LAN7800/VSX USB 3.1 Gen1 to Gigabit Ethernet Bridge | Microchip Technology
MPN: LAN7800/VSX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LAN7800/VSX Overview
An Ethernet controller is an interface integrated circuit that manages data exchange between a host computer or embedded processor and a physical Ethernet network. This LAN7800 bridges SuperSpeed USB 3.1 Gen1 traffic to copper Ethernet, supporting 10, 100, and 1000 Mb/s operation. Its integrated PHY reduces the need for a separate physical-layer transceiver, while the integrated USB and Ethernet blocks simplify host-side software connectivity through standard network-device operation.
The key verified feature set includes SuperSpeed USB 3.1 Gen1 connectivity, a 10/100/1000 Ethernet controller interface, and an integrated 10/100/1000 Ethernet PHY. Microchip describes the LAN7800 as a high-performance, cost-effective USB-to-Ethernet connectivity solution. The 48-SQFN package supports compact PCB designs, but its exposed thermal pad and high-speed interfaces require careful layout and thermal implementation.
The controller is designed for USB 3.1 Gen1-to-Gigabit Ethernet conversion rather than general-purpose data acquisition. Its USB side connects to a modern host or embedded system, while its Ethernet side connects to a network through an RJ45 module and appropriate magnetic isolation or magnetics. USB bus power can support portable dongle designs, while external power may be required depending on the implementation and operating mode.
Typical applications include notebook and tablet docking stations, USB port replicators, set-top boxes, personal video recorders, embedded Linux systems, USB-to-Ethernet adapters, and test equipment. The LAN7800 is particularly useful when a product needs one USB connection to provide reliable wired Ethernet without adding a separate host Ethernet PHY or a large external bridge assembly.
For layout, follow Microchip’s published LAN7800 schematic checklist and evaluation-board guidance. Pay particular attention to the high-speed USB differential pair, Ethernet differential pairs, power rails, decoupling, return paths, and exposed-pad connection. Confirm the exact package pin assignments and electrical limits against the current manufacturer datasheet before release to production.
This page combines the verified manufacturer and distributor information for LAN7800/VSX with application guidance, design cautions, and a comparison framework. It helps engineers determine whether the integrated USB-to-Gigabit Ethernet bridge fits a docking, embedded, or adapter design before completing board-level validation.
Drop-in alternatives for LAN7800/VSX — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LAN7800/VSX (same form factor and footprint) — differing in Package, Supply Voltage, Energy Efficient Ethernet, Ethernet Speed, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LAN7800-I/VSX
✅ Drop-In✓ In Stock
$4.55 / Unit
View Datasheet →LAN7850/8JX
✅ Drop-In📋 Reference alternative (not in catalog)
LAN7801/9JX
✅ Drop-In📋 Reference alternative (not in catalog)
LAN7800/VSX Specifications
| Product Type | USB 3.1 Gen1 to 10/100/1000 Ethernet controller |
| USB Interface | SuperSpeed USB 3.1 Gen1 |
| Ethernet Data Rates | 10/100/1000 Mb/s |
| Ethernet PHY | Integrated 10/100/1000 Ethernet PHY |
| Package | 48-SQFN, 6 x 6 mm |
| Supply Voltage | 1.8 V / 3.3 V |
| Automotive Reference | Automotive application reference in verified comparison data |
| Mounting Style | Surface mount |
| Ethernet Controller | 10/100/1000 Base-TX PHY interface |
| Primary Function | USB-to-Ethernet bridge |
| Application Category | Notebook/tablet docking, set-top box, PVR, port replicator, USB-to-Ethernet dongle, embedded system, test instrumentation |
| Manufacturer | Microchip Technology |
| Pin Count | 48 pins |
| USB Power Configuration | Bus-powered USB-to-Ethernet interface capability stated in product description |
LAN7800/VSX 48-sqfn, 6 x 6 mm Pin Configuration Guide
Pin configuration for LAN7800/VSX (48-sqfn, 6 x 6 mm package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for LAN7800/VSX.
Refer to the datasheet for full pin configuration.
Typical Applications
LAN7800/VSX is suitable for 6 applications: Notebook and Tablet Docking Stations, USB-to-Ethernet Dongles, Set-Top Boxes and PVRs, Embedded Linux Systems, USB Port Replicators, Test and Measurement Instruments.
Notebook and Tablet Docking Stations
The LAN7800/VSX fits docking stations that need to add wired Gigabit Ethernet through a USB 3.1 Gen1 port. Its integrated 10/100/1000 Ethernet PHY avoids the need for a separate physical-layer device, while the 48-SQFN 6 x 6 mm package supports compact connector-dense designs. The dock must still provide proper USB routing, Ethernet magnetics, connector shielding, power management, and host-driver support. Compared with a discrete USB-to-Ethernet solution, the integrated bridge can reduce board area and simplify assembly, but high-speed differential routing and exposed-pad thermal design remain essential.
