WIZ125SR

Overview

The WIZ125SR is a serial-to-Ethernet gateway module manufactured by WIZnet, designed to enable legacy serial devices to connect to Ethernet networks. It integrates the W5500 hardwired TCP/IP embedded Ethernet controller, which supports TCP, UDP, IPv4, ICMP, ARP, IGMP, and PPPoE protocols within a single chip. The device features an internal 32kbyte memory buffer for packet processing and provides eight independent hardware sockets for simultaneous connections. Communication with external microcontrollers or host systems is facilitated via a Serial Peripheral Interface (SPI) supporting up to 80 MHz speed. The module operates at 3.3V with 5V I/O tolerance and includes Wake-on-LAN capabilities.

Feature Summary

• Integrates hardwired TCP/IP stack with embedded 10/100 Ethernet MAC and PHY
• Provides eight independent hardware sockets for concurrent network connections
• Supports high-speed SPI interface for efficient data transfer with host controllers
• Includes internal 32KB memory buffer dedicated to Ethernet packet processing

Applications

• Industrial automation systems requiring serial device connectivity over Ethernet
• Smart home networking for integrating legacy RS-232/RS-485 peripherals
• Remote monitoring solutions for IoT sensor data transmission
• Embedded system upgrades enabling internet connectivity for standalone devices

Procurement Notes

Verify the specific firmware version and pinout configuration against the official WIZ125SR datasheet before integration. Confirm that the target application environment supports the required 3.3V logic levels and SPI timing constraints. Ensure compliance with regional electromagnetic compatibility standards for industrial deployment.

Selection Notes

Select this module when existing serial equipment requires network access without replacing the core hardware. It is suitable for designs needing multiple simultaneous socket connections handled by hardware rather than software overhead. Consider the 48-pin LQFP package dimensions for PCB layout planning and thermal management requirements.

Part Context

This module utilizes the W5500 chip, a market-proven hardwired TCP/IP solution from WIZnet. The W5500 eliminates the need for complex software protocol stacks in microcontrollers, simplifying development. The WIZ125SR serves as a complete gateway solution, encapsulating the controller, PHY, and necessary support circuitry into a compact form factor for easy embedding.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Alternative solutions may require custom TCP/IP stack implementation or different gateway modules with varying protocol support.