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KSZ8863FLL

KSZ8863FLL - 3-Port 10/100 Managed Ethernet Switch | Microchip Technology

The Microchip Technology KSZ8863FLL is a highly integrated three-port 10/100 managed Ethernet switch with integrated PHYs, one 100BASE-FX fiber port, one 10/100BASE-TX copper port, and one additional 10/100 port. It supports 10/100 Mbps Ethernet switching, MII connectivity, and CPU control through I2C or SPI. The device is packaged in a 48-LQFP package measuring 7 mm by 7 mm. According to the verified product description, the KSZ8863FLL is intended for low-port-count, cost-sensitive, and power-efficient 10/100 Mbps switch systems. An Ethernet switch is a networking semiconductor that connects multiple Ethernet endpoints and forwards frames between ports using integrated physical-layer transceivers, or PHYs. The managed-switch category adds configuration and control functions beyond basic frame forwarding, including port management, VLAN support, QoS priority handling, and CPU-controlled data interfaces. The KSZ8863FLL belongs to the switch-on-a-chip family, combining multiple Ethernet ports and management functions into one device rather than requiring separate discrete PHY and switch components. Key verified features include a three-port architecture, integrated PHYs, 100BASE-FX fiber support, 10/100BASE-TX copper networking, one MII interface, and CPU control and data interfaces. The product is identified by DigiKey as an Ethernet Switch with a 1.8 V, 2.5 V, or 3.3 V supply option and a 48-LQFP 7 x 7 mm package. Microchip describes the KSZ8863 family as supporting switch management, port and tag-based VLAN, QoS priority, and CPU control, which makes it suitable for compact embedded-network equipment. The KSZ8863FLL is positioned for industrial, communications, and embedded Ethernet designs that need copper and fiber connectivity in a small package. Its integrated approach can reduce board-level component count and simplify the network architecture compared with a discrete switch implementation. The MII interface allows connection to a host processor or another Ethernet-compatible controller, while I2C or SPI management access supports configuration from a microcontroller or embedded system. Designers should verify the exact pinout, transceiver requirements, clocking, magnetics, and fiber-interface implementation against the manufacturer datasheet before layout. Although the MLL, FLL, and RLL variants belong to the same KSZ8863 family, their supported interfaces and features differ, so substitution must be checked carefully. The verified data does not provide complete electrical limits, pin names, or pricing, and those values are marked as needed rather than estimated. This page combines the verified KSZ8863FLL product identity, package information, application positioning, and datasheet references with practical selection guidance. It also distinguishes direct family substitutions from broader Ethernet-switch alternatives that may require PCB, firmware, or interface changes.

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KSZ8863FLLI

KSZ8863FLLI - 3-Port 10/100 Managed Ethernet Switch | Microchip Technology

The Microchip Technology KSZ8863FLLI is a highly integrated 3-port 10/100 managed Ethernet switch with fiber support, packaged in a 48-LQFP 7x7 mm package. It is designed for cost-sensitive, power-efficient low-port-count network systems and provides integrated 10/100 Ethernet PHYs with I2C and SPI control interfaces. The device supports 10 Mbps and 100 Mbps data rates and is identified as a 3-port Ethernet switch controller with Base-FX/T/TX PHY functionality. An Ethernet switch controller is an interface IC that integrates multiple physical-layer transceivers and switching logic into one device. It sits within the hierarchy of Ethernet interface ICs, network controllers, semiconductors, and broader communications equipment. By combining copper and fiber-oriented connectivity in a compact package, the KSZ8863 family is intended to reduce external component count in embedded gateways, industrial controllers, access equipment, and compact network appliances. The KSZ8863FLLI includes support for optical fiber, cable diagnostics, programmable LED indication, and a low-power operating mode. Its managed-switch architecture supports controlled network segmentation and status indication, while the integrated PHYs simplify connections to 10/100BASE-T and fiber-capable downstream equipment. The I2C and SPI interfaces provide host access for configuration and management functions. According to the manufacturer product description, the KSZ8863 series is cost-sensitive, power efficient, and optimized for low-port-count switching systems. The family variants use different suffix options to address product and ordering requirements while retaining a closely related 3-port 10/100 managed-switch architecture. The KSZ8863FLLI is supplied in a 48-LQFP package, enabling conventional surface-mount assembly in industrial and embedded equipment. Its operating temperature range is specified as -40°C to +85°C, making it suitable for extended industrial environments. The 100 Mbps data rate and fiber support distinguish it from basic single-port Ethernet PHY devices. Typical applications include industrial Ethernet gateways, serial-to-Ethernet equipment, access-point controllers, factory automation nodes, and compact embedded network appliances. Because the device combines managed switching, integrated PHYs, programmable LEDs, and low-power operation, it can simplify board design where a small network topology must operate without a discrete switch and multiple PHY packages. The main design consideration is power and signal integrity: place the device and its decoupling network according to the manufacturer reference layout, keep high-speed traces controlled, and validate Ethernet magnetics or fiber interfaces in the final board design. Also confirm the exact fiber, LED, and management configuration for the selected KSZ8863 variant before production release. This product page combines the verified manufacturer and distributor information, identifies package and interface details, and provides practical guidance for Ethernet switch design, sourcing, and qualification. The documented alternatives are organized by manufacturer priority and intended for engineering comparison rather than as automatic substitutions without footprint and configuration verification.

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KSZ8863MLL

KSZ8863MLL 3-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip Technology KSZ8863MLL is a highly integrated 3-port 10/100 Mbps managed Ethernet switch with integrated PHYs, one MII interface, and CPU control, supplied in a 48-lead LQFP package. It is designed for compact, cost-sensitive, power-efficient 10/100BASE-T networks. The KSZ8863MLL combines two copper Ethernet PHYs supporting 10BASE-T and 100BASE-TX with a third port that can operate through the MII interface or bypass mode. An Ethernet switch IC is a network-interface device that connects multiple Ethernet nodes through integrated PHYs and internal switching logic. The KSZ8863MLL belongs to the Ethernet switch family, which sits within network interface semiconductors and broader embedded communication systems. Its managed-switch features include port- and tag-based VLAN support, QoS priority, link management, and CPU-controlled configuration through I2C or SPI. These capabilities make it suitable when a design needs more deterministic LAN behavior than an unmanaged switch provides. The MLL variant is intended for 2.5 V and 3.3 V systems and supports 10BASE-T and 100BASE-TX operation on two PHY ports. The third port includes an MII interface for connection to a host processor or another Ethernet controller. The supplied product information identifies the device as a 48-LQFP (7x7 mm) part with a 48-pin package and a 100 Mbps Ethernet switch classification. The KSZ8863MLL is useful in industrial embedded systems, compact controllers, factory equipment, and network appliances where three Ethernet paths are needed without implementing a full-size switching ASIC. Its small package and integrated PHYs reduce external PHY count and simplify board design. Configuration can be handled through the CPU interface, while VLAN and QoS features help organize traffic and improve network behavior. Designers should follow the manufacturer datasheet and hardware design checklist for pin assignments, reset timing, clock requirements, magnetic-component selection, and power sequencing. The reset input is active-low, and a hardware reset is required after power-up according to the KSZ8863MLL hardware design checklist. Board layout, magnetics isolation, impedance-controlled traces, and bypass-capacitor placement are critical because Ethernet interfaces are sensitive to return-path and signal-integrity issues. This page combines the verified manufacturer product information, distributor identification, package details, pricing reference, and practical design guidance for engineers evaluating the KSZ8863MLL. It is intended to help determine whether this 3-port Ethernet switch fits a specific embedded networking design before consulting the complete manufacturer documentation.

