WIZ811MJ

Overview

The WIZ811MJ is a through-hole network module integrating the W5100 hardware TCP/IP chip and a MAG-JACK with an integrated transformer. It supports 10/100 Base-TX Ethernet with half or full duplex modes, automatic negotiation, and auto-crossover detection. The module operates at 3.3V while tolerating 5V I/O signals. It features built-in hardware protocols including TCP, IPv4, UDP, ICMP, ARP, PPPoE, and IGMP. The device provides four independent hardware sockets for simultaneous connections and interfaces via SPI or direct/indirect bus modes using a 2x10 pin header.

Feature Summary

• Integrates W5100 controller and MAG-JACK into a single component
• Supports 10/100 Base-TX with auto-negotiation capabilities
• Includes built-in hardware protocol stacks for TCP/IP applications
• Provides four independent hardware sockets for concurrent connections

Applications

• Internet of Things (IoT) device connectivity
• Industrial control system networking
• Embedded web server development
• Smart home appliance communication modules

Procurement Notes

Verify the specific suffix against the manufacturer datasheet to confirm package type and temperature range. Ensure the supplier provides the official WIZnet documentation for the exact part number variant. Confirm that the MAG-JACK integration matches the required pinout for your PCB layout. Check for RoHS compliance status if required by your manufacturing standards.

Selection Notes

Select this module when a complete Ethernet solution with integrated PHY and MAC is required without external components. It is suitable for designs needing hardware TCP/IP offloading to reduce MCU load. Consider the 2x10 pin header form factor for prototyping or through-hole assembly requirements. Verify voltage compatibility between the 3.3V core and the host system's I/O levels.

Part Context

The WIZ811MJ belongs to the WIZ810MJ series of embedded Ethernet modules from WIZnet. These modules are designed to simplify network integration by combining the W5100 chip with magnetic components. The MJ suffix typically denotes the through-hole DIP package style, distinguishing it from surface-mount variants in the product family.

Replacement Considerations

WIZ812MJ is a documented alternative within the same series. Verify pin compatibility and functional equivalence before substitution. Ensure the replacement maintains the same 2x10 pin header configuration and electrical specifications.