LAN9420-NU

Controllers Overview

The LAN9420-NU is a single-chip Ethernet controller integrating a 10/100 Mbps PHY and MAC with a PCI interface. It supports 10BASE-T and 100BASE-TX standards, offering full-duplex flow control and HP Auto-MDIX. The device features descriptor-based scatter-gather DMA to reduce CPU loading and includes receive/transmit TCP checksum offload engines. It operates on a single 3.3V supply with an integrated 1.8V regulator. The component complies with PCI Local Bus Specification Revision 3.0 at 32-bit/33MHz and meets PCI Power Management Specification 1.1. It is housed in a 128-pin VTQFP package for commercial temperature ranges.

Controllers Feature Summary

• Integrated High-Performance 10/100 Ethernet Controller
• Descriptor Based Scatter-Gather DMA
• PCI Interface Compliance
• Comprehensive Power Management Features

Controllers Applications

• Cable, satellite, and IP set-top boxes
• Digital televisions
• Home gateways
• Industrial automation systems

Controllers Procurement Notes

Verify the specific ordering suffix against official Microchip documentation to confirm package type and environmental rating. Ensure compatibility with host system voltage requirements and PCI bus specifications before integration. Confirm RoHS compliance status through current manufacturer declarations.

Controllers Selection Notes

Select this component for embedded applications requiring a single-chip solution for 10/100 Ethernet connectivity via PCI. Consider the LAN9420I-NU variant if industrial temperature range operation is required instead of the commercial grade offered by the standard model.

Controllers Part Context

This part belongs to the LAN9420 family of single-chip Ethernet controllers manufactured by Microchip Technology (formerly SMSC). The series is designed to provide high-performance networking capabilities for embedded systems with reduced component count and power consumption.

Controllers Replacement Considerations

The LAN9420I-NU serves as the industrial temperature rated alternative within the same product family.