LAN91C113-NU

LAN91C113-NU is a PCI-based Ethernet controller from the LAN91Cxxx family (originally SMSC, now Microchip). It is designed to add wired Ethernet to embedded systems and PCs.
Key points:
- 10/100 Mbps Ethernet with auto-negotiation and full/half duplex support under a PCI 32‑bit bus interface.
- Integrated MAC; connects to an external PHY via an MII/PHY interface (some variants use an internal PHY).
- Has TX/RX data paths and a register-based control interface for MAC address filtering, flow control, interrupts, etc.
- Commonly used in embedded boards and low-end Networking/industrial devices; supported by standard drivers (Linux, Windows, etc.).
Notes:
- The “NU” suffix indicates a specific package/ revision variant; consult the datasheet or distributor for exact features, voltages, and pinout.
- Typical implementation requires a PCI host and a PHY (or an on-board PHY) and appropriate power/clocking as per the datasheet.

Do you mean a pin-for-pin drop-in replacement or just a functional equivalent (same MAC/PHY features)? Which package and interface are you using?

Here are the core features of LAN91C113-NU (SMSC LAN91C113 Fast Ethernet Controller):
- 10/100 Mbps Ethernet with PCI interface
- MAC and PHY (IEEE 802.3/802.3u) support; supports 10BASE-T and 100BASE-TX
- Auto-negotiation with full/half duplex operation
- PCI bus interface (32‑bit, supports bus-mastering)
- MDIO/MDC management interface for PHY control
- On-chip TX/RX data paths with buffering and DMA/descriptor-based transfers
- Interrupts for TX/RX, errors, link changes; multicast and promiscuous mode
- Power-management features and optional low-power modes
Concise, feature-focused overview suitable for quick reference.

Manufacturer: Microchip Technology Inc. (the LAN91C113 family was originally made by Standard Microsystems Corporation (SMSC) and is now sold under Microchip following SMSC’s acquisition).
What kind of company: Microchip Technology is an American semiconductor company that designs and supplies microcontrollers, analog and mixed-signal ICs, and other embedded and networking semiconductor products (publicly traded, headquartered in Chandler, Arizona).

LAN91C113-NU is a 10/100 Mbps Ethernet controller (MAC+PHY) for embedded systems, providing Ethernet via a local bus (PCI/ISA) with DMA to a host MCU/CPU. Typical application areas include:
- Industrial automation and PLC/data‑acquisition systems
- Embedded gateways and networking bridges
- Point‑of‑sale terminals and kiosks
- Networked printers and multifunction devices
- IP cameras and surveillance gear
- Consumer electronics (set‑top boxes, media players, smart TVs)
- Small office/home office NICs and other cost‑sensitive devices needing Ethernet connectivity

The LAN91C113-NU is supplied in a 68-pin PLCC (Plastic Leaded Chip Carrier) package. Check the LAN91C113 datasheet for exact mechanical dimensions and pinout.