LAN9420I-NU

Controllers Overview

The LAN9420I-NU is a single-chip Ethernet controller manufactured by Microchip Technology, designed for embedded applications. It integrates a 10/100 Ethernet MAC and PHY with HP Auto-MDIX support. The device features a 32-bit, 33MHz PCI 3.0 compliant interface and descriptor-based scatter-gather DMA to reduce CPU loading. It operates on a single 3.3V power supply with an integrated 1.8V regulator. The component supports full-duplex flow control, TCP checksum offload, and comprehensive power management including Wake-on-LAN. It is housed in a 128-pin VTQFP package and is rated for an industrial operating temperature range of -40°C to 85°C.

Controllers Feature Summary

• Integrated High-Performance 10/100 Ethernet Controller with IEEE 802.3/802.3u compliance
• Descriptor based scatter-gather DMA and IRQ deassertion timer
• PCI Local Bus Specification Revision 3.0 compliant interface
• Comprehensive Power Management Features supporting PCI Power Management Interface Specification 1.1

Controllers Applications

• Cable, satellite, and IP set-top boxes
• Digital televisions and digital video recorders
• Home gateways and digital media clients/servers
• Industrial automation systems and single board PCs
• Kiosk and POS enterprise equipment

Controllers Procurement Notes

Verify the specific ordering suffix 'I' confirms the industrial temperature range (-40°C to 85°C) as distinct from commercial variants. Confirm RoHS compliance status and lead-free packaging details against the latest manufacturer datasheet revision. Ensure the 128-pin VTQFP package dimensions match the target PCB layout requirements before finalizing procurement orders.

Controllers Selection Notes

Select this model when an industrial temperature range is required for embedded network connectivity. The integrated PHY and MAC simplify design compared to discrete solutions. Verify that the host system provides a compatible 32-bit PCI bus interface. Consider the power consumption characteristics if battery-operated or low-power constraints are critical for the application environment.

Controllers Part Context

The LAN9420I-NU belongs to the LAN9420 family of single-chip Ethernet controllers. The 'I' suffix specifically denotes the industrial temperature grade variant, while the base LAN9420 typically covers the commercial range. This component serves as a complete networking solution for legacy PCI-based embedded systems requiring reliable 10/100 Mbps connectivity.

Controllers Replacement Considerations

LAN9420-NU (Commercial Temperature Range)