Recommended
USB-to-Ethernet Dongles
The LAN7800/VSX is well suited to compact USB-to-Ethernet adapters because it combines the USB device controller, Ethernet MAC, and integrated Gigabit Ethernet PHY in one 48-SQFN package. A dongle can use the verified 1.8 V/3.3 V supply references while implementing the manufacturer’s recommended power filtering and decoupling. The design must account for USB connector insertion forces, RJ45 magnetics, cable ESD protection, bus-power limits, and heat dissipation. The integrated PHY can simplify the analog network path, but it does not remove the need for careful magnetic and signal-integrity design.
Recommended
Set-Top Boxes and PVRs
Set-top boxes and personal video recorders can use the LAN7800/VSX when they need a wired network path from a USB-capable host processor. The device’s 10/100/1000 Ethernet support gives the product a path to higher bandwidth than Fast Ethernet, while the integrated PHY keeps the external circuit simpler than a separate MAC and transceiver arrangement. Firmware support, boot-time network behavior, thermal performance, and connector compliance determine whether the bridge is suitable. Engineers should verify the host USB stack and test cable interoperability across 10, 100, and 1000 Mb/s links.
Recommended
Embedded Linux Systems
The LAN7800/VSX can provide wired Ethernet connectivity to embedded Linux systems that expose a compatible USB host interface. Its integrated 10/100/1000 Ethernet PHY supports standard copper Ethernet operation and can simplify the hardware tree compared with a discrete bridge. Software support remains a key requirement because the host driver, device enumeration, DHCP behavior, and network performance must be validated on the target kernel. Power budgeting, watchdog behavior, thermal rise, and industrial temperature requirements should be assessed before deployment in embedded equipment.
Recommended
USB Port Replicators
The LAN7800/VSX is a practical choice for USB port replicators that expand a host with a wired network port. The USB 3.1 Gen1 interface provides a modern high-speed host connection, and the integrated Ethernet PHY supports 10/100/1000 Mb/s links in a compact 48-SQFN package. The port replicator must preserve USB signal integrity across connector and cable transitions, provide the required Ethernet isolation components, and manage power for the bridge and magnetics. Validation should include hot-plug behavior, driver loading, suspend and resume, network recovery, and thermal performance in the smallest supported enclosure.
Recommended
Test and Measurement Instruments
Test instruments can use the LAN7800/VSX to add a Gigabit Ethernet management or data path to equipment that already uses USB 3.1 Gen1 internally. The integrated PHY reduces external component count, while support for 10, 100, and 1000 Mb/s allows common network test configurations. Measurement equipment must control ground and return paths carefully, isolate analog and digital supplies, and provide deterministic reset and firmware-startup behavior. Confirm driver support and sustained throughput before relying on the link for time-critical data. The device is not itself a measurement frontend; it is the connectivity controller between the instrument and the Ethernet network.
Recommended
Recommended Products Summary
Engineering reference data for LAN7800/VSX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LAN7800-I/VSX | LAN7850/8JX | LAN7801/9JX |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
Key Differentiators
- Integrated USB-to-Gigabit Ethernet bridge (vs LAN7850/8JX)
- Compact 48-SQFN 6 x 6 mm package (vs LAN7800-I/VSX)
- Application coverage across USB networking designs (vs LAN7801/9JX)
- Manufacturer-published design support (vs LAN7800-I/VSX)
Design Notes
Use the current Microchip LAN7800 schematic checklist and evaluation-board layout as the primary references. Route the SuperSpeed USB differential pair and Ethernet differential pairs with controlled impedance, continuous reference planes, short return paths, and minimal stubs. The integrated PHY simplifies the component count but does not remove the need for careful connector-to-PHY routing, especially in compact docking and dongle designs.
The verified schematic checklist identifies VDD12A pins 25, 30, and 44 and states that they supply the analog blocks through the internal 1.2 V switching regulator through a ferrite bead. Follow the manufacturer’s rail definitions, ferrite selection, decoupling values, and startup sequencing rather than treating all supply pins as interchangeable. Validate current draw, voltage ripple, and power sequencing across USB attach, reset, and suspend/resume states.
The 48-SQFN package requires thermal design attention because the exposed pad is part of the package and the LAN7800 contains USB, Ethernet, and internal regulator circuitry. Use the manufacturer’s land pattern and thermal recommendations, connect the exposed pad to the required copper and thermal-via structure, and measure junction or case temperature at the highest expected traffic and ambient conditions. Do not assume that a small package permits unrestricted copper use.
Do not treat LAN7800-I/VSX, LAN7850/8JX, or LAN7801/9JX as interchangeable solely because they are related Microchip Ethernet-interface products. Confirm the exact suffix, package drawing, pin map, USB generation, Ethernet features, electrical limits, and temperature range in the current datasheet. Also validate host-driver support, cable compatibility, magnetics, ESD protection, and network recovery behavior in the finished product.
Compliance Information
The supplied verified results do not state the device’s RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Compliance must be confirmed from the current manufacturer product documentation or supplier declaration.
