LAN7800: SuperSpeed USB 3.1 to Gigabit Ethernet Controller

The Microchip LAN7800 is a single-chip SuperSpeed USB 3.1 Gen 1 to 10/100/1000 Gigabit Ethernet bridge controller. It folds a USB 3.1 Gen 1 device controller and PHY, a 10/100/1000 Ethernet MAC, and a Gigabit Ethernet PHY with HP Auto-MDIX into a single 48-pin QFN, giving a complete USB-to-Ethernet solution for docking stations, dongles, notebooks, set-top boxes and embedded systems. It is configured entirely through on-chip OTP memory (no external EEPROM) and ships with drivers for Windows, Linux, macOS, uBoot, UEFI, PXE and FreeBSD.

The interactive symbol and footprint viewers above are rendered by the wiki from the CAD shipped with this page. Use the toggle at the top-right of the footprint viewer to switch between the QFN 7×7 mm (Y9X) and QFN 6×6 mm (VSX) packages. Pin 1 is the square pad.

Specifications

• Host interface: USB 3.1 Gen 1 (SuperSpeed, 5 Gbps)
• Network: 10 / 100 / 1000 Mbps Ethernet, IEEE 802.3/3u/3ab/3az
• Integrated PHY: Gigabit Ethernet PHY with HP Auto-MDIX
• USB speeds: SS 5 Gbps / HS 480 Mbps / FS 12 Mbps, 4 endpoints
• Configuration. On-chip OTP memory (no external EEPROM)
• Low power: Energy Efficient Ethernet (802.3az), Wake-on-LAN, NetDetach
• GPIO: 8, with flexible link/activity LEDs
• I/O supply: 1.8 to 3.3 V (variable)
• Package: 48-pin QFN, 7×7 mm (Y9X) or 6×6 mm (VSX)
• Temperature: Commercial 0 to +70 °C / Industrial −40 to +85 °C
• Offloads: 802.1q VLAN tagging, 9 KB jumbo frames, IPv4/IPv6/TCP/UDP checksum offload, 32 wake-up frame patterns

Pin configuration

48 signal pins plus the exposed thermal pad (pin 49, VSS). Names and numbers match the schematic symbol and both footprints.

Component variants

Eight orderable part numbers exist. All are the identical LAN7800 silicon. They differ only in package body size, operating-temperature grade and shipping/packaging. There are no functional or electrical differences.

The order code is LAN7800 [T] [-I] / {Y9X | VSX}. Where T = Tape & Reel (blank = tray), -I = Industrial (blank = Commercial), Y9X = 7×7 mm and VSX = 6×6 mm.

QFN 7×7 mm: package code Y9X (default footprint)

0.5 mm pitch, 5.3 × 5.3 mm exposed pad, 1.0 mm body height.

QFN 6×6 mm: package code VSX

0.4 mm pitch, 4.3 × 4.3 mm exposed pad, 0.9 mm body height. Same pinout, smaller board area.

Assets

KiCad symbol, both footprints and the 3D models, plus the canonical adom-lbr JSON the rest is generated from.

Applications

Boards on the Adom wiki that use the LAN7800:

1. USB3.0 to Ethernet Molecule: USB-C to Gigabit Ethernet (data-only) adapter on the LAN7800 (U1).

Related tooling: LAN7800 EEPROM Programmer.

Provenance

• Datasheet: Microchip LAN7800 (DS00001992)
• Symbol, QFN 7×7 (Y9X) footprint, STEP + GLB: Adom library, from the canonical adom-lbr JSON.
• QFN 6×6 (VSX) footprint: KiCad official library (QFN-48-1EP_6x6mm_P0.4mm_EP4.3x4.3mm).
• Fusion and Altium libraries are deliberately absent. They were generated rather than hand-verified, and the generated Altium symbol encoding has produced wrong geometry before.