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  • W5100S-Q


Excl. Tax: €2.20 Incl. Tax: €2.62

Quick Overview

3 in 1 chip for the Internet connectivity
Hardwired TCP/IP + MAC + PHY
Both SPI and parallel bus Interface 48QFN


Hardware TCP/IP Performance and Ease of Use to Low-Cost ‘IoT’ Applications

Product Description

The W5100S is a Hardwired TCP/IP embedded Ethernet Controller that enables easier Internet Connection for embedded Systems using SPI (Serial Peripheral Interface) and Parallel Bus.

W5100S suits users in need of stable Internet Connectivity Best, using a single chip to implement TCP/IP Stack, 10/100 Ethernet MAC, and PHY. The implemented Hardwired TCP/IP stack supports TCP, UDP, IPv4, ICMP, ARP, IGMP, and PPPoE which has been proven through various Applications over many years. W5100S uses a 16 Kbytes Internal Buffer as its Data Communication Memory.

By using W5100S, users can implement the Ethernet Application they need by using a simple socket Program instead of handling a complex Ethernet Controller. It is possible to use 4 independent hardware sockets simultaneously. 

The W5100S SPI supports up to 70 MHz speed and the new efficient SPI Protocol, so users can implement High-Speed Network Communication. In order to reduce the power consumption of the system, W5100S provides a Power Down mode and can be enabled by Wake On Lan.

Information for users of the W5100: The new W5100S is not fully pin-to-pin compatible with the W5100, but the software compatibility is kept, hence the software for the W5100 can be used with the W5100S without any modification.


  • 48QFN lead-free package (7x7mm, 0.5mm pitch)
  • Host Interface: SPI (up to 70MHz, mode 0, 3) and Parallel System Bus with 2 Address signals and 8 Bits Data
  • Unattackable hardware engine for preventing network attacks such as flooding, spoofing, injection
  • 4 Independent hardware sockets simultaneously 
  • supports various Internet Protocols: TCP, UDP, WOL over UDP, ICMP, IGMPv1/v2, IPv4, ARP, PPPoE
  • Internal 16 Kbytes memory for TCP/IP packet processing
  • socket-less commands possible: ARP request and ping requests
  • 10BaseT / 100Base TX Auto Negotiable Ethernet PHY Embedded
  • Auto-MDIX in auto-negotiation mode (Half/Full Duplex, 10/100 MBit/s speed)
  • IP fragmentation not supported, ARP-cache table will not be stored permanently
  • 3.3V operating voltage with 5V I/O signal tolerance
  • LED outputs (full/half duplex, link, 10/100 speed, active)
  • Reduced heat dissipation (W5500: 40℃ / other chips : 60-70℃)
  • Efficient power operation: power down & main clock gating as well as wake-on LAN over UDP


Related Links

W5100S overview

Additional Information

Dimension 7 x 7 mm
Ethernet I/F PHY
Operating Temperature -40 ... + 85 °C
Operating Voltage 3.3 V
Functions 3-in-1, TCP/IP+MAC+PHY
Auto Negotiation Yes
Network sockets count 4
internal DPRAM buffer memory 16 kB
Package QFN
pin count 48
auto MDIX Yes
Wake on Lan Yes
Power Down Mode Yes
typ. Power Consumption tbd
SPI (max. speed) 70 MHz
MCU I/F 8 bit (indirect), SPI
PHY chip W5100S
pin pitch 0.50 mm
Ethernet Speed 10/100
parallel memory bus 8bit indirect
Manufacturer WIZnet

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