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KSZ8863MLLI

KSZ8863MLLI - 3-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip Technology KSZ8863MLLI is a highly integrated, three-port managed Ethernet switch with 10/100 Mbps support, I2C and SPI host interfaces, one MII interface, and fiber support in a 48-pin LQFP package measuring 7 mm by 7 mm. It is designed for compact, cost-sensitive, and power-efficient networking systems. An Ethernet switch is a semiconductor that connects multiple local network nodes and manages traffic between network ports. This device belongs to the managed Ethernet switch hierarchy, where integrated PHYs, a switching fabric, and host-register control support small embedded networks without requiring a discrete Ethernet switch design. The KSZ8863 family combines copper and fiber connectivity options in a small package. Three integrated 10/100 Mbps ports support low-port-count network designs, while auto-negotiation follows Clause 28 of the IEEE 802.3u specification. That protocol lets connected devices select a common operating mode. I2C and SPI interfaces provide host access to device functions, while the MII interface supports connection to an external network controller. Advanced power management is specifically identified as a family feature for reducing system power consumption. The KSZ8863MLLI is one of three internal-bonding configurations designated MLL, FLL, and RLL. Microchip states that these configurations are not interchangeable because their internal bonding differs and the mode cannot be changed through an external pin or register setting. The selected configuration therefore remains a manufacturing and design-selection decision rather than a runtime configuration option. Typical uses include industrial Ethernet control, embedded gateways, industrial equipment networking, compact network switches, and systems that need a managed three-port Ethernet switch with copper or fiber uplink support. The 48-LQFP construction is suitable for conventional surface-mount PCB assembly rather than the very smallest leadless packages. Designers should treat the MLL suffix as functionally significant, preserve the manufacturer's recommended decoupling and clock circuitry, and route high-speed Ethernet and MII signals with controlled impedance. Before layout release, use the manufacturer pin-description table and application schematic to assign all 48 pins, especially power, ground, reset, management, PHY, and media-interface signals. This page organizes the KSZ8863MLLI's verified switching, interface, packaging, and compliance characteristics, clarifies why the MLL, FLL, and RLL variants cannot be substituted, and provides practical application guidance for engineers designing compact managed Ethernet equipment.

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KSZ8863RLL

KSZ8863RLL - 3-Port 10/100 Ethernet Switch | Microchip

The Microchip Technology KSZ8863RLL is a cost-sensitive, power-efficient, highly integrated three-port 10/100 managed Ethernet switch with integrated PHYs and fiber support. The device is available in a 48-LQFP 7x7 mm package and is configured through I2C or SPI interfaces, as identified by the distributor listings and manufacturer product information. It is intended for low-port-count Ethernet systems requiring integrated copper and fiber connectivity. An Ethernet switch is a network-interface semiconductor that receives Ethernet frames on one port and forwards them to another port using address-based learning. The 10/100 designation refers to support for 10 Mbps and 100 Mbps Ethernet rates, while the three-port architecture consolidates multiple physical-layer connections into one device. In the system hierarchy, the KSZ8863RLL is an Ethernet interface IC, a network interface controller, and ultimately a communications semiconductor. The verified product information identifies the KSZ8863 family as a managed Ethernet switch with integrated 10/100 PHYs, I2C and SPI configuration interfaces, and fiber support. These capabilities allow a compact product to combine several network ports without requiring a separate switch controller and individual PHY devices. Its three-port organization is useful in industrial, embedded, communications, and edge-network equipment where a small number of Ethernet links must be managed efficiently. The KSZ8863RLL uses a 48-LQFP package measuring 7x7 mm according to the distributor listing. Package-level power, temperature, clock, and Ethernet-magnetics requirements must be confirmed in the manufacturer datasheet and KSZ8863RLL Hardware Design Checklist. Those documents are especially relevant to differential trace routing, magnetic-component placement, supply decoupling, and the reference-clock circuit. Typical deployments include three-port industrial Ethernet controllers, embedded network gateways, compact PLC communication modules, factory-floor connectivity, and OEM equipment requiring copper plus optional fiber links. The managed-switch architecture also makes the device suitable for systems that need more controlled network segmentation than an unmanaged repeater provides. For PCB implementation, preserve the pin assignments and reference-clock layout recommended by Microchip. The hardware checklist identifies pin 10 as the clock-circuit output and requires a capacitor to ground, while crystal, stray-capacitance, and load-capacitance values must be selected together. Ethernet magnetics, controlled-impedance routing, grounding, and isolation also require careful validation in the final board design. This page consolidates verified product identity, package information, pricing data, family substitutions, and practical hardware-design guidance. It also distinguishes documented KSZ8863 variants from unsupported replacement claims, helping engineers evaluate compatibility without treating every similar Ethernet switch as a true pin-to-pin substitute.

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KSZ8863RLLI

KSZ8863RLLI - 3-Port 10/100 Switch w/ RMII | Microchip

The Microchip Technology KSZ8863RLLI is a highly integrated 3-port 10/100 managed Ethernet switch with PHYs, supporting one RMII interface and packaged in a 48-pin LQFP (7x7 mm) for industrial temperature operation. It delivers 100 Mbps data rate per port, integrates three 10/100BASE-TX PHYs with on-chip termination, and provides a non-PCI CPU interface via I2C or SPI to a host processor. The device targets cost-sensitive, power-efficient industrial and embedded networking designs that need a small footprint, low port count managed switch. A managed Ethernet switch is a Layer 2 network device that uses a switch fabric to forward Ethernet frames between connected ports based on MAC address tables, while providing management features such as VLAN, QoS, port mirroring, and rate limiting. The KSZ8863RLLI sits in the hierarchy: Ethernet switch -> managed switch -> Layer 2 switch -> networking IC -> semiconductor. It is part of the IEEE 802.3 / 802.3u family of Fast Ethernet devices, supporting auto-negotiation per Clause 28 of the IEEE 802.3u specification. Key features include integrated 10/100BASE-TX PHYs with HP auto-MDI/MDIX (no external magnetics on the PHY side), support for fiber mode on Port 3, an RMII interface to an external MAC or host, an I2C/SPI host management interface, advanced power management including energy-detect mode, and 1.4 KB packet buffer per port. The device operates from -40C to +85C industrial temperature range. Architecture is built on a store-and-forward switch fabric with 1 Gbps total bandwidth, supporting wire-speed non-blocking forwarding on all three ports. The device includes IEEE 802.1Q VLAN, 802.1p QoS priority queues, port-based access control, and IGMP snooping for multicast filtering. The 48-pin LQFP package allows simple 4-layer PCB assembly using standard lead-free reflow. Typical applications include industrial Ethernet sensor networks, IP surveillance cameras with daisy-chained switch ports, building automation backbones, factory automation PLCs, and embedded IoT gateways requiring multiple Ethernet ports. The integrated PHYs and small package reduce BOM cost and PCB area versus discrete MAC+PHY solutions. When designing with this device, designers should follow the KSZ8863RLL Hardware Design Checklist from Microchip for crystal and magnetics selection. The 25 MHz reference clock drives the internal PHYs; PHY-to-MAC connection should use impedance-controlled traces per IEEE 802.3 100BASE-TX. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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KSZ8863RLLI-TR

