LAN7800T-I/VSX

Controllers Overview

The LAN7800T-I/VSX is a SuperSpeed USB 3.1 Gen 1 to 10/100/1000 Ethernet controller manufactured by Microchip Technology. It integrates a Gigabit PHY with HP Auto-MDIX, an Ethernet MAC supporting full-duplex operation, and a USB 3.1 Gen 1 device controller. The component operates within an industrial temperature range of -40°C to +85°C and is housed in a 48-pin SQFN (6x6 mm) package. It supports multiple power supplies including 1.2V, 2.5V, and 3.3V, with variable voltage I/O ranging from 1.8V to 3.3V.

Controllers Feature Summary

• Integrates a SuperSpeed USB 3.1 Gen 1 device controller and a 10/100/1000 Ethernet MAC with PHY.
• Supports Energy Efficient Ethernet (IEEE 802.3az) and Wake on LAN functionality.
• Configurable via One Time Programmable memory for EEPROM-less applications.
• Includes NetDetach capability for automatic USB attachment upon Ethernet cable connection.

Controllers Applications

• Automotive Infotainment systems
• Notebook and Tablet Docking Stations
• USB Port Replicators
• Standalone USB to Ethernet Dongles

Controllers Procurement Notes

Verify the specific suffix 'I' confirms the industrial temperature rating (-40°C to +85°C). Confirm the 'VSX' suffix corresponds to the 48-SQFN (6x6 mm) package variant. Ensure compatibility with required operating voltages and check for any silicon errata sheets relevant to this revision before finalizing procurement.

Controllers Selection Notes

Select this component when a single-chip solution is required for converting SuperSpeed USB 3.1 Gen 1 signals to Gigabit Ethernet. Consider the integrated PHY and MAC capabilities which reduce external component count. Verify that the industrial temperature range meets environmental requirements and that the SQFN package fits the PCB layout constraints.

Controllers Part Context

This part belongs to the LAN7800 series of USB to Ethernet controllers. It is distinct from commercial variants by its extended temperature range. The 'T' indicates tape and reel packaging, while 'I' denotes the industrial grade. It serves as a bridge between host processors using USB interfaces and standard Ethernet networks.

Controllers Replacement Considerations

LAN7800T/VSX: Commercial temperature version of the same package.

Controllers FAQ

Does the LAN7800T-I/VSX support jumbo frames?

Yes, the controller supports 9 KB jumbo frame handling.

What is the function of the VBUS_DET pin?

The VBUS_DET pin detects the state of upstream bus power and must be tied to VDD33A for bus-powered operation.