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Quick Overview

WIZ850io is an compact size network module that includes a W5500 (TCP/IP hardwired chip and PHY embedded), a transformer and RJ45


Compact size network module based on the W5500

Product Description

WIZ850io is an compact size network module that includes a W5500 (TCP/IP hardwired chip with embedded PHY) a transformer and RJ45. The module is designed to be a fully pin-compatible replacement of the WIZ820io which has been widely used in the market over the last few years. The WIZ850io has a very small form factor and is just a little bigger than a usual RJ45 connector. The connection from the WIZ850io to your microcontroller is done by SPI mode 0 & 3. Already existing projects with the WIZ820io can be transformed to be used with the WIZ850io by modifing the firmware.


  • Plugin network module
  • based on W5500
  • High Speed SPI support (mode 0, 3)
  • 8 hardware sockets with up to 32 kB total memory
  • Power Down & Wake-on-Lan functionality
  • 23 x 25 mm PCB size with 2.54 mm pitch


Related Links

WIZ850io product page on

WIZ850io documentation in the wiki

More references for WIZ850io in the WIZnetMuseumLogo WIZnetMuseum

Additional Information

Dimension 23 x 25 x18 mm
Ethernet I/F PHY
Operating Temperature -40 °C to +85 °C
Operating Voltage 3.3 V
Functions 3-in-1, TCP/IP+MAC+PHY
Auto Negotiation Yes
Network sockets count 8
internal DPRAM buffer memory 32 kB
Package pin module
pin count 2 x 6
auto MDIX No
Wake on Lan Yes
Power Down Mode Yes
typ. Power Consumption 132 mA
SPI (max. speed) 80 MHz
PHY chip internal
Related Chip/Module W5500
Ethernet connector RJ45
pin pitch 2.54 mm
MAC address inside No
PoE possible No
Ethernet Speed 10/100
parallel memory bus No
Manufacturer WIZnet

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