KSZ8863RLLI-TR - 3-Port 10/100 Ethernet Switch w/ PHY | Microchip

The Microchip Technology KSZ8863RLLI-TR is an integrated 3-port 10/100 Mbps managed Ethernet switch with three on-chip PHYs, I2C and SPI host interfaces, and a 48-pin LQFP (7x7 mm) package. It is designed for cost-sensitive, low port-count, power-efficient switching systems, supports IEEE 802.3/802.3u, and provides advanced power management including Energy Efficient Ethernet (EEE) Actiphy and Wake-on-LAN. An Ethernet switch IC is a Layer-2 networking semiconductor that interconnects multiple Ethernet ports within a system, performing MAC address learning, frame forwarding, and QoS prioritization. The KSZ8863 belongs to the unmanaged/lightly-managed switch IC family within the broader Ethernet controller category, sitting alongside standalone PHY transceivers and full Layer-2+ managed switches in the network IC taxonomy. Compared to a discrete PHY plus MAC, an integrated switch-on-chip reduces board area, BOM, and power while adding hardware-based QoS. Key features include three integrated 10/100Base-TX PHYs with HP Auto-MDI/MDI-X, IEEE 802.1Q VLAN tagging support, QoS/priority queues with 802.1p, port-based rate limiting, and per-port cable diagnostics. The RLLI suffix indicates the LQFP-48 industrial-temperature variant (-40C to +85C) supplied in tape-and-reel packaging. The device operates from a single 3.3 V supply with typical power consumption around 0.5 W, and includes a 25 MHz reference clock input. Internally the KSZ8863 uses a store-and-forward architecture with a 1.5 Mbit shared packet buffer, supports RMII for an external MAC or uplink port, and offers PHY loopback for diagnostics. The integrated PHYs include on-chip termination resistors and adaptive equalization, simplifying magnetics selection. Typical applications include industrial Ethernet daisy-chaining, IP cameras and surveillance switches, building automation gateways, factory-floor sensor aggregation, automotive Ethernet gateway modules, and any embedded system that needs a small, low-power 3-port switch. When designing with the KSZ8863RLLI-TR, follow the KSZ8863RLL Hardware Design Checklist for magnetics, RBIAS resistor, and 25 MHz crystal layout. Use short, impedance-controlled 100-ohm differential traces between the PHY outputs and the magnetics, and provide adequate bulk decoupling on each AVDD supply pin. This page synthesizes distributor pricing, pin-compatible alternatives, and practical design notes that are not found in the manufacturer datasheet alone, helping embedded network designers select and source the right switch IC for their application.

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KSZ8864CNXC

KSZ8864CNXC - 4-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip Technology KSZ8864CNXC is a highly integrated, Layer 2-managed 4-port 10/100 Mbps Ethernet switch with two MAC interfaces supporting MII or RMII operation, packaged in a 64-QFN 8 x 8 mm package. The device is intended for cost-sensitive embedded networking systems that require multiple Fast Ethernet ports in a compact surface-mount footprint. An Ethernet switch is a network-interface IC that forwards Ethernet frames between connected devices and an upstream controller or network segment. The KSZ8864 belongs to the managed switch, Ethernet interface controller, network interface IC, and semiconductor hierarchy. Its Layer 2 management function provides controlled frame handling at the edge of an embedded network rather than requiring a separate bridge or complex external switching hardware. Key characteristics include four integrated 10/100 Base-T/TX ports, two MACs with selectable MII or RMII interfaces, on-chip termination, low power consumption, and a 64-QFN package measuring 8 x 8 mm. These characteristics make the device suitable where space, interface count, and system cost are important constraints in industrial, automotive, communications, and embedded-control products. Technically, the KSZ8864 combines four Fast Ethernet PHYs with managed Layer 2 switching functions and host-facing MAC interfaces in one package. MII provides a parallel interface with separate data paths, while RMII reduces the number of required host-interface signals. The two MACs support designs that need more than one upstream or management connection. According to the Microchip KSZ8864CNX/RMNUB datasheet, the family includes on-chip termination to reduce external component count and support compact 10/100 Mbps switch systems. Typical applications include industrial Ethernet gateways, vehicle network interfaces, embedded routers, serial-to-Ethernet equipment, industrial controllers, set-top networking, and compact embedded access systems. The device is especially relevant when a design needs four Fast Ethernet ports, two host interfaces, managed Layer 2 behavior, and a small package on the same PCB. The primary design consideration is interface and power planning. The PCB must route MII or RMII signals according to the selected host-interface mode, provide appropriate decoupling, and preserve controlled-impedance paths where timing or EMI performance matters. Because this is a digital interface IC rather than a power semiconductor, a Safe Operating Area chart is not applicable. This product overview combines the manufacturer’s switch description, verified package and interface facts, replacement analysis, and practical implementation guidance. It also distinguishes the base device from automotive and temperature-grade ordering variants that can share the same 64-QFN footprint but serve different qualification requirements.

