LAN7431T-I/YXX

Controllers Overview

The LAN7431T-I/YXX is a single-chip PCIe to Gigabit Ethernet controller manufactured by Microchip Technology. It integrates a PCIe 3.1 PHY supporting one lane at 2.5GT/s, a PCIe endpoint controller, and an Ethernet MAC with RGMII v1.3/v2.0 or MII interfaces for external PHY connectivity. The device supports IEEE 802.3 standards including 10/100/1000BASE-T operation. It features advanced power management compliant with PCI-PM and ASPM L0s/L1, including L1.1 and L1.2 sub-states. The component includes 1K Bytes of OTP memory, DMA controllers, and receive filtering engines. It operates within an industrial temperature range of -40°C to +85°C and utilizes a 72-pin SQFN (10x10 mm) package.

Controllers Feature Summary

• Integrates PCIe 3.1 PHY and Endpoint Controller for high-speed host connectivity
• Supports RGMII and MII interfaces for flexible external PHY integration
• Includes hardware support for IEEE 1588-2008 Precision Time Protocol
• Features comprehensive power management with wake-on-LAN capabilities

Controllers Applications

• Automotive infotainment and telematics systems
• PCIe to Gigabit Ethernet adapters and bridges
• Embedded systems requiring network connectivity
• Industrial PC and test instrumentation equipment

Controllers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Product Identification System documentation to confirm temperature grade and packaging configuration. Ensure compatibility with the required operating environment specifications before procurement. Cross-reference the datasheet revision history to confirm silicon version alignment with design requirements.

Controllers Selection Notes

Select this model when an integrated MAC with external PHY interface is required rather than a fully integrated PHY solution. Verify that the target system supports the necessary PCIe lane configuration and RGMII/MII signaling standards. Confirm that the available GPIO count meets the system's peripheral control needs and that the OTP capacity suffices for MAC address storage without external EEPROM.

Controllers Part Context

This component belongs to the LAN7430/LAN7431 family of low-power PCIe to Gigabit Ethernet controllers. Unlike the LAN7430 which integrates the physical layer transceiver, the LAN7431 provides the MAC and interface logic for connection to external PHY devices. This distinction allows for greater flexibility in media selection while maintaining similar power management and protocol processing capabilities within the same product line.

Controllers Replacement Considerations

The LAN7430 serves as a functional alternative if an integrated PHY is preferred over an external one. Verify pinout compatibility and interface differences between the SQFN packages before substitution. Ensure that the replacement part number matches the required temperature rating and automotive qualification status.