LAN9646T-I/MXX

Controllers Overview

The LAN9646T-I/MXX is a highly integrated, IEEE 802.3 compliant Layer-2 managed Gigabit Ethernet switch manufactured by Microchip Technology. It incorporates four 10/100/1000BASE-T PHY transceivers and associated MAC units, alongside two individually configurable external MAC ports: one with an SGMII interface and another with a configurable RGMII/MII/RMII interface. The device features a non-blocking wire-speed switching fabric supporting 1 Gbps on the RGMII port, a 4096-entry forwarding table, and a 256 kByte frame buffer. It supports commercial and industrial temperature ranges (-40°C to +85°C) and is housed in a 132-pin DVQFN package.

Controllers Feature Summary

• Integrated four-port 10/100/1000BASE-T PHY transceivers with LinkMD cable diagnostics
• Configurable external MAC ports supporting SGMII (SerDes/SGMII modes) and RGMII/MII/RMII interfaces
• Non-blocking store-and-forward switching fabric with jumbo packet support up to 9000 bytes
• Comprehensive management capabilities including VLAN, QoS, ACL filtering, and IEEE 802.1X access control

Controllers Applications

• Stand-alone 10/100/1000Mbps Ethernet switches
• VoIP infrastructure switches
• Broadband gateways and firewalls
• Wi-Fi access points
• Industrial control and automation switches

Controllers Procurement Notes

Verify the specific suffix 'T' against official documentation, as standard listings often appear as 'LAN9646-I/MXX'. Confirm RoHS compliance status and moisture sensitivity level (MSL 3) requirements for your assembly process. Ensure the 132-pin DVQFN thermal pad grounding guidelines are followed during PCB design to maintain reliability within the specified operating temperature range.

Controllers Selection Notes

Select this component when a compact, fully managed Gigabit switch solution is required with flexible host connectivity options. The inclusion of both SGMII and RGMII/MII/RMII interfaces allows adaptation to various processor or FPGA architectures. Consider the integrated power management features, such as Wake-on-LAN and energy detect power-down, if system power efficiency is a critical design constraint.

Controllers Part Context

The LAN9646 belongs to Microchip's family of high-performance Ethernet switches designed for embedded networking applications. It serves as a bridge between high-speed network infrastructure and host processors, offloading switching tasks via its dedicated hardware fabric. This integration reduces board space and simplifies design compared to discrete switch and PHY combinations.

Controllers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify compatibility with existing designs before considering alternative components from other manufacturers.