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KSZ8864CNXI

KSZ8864CNXI - 4-Port 10/100 Ethernet Switch | Microchip

The Microchip Technology KSZ8864CNXI is a highly integrated, Layer 2 managed four-port Ethernet switch with 10/100 Mbps ports, two MAC interfaces, and MII or RMII host connectivity in a 64-QFN package measuring 8 mm by 8 mm. It supports cost-sensitive 10/100 Mbps switch systems while integrating on-chip termination and a compact footprint for space-constrained embedded networking equipment. An Ethernet switch is a Layer 2 network semiconductor that forwards Ethernet frames between multiple physical ports according to MAC addresses. The KSZ8864 family belongs to the hierarchy of Ethernet interface controllers, network interface controllers, integrated circuits, and semiconductors. Its four-port managed architecture allows one embedded processor to connect through two MAC interfaces while the switch handles traffic between attached nodes, reducing the number of physical network interfaces required by the host system. The KSZ8864 supports 10/100 Mbps operation and provides MII and RMII interfaces for connection to a network processor, microcontroller, or application-specific processor. MII offers separate parallel paths for transmit and receive data, while RMII uses a reduced pin interface suitable for designs where connector count and board area are important. The manufacturer describes the family as optimized for cost-sensitive switch systems, with on-chip termination, low power consumption, and a small package intended to reduce system cost. The device integrates two MAC interfaces and four Ethernet ports in one network IC. This consolidation can shorten the design path for industrial control, automotive networking, embedded appliances, communications equipment, and network bridges. The KSZ8864 family is listed by the manufacturer as AEC-Q100 automotive qualified, although orderable suffix and grade details should be confirmed for each specific package configuration before use in a production vehicle design. Typical Ethernet designs use the KSZ8864 as the central Layer 2 switching element, with external magnetics and RJ45 or other network connectors on the port side. The host processor connects through one of the MII or RMII interfaces. Configuration and status information can be handled through the management interface, allowing firmware to control port parameters and monitor link state. Network isolation, instrumentation, and embedded service-port products are also natural fits because four ports can replace several discrete Ethernet interface arrangements. When designing around the KSZ8864CNXI, preserve the manufacturer’s recommended decoupling and layout guidance and account for the exposed-pad thermal and electrical requirements of the 64-QFN package. Keep Ethernet differential routing controlled, provide the specified clocking and interface voltage levels, and verify MII or RMII signal timing at the host boundary. The MII and RMII options are not automatically interchangeable; the host SoC, clock architecture, and PCB design must support the selected interface. This product page consolidates the manufacturer’s device identity, package information, interface capabilities, application guidance, cross-reference findings, and engineering-oriented comparison data. It also identifies where a strict, board-compatible drop-in substitute is not established, helping engineers make sourcing decisions without confusing a related ordering suffix with a functionally different switch.

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KSZ8864RMN

KSZ8864RMN - 4-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip Technology KSZ8864RMN is a highly integrated, Layer 2 managed four-port 10/100 Mbps Ethernet switch with two MAC interfaces, supplied in a 64-QFN 8 mm by 8 mm package. The device combines four Fast Ethernet PHYs, media access control units, a non-blocking switch fabric, address lookup engine, and an on-chip frame buffer into one compact network interface solution. An Ethernet switch is a semiconductor that connects multiple physical network ports and forwards Ethernet frames between them. The KSZ8864RMN belongs to the interface-controller hierarchy: Ethernet switch, Layer 2 network controller, network interface IC, and integrated circuit. Its managed architecture supports cost-sensitive industrial, automotive, communications, and embedded Ethernet systems while reducing the number of external discrete components required for four-port copper networking. The principal features include four 10/100 Mbps copper ports, two MII or RMII MAC interfaces, a high-speed non-blocking switch fabric, and on-chip frame buffering. According to the manufacturer datasheet, the switch fabric has 1.4 Gbps memory bandwidth. The device also uses enhanced mixed-signal technology in its PHYs and integrates on-chip termination, helping reduce external circuit requirements. A dedicated address lookup engine handles frame-forwarding decisions within the integrated Layer 2 switch. The KSZ8864RMN combines PHY, MAC, switching, and memory functions in one 64-QFN package. This integration can shorten the design path for embedded equipment requiring four copper Ethernet ports, while the dual MAC interfaces allow the switch to operate alongside a host processor or another network controller. Because it is a managed Layer 2 switch, designers should configure forwarding, filtering, and related behavior through the supported management interface rather than treating it as an unmanaged bridge. Typical applications include industrial Ethernet controllers, automotive infotainment or networking modules, factory equipment, building automation, communications equipment, and embedded gateways. The four-port configuration is particularly useful where a single host must connect to multiple 10/100 Mbps devices. For systems using newer infrastructure, the 10/100 Mbps capability remains relevant for legacy copper links but does not provide gigabit Ethernet throughput. Designers should preserve the exact Microchip reference layout, verify thermal performance across the required ambient range, and confirm management firmware and host-interface timing before release. The 8 mm by 8 mm exposed-pad package requires adequate PCB copper and reflow control. Although the KSZ8864 family has documented functional drop-in replacements, engineers must verify device-specific ordering codes, temperature grades, and firmware behavior before substitution. This product summary combines manufacturer documentation, distributor listings, package information, and verified family cross-reference data. It also identifies same-package drop-in candidates and highlights the practical verification points that are not apparent from a distributor headline alone.

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KSZ8864RMNI

KSZ8864RMNI - 4-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip Technology KSZ8864RMNI is a highly integrated, Layer 2 managed 4-port Ethernet switch with four 10/100 Fast Ethernet PHYs, two MAC interfaces, I2C and SPI control, and an 8 x 8 mm 64-QFN package. It is designed for cost-sensitive industrial networking products that require four 10/100 Mbps copper Ethernet ports in a compact surface-mount footprint. An Ethernet switch is a Layer 2 network device that receives Ethernet frames on one port, examines the destination MAC address, and forwards traffic to the appropriate port or switch fabric. A managed switch adds programmable features such as port configuration, address learning, VLAN support, traffic prioritization, and link status monitoring. The KSZ8864RMNI combines those functions with integrated PHYs and host interfaces, reducing the number of external components required in industrial Ethernet equipment. The KSZ8864RMN family provides patented and enhanced mixed-signal technology, media access control units, a high-speed non-blocking switch fabric, a dedicated address lookup engine, and on-chip frame-buffer memory. The two MAC interfaces can use MII or RMII, while the integrated I2C and SPI interfaces support host configuration and control. These features make the device suitable for industrial controllers, embedded network bridges, factory automation equipment, and compact Ethernet gateways. The KSZ8864RMNI is the industrial-temperature version of the KSZ8864RMN family, specified for operation from -40 C to +85 C. A separate automotive-qualified AEC-Q100 version is identified as KSZ8864RMNU in the manufacturer documentation. The KSZ8864 family is intended for 10/100 Mbps networks and emphasizes a small package size, integrated PHYs, and flexible CPU control interfaces. For a new design, use the manufacturer datasheet for the complete pin description, register map, electrical limits, crystal requirements, and reference schematic. Preserve the recommended Ethernet magnetics, clock, decoupling, and controlled-impedance layout. When replacing an existing device, verify package dimensions, exposed-pad treatment, strap resistors, PHY addressing, and the required MII/RMII clock configuration before confirming a drop-in replacement. This page combines the manufacturer's product information with practical design guidance, drop-in candidate analysis, application context, and a parameter comparison. The comparison is intended to accelerate engineering review while preserving the need to validate timing, thermal behavior, regulatory requirements, and production details against the latest manufacturer documentation.

