LAN9730-ABZJ

LAN9730-ABZJ is a Microchip/SMSC LAN9730 family USB-to-Ethernet controller. It provides a USB 2.0 full/hi‑speed interface and a built‑in 10/100 Mbps Ethernet MAC/PHY, allowing an embedded device to gain Ethernet connectivity over USB without a separate NIC or PHY. It’s aimed at USB Ethernet adapters, networked peripherals, and other devices needing compact, low-CPU Ethernet support. An OS driver (Linux, Windows, or RTOS) presents a standard Ethernet interface to the host while handling USB traffic. The -ABZJ suffix denotes a specific package/revision (RoHS-compliant variant). For integration details—pinout, electrical specs, USB descriptors, and the register map—consult the official LAN9730 datasheet and driver package from Microchip/SMSC.

Do you mean the LAN9730-ABZJ Ethernet PHY/USB‑to‑Ethernet controller (vendor?) — can you confirm the manufacturer or the chip’s function (PHY vs USB‑to‑Ethernet)? I’ll then list direct equivalents.

Here are the typical features of LAN9730-ABZJ (USB 2.0 to 10/100 Ethernet controller):
- USB 2.0 device interface (Hi-Speed) for host connection
- Integrated 10/100 Mbps Ethernet MAC/PHY
- IEEE 802.3/802.3u compliant; auto-negotiation between 10/100 Mbps
- Full/half duplex operation; auto MDI/MDI-X
- 25 MHz clock input; requires minimal external components
- RJ-45 interface with required magnetics (external components)
- Package: compact 28-pin ABZJ (suitable for space-constrained designs)
- USB Ethernet class driver support on Windows, Linux, macOS
- Low power / suitable for embedded applications
- Internal register map and management interface for easy software control
Note: exact pinout, LEDs, and magnetics configuration may vary by revision; consult the latest datasheet for precise electrical details.

I don’t have the LAN9730-ABZJ pinout memorized. I can look up the official datasheet and give the exact pin count plus a concise pin-function summary (power, GND, MDIO/MDC, RMII/MII signals, TX/RX pairs, LEDs, reset/straps, crystal/ref clock, etc.). May I fetch the datasheet and return the precise details?

Manufacturer: Standard Microsystems Corporation (SMSC).
What kind of company: SMSC was a fabless semiconductor company that designs networking and connectivity ICs (e.g., Ethernet and USB controllers). It is now part of Broadcom.

LAN9730-ABZJ is a 10/100 Mbps Ethernet controller/PHY (often used as a USB-to-Ethernet bridge on embedded boards). Typical applications:
- Embedded systems and MCUs requiring wired Ethernet
- USB Ethernet adapters and dongles
- Consumer electronics with Ethernet (printers, NAS, set‑top boxes, media players)
- Industrial networking and automation (gateways, remote I/O, controllers)
- Development and evaluation boards
- Automotive telediagnostics/infotainment gateways (where the grade supports it)