KSZ8873MMLI - 3-Port 10/100 Ethernet Switch | Microchip
Référence : KSZ8873MMLI ✓ ActifKSZ8873MMLI Présentation
An Ethernet switch is a network-interface device that connects multiple endpoints through one or more internal ports and determines where each frame should be forwarded. Within the network hierarchy, the KSZ8873MMLI combines Ethernet switching, physical-layer transceivers, and host-facing management interfaces in a single integrated circuit. This integration reduces the number of separate interface components required in small industrial, automotive, and embedded Ethernet designs.
The primary headline capabilities are three 10/100 Mb/s switch ports, integrated PHYs, and two MII interfaces. The 64-pin LQFP package provides 64 physical connections for power, Ethernet interfaces, management signals, clocking, and configuration functions. According to the manufacturer product page, the KSZ8873 family is intended for low-port-count, cost-sensitive, power-efficient switch systems rather than high-port-count enterprise switching.
Management and diagnostics distinguish the KSZ8873 from a basic unmanaged switch. Its cable-diagnostics feature supports fault analysis on copper links, while programmable LED indication allows port activity or link status to be presented through the device's LED controls. The family also supports MII and RMII, allowing it to interface with Ethernet controllers using either parallel management-oriented signals or the reduced pin-count RMII convention.
Typical uses include compact embedded Ethernet switches, automotive Ethernet connectivity, industrial control networks, and communication equipment requiring three integrated 10/100 Mb/s ports. The automotive-rated 200 Mb/s variant is suited to cost-sensitive vehicle-network designs where multiple Fast Ethernet links must be consolidated without using a large backplane switch.
Designers should confirm the exact pin functions, clock requirements, interface mode, and external component requirements from the manufacturer datasheet before layout. MII and RMII are not automatically interchangeable at the board level, and the two MII interfaces on this device require careful signal and clock routing.
This page combines the family-level functional information with the exact KSZ8873MMLI package identity, sourcing guidance, design notes, and an explicit treatment of replacement constraints. It also distinguishes confirmed product facts from engineering information that still requires validation against the manufacturer documentation.
Alternatives de remplacement direct pour KSZ8873MMLI — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Aucune alternative de remplacement direct disponible pour ce produit.
Demander des alternativesKSZ8873MMLI Valeurs maximales et caractéristiques électriques
| Product Type | 3-port managed Ethernet switch with integrated PHYs |
| Ethernet Port Count | 3 ports |
| Supported Ethernet Rate | 10/100 Mb/s per port |
| Aggregate Variant Data Rate | 200 Mb/s |
| MII Interface Count | 2 interfaces |
| RMII Support | Supported |
| Management Interface | I2C and SPI |
| Cable Diagnostics | Supported |
| LED Configuration | Programmable LED indication |
| Power Management Feature | Low-power mode |
| Automotive Qualification | Automotive-rated variant |
| Package Type | 64-pin LQFP |
| Package Dimensions | 10 mm x 10 mm |
| Type de montage | Surface mount |
| Statut RoHS | RoHS compliant |
Guide de configuration des broches du KSZ8873MMLI 10 mm x 10 mm
Configuration des broches du KSZ8873MMLI (boîtier 10 mm x 10 mm). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour KSZ8873MMLI.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
KSZ8873MMLI convient pour 6 applications: Compact Automotive Ethernet Switching, Industrial Control Network Gateway, Embedded Equipment Network Backbone, Industrial IoT Edge Gateway, Communication Equipment Network Interface, Networked Sensor and Controller Hub.
Compact Automotive Ethernet Switching
The KSZ8873MMLI fits compact vehicle-network designs that need three integrated 10/100 Mb/s Ethernet connections in a 64-pin LQFP package. Its three integrated PHYs reduce the need for separate Ethernet transceiver arrangements, while cable diagnostics can support link troubleshooting and programmable LED indication can expose port status to the vehicle controller. The identified automotive-rated, 200 Mb/s variant targets cost-sensitive networking where three Fast Ethernet links are needed rather than a larger switched-port count. Before releasing a design, verify the exact operating-temperature range, AEC-Q100 grade, electrical limits, magnetic-component requirements, and network topology in the manufacturer qualification and application information.
Recommandé
Industrial Control Network Gateway
The KSZ8873MMLI is suitable for a low-port-count industrial gateway that must consolidate several Fast Ethernet endpoints onto a host interface. Three integrated 10/100 Mb/s PHYs provide the physical network ports, while two MII interfaces and RMII support offer distinct host-connection options for different processor architectures. I2C and SPI management can be used to configure or monitor switch behavior, and low-power mode is useful where the system does not need continuous maximum activity. The appropriate PCB implementation must preserve the required clock and isolation layout, select the intended MII or RMII configuration, and include the external passive network specified by the manufacturer.