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KSZ8864RMNU

KSZ8864RMNU - 4-Port 10/100 Ethernet Switch | Microchip

The Microchip Technology KSZ8864RMNU is an automotive-qualified, highly integrated Layer 2 managed Ethernet switch with four 10/100 Mbps ports, MII and RMII host interfaces, and a 64-pin QFN package measuring 8 x 8 mm. The device supports an aggregate switching throughput of 1400 Mbps and is designed for compact, cost-sensitive Ethernet equipment. An Ethernet switch is a networking semiconductor that connects multiple Ethernet nodes through one physical device and forwards frames according to Layer 2 MAC addresses. The KSZ8864 belongs to the managed Ethernet switch category, combining four integrated 10/100 Base-T/TX ports with interfaces for a host processor or network controller. This integration reduces board area, external PHY count, and system complexity in embedded networking designs. Key features include four 10/100 Mbps Ethernet ports, a Layer 2 managed-switch architecture, support for MII and RMII interfaces, and AEC-Q100 automotive qualification. Its 1400 Mbps aggregate switching capacity is appropriate for Fast Ethernet equipment carrying standard 10/100 traffic. A 64-pin QFN package with an exposed pad supports compact surface-mount layouts while providing a thermal and ground connection beneath the device. The KSZ8864RMNU is optimized for embedded systems that require several Fast Ethernet ports without the size or cost of a discrete multi-PHY implementation. Two integrated PHYs and two MAC interfaces divide connectivity between external network ports and the processor-facing side of the design. MII compatibility supports a parallel host interface, while RMII reduces host-side pin requirements when paired with a compatible Ethernet controller or processor. Typical applications include automotive infotainment systems, industrial Ethernet controllers, embedded routers, network appliances, IP cameras, and compact communications equipment. The AEC-Q100 qualification is particularly relevant to automotive platforms requiring a managed Ethernet switch with a small footprint and integrated Fast Ethernet ports. Industrial and commercial products can also use the device where MII or RMII host connectivity is preferred. Designers should follow the manufacturer’s KSZ8864CNX/RMNUB Hardware Design Checklist when assigning RJ45 magnetics, line-side termination, supply connections, exposed-pad layout, and clock requirements. Because the target KSZ8864RMNU is listed as obsolete, a replacement should be checked against the pin-compatibility table in the Microchip replacement notice before schematic and PCB changes are approved. This product page combines the verified device identity, package details, lifecycle information, manufacturer documentation, and the manufacturer-supported replacement path with practical networking and layout guidance. It helps engineers identify the obsolete MPN, evaluate the documented functional replacement, and determine whether existing hardware can remain unchanged.

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KSZ8873FLL

KSZ8873FLL - 3-Port 10/100 Ethernet Switch | Microchip

The Microchip Technology KSZ8873FLL is an integrated 3-port 10/100 Mbps managed Ethernet switch with 100BASE-FX support, I2C and SPI control interfaces, and one MII interface in a 64-LQFP 10 x 10 mm package. It is designed for cost-sensitive, low-port-count, power-efficient Ethernet switching systems. An Ethernet switch is a network-semiconductor device that connects multiple Ethernet ports and forwards frames between them. The KSZ8873FLL combines three Fast Ethernet ports, integrated PHYs, switch-management functions, CPU access, and 100BASE-FX capability on one IC. This integration can reduce component count and simplify PCB layouts compared with discrete PHY and switching arrangements. Verified product information identifies two 100BASE-FX ports and an I2C/SPI management interface. The device also provides port-based and tag-based VLAN support, QoS priority handling, one MII interface, and CPU control and data interfaces. Its 3-port architecture suits embedded systems requiring a small number of wired network connections rather than a high-port-count enterprise switch. The KSZ8873FLL is a managed switch rather than a basic unmanaged switch. Management features allow a host processor to configure the switching fabric, addressing, VLAN behavior, and traffic priority through the available control interfaces. The separate MII interface offers a connection to an external network processor or controller when the system architecture requires centralized traffic handling. Typical uses include industrial Ethernet equipment, embedded control systems, factory automation, telecom access hardware, and compact network-interface modules. The 100BASE-FX capability is particularly relevant where copper Ethernet reach is insufficient and optical-fiber links are preferred. Implementations should still validate magnetic-component isolation, fiber transceiver selection, thermal margin, and the complete switch-management configuration in the target system. The primary engineering consideration is that KSZ8873FLL is a pin-compatible device within the KSZ8873 family but not a universal Ethernet-switch replacement. Board designers must verify the exact package, supported PHY/fiber configuration, management firmware expectations, operating-temperature grade, and supported supply rails before substitution. This page combines verified manufacturer and distributor information, same-family drop-in options, and practical selection guidance.

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KSZ8873FLLI

KSZ8873FLLI - 3-Port 10/100 Managed Ethernet Switch | Microchip Technology

The Microchip Technology KSZ8873FLLI is an integrated 3-port 10/100 Mbps managed Ethernet switch with integrated PHYs, including 100 Base-FX support, I2C, and SPI interfaces in a 64-LQFP package measuring 10 x 10 mm. It supports supply voltages of 1.8 V, 2.5 V, and 3.3 V, with an operating supply range of 2.375 V to 3.465 V. A managed Ethernet switch is a network-semiconductor device that combines multiple physical-layer interfaces, frame handling, and local configuration control into one integrated circuit. The KSZ8873 family is designed for compact, low-port-count, cost-sensitive, and power-efficient 10/100 Mbps switch systems. Its three-port architecture can support copper Ethernet connections alongside a fiber-oriented 100 Base-FX interface when the required external magnetics and line-side implementation are included. Key device characteristics include three integrated 10/100 network ports, 100 Base-FX PHY capability, MII interfacing, and configuration access through I2C or SPI. The KSZ8873FLLI operates across a -40 °C to +85 °C temperature range, making it suitable for industrial equipment, communications equipment, embedded systems, and controlled networking products. The 64-LQFP package provides a standardized surface-mount footprint for industrial and embedded PCB designs. The device is designed to reduce the component count required for a small managed Ethernet switch. Integrated PHYs simplify the connection between the switch core and external magnetics, while I2C and SPI provide alternative management paths for system-level configuration. The MII interface can be used with an external network processor or controller when the system architecture requires frame handling outside the switch IC. Typical applications include industrial Ethernet gateways, serial-to-Ethernet equipment, embedded network controllers, communications equipment, and compact Ethernet switches. Designers should confirm the required port mix, fiber or copper media support, external magnetics, management interface, and supply sequencing before finalizing the PCB layout. Use the manufacturer pin-description table and application schematics when assigning tracks and selecting bypass components. This page organizes the KSZ8873FLLI's verified electrical, package, interface, environmental, and management information, alongside practical design guidance and related KSZ8873 family choices. The comparison focuses on functional differences among the documented 64-LQFP family members rather than assuming that every similarly named Ethernet switch is interchangeable.

