WIZ850io

WIZ850io is a compact size network module that includes a W5500 (TCP/IP hardwired chip and PHY embedded), a transformer and RJ45. It can be used as a component and no effort is required to interface W5500 and Transformer. The WIZ850io is an ideal option for users who want to develop their Internet enabling systems rapidly. WIZ850io is hardware compatible with WIZ820io. WIZ820io users, to migrate to WIZ850io, need to modify the Firmware.

Built-in W5500

Hardwired TCP/IP (8 sockets), 32KB socket buffers

ioModule Form Factor

Support 2×10, 2.54mm header · compact pluggable

SPI

Support Fast-SPI (MODE 0/3)

Ethernet MACPHY

Support 10BaseT/10BaseTe/100BaseTX Ethernet MACPHY

Datasheet

Docs

Store

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Key Features

Internet Protocols

Support TCP, UDP, IPv4, ICMP, ARP, IGMPv1/v2, PPPoE

Integrated RJ-45 (MagJack)

Support transformer & Link/Act LEDs built-in

Dedicated TX/RX Buffers

Support 32KB configurable allocation for stable throughput

3.3V -40℃ to 85℃

Support 3.3V Operation (1.8V to 3.3V)

Pin Information

J1 — SPI Interface

Pin	Type	Name	Description
1	P	GND	Ground
2	P	GND	Ground
3	I	MOSI	SPI Master-Out / Slave-In
4	I	SCLK	SPI clock input
5	I	SCNn	SPI chip select (active low)
6	O	INTn	Interrupt output (low-active) — indicates socket events like connection, disconnection, data reception, and WOL

J2 — Power & Control

Pin	Type	Name	Description
1	P	GND	Ground
2	P	3V3D	3.3 V Power supply
3	P	3V3D	3.3 V Power supply
4	–	NC	Not connected
5	I	RSTn	Hardware reset input (active low, ≥ 500 µs)
6	O	MISO	SPI Master-In / Slave-Out

Features

Compact plug-in Ethernet module integrating W5500 with transformer and RJ45 MAG-JACK
Hardware compatible with WIZ820io
No hardware design required for PHY or transformer
Supports high-speed SPI interface (Mode 0/3)
Power-down and Wake-on-LAN support
Small form factor: 20 × 25 mm
1×6-pin headers (2.54 mm pitch)
Operating temperature: −40 °C ~ +85 °C

Electrical Characteristics

DC Characteristics

Symbol	Parameter	Pins	Min	Typ	Max	Unit
V_DD	Supply voltage	3.3 V	2.97	3.3	3.63	V
V_IH	High-level input	ALL	0.7×Vcc	–	5.5	V
V_IL	Low-level input	ALL	–0.3	–	0.3×Vcc	V
V_OH	High-level output	ALL	2.9	3.3	–	V
V_OL	Low-level output	ALL	0.0	–	0.52	V
I_DD	Supply current (Normal)	3.3 V	–	141	–	mA
I_PD	Supply current (Power-down)	3.3 V	–	13	–	mA

Power Dissipation

Condition	Min	Typ	Max	Unit
100 Mb/s Link	–	135	–	mA
10 Mb/s Link	–	80	–	mA
Unlink (Auto-negotiation)	62	–	75	mA
100 Mb/s Tx	137	–	141	mA
10 Mb/s Tx	–	83	–	mA
Power-down	–	13	–	mA

Documentation

This section provides key documentation, including user manuals and datasheets, to help you understand product features, specifications, and usage.

Name	Description	Notes
Datasheet	Technical specifications and features of the W5500 chip	EN 한국어	EN 한국어

Software Resources

Hardware Resources

Mechanical Information

Form factor: Plug-in ioModule
Pin pitch: 2.54 mm
Dimensions: 25 × 23 mm

Evaluation Boards & Related modules

Complementary WIZnet solutions with diverse interfaces and performance levels