LAN7801T-I/9JX - USB 3.1 Gen1 to GbE Bridge | Microchip | RGMII
Артикул: LAN7801T-I/9JX ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 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 Обзор
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.
Аналоги без доработки для LAN7801T-I/9JX — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
LAN7801/9JX
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LAN7801T/9JX
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LAN7801T-I/9JXVAO
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LAN7800/Y9X
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AX88179
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
RTL8153
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LAN7801T-I/9JX Характеристики
| Функция | 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) |
| Рабочая температура | -40 C to +85 C (Industrial) |
| Корпус | 64-pin SQFN (9x9 mm) with exposed pad |
| Тип монтажа | 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) |
| Статус RoHS | Compliant |
| Lead-Free | Yes |
Конфигурация выводов LAN7801T-I/9JX
| Контакт 1 | VDD33 — 3.3V supply for I/O and USB 2.0 analog |
| Контакт 2 | VDD18 — 1.8V supply for core logic |
| Контакт 3 | XI — 25 MHz crystal input |
| Контакт 4 | XO — 25 MHz crystal output |
| Контакт 5 | RBIAS — External resistor bias for internal reference |
| Контакт 6 | DP — USB 2.0 D+ differential data |
| Контакт 7 | DM — USB 2.0 D- differential data |
| Контакт 8 | VBUS — USB VBUS supply detect |
| Контакт 9 | USB3_TXP — USB 3.1 Gen1 transmit positive |
| Контакт 10 | USB3_TXN — USB 3.1 Gen1 transmit negative |
| Контакт 11 | USB3_RXP — USB 3.1 Gen1 receive positive |
| Контакт 12 | USB3_RXN — USB 3.1 Gen1 receive negative |
| Контакт 13 | GND_USB — USB ground reference |
| Контакт 14 | RGMII_TXC — RGMII transmit clock to PHY |
| Контакт 15 | RGMII_TXD0 — RGMII transmit data bit 0 |
| Контакт 16 | RGMII_TXD1 — RGMII transmit data bit 1 |
| Контакт 17 | RGMII_TXD2 — RGMII transmit data bit 2 |
| Контакт 18 | RGMII_TXD3 — RGMII transmit data bit 3 |
| Контакт 19 | RGMII_TX_CTL — RGMII transmit control |
| Контакт 20 | GND — Digital ground |
| Контакт 21 | RGMII_RXC — RGMII receive clock from PHY |
| Контакт 22 | RGMII_RXD0 — RGMII receive data bit 0 |
| Контакт 23 | RGMII_RXD1 — RGMII receive data bit 1 |
| Контакт 24 | RGMII_RXD2 — RGMII receive data bit 2 |
| Контакт 25 | RGMII_RXD3 — RGMII receive data bit 3 |
| Контакт 26 | RGMII_RX_CTL — RGMII receive control |
| Контакт 27 | MDIO — Management data I/O for PHY |
| Контакт 28 | MDC — Management data clock for PHY |
| Контакт 29 | VDD_RGMII — RGMII I/O supply (1.8V or 2.5V) |
| Контакт 30 | RESET_N — Active-low device reset |
| Контакт 31 | INT_N — Active-low interrupt output to host |
| Контакт 32 | GPIO0 — General-purpose I/O 0 |
| Контакт 33 | GPIO1 — General-purpose I/O 1 |
| Контакт 34 | GPIO2 — General-purpose I/O 2 |
| Контакт 35 | GPIO3 — General-purpose I/O 3 |
| Контакт 36 | GPIO4 — General-purpose I/O 4 |
| Контакт 37 | GPIO5 — General-purpose I/O 5 |
| Контакт 38 | GPIO6 — General-purpose I/O 6 |
| Контакт 39 | GPIO7 — General-purpose I/O 7 |
| Контакт 40 | SPI_CLK — SPI clock for EEPROM/flash |
| Контакт 41 | SPI_DO — SPI data out to EEPROM/flash |
| Контакт 42 | SPI_DI — SPI data in from EEPROM/flash |
| Контакт 43 | SPI_CS_N — SPI chip select for EEPROM/flash |
| Контакт 44 | JTAG_TCK — JTAG test clock |
| Контакт 45 | JTAG_TMS — JTAG test mode select |
| Контакт 46 | JTAG_TDI — JTAG test data in |
| Контакт 47 | JTAG_TDO — JTAG test data out |
| Контакт 48 | TRST_N — JTAG test reset (active-low) |
| Контакт 49 | VDD_PLL — 1.8V PLL supply |
| Контакт 50 | PLL_GND — PLL ground return |
| Контакт 51 | NC — Not connected (per datasheet) |
| Контакт 52 | NC — Not connected (per datasheet) |
| Контакт 53 | NC — Not connected (per datasheet) |
| Контакт 54 | NC — Not connected (per datasheet) |
| Контакт 55 | NC — Not connected (per datasheet) |
| Контакт 56 | VDD33_AUX — 3.3V auxiliary supply |
| Контакт 57 | VDD18_AUX — 1.8V auxiliary supply |
| Контакт 58 | LINK_LED — Link status LED driver |
| Контакт 59 | ACTIVITY_LED — Activity LED driver |
| Контакт 60 | SPEED_LED — Speed indication LED driver |
| Контакт 61 | NC — Not connected (per datasheet) |
| Контакт 62 | NC — Not connected (per datasheet) |
| Контакт 63 | NC — Not connected (per datasheet) |
| Контакт 64 | EPAD — Exposed thermal pad - tie to ground |
Типичное применение
LAN7801T-I/9JX подходит для 7 применениеs: 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.
Рекомендуется
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.
Рекомендуется
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.
Рекомендуется
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.
Рекомендуется
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.
Рекомендуется
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.
Рекомендуется
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.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для LAN7801T-I/9JX — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | 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 |
Ключевые отличия
- Industrial temperature rating in a true 64-SQFN (9x9) Microchip package (против LAN7801/9JX)
- Backwards-compatible same-footprint upgrade within the LAN78xx family (против LAN7800/Y9X)
- AEC-Q100 sibling variant for automotive platforms (против LAN7801T-I/9JXVAO)
- Lower-cost cross-brand option with integrated PHY (против RTL8153)
Заметки по проектированию
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.
Информация о соответствии
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.