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KSZ8873MLL

KSZ8873MLL - 3-Port 10/100 Ethernet Switch | Microchip

The Microchip KSZ8873MLL is a highly integrated three-port 10/100 Mbps managed Ethernet switch with integrated PHYs, a 1.8 V to 3.3 V supply range, an MII host interface, and a 64-LQFP package measuring 10 mm by 10 mm. It is designed for compact, power-efficient, low-port-count Ethernet systems. An Ethernet switch is a semiconductor device that connects multiple physical-layer network ports and manages frame forwarding between them. The KSZ8873 belongs to the Ethernet switch controller hierarchy: three-port managed switch, Ethernet interface IC, network interface, and semiconductor. Compared with discrete Ethernet implementations, its integrated PHYs reduce board area while supporting standardized 10 Mbps and 100 Mbps data rates. The verified manufacturer information identifies three Ethernet ports, 10/100 Mbps operation, low power consumption, and an MII interface. Available specifications also identify 1.8 V, 2.5 V, and 3.3 V supply operation and a 0°C to +70°C temperature range for KSZ8873MLL. These characteristics make the device relevant to embedded network equipment, industrial controllers, embedded Linux systems, and compact Ethernet access products. Technically, the KSZ8873 combines three integrated 10/100 network interfaces with switch-management logic. Its 1.8 V to 3.3 V operating range accommodates systems using 1.8 V, 2.5 V, or 3.3 V power rails, while the MII interface provides a standardized connection to a host controller or processor. The manufacturer describes the family as a cost-sensitive, low-port-count solution for power-efficient 10/100 Mbps switch systems. Typical applications include embedded Linux gateways, industrial Ethernet controllers, printer and copier network interfaces, embedded industrial equipment, and compact network appliances. In each case, the three integrated ports permit local connectivity without requiring three separate external Ethernet PHYs. The MII interface is particularly useful where the system processor already provides Ethernet MAC functionality. Designers should verify the exact MII signal mapping, clock requirements, crystal options, reference circuit, and thermal conditions against the complete Microchip datasheet before layout release. Because the switch includes magnetic-interface PHY circuitry, its layout guidance for magnetics, termination, power decoupling, and high-speed signal integrity should be followed closely rather than treating the package as a generic low-speed controller. This page consolidates the verified manufacturer, distributor, and substitution information for KSZ8873MLL, including pricing context, same-family drop-in candidates, comparison parameters, and practical design considerations. The alternatives and notes provide engineering context beyond a basic distributor specification table, while unresolved electrical details are explicitly identified instead of being estimated.

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KSZ8873MLLI

KSZ8873MLLI - 3-Port 10/100 Ethernet Switch | Microchip

Microchip KSZ8873MLLI is a highly integrated 3-port managed Ethernet switch with integrated 10/100 PHYs, an MII interface, and I2C and SPI management interfaces in a 64-pin PQFP package measuring 10 x 10 mm. It is designed for cost-sensitive, power-efficient, low-port-count Ethernet systems operating at 10/100 Mbps. A managed Ethernet switch is a network interface IC that combines multiple physical-layer transceivers, frame handling, port management, and configuration logic on one semiconductor. Within the broader hierarchy, the KSZ8873MLLI is an Ethernet switch, managed switch, network interface IC, and integrated circuit. This integration reduces the component count required for a small three-port Ethernet node while allowing software-controlled configuration and status monitoring. The device provides three 10/100 Ethernet ports with integrated PHYs. According to the Microchip KSZ8873 product page, the KSZ8873MML, MLL, FLL, and RLL versions target low-port-count, cost-sensitive, and power-efficient 10/100 Mbps switch systems. The MLL variant used by KSZ8873MLLI supports an MII connection and can be managed through I2C or SPI, making it suitable for embedded control systems that need configurable Ethernet ports without a separate switch controller. The 64-PQFP package provides 64 electrical positions for the three integrated PHYs, management interfaces, clocks, power rails, resets, indicators, and auxiliary I/O. Because the package exposes a substantial number of mixed-signal and digital functions, careful partitioning of analog supply, digital supply, and ground connections is important for stable operation. Decoupling should be placed directly beside the relevant supply pins, while high-speed Ethernet traces require controlled impedance and minimized crosstalk. Typical applications include industrial Ethernet gateways, embedded control systems, factory-automation equipment, IoT controllers, networked sensors, industrial HMI panels, and compact embedded platforms that require three Fast Ethernet ports. The integrated PHY architecture is especially useful where board area and external component count are more important than multi-gigabit performance. Designers should verify the exact MLL pinout, internal bonding configuration, supply sequencing, and supported operating mode before committing a PCB layout. Microchip states that the KSZ8873 RLL, MLL, and FLL versions are not interchangeable because their internal bonding differs, and the operating mode cannot be changed through an external pin or register setting. Firmware must therefore configure the device strictly as an MLL part. This page consolidates the manufacturer product description, interface and package details, sourcing information, substitution constraints, and practical integration guidance. It also distinguishes the MLL implementation from related KSZ8873 versions so engineers can avoid an electrically similar but mechanically and functionally unsuitable substitution.

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KSZ8873MLLV

KSZ8873MLLV - 3-Port 10/100 Ethernet Switch | Microchip

The Microchip Technology KSZ8873MLLV is a highly integrated three-port 10/100 Ethernet switch with IEEE 802.3 support, configured through I2C, MII, SPI, or an RMII host interface. It is supplied in a lead-free 64-LQFP package measuring 10 mm by 10 mm. The device also incorporates 10/100 Base-T/TX PHY functions for cost-sensitive, power-efficient, low-port-count network equipment. An Ethernet switch is a semiconductor that connects multiple internal network nodes through frame-based switching instead of requiring a separate software bridge in the host controller. Within the network-interface hierarchy, the KSZ8873 combines a three-port managed switch with integrated Fast Ethernet PHYs. This integration reduces external PHY count, board area, and the number of high-speed signal links crossing a system boundary while retaining dedicated switching resources for multiple Ethernet ports. The KSZ8873MLLV supports 10 Mbps and 100 Mbps operation and includes I2C, MII, SPI, and RMII connectivity. According to the Microchip KSZ8873 product page, the KSZ8873 family is intended for compact, low-port-count systems with an emphasis on low power consumption. Configuration access supports switch monitoring, QoS and CoS packet prioritization, and comprehensive configuration-register access. The device operates from a 1.66 V to 1.94 V core range and a 2.5 V to 3.465 V interface range. A listed supply current of 115 mA makes board-level power budgeting important when the switch is placed beside an application processor, motor-control subsystem, or industrial network controller. The industrial temperature range extends from -40°C to +85°C, supporting industrial and automotive-adjacent deployments where consumer-grade components would be unsuitable. Typical implementations include industrial Ethernet gateways, embedded control panels, network-connected test equipment, automotive body and infotainment Ethernet nodes, and compact PLC communication modules. The RMII option is particularly useful when a host processor requires a parallel Ethernet management path rather than a full MII interface. Layout should preserve the separation of analog PHY circuits, digital switch logic, and crystal-clock or reference-clock distribution. Decoupling must follow the manufacturer’s recommended values, and unused interface pins should be terminated according to the datasheet rather than left to arbitrary bias states. Confirm the exact pin mapping, register defaults, clock requirements, and magnetics recommendations against the current Microchip datasheet before layout release.

