LAN91C111I-NE Microchip Integrated Circuit (Quad Flat Packages) In Stock
The LAN91C111I-NE is a single-chip 10/100 Mbps Ethernet controller with integrated PHY from Microchip, offering a parallel host-bus interface in a 128-pin TQFP package. It supports both 10Base-T and 100Base-TX standards with auto-negotiation and full-duplex operation. Available for embedded networking designs in industrial, telecommunications, and consumer electronics systems.
- Manufacturer
- Microchip
- Package
- Quad Flat Packages
- Pin Count
- 128
- Lifecycle
- ACTIVE
- Datasheet
- LAN91C111I-NE Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LAN91C111I-NE?
- Integrated 10/100Base-T/TX PHY eliminating external PHY chip requirement
- Parallel host-bus interface compatible with most 8-bit and 16-bit microprocessors and DSPs
- Auto-negotiation between 10 Mbps and 100 Mbps for plug-and-play network connectivity
- Full-duplex and half-duplex operation with IEEE 802.3 compliance
- 128-pin TQFP (14x14 mm) package with integrated MAC and PHY functions
- On-chip SRAM buffer for transmit and receive packet storage
What is LAN91C111I-NE used for?
The LAN91C111I-NE is well suited for embedded systems requiring direct Ethernet connectivity without a dedicated network processor, such as industrial automation controllers, VoIP gateways, and network-enabled measurement instruments. Its parallel bus interface allows straightforward connection to processors lacking a dedicated Ethernet MAC, reducing BOM cost by integrating both MAC and PHY in a single 128-pin TQFP. Telecom access equipment and embedded routers also benefit from its 10/100 Mbps auto-negotiation capability.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the LAN91C111I-NE datasheet?
LAN91C111I-NE Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for LAN91C111I-NE?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the LAN91C111I-NE connect to a host processor, and what bus widths are supported?
The LAN91C111I-NE uses a parallel host-bus interface supporting 8-bit and 16-bit data bus widths, making it compatible with a broad range of embedded microprocessors and DSPs. The parallel interface allows direct memory-mapped register access at speeds suitable for 10 Mbps and 100 Mbps Ethernet throughput, removing the need for an SPI or RMII bridge.
What Ethernet standards does the LAN91C111I-NE support, and does it auto-negotiate speed?
The LAN91C111I-NE supports 10Base-T and 100Base-TX Ethernet per IEEE 802.3 and 802.3u. It includes an integrated auto-negotiation engine that selects 10 Mbps or 100 Mbps and half-duplex or full-duplex operation automatically when connected to a compatible switch or hub, simplifying deployment across mixed-speed networks.
For an industrial controller PCB, how much board area does the LAN91C111I-NE occupy and what does integrating the PHY save?
The LAN91C111I-NE is housed in a 128-pin TQFP measuring 14x14 mm. By integrating the Ethernet MAC and 10/100 Mbps PHY in one package, it eliminates a separate PHY IC that would add roughly 5x5 mm to the layout plus associated passive components, reducing total BOM count by approximately 10 to 20 parts on a typical industrial networking board.
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