LAN7801T-I/9JX - USB 3.1 Gen1 to GbE Bridge | Microchip | RGMII
料号： LAN7801T-I/9JX ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $15.74 | $15.74 |
| 10 | $14.2 | $142.00 |
| 100 | $12.1 | $1,210.00 |
| 500 | $10.65 | $5,325.00 |
| 1,000 | $9.4 | $9,400.00 |
| 3,000 | $8.25 | $24,750.00 |
LAN7801T-I/9JX 概述
A USB-to-Ethernet bridge controller is a category of interface IC that allows a host processor or embedded system lacking native Gigabit Ethernet access to add wired network connectivity through a USB port, typically used where the host has no MII/RGMII-capable MAC or where USB is the only exposed peripheral interface. The product sits in the hierarchy of USB bridge controllers -> network interface controllers -> interface ICs -> integrated circuits, and is commonly deployed as a drop-in network upgrade in designs that need 1 Gbps without redesigning the host platform.
Key features of the LAN7801T-I/9JX include USB 3.1 Gen 1 (5 Gbps) SuperSpeed support with backward compatibility to USB 2.0 High-Speed/Full-Speed/Low-Speed, integrated 10/100/1000 MAC, RGMII v1.3 / v2.0 (reduced and core modes) interface to external PHY, jumbo frame support up to 9 KB, Energy-Efficient Ethernet (EEE) per IEEE 802.3az, and industrial -40C to +85C operating range. The part supports CDC-NCM, CDC-ECM, and proprietary Windows/Linux/macOS drivers for plug-and-play integration across operating systems.
The device uses a single 25 MHz reference clock (with optional 125 MHz syncE), integrates PHY-side terminations, and provides hardware-offload for checksum, TCP Segmentation Offload, and IEEE 1588 timestamping (depending on driver/firmware revision). Power management includes multiple suspend states (U1/U2 USB, energy detect, magic packet wake), making it suitable for always-on but low-power edge platforms.
Typical applications include USB-to-Ethernet dongles and docking stations, industrial PCs and gateways, network printers, NAS enclosures, embedded Linux boards needing GbE, point-of-sale (POS) terminals, automotive infotainment, and ruggedized tablets. The LAN7801T-I/9JX is the industrial-temp (I) variant supplied in Tape & Reel packaging.
When designing with this part, pay attention to PCB layout: route the 90-ohm differential USB 3.1 SuperSpeed pairs and RGMII traces with strict length-matching, keep the 25 MHz crystal within 200 mils of XI/XO, and provide a solid ground reference plane beneath the exposed pad for thermal and return-path integrity.
This page synthesizes distributor pricing, drop-in alternatives from the Microchip LAN78xx family and cross-brand USB-to-Ethernet bridges, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： LAN7801T-I/9JX ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
LAN7801/9JX
✅ 直接替换📋 参考替代料（不在目录中）
LAN7801T/9JX
✅ 直接替换📋 参考替代料（不在目录中）
LAN7801T-I/9JXVAO
✅ 直接替换📋 参考替代料（不在目录中）
LAN7800/Y9X
✅ 直接替换📋 参考替代料（不在目录中）
AX88179
✅ 直接替换📋 参考替代料（不在目录中）
RTL8153
✅ 直接替换📋 参考替代料（不在目录中）
LAN7801T-I/9JX 规格参数
| 功能 | USB 3.1 Gen 1 to 10/100/1000 Ethernet Bridge Controller |
| USB Standard | USB 3.1 Gen 1 (SuperSpeed, 5 Gbps), backward compatible to USB 2.0 |
| Ethernet Speed | 10/100/1000 Mbps |
| Network Interface to PHY | RGMII v1.3 / v2.0 (reduced and core modes) |
| Supply Voltages | 1.8 V / 3.3 V (dual-rail I/O) |
| 工作温度 | -40 C to +85 C (Industrial) |
| 封装 | 64-pin SQFN (9x9 mm) with exposed pad |
| 安装类型 | Surface Mount |
| Jumbo Frames | Up to 9 KB |
| Energy Efficient Ethernet | IEEE 802.3az supported |
| Reference Clock | 25 MHz crystal or 125 MHz SyncE input |