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KSZ8873MML

KSZ8873MML - 3-Port 10/100 Ethernet Switch | Microchip

The Microchip KSZ8873MML is a highly integrated 3-port 10/100 Mbps managed Ethernet switch with integrated PHYs, two MII interfaces, and SPI/I2C management in a 64-pin LQFP package measuring 10 x 10 mm. The device targets compact, low-port-count networks requiring integrated switching, advanced power management, and QoS support. An Ethernet switch IC is a semiconductor that connects multiple network nodes, forwards Ethernet frames according to learned MAC addresses, and provides a shared physical network interface. In the product hierarchy, the KSZ8873MML is a managed Ethernet switch with PHY, which belongs to the broader Ethernet interface IC and network-interface semiconductor categories. The verified product information identifies three 10/100 Mbps switch ports, integrated Ethernet PHYs, and configuration through I2C or SPI. Two MII interfaces allow the switching fabric to connect with an external network processor or FPGA. Low power consumption and advanced power management suit cost-sensitive embedded systems, while sophisticated QoS features include IPv6 priority classification. The KSZ8873 family is designed for low-port-count 10/100 Mbps systems where a separate switching chip and multiple physical-layer devices would increase board area, component count, and power consumption. Its 64-LQFP package integrates the network-facing functions, but the two MII paths provide additional integration flexibility for designs requiring host connectivity. Typical applications include industrial Ethernet gateways, embedded network controllers, factory equipment, security systems, and compact communication appliances. A design can connect two copper Ethernet PHYs through the switch while using an MII connection to a host processor. The integrated PHYs reduce external component requirements, and the managed interface allows firmware to configure ports and traffic behavior. Designers should verify the complete MML pinout, clock requirements, magnetics implementation, and power-supply sequencing against the manufacturer datasheet before layout. The MML bonding configuration is specifically not interchangeable with the RLL or FLL variants, so PCB substitution without a manufacturer-supported pinout comparison is not safe. This product record combines verified manufacturer and distributor information with structured application guidance, engineering caveats, and compatibility analysis. It highlights the practical distinction between functional alternatives and true pin-compatible drop-in replacements rather than treating similarly named KSZ8873 variants as interchangeable.

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KSZ8873MMLI

KSZ8873MMLI - 3-Port 10/100 Ethernet Switch | Microchip

The Microchip Technology KSZ8873MMLI is a highly integrated three-port Ethernet switch with integrated 10/100 Mb/s PHYs, managed-switch features, and two MII interfaces in a 64-pin LQFP package measuring 10 mm by 10 mm. It is designed for compact, cost-sensitive, power-efficient 10/100 Mb/s switching systems and supports cable diagnostics, programmable LED indication, low-power operation, MII, and RMII. 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.

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KSZ8873RLL

KSZ8873RLL - 3-Port 10/100 Managed Switch | Microchip

The Microchip Technology KSZ8873RLL is an integrated three-port 10/100 Mbps managed Ethernet switch with integrated PHYs, I2C and SPI interfaces, MII and RMII connectivity, and a 64-pin LQFP package measuring 10 mm by 10 mm. It is designed for compact, power-efficient, low-port-count networking systems operating from 2.5 V and 3.3 V supplies. An Ethernet switch is a network-interface semiconductor that connects multiple physical-layer ports and forwards Ethernet frames according to destination addresses. The KSZ8873RLL belongs to the managed-switch hierarchy: Ethernet switch, network interface controller, interface IC, and semiconductor. Its integrated PHYs reduce board space and external component count in cost-sensitive equipment that does not require a high-port-count switching fabric. Key features include three integrated 10/100 Mbps ports, support for 10/100BASE-T/TX applications, and configuration through I2C or SPI. The available source data identifies both MII and RMII interfaces, allowing the device to serve systems using a parallel media-independent interface or the more compact reduced MII. Its stated operating-temperature range is 0°C to +70°C, which targets commercial equipment rather than extended industrial or automotive environments. The KSZ8873RLL combines three Ethernet ports in one small-footprint IC, reducing the need for separate PHY components and board routing. A 100 Mbps data rate suits legacy Fast Ethernet infrastructure, embedded control networks, industrial equipment, and cost-sensitive network interfaces where full Gigabit Ethernet throughput is unnecessary. Manufacturer information describes the device as a power-efficient 10/100 Mbps switch system solution. Typical uses include compact Ethernet switches, embedded network bridges, industrial control equipment, set-top and consumer networking products, and systems requiring one Fast Ethernet uplink plus internal switched ports. Its I2C and SPI configuration paths can support host processors that need programmable switch behavior without dedicating many host GPIO pins. Designers should verify the exact MII or RMII configuration, reference-clock arrangement, magnetics interface, and exposed-pad connection against the manufacturer datasheet before layout. Place the 164-ohm clock-termination resistors near the device when the reference-design guidance calls for them, and change the suggested value to 33 ohms when PHY MII mode is selected. This page consolidates the verified manufacturer and distributor details, documents supported family substitutions, compares package and functional characteristics, and adds implementation guidance that is not presented as a single combined summary in the original search results.

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KSZ8873RLLI

KSZ8873RLLI - 3-Port 10/100 Ethernet Switch | Microchip

The Microchip Technology KSZ8873RLLI is a highly integrated three-port managed Ethernet switch with integrated 10/100 Base-T/TX PHYs, supporting data rates up to 100 Mbps and operating from 1.8 V, 2.5 V, or 3.3 V supplies. The device combines an Ethernet switch, three physical-layer interfaces, and host-control connectivity in a compact LQFP-48 package. Its interface options include I2C, SPI, and RMII, allowing it to suit embedded network equipment, industrial controllers, and cost-sensitive Ethernet systems. An integrated managed Ethernet switch connects multiple physical-layer ports through one switching engine, reducing the need for discrete PHYs, magnetics interfaces, and separate switch controllers. The KSZ8873 series is positioned for low-port-count, power-efficient 10/100 Mbps networks where three integrated PHYs provide a compact bridge between copper Ethernet interfaces and a host processor or embedded control system. Key features include three integrated 10/100 Ethernet ports, operation at up to 100 Mbps, a typical 115 mA supply current, and support for 1.8 V, 2.5 V, or 3.3 V supply levels. The combination of I2C and SPI host interfaces supports configuration access from embedded processors, while the RMII interface provides a dedicated connection to a network controller. The LQFP-48 package supports conventional surface-mount assembly and thermal copper-area integration. The device uses a mixed 1.8 V, 2.5 V, and 3.3 V supply architecture, allowing system designers to align core and interface voltage domains. A 115 mA typical operating current is particularly useful for compact embedded platforms where the Ethernet function must coexist with power-limited processors and sensors. The three integrated PHYs also reduce board area by consolidating three copper-network interface sections into one switching IC. Typical applications include industrial Ethernet gateways, embedded control systems, set-top and network appliances, instrumentation platforms, and low-cost Ethernet bridges. The switch is especially useful when a board needs several 10/100 ports but a higher-speed multi-gigabit switching architecture would add unnecessary cost, power, and complexity. Designers should account for the specified operating temperature of -40°C to +85°C and verify every power rail against the manufacturer's recommended sequencing and decoupling requirements. Ethernet magnetics, center-tap capacitors, impedance-controlled differential pairs, and connector layout remain essential even when the PHY and switch functions are integrated into one package. This product overview combines port, interface, voltage, packaging, and lifecycle information with application guidance and engineering selection notes. It also identifies the strength and limitations of available drop-in alternatives, helping engineers validate footprint compatibility, operating conditions, and host-interface requirements before making a PCB or sourcing decision.

