KSZ8873MLLJ

Controllers Overview

The KSZ8873MLLJ is an industrial-grade, highly integrated 3-port Layer 2 managed switch with PHYs. It features two 10BASE-T/100BASE-TX transceiver ports and one MII interface. The device supports IEEE 802.1q VLAN for up to 16 groups, IEEE 802.1p/q tagging, and IPv4/IPv6 QoS prioritization. It includes a non-blocking switch fabric with a 1K MAC address lookup table and store-and-forward architecture. Power management features include energy-detect mode, dynamic clock tree shutdown, and per-port software power-save. The component operates within an extended temperature range of –40°C to +125°C and is available in a 64-pin LQFP package.

Controllers Feature Summary

• Supports IEEE 802.1q VLAN and programmable rate limiting on ingress and egress ports.
• Includes Microchip LinkMD TDR-based cable diagnostics for identifying copper cabling faults.
• Provides comprehensive configuration access via SMI, MIIM, SPI, I2C, and I/O strapping.
• Features port mirroring, monitoring, sniffing, and 34 MIB counters per port for statistics gathering.

Controllers Applications

• VoIP Phone
• Automotive systems
• Industrial Control
• SOHO Residential Gateway
• Wireless LAN Access Point + Gateway

Controllers Procurement Notes

Verify the specific ordering suffix 'J' confirms the industrial temperature grade (-40°C to +125°C) as distinct from commercial variants. Confirm RoHS compliance status through official documentation. Ensure the selected package matches the 64-pin LQFP requirement for your PCB layout. Check for any applicable errata sheets that may detail operational differences or recommended workarounds for current silicon revisions.

Controllers Selection Notes

Select this component when an industrial temperature rating is required for 10/100 Mbps switching applications. The KSZ8873MLLJ is suitable for designs needing advanced QoS, VLAN support, and cable diagnostics. Consider the power supply requirements, specifically the single 3.3V supply with internal 1.8V LDO for VDDIO. Evaluate if the integrated PHYs and MACs meet the port count and interface needs without external components.

Controllers Part Context

The KSZ8873MLLJ is the industrial version of the KSZ8873MLL. It shares the same functional specifications but operates over the extended temperature range of –40°C to +125°C. This variant is designed for environments where standard commercial temperature ranges are insufficient. It maintains the low power consumption and advanced power management features of the base model while ensuring performance stability in extreme heat.

Controllers Replacement Considerations

The KSZ8873MLL serves as the commercial temperature equivalent. For higher port counts, consider the KSZ8893 series. Verify pin compatibility and register mapping before substituting with other managed switch ICs from different manufacturers.

Controllers FAQ

What is the primary difference between the KSZ8873MLLJ and KSZ8873MLL?

The KSZ8873MLLJ is the industrial version operating from –40°C to +125°C, whereas the KSZ8873MLL is the commercial version with a narrower temperature range.

Does the KSZ8873MLLJ support fiber optic connections?

No, the device supports only 10BASE-T and 100BASE-TX copper connections. Cable diagnostics are valid only for copper links.

How does the KSZ8873MLLJ handle Auto MDI/MDI-X?

It supports HP Auto MDI/MDI-X by default, which automatically detects and corrects straight-through and crossover cables. This feature can be disabled via port control registers.