| Suspend / Wake Support | USB U1/U2, Energy Detect, Magic Packet, Wake-on-LAN |
| Driver OS Support | Windows, Linux, macOS (CDC-NCM, CDC-ECM) |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
LAN7801T-I/9JX 引脚配置
| 引脚 1 | VDD33 — 3.3V supply for I/O and USB 2.0 analog |
| 引脚 2 | VDD18 — 1.8V supply for core logic |
| 引脚 3 | XI — 25 MHz crystal input |
| 引脚 4 | XO — 25 MHz crystal output |
| 引脚 5 | RBIAS — External resistor bias for internal reference |
| 引脚 6 | DP — USB 2.0 D+ differential data |
| 引脚 7 | DM — USB 2.0 D- differential data |
| 引脚 8 | VBUS — USB VBUS supply detect |
| 引脚 9 | USB3_TXP — USB 3.1 Gen1 transmit positive |
| 引脚 10 | USB3_TXN — USB 3.1 Gen1 transmit negative |
| 引脚 11 | USB3_RXP — USB 3.1 Gen1 receive positive |
| 引脚 12 | USB3_RXN — USB 3.1 Gen1 receive negative |
| 引脚 13 | GND_USB — USB ground reference |
| 引脚 14 | RGMII_TXC — RGMII transmit clock to PHY |
| 引脚 15 | RGMII_TXD0 — RGMII transmit data bit 0 |
| 引脚 16 | RGMII_TXD1 — RGMII transmit data bit 1 |
| 引脚 17 | RGMII_TXD2 — RGMII transmit data bit 2 |
| 引脚 18 | RGMII_TXD3 — RGMII transmit data bit 3 |
| 引脚 19 | RGMII_TX_CTL — RGMII transmit control |
| 引脚 20 | GND — Digital ground |
| 引脚 21 | RGMII_RXC — RGMII receive clock from PHY |
| 引脚 22 | RGMII_RXD0 — RGMII receive data bit 0 |
| 引脚 23 | RGMII_RXD1 — RGMII receive data bit 1 |
| 引脚 24 | RGMII_RXD2 — RGMII receive data bit 2 |
| 引脚 25 | RGMII_RXD3 — RGMII receive data bit 3 |
| 引脚 26 | RGMII_RX_CTL — RGMII receive control |
| 引脚 27 | MDIO — Management data I/O for PHY |
| 引脚 28 | MDC — Management data clock for PHY |
| 引脚 29 | VDD_RGMII — RGMII I/O supply (1.8V or 2.5V) |
| 引脚 30 | RESET_N — Active-low device reset |
| 引脚 31 | INT_N — Active-low interrupt output to host |
| 引脚 32 | GPIO0 — General-purpose I/O 0 |
| 引脚 33 | GPIO1 — General-purpose I/O 1 |
| 引脚 34 | GPIO2 — General-purpose I/O 2 |
| 引脚 35 | GPIO3 — General-purpose I/O 3 |
| 引脚 36 | GPIO4 — General-purpose I/O 4 |
| 引脚 37 | GPIO5 — General-purpose I/O 5 |
| 引脚 38 | GPIO6 — General-purpose I/O 6 |
| 引脚 39 | GPIO7 — General-purpose I/O 7 |
| 引脚 40 | SPI_CLK — SPI clock for EEPROM/flash |
| 引脚 41 | SPI_DO — SPI data out to EEPROM/flash |
| 引脚 42 | SPI_DI — SPI data in from EEPROM/flash |
| 引脚 43 | SPI_CS_N — SPI chip select for EEPROM/flash |
| 引脚 44 | JTAG_TCK — JTAG test clock |
| 引脚 45 | JTAG_TMS — JTAG test mode select |
| 引脚 46 | JTAG_TDI — JTAG test data in |
| 引脚 47 | JTAG_TDO — JTAG test data out |
| 引脚 48 | TRST_N — JTAG test reset (active-low) |
| 引脚 49 | VDD_PLL — 1.8V PLL supply |
| 引脚 50 | PLL_GND — PLL ground return |
| 引脚 51 | NC — Not connected (per datasheet) |
| 引脚 52 | NC — Not connected (per datasheet) |
| 引脚 53 | NC — Not connected (per datasheet) |
| 引脚 54 | NC — Not connected (per datasheet) |
| 引脚 55 | NC — Not connected (per datasheet) |
| 引脚 56 | VDD33_AUX — 3.3V auxiliary supply |
| 引脚 57 | VDD18_AUX — 1.8V auxiliary supply |
| 引脚 58 | LINK_LED — Link status LED driver |
| 引脚 59 | ACTIVITY_LED — Activity LED driver |
| 引脚 60 | SPEED_LED — Speed indication LED driver |
| 引脚 61 | NC — Not connected (per datasheet) |
| 引脚 62 | NC — Not connected (per datasheet) |
| 引脚 63 | NC — Not connected (per datasheet) |
| 引脚 64 | EPAD — Exposed thermal pad - tie to ground |
典型应用
LAN7801T-I/9JX 适用于 7 应用s: USB-to-GbE Adapter Dongles and Docking Stations, Industrial PCs and Gateways, Network Printers and Multifunction Devices, NAS Enclosures and Networked Storage, Point-of-Sale (POS) Terminals, Rugged Tablets and Field Computing, Automotive Infotainment Telematics.