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KSZ8893FQL

KSZ8893FQL - 3-Port 10/100 Ethernet Switch | Microchip

The Microchip Technology KSZ8893FQL is a highly integrated single-chip three-port Fast Ethernet switch with fiber support, three MAC units, a non-blocking switch fabric, and integrated 10/100 transceivers. It supports copper and fiber media conversion, with 10/100 Base-T/TX and 10/100 Base-FL/SX connectivity, and is packaged in a 128-pin PQFP measuring 14 mm by 20 mm. An Ethernet switch is a Layer 2 network-semiconductor device that receives Ethernet frames on one port, processes them through a switching fabric, and forwards them to another port. The KSZ8893FQL belongs to the managed Ethernet switch hierarchy, combining media access control, physical-layer transceivers, and switching functions for industrial, communications, and embedded network equipment. Key features include support for two 10/100 copper transceivers, fiber connectivity, three MAC units, a non-blocking switch fabric, and a Layer 2 managed-switch architecture. The KSZ8893FQL supports IEEE 802.3u auto-negotiation, allowing link partners to select a common operating mode. Its single-ended fiber-module connections are identified as TXM1 on pin 49 and RXM1 on pin 46. Technically, the device combines mixed-signal low-power Ethernet transceivers with frame-buffer and switching resources. The supplied manufacturer documentation describes TS-1000 Operations, Administration and Maintenance support, while the product listing identifies both I2C and SPI management interfaces. These capabilities position it for low-port-count systems requiring copper-to-fiber media conversion or managed Layer 2 connectivity. Typical uses include industrial Ethernet bridges, serial-to-Ethernet equipment, embedded control networks, factory automation gateways, and compact optical media converters. In a copper-to-fiber link, the switch can bridge a 10/100 Base-T network segment to a 100BASE-FL or 100BASE-SX module without requiring a separate external Ethernet switch. Designers must account for the large 128-pin PQFP footprint, provide suitable fiber-interface circuitry for the selected optical module, and validate management firmware against the supported register set. Availability, operating-temperature grades, EMC performance, and some electrical limits should be confirmed from the manufacturer datasheet before production release. This product page combines verified manufacturer and distributor information with application guidance, comparison data, and design considerations that help engineers evaluate the KSZ8893FQL for managed Fast Ethernet and fiber-conversion designs.

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KSZ8893MBL

KSZ8893MBL - 3-Port 10/100 Managed Switch | Microchip

The Microchip Technology KSZ8893MBL is a 3-port 10/100 Mbps managed Layer 2 Ethernet switch with integrated PHYs, available in a 100-pin LFBGA package and configured through I2C or SPI interfaces. It supports 10/100 Base-FX, Base-T, and Base-TX connectivity, providing a compact solution for low-port-count, cost-sensitive Ethernet systems. An Ethernet switch is a networking semiconductor that receives Ethernet frames on one port and forwards them to the appropriate destination port. The KSZ8893 belongs to the managed-switch hierarchy, where Layer 2 switching is combined with traffic-management functions rather than basic frame replication. Its management capabilities include rate limiting, tag- and port-based VLAN support, QoS priority, MIB counters, and CPU control and data interfaces. The KSZ8893MQL and KSZ8893MBL versions integrate three 10/100 Ethernet PHYs with a managed switching engine. Supporting RMII, MII, and SNI interfaces allows connection to a host processor or network controller. I2C and SPI host interfaces provide access to configuration and status registers, while frame buffers support the managed-switch architecture. These functions make the device suitable for compact industrial, embedded, and communications equipment requiring three Ethernet ports without a discrete switch ASIC. The KSZ8893MBL is particularly useful where port count is intentionally low and board area is constrained. Its 100-LFBGA package supports dense multilayer layouts, but it requires careful escape-routing and high-speed layout techniques. Differential Ethernet pairs should be routed as controlled-impedance transmission lines, with magnetics or appropriate PHY-side network interfaces implemented according to the system reference design. Typical uses include industrial controllers, embedded logging equipment, computing modules, factory automation nodes, serial-to-Ethernet systems, and compact network access products. In these applications, the integrated PHYs reduce the number of external Ethernet magnetics and interface components while managed features allow traffic prioritization and controlled access to shared uplink bandwidth. The primary design consideration is that the MBL ordering code and its 100-pin LFBGA land pattern must be matched exactly during PCB and assembly planning. Power, ground, RMII or MII signals, management buses, and all three Ethernet channels require careful partitioning. Compliance and exact operating limits should be confirmed against the manufacturer datasheet before production release. This page consolidates the verified distributor information, manufacturer documentation, package constraints, pricing indicator, and available cross-reference evidence. It also distinguishes the KSZ8893MBL from related ordering codes and clearly identifies engineering data that still requires confirmation from the full manufacturer datasheet.

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KSZ8893MBLI

KSZ8893MBLI - 3-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip Technology KSZ8893MBLI is a highly integrated, three-port Layer 2 managed Ethernet switch for 10/100 Mbps systems, with I2C and SPI control interfaces in a 100-pin LFBGA package. It supports RMII, MII, and SNI interfaces for connection to a host processor, while each switched port supports 10/100 Base-TX and Base-FX connectivity. An Ethernet switch is a semiconductor that connects multiple network endpoints through a dedicated frame-forwarding datapath. The managed-switch category extends basic Layer 2 forwarding with configuration, traffic-control, and status features. Within the hierarchy, KSZ8893MBLI is an Ethernet switch, then a managed Layer 2 switch, then a network interface IC and an integrated circuit for communications equipment. The KSZ8893MBLI integrates rate limiting, tagged and port-based VLAN support, QoS priority, port management, and Management Information Base counters. These functions allow a host processor to configure traffic handling and monitor switch activity through a serial management interface. The I2C and SPI interfaces provide alternatives for embedded system integration, while RMII, MII, and SNI connectivity support different processor and PHY arrangements. The KSZ8893 family is positioned for cost-sensitive, low-port-count 10/100 Mbps networks. A three-port configuration can support multiple wired endpoints without requiring a larger switch, while Layer 2 management features help implement controlled industrial, communications, and embedded Ethernet equipment. The SNI interface is particularly relevant to designs where an integrated network interface on the host supplies physical-layer connectivity. The KSZ8893MBLI is offered in a compact 100-pin LFBGA package, supporting space-constrained industrial and embedded designs. Layout requires careful high-speed trace routing, solid supply distribution, and effective decoupling. Use the manufacturer’s pin-description table and reference design guidance when assigning signals and placing bypass capacitors, especially for RMII, MII, and SNI implementations. This page combines the manufacturer’s device positioning with practical application guidance, interface-selection context, and verified lifecycle information. It also identifies where design engineers should consult the official datasheet for the complete pin list, electrical limits, register map, layout guidance, and device-specific recommendations before releasing a PCB.

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