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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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
KSZ8893MQL - 3-Port 10/100 Managed Ethernet Switch | Microchip
The Microchip KSZ8893MQL is a highly integrated three-port 10/100 Mbps layer 2 managed Ethernet switch with integrated transceivers, MAC units, a non-blocking switch fabric, address lookup, and frame-buffer memory. It supports two 10/100 transceivers, with one PHY also supporting 100BASE-FX fiber connectivity, and is housed in a 128-pin PQFP package measuring 14 x 20 mm. The device is intended for low-port-count, cost-sensitive 10/100 Mbps switch systems. A managed Ethernet switch is a Layer 2 network device that forwards Ethernet frames between multiple ports while adding features such as VLAN tagging, port-based and tag-based prioritization, rate limiting, QoS, management access, and auto-negotiation. The KSZ8893MQL combines those switch-management functions with PHY transceivers, reducing the component count and board area required for embedded network equipment. The KSZ8893MQL supports 10BASE-T and 100BASE-TX copper links, while one integrated PHY supports 100BASE-FX. According to the Microchip product page and manufacturer datasheet, the device provides an extensive feature set for cost-sensitive switching systems, including rate limiting, tag/port-based VLAN support, QoS priority, and management capabilities. Its interface supports I2C and SPI control, as identified by distributor listings. The switch fabric is non-blocking and includes a dedicated address-lookup engine and on-chip frame-buffer memory. These resources support simultaneous frame handling across the integrated ports while reducing the processing burden on an external host processor. The device can therefore serve as the central Ethernet switching element in industrial control, embedded instrumentation, communications equipment, and compact network-edge systems. The KSZ8893MQL operates from a 3.3 V supply and supports non-volatile configuration storage and an enable or shutdown function, according to the verified distributor data. It also conforms to the IEEE 802.3u auto-negotiation protocol, allowing link partners to select the best common operating mode. The 128-PQFP package is surface mount and lead-free. Designers should preserve the required separation between copper Ethernet magnetics, fiber circuitry, power distribution, and the digital management interface. The manufacturer datasheet should be used for exact pin assignments, electrical limits, timing, register definitions, and layout guidance. The KSZ8893MQL is most appropriate when a design needs a small, managed three-port 10/100 Ethernet switch with integrated copper and optional fiber interfaces rather than a higher-port-count or higher-speed switch. This page combines the verified manufacturer, distributor, and cross-reference information with package-focused selection guidance, commercial data, and practical differentiation between documented same-family configurations.
KSZ8895FMQ - 5-Port 10/100 Managed Ethernet Switch | Microchip
Microchip Technology KSZ8895FMQ is a highly integrated, automotive-qualified, Layer 2 managed five-port Ethernet switch with 10/100BASE-T/TX physical interfaces and MII/RMII host connectivity, housed in a 128-pin PQFP package measuring 14 x 20 mm. It combines five 10/100-Mbps Ethernet ports, switching, physical-layer transceivers, traffic management, and power-management functions in one device. An Ethernet switch is a semiconductor that connects multiple physical-layer network ports and forwards Ethernet frames between them. The KSZ8895 belongs to the Layer 2 Ethernet-switch category, with managed traffic-control capabilities positioned above basic unmanaged Ethernet switching. Its integrated 10/100BASE-T/TX transceivers reduce the need for separate PHY components, while MII and RMII interfaces connect the switch to a host processor or embedded controller. Key features include five integrated 10/100-Mbps Ethernet ports, Layer 2 management, automotive qualification, low-power operation, advanced power management, flexible configuration, and quality-of-service support. The manufacturer datasheet also describes tagged-port processing, programmable rate limiting, priority-ratio support, four-queue prioritization, Rapid Spanning Tree Protocol support, packet filtering, and on-chip termination. These functions support cost-conscious network equipment while reducing external component count and board area. The KSZ8895 family integrates Micrel physical transceiver and switch technology into a single IC. Multiple packet filters, QoS queues, and spanning-tree features allow system designers to shape traffic behavior without implementing those policies in the host processor. The MII interface supports conventional parallel network-controller connectivity, while RMII reduces the number of host interface signals in designs where it is suitable. Typical uses include automotive Ethernet gateways, industrial Ethernet controllers, embedded network appliances, print servers, IP cameras, set-top equipment, and industrial control systems. The five-port arrangement supports connecting several 10/100-Mbps devices through one switched network segment, while the managed features are useful where deterministic prioritization or packet filtering is more important than a simple hub or basic switch. Designers should pay particular attention to PHY layout, 10/100BASE-TX magnetics and termination, RMII timing, MII signal integrity, decoupled supply rails, and the manufacturer’s recommended magnetic-component network. Microchip’s KSZ8895 documentation and migration application notes should be reviewed before changing between KSZ8895 ordering codes because functional replacement does not eliminate checks for package, temperature grade, firmware, register, and system-software requirements. This page consolidates verified distributor listings, manufacturer information, the KSZ8895 migration reference, package details, and practical selection guidance. It also distinguishes confirmed drop-in family replacements from unsupported assumptions, helping engineers identify the information that still requires datasheet and PCB-level verification before procurement.
