LAN9381-I/6XX

Controllers Overview

The LAN9381-I/6XX is a Layer 2+ managed Ethernet switch from the Microchip LAN938x series, designed for automotive and industrial applications. It integrates four 100BASE-T1 PHY transceivers and three MAC ports, supporting IEEE 802.3bw-2015 standards at data rates up to 100 Mb/s. The device features an ARM Cortex-M7 CPU subsystem, 2 MB integrated flash memory, and a hardware security engine. It operates within a supply voltage range of 1.8 V to 3.3 V and supports I2C and SPI interfaces. The component is housed in a TQFP-EP-128 package and functions reliably across a temperature range of -40°C to +105°C.

Controllers Feature Summary

• Integrates an ARM Cortex-M7 CPU subsystem with 2 MB flash for embedded processing and storage.
• Includes a hardware security engine to ensure robust data protection and integrity.
• Supports AVB/TSN bridge functionality for deterministic networking requirements.
• Provides multiple management interfaces including I2C and SPI for system control.

Controllers Applications

• Advanced Driver Assistance Systems (ADAS)
• Automotive Infotainment Systems
• Telematics Control Units
• On-board Gateway Networks

Controllers Procurement Notes

Verify the specific suffix 'I/6XX' against the manufacturer's current datasheet to confirm exact pinout, packaging variant, and qualification status. Ensure compatibility with existing board layouts regarding the TQFP-EP-128 footprint and thermal requirements. Cross-reference the revision history for any recent design changes or obsolescence notices before finalizing procurement plans.

Controllers Selection Notes

Select this component when a single-chip solution combining switching, processing, and security is required for 100BASE-T1 networks. It is suitable for designs needing Layer 2+ management capabilities without external controllers. Consider the integrated flash and CPU resources to determine if additional external memory is unnecessary. Verify that the operating temperature range meets the specific environmental constraints of the target application.

Controllers Part Context

This part belongs to the LAN938x family of 100BASE-T1 switches, which also includes models like the LAN9382, LAN9383, and LAN9384. These devices share a common architecture but vary in port counts and the inclusion of 100BASE-TX ports. The LAN9381 specifically offers four 100BASE-T1 ports, distinguishing it from five-port variants and models with mixed interface options.

Controllers Replacement Considerations

Direct substitutes within the same family include the LAN9382, LAN9383, and LAN9384, depending on whether additional ports or 100BASE-TX connectivity are needed. Verify pin-to-pin compatibility and software register mapping before swapping between these variants to ensure seamless integration.