Microchip 128-Pin TQFP Controller IC 3.3 V 100 Mbps ISA Full Duplex/Half Duplex LAN91C111-NU

Microchip LAN91C111-NU is a high-performance 128-pin TQFP controller IC designed for Ethernet interface applications. Operating at 3.3 V, it supports a maximum data rate of 100 Mbps, adhering to the IEEE 802.3u standard. This IC interface uses the ISA bus and enables both full duplex and half duplex communication modes, making it flexible for various network configurations.

The LAN91C111-NU includes an internal loopback mode, enabling self-testing and diagnostics without external equipment. It is housed in a compact surface mount TQFP package measuring 16 mm length and width with a height of 1.2 mm, allowing for dense PCB layouts.

Its operating temperature range of 0°C to 70°C ensures reliable performance in many industrial and commercial environments. The IC draws 140 mA supply current and operates at a fixed 3.3 V supply voltage, making it compatible with modern low-voltage digital systems.

This controller IC is suitable for industrial machinery, telecommunications, data communication systems, network equipment, and other applications requiring efficient Ethernet connectivity. While it does not comply with automotive standards, it delivers robust communications performance for laboratory, manufacturing, and commercial networking tasks.

Supports IEEE 802.3u Ethernet standard and 100 Mbps data rate. Integrated full duplex and half duplex communication modes provide flexibility. Compact 128-pin TQFP surface mount package allows integration in tight PCB layouts.

Operates on 3.3 V supply voltage with a 140mA current draw. Internal loopback capability facilitates diagnostics and testing. Operating temperature range of 0°C to 70°C suits many environments. Designed for industrial, laboratory, and commercial Ethernet network applications.

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