Recommandé
Embedded Equipment Network Backbone
The KSZ8873MMLI can form the local Fast Ethernet backbone of embedded test, communications, or instrumentation equipment. Its three 10/100 Mb/s ports allow multiple external devices to connect through a managed switch function rather than through three unrelated interface sections. Cable diagnostics add practical value for field maintenance, while programmable LEDs let the host communicate link or activity information without fixing every indicator behavior in hardware. The MII and RMII choices permit architectural flexibility, although they are not layout-equivalent. Designers should use the manufacturer's reference circuitry, verify the reference-clock plan, route high-speed interfaces away from noisy switching nodes, and validate the completed link across all supported cable configurations.
Recommandé
Industrial IoT Edge Gateway
The KSZ8873MMLI suits an edge gateway that must accept three Fast Ethernet connections while managing traffic locally. The integrated PHYs and managed-switch architecture consolidate physical-layer functions in one 64-pin LQFP device, while I2C or SPI can support software configuration and status monitoring. The three-port limit should be matched to actual gateway demand because the KSZ8873 family is designed for low-port-count systems rather than high-density enterprise switching. A robust design should define thermal and power budgets, use the manufacturer's recommended magnetics or termination arrangement, isolate interface clocks appropriately, and confirm startup behavior for attached devices before deploying the gateway in an IoT installation.
Recommandé
Communication Equipment Network Interface
The KSZ8873MMLI can support a small communication device with three physical Fast Ethernet ports and a host-facing management path. Its two MII interfaces can accommodate parallel Ethernet connectivity, while RMII provides an alternative for systems designed around a reduced signal interface. The MII and RMII paths require deliberate board-level selection rather than automatic interchangeability, and the reference clock must be distributed according to the manufacturer guidance. Cable diagnostics and programmable LED indication improve serviceability in deployed equipment. Final integration should confirm the exact pin assignments, magnetics, termination, reset behavior, and supported operating conditions from the KSZ8873MMLI documentation.
Recommandé
Networked Sensor and Controller Hub
The KSZ8873MMLI can consolidate three 10/100 Mb/s sensor or controller connections in a distributed monitoring hub. Three integrated PHYs simplify the physical Ethernet layer, while cable diagnostics help identify wiring faults across long industrial links and programmable LEDs provide local status indication. The device's low-power mode can assist energy management in installations where continuous activity is not always required. The hub should be designed around the manufacturer's supported media and external-network requirements, with controlled clock distribution and careful separation of Ethernet traces from power converters and sensor analog circuits. Confirm operating-temperature and automotive requirements if the hub will be deployed in either environment.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour KSZ8873MMLI — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit |
|---|---|
| Brand | Microchip Technology |
| Package | 64-pin LQFP, 10 mm x 10 mm |
| Ethernet Port Count | 3 ports |
| Supported Ethernet Rate | 10/100 Mb/s per port |
| Aggregate Variant Data Rate | 200 Mb/s |
| MII Interface Count | 2 interfaces |
| RMII Support | Supported |
| Management Interface | I2C and SPI |
| Cable Diagnostics | Supported |
| Automotive Rating | Automotive-rated variant |
Notes de conception
Select the MII or RMII architecture before placing the interface circuitry. The two MII paths require substantially more parallel routing than RMII, and the reference clock must follow the manufacturer's topology and return-path guidance. Keep copper and component placement consistent with the recommended high-speed layout because changing interface mode after layout is not a simple firmware configuration change.
Use the manufacturer reference schematic and pin-description table to place the supported external network, magnetic components or terminations, decoupling, and configuration components. The 64-pin LQFP footprint does not determine the complete external circuit by itself. Keep the Ethernet pairs routed as controlled-impedance connections and avoid introducing discontinuities beneath the device or near its interface pins.
Do not treat another KSZ8873 order code as a direct substitute without verifying its exact package, pinout, electrical limits, interface configuration, and qualification. The family includes MML, MLL, FLL, and RLL options, while KSZ8873MMLI is identified as the 64-pin LQFP automotive variant. Confirm the complete order code on the schematic, BOM, and package drawing to prevent an assembly mismatch.
Plan the power and Ethernet layout together to reduce radiated emissions and susceptibility problems. Place input decoupling at the relevant supply pins, keep switching-converter loops compact, separate noisy power paths from interface references, and use the manufacturer's recommended termination network. If the board combines the KSZ8873MMLI with wireless, motor-control, or high-current circuitry, verify the assembled enclosure and cable configuration during EMC testing.
Informations de conformité
RoHS compliance is identified in the manufacturer-related product record. The device is described as an automotive-rated variant, but the exact AEC-Q100 qualification grade, REACH status, lead-free status, halogen-free status, and conflict-minerals declaration require confirmation from Microchip documentation.
