About this product
A hardwired TCP/IP Ethernet controller that adds network connectivity to embedded systems through an SPI interface. It integrates the TCP/IP stack and the 10/100 Ethernet MAC and PHY in one chip, so applications can be built with simple socket programming.
Specifications
- Interface
- SPI
- Ethernet speed
- 10/100 Mbps
- Protocols
- TCP, UDP, IPv4, ICMP, ARP, IGMP, PPPoE
- Internal buffer
- 32 KB
- Package
- LQFP48
- Operating voltage
- 3.3 V
Frequently asked questions
Does the W5100S-L need an external Ethernet PHY chip?
No. The chip integrates the 10/100 Ethernet MAC and PHY. Your board still needs an RJ45 jack with magnetics for the network connection.
How does a microcontroller use this chip?
The microcontroller communicates with the W5100S-L over SPI and uses socket function calls. The chip handles the TCP/IP stack, so the microcontroller does not need to run the full network stack.
