LAN7800T-I/VSX

LAN7800T-I/VSX is Microchip/SMSC LAN7800 family: a USB 2.0 to 10/100 Mbps Ethernet controller. It provides a USB 2.0 device interface and an integrated Ethernet MAC/PHY to connect a host (MCU/SoC) to a 10/100 Ethernet network. The I suffix indicates Industrial temperature range (−40°C to 85°C); VSX denotes a specific package/variant option. It supports IEEE 802.3 10/100, auto-negotiation, and full/half duplex operation, intended for embedded systems, USB Ethernet dongles, and network-enabled devices. Software support includes Microchip Windows/Linux/macOS drivers and example code; Linux drivers are available in mainstream kernels. The device is powered from USB (5V) and typically requires external magnetics on the Ethernet side. In short, it’s plug‑in USB-to-Ethernet bridge designed for robust, industrial‑grade embedded applications.

The LAN7800T-I/VSX is a USB 3.0-to-Gigabit Ethernet controller. Common equivalents include ASIX AX88179, Realtek RTL8153 (and RTL8153B/RTL8156 variants), and other USB3-to-GbE devices in Microchip’s LAN78xx family. These offer similar USB3 host interfaces and Gigabit PHY functionality.

Here are the key features of LAN7800T-I/VSX:
- USB 2.0 Hi-Speed (up to 480 Mbps) to 10/100 Mbps Ethernet bridge controller
- Integrated 10/100 MAC and PHY with IEEE 802.3/802.3u compliance
- Auto-negotiation with auto MDI/MDIX; supports 10/100BASE-T
- No external PHY required; uses an external 25 MHz clock
- On-chip DMA and packet buffering for efficient data transfer
- 3 configurable status LEDs (link, activity, speed)
- Industrial temperature grade (-40°C to 85°C; I) and RoHS-compliant (VSX)
- USB power management with suspend/low-power modes
- Broad OS support: Windows, Linux, macOS (vendor and community drivers)
- Compact footprint and easy integration into USB-host environments
Optional notes: typical USB-to-Ethernet bridges like LAN7800 provide a complete MAC/PHY with USB interface, intended for PC/SoC hosts needing Ethernet connectivity without a separate NIC.

Manufacturer: Microchip Technology Inc.
What kind of company: Microchip is an American, publicly traded semiconductor company that designs and supplies microcontrollers, analog/mixed‑signal and interface chips (including Ethernet controllers such as the LAN78xx family). The LAN78xx line originally came from SMSC, which Microchip acquired; Microchip serves embedded, industrial, and networking markets.

LAN7800T-I/VSX is a USB 2.0 to 10/100 Mbps Ethernet controller. Typical applications include:
- USB Ethernet adapters and docking stations
- Embedded/IoT devices needing wired LAN
- Industrial equipment (HMIs, PLCs, rugged industrial PCs) in wide temp ranges
- Thin clients, POS terminals, digital signage and kiosks
- Network-enabled consumer electronics such as set-top boxes and printers

The LAN7800T-I/VSX is supplied in a 64-pin QFN package (9 mm × 9 mm, 0.5 mm pitch) with wettable flanks, industrial temperature grade (‑40°C to +85°C), and shipped on tape-and-reel (VSX).