WIZ812MJ

Overview

The WIZ812MJ is a through-hole network module integrating the W5100 hardware TCP/IP controller and a MAG-JACK with an integrated transformer. It supports 10/100 Mbps Ethernet speeds and operates on a 3.3V power supply while tolerating 5V I/O signals. The module provides one Ethernet port and features automatic negotiation and auto-crossover detection. It includes built-in hardware protocols for TCP, UDP, ICMP, ARP, PPPoE, and IGMP, supporting four independent simultaneous connections. The physical dimensions are 55.5 mm x 25 mm x 23.5 mm, and it functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates W5100 hardware TCP/IP stack with built-in PHY and MAG-JACK transformer
• Supports 10/100 Base TX with half/full duplex modes and automatic crossover detection
• Provides direct/indirect bus access and SPI interface options for microcontroller connectivity
• Includes LED indicators for network status monitoring

Applications

• Embedded internet application development requiring rapid prototyping
• Microcontroller-based systems needing simplified Ethernet integration without external PHY components
• Industrial control modules operating in extended temperature environments

Procurement Notes

Verify the specific revision level against official documentation before procurement, as pinouts or electrical characteristics may vary between revisions. Confirm that the required interface mode (SPI or parallel bus) aligns with the target microcontroller's capabilities. Ensure the 3.3V logic level compatibility matches the host system design constraints.

Selection Notes

Select this module when a complete Ethernet solution including the transformer is required to reduce board space and component count. It is suitable for designs utilizing the W5100 chip architecture. Consider the through-hole package form factor if mechanical stability or ease of manual assembly is prioritized over surface-mount density.

Part Context

This module belongs to the WIZnet embedded Ethernet module family, designed to simplify network implementation for developers. It serves as a drop-in replacement for discrete W5100 and transformer assemblies, consolidating the MAC, PHY, and physical layer connectivity into a single standardized component for easier integration into various electronic devices.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.