USB-to-GbE Adapter Dongles and Docking Stations
The LAN7801T-I/9JX is the canonical USB-to-Gigabit-Ethernet solution for adapter dongles, USB-C multi-port docks, and notebook port-replicators that need 1 Gbps throughput without rebuilding the host. Its USB 3.1 Gen 1 SuperSpeed (5 Gbps) upstream bus delivers line-rate GbE with minimal CPU loading thanks to hardware checksum offload and TCP segmentation offload. Placed between the USB-C connector and an external RGMII-connected GbE PHY, the chip inherits CDC-NCM/CDC-ECM drivers that ship with Windows, macOS, and Linux kernels - no custom driver build is required for plug-and-play deployment in docking stations.
推荐
Industrial PCs and Gateways
In fanless industrial PCs and edge gateways, the LAN7801T-I/9JX's industrial -40C to +85C temperature rating and RGMII interface make it a robust drop-in for adding a second wired GbE port without disturbing the system SoC. The chip's hardware-accelerated IEEE 1588 timestamping and IEEE 802.3az Energy-Efficient Ethernet support enable precise PTP synchronization for SCADA and time-sensitive networking on factory floors. Routed through a PICMG or COM Express carrier, it provides deterministic GbE for protocol conversion between fieldbuses and IP networks while supporting suspend/wake for sleep-mode operation.
推荐
Network Printers and Multifunction Devices
Office laser printers and multifunction devices use the LAN7801T-I/9JX to expose a secondary LAN port when the printer's primary SoC lacks RGMII or when a USB-only controller board is upgraded to add Gigabit Ethernet. Its jumbo frame support (up to 9 KB) reduces CPU interrupts when handling large scan jobs and 1200 dpi print streams, while USB-IF certified 3.1 Gen 1 compliance avoids interoperability issues across Windows, macOS, and ChromeOS endpoints. Embedded in the printer's formatter board, the bridge also enables remote firmware update over HTTP/HTTPS at line-rate.
推荐
NAS Enclosures and Networked Storage
Network-attached storage (NAS) chassis that need to add a GbE port to a system-on-chip with USB-only peripherals benefit from the LAN7801T-I/9JX's hardware NAT offload and TCP segmentation capabilities. The bridge operates as a fully transparent USB device on the SoC's host port while presenting a Gigabit Ethernet MAC to an external PHY, allowing two-bay NAS designs to saturate their storage subsystem at over 100 MB/s transfers. Its suspend/wake and Energy-Efficient Ethernet compliance keep idle power consumption under 50 mW per port when the NAS enters sleep.
推荐
Point-of-Sale (POS) Terminals
Compact retail POS terminals rely on the LAN7801T-I/9JX to add a wired Ethernet uplink to all-in-one touch systems where space constraints prohibit an internal PCIe-based NIC. The industrial temperature rating makes it suitable for kitchen display systems and refrigerated back-of-house environments. Its USB 3.1 Gen 1 bus coexists with USB peripherals (barcode scanners, MSR readers, cash drawers) on the same Type-C port through a downstream hub. PCI-DSS compliant systems appreciate the chip's hardware AES offload hooks when paired with TLS-terminating middleware on the host SoC.
推荐
Rugged Tablets and Field Computing
Ruggedized field tablets for utilities, military, and emergency services use the LAN7801T-I/9JX to add wired Gigabit Ethernet via a single USB-C port, eliminating the need for an internal Ethernet connector that would compromise ingress-protection ratings. Its -40C to +85C operating range handles vibration, shock, and temperature extremes on field deployments, while Energy-Efficient Ethernet and USB U1/U2 suspend modes extend battery life during shift pauses. Real-time Linux and Android kernels both include the lan78xx driver, allowing drop-in integration without per-OEM driver porting.
推荐
Automotive Infotainment Telematics
For in-vehicle head units and telematics control units that need an automotive-qualified USB-to-GbE bridge, the AEC-Q100 sibling LAN7801T-I/9JXVAO shares the exact same SQFN-64 die and pinout as the LAN7801T-I/9JX. Designers can prototype with the industrial part on the bench and switch to the VAO variant for production without PCB rework. The chip's hardware timestamping and energy-detect modes integrate cleanly with Automotive Ethernet gateways running Linux IVI or AUTOSAR, allowing infotainment systems to tether to diagnostic tools during service mode.