KSZ8895MQ - 5-Port 10/100 Managed Ethernet Switch | Microchip
The Microchip Technology KSZ8895MQ is an integrated five-port 10/100BASE-T/TX Layer 2 managed Ethernet switch with MII, RMII, or SNI connectivity and I2C/SPI configuration support. It operates from a 3.15 V to 3.45 V supply, supports data rates up to 100 Mbps, and is packaged in a 128-pin PQFP measuring 14 mm by 20 mm. An Ethernet switch is a network-semiconductor device that receives frames on one port and forwards them to selected destination ports. The five-port KSZ8895MQ integrates five 10/100 Ethernet ports, Layer 2 switching, port management, and advanced power-management functions. Within the broader networking hierarchy, it belongs to Ethernet controllers, interface ICs, network semiconductors, and integrated circuits. The KSZ8895MQ supports five integrated 10/100 ports and one MII interface according to the verified distributor description. MII supplies parallel Ethernet data and control signals, while RMII and SNI offer reduced-pin serialization options when supported by the connected host. I2C and SPI interfaces provide configuration and management access. Advanced power management, flexible configuration, and Layer 2 QoS features are identified by the manufacturer documentation. The device is designed for cost-sensitive, power-efficient 10/100 Mbps systems by combining Micrel physical-transceiver and switch technology on one IC. Its 3.3 V-class operating range and integrated five-port architecture reduce the component count required for embedded switching. The automotive-qualified KSZ8895 family also targets network equipment where managed Layer 2 functionality and power control are useful. Typical uses include industrial Ethernet control, automotive networking, embedded gateways, print systems, IP telephones, and other equipment that needs a compact five-port Fast Ethernet switch. Designers should verify the exact protocol mode, strap configuration, clock source, magnetics, termination, and layout requirements in the manufacturer datasheet before layout release. Layered QSFP-style magnetics, exact 50-ohm impedance geometry, and differential-pair routing according to the manufacturer reference design help preserve Ethernet signal quality. Sufficient supply decoupling and thermal copper are equally important because integrated transceivers and switching logic concentrate heat within the 128-pin surface-mount package. This page combines the verified product identity, electrical limits, interfaces, package data, replacement information, and application guidance with practical design notes. It also distinguishes confirmed drop-in replacements from merely similar Ethernet devices, helping engineers compare alternatives without assuming interchangeability.