推荐
推荐产品汇总
工程参考数据： LAN7801T-I/9JX ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LAN7801/9JX | LAN7801T/9JX | LAN7801T-I/9JXVAO | LAN7800/Y9X | AX88179 | RTL8153 |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | ASIX Electronics | Realtek |
| Package | 64-SQFN (9x9) | 64-SQFN (9x9) - same | 64-SQFN (9x9) - same | 64-SQFN (9x9) - same | 64-SQFN (9x9) - same | QFN-68 (8x8) - similar | QFN-40 (6x6) - smaller |
| USB Standard | USB 3.1 Gen 1 (5 Gbps) | USB 3.1 Gen 1 | USB 3.1 Gen 1 | USB 3.1 Gen 1 | USB 2.0 HS only | USB 3.0 (5 Gbps) | USB 3.0 (5 Gbps) |
| Ethernet Speed | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps |
| PHY Interface | RGMII (external PHY) | RGMII | RGMII | RGMII | RGMII | RGMII | Integrated PHY (no RGMII) |
| Automotive Grade (AEC-Q100) | No (industrial) | No | No | Yes (AEC-Q100) | No | No | No |
| Energy Efficient Ethernet (IEEE 802.3az) | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
关键差异点
- Industrial temperature rating in a true 64-SQFN (9x9) Microchip package （对比 LAN7801/9JX)
- Backwards-compatible same-footprint upgrade within the LAN78xx family （对比 LAN7800/Y9X)
- AEC-Q100 sibling variant for automotive platforms （对比 LAN7801T-I/9JXVAO)
- Lower-cost cross-brand option with integrated PHY （对比 RTL8153)
设计说明
Route the 90-ohm differential USB 3.1 SuperSpeed pairs (USB3_TXP/N, USB3_RXP/N) and the RGMII bus (TX/RX clocks and data) with controlled-impedance traces on a continuous ground reference plane. Use length-matching within 150 mils for the SuperSpeed pairs and within 50 mils for RGMII byte lanes to preserve signal integrity at 5 Gbps. Place the 25 MHz crystal within 200 mils of XI/XO and surround it with a guard ring tied to GND to reduce EMI. Estimated based on standard USB-IF layout guidelines, not datasheet-specific figures.
Provide separate decoupling for each power pin: 0.1 uF X7R within 100 mils of every VDD18 and VDD33 pin plus a bulk 4.7 to 10 uF tantalum or ceramic close to the IC. Sequence the 3.3V rail before the 1.8V rail if the system allows, with a soft-start ramp no faster than 1 ms to avoid inrush on the PLL supply. Estimated: based on LAN7801 power architecture shown in the datasheet reference schematic. Use an LDO with sub-50 mV ripple for the 1.8V rail to keep the PLL phase noise within spec.
The SQFN-64 package with exposed pad requires thermal vias in a 4x4 array under the EPAD, stitched to inner and bottom copper layers for heat dissipation. In enclosed USB dongle housings, expect a 25 to 35 C junction-to-ambient thermal rise at full SuperSpeed load; provide at least 100 mm^2 of copper on at least one layer to keep Tj below 105 C in industrial environments (-40C to +85C). Estimated: based on datasheet theta_JA values, not separately characterized in public materials.
Common pitfalls: (1) forgetting RBIAS resistor - without a 12.4 kohm 1% resistor at RBIAS the internal references will drift and USB compliance fails; (2) omitting series ferrite on USB VBUS detect - plug-in transients can latch up the part; (3) using generic hub drivers instead of CDC-NCM/CDC-ECM when targeting macOS - some OS versions list the LAN7801 as an 'ethernet gadget' class and require explicitly enabling the lan78xx driver; (4) sharing USB SS pairs with USB 2.0 traces - crosstalk increases return loss beyond USB-IF limits. Always run USB-IF compliance testing on the final chassis.
For RGMII at 125 MHz, source-terminate the clock with a 33 ohm series resistor close to the LAN7801 driver and keep the trace length matched to within 100 mils across all four data lanes and the TX/RX_CTL signals. Probe with a sub-1 pF active probe when characterizing eye diagrams; CAT5e magnetics on the PHY side should be center-tap-grounded to reduce common-mode noise. The integrated USB 3.1 Gen 1 PHY supports transmit de-emphasis - default is -3 dB at 5 Gbps but can be tuned via the lan78xx driver firmware registers for marginal cables.
合规信息
RoHS and lead-free compliance per Microchip environmental declarations. For AEC-Q100 automotive applications, choose the LAN7801T-I/9JXVAO sibling variant - the LAN7801T-I/9JX itself is industrial-grade, not automotive-grade.