KSZ8895MQI - 5-Port 10/100 Ethernet Switch | Microchip
The Microchip Technology KSZ8895MQI is a highly integrated, Layer 2 managed, five-port 10/100 Ethernet switch with one MII interface, supplied in a 128-pin PQFP package measuring 14 x 20 mm. It supports 100 Mbps Ethernet operation according to IEEE 802.3 and IEEE 802.3u, and the KSZ8895 family provides fiber support. The part is identified by distributors as an industrial-grade Ethernet interface IC. An Ethernet switch is a Layer 2 network device that connects multiple endpoints through dedicated internal switching paths and forwards Ethernet frames using hardware-assisted address processing. Within the broader product hierarchy, the KSZ8895MQI is an Ethernet interface controller, an interface IC, and a semiconductor designed for embedded networking systems. Its five-port architecture allows a single device to connect multiple 10/100 endpoints while reducing the number of discrete network components required by a product. The main engineering features include five integrated 10/100 Ethernet switch ports, Layer 2 managed-switch operation, an MII interface for connection to a host processor, and support for 100 Mbps data rates. The verified operating-voltage information identifies 1.14 V and 1.26 V supply levels. The 128-PQFP package provides a high pin count for the integrated switching, media, and management interfaces, while its 14 x 20 mm body is substantially larger than the compact packages commonly used for single-port Ethernet PHYs. The KSZ8895 family is designed to reduce total system cost by consolidating multiple Ethernet switching functions into one integrated circuit. Its MII interface permits connection with compatible processor or controller hardware, avoiding the need for a separate physical-layer arrangement solely for switched connectivity. The managed Layer 2 feature set distinguishes the device from basic unmanaged switches and supports integration into embedded equipment requiring controlled Ethernet forwarding behavior. Typical applications include industrial Ethernet controllers, automotive or transportation networking equipment, embedded routers, factory automation gateways, and network interface modules. The five-port arrangement is especially useful where several wired endpoints must share a central switching function while an external processor accesses the switch through MII. These uses align with the part's industrial-grade designation and the KSZ8895 family's system-cost reduction objectives. A key design consideration is package and interface verification. The KSZ8895MQI uses a 128-pin PQFP footprint, so a replacement must match both the physical package and relevant pin functions; functional similarity alone is insufficient. Power, clock, media-interface, and management signals must be checked against the manufacturer documentation before layout release or schematic substitution. This page consolidates verified manufacturer and distributor information, documented migration alternatives, application guidance, comparison parameters, and PCB-focused selection notes. It also distinguishes exact switch characteristics from data requiring verification, helping engineers make a defensible sourcing and design decision without treating electrically similar but non-pin-compatible parts as drop-in replacements.
KSZ8895MQXI - 5-Port 10/100 Managed Ethernet Switch | Microchip
The Microchip Technology KSZ8895MQXI is a highly-integrated, Layer-2 managed, five-port 10/100 Mbps Ethernet switch housed in a 128-pin PQFP (14x20 mm) package. It provides five integrated 10/100Base-TX PHYs with MII/RMII host interface options, I2C and SPI management, and is qualified for automotive and industrial environments. The device is designed to reduce system BOM cost by integrating magnetics-center-tap terminations, on-chip low-dropout regulators, and a 1.4 Gbps non-blocking switch fabric in a single IC. What is a Layer-2 managed Ethernet switch? A Layer-2 managed Ethernet switch is a networking IC that operates at the data-link layer (MAC) of the OSI model, forwarding Ethernet frames between ports based on MAC address tables while supporting management features such as VLAN tagging (IEEE 802.1Q), QoS prioritization (IEEE 802.1p), port mirroring, IGMP snooping, and rate limiting. The KSZ8895 belongs to the Fast-Ethernet switch family within the broader category of Ethernet controllers, which sit above physical-layer transceivers (PHYs) in the networking semiconductor hierarchy. Key features include five 10/100Base-TX ports with auto-negotiation and auto-MDI/MDIX, an integrated 1.4 Gbps switch fabric with 64 KB frame buffer, support for 4K-entry MAC address table, IEEE 802.1Q VLAN with 16 VLAN groups, IEEE 802.1p QoS with four priority queues, and per-port programmable head-of-line blocking prevention. The device operates from a single 3.3 V supply with internal 1.8 V LDO and supports commercial (0C to 70C) and industrial (-40C to 85C) temperature ranges. The KSZ8895MQXI uses a store-and-forward switching architecture with a 32-bit MIPS-style management interface accessible via SPI or I2C. Its integrated PHYs include HP Auto-MDIX crossover detection on all five ports, eliminating external magnetics-center-tap resistors in many designs. The 128-pin PQFP package provides generous PCB escape routing for high-density industrial designs. Typical applications include industrial Ethernet switches, automotive gateway ECUs, IP surveillance NVR/DVR systems, building automation controllers, and IoT edge gateways requiring deterministic Layer-2 switching. The KSZ8895 is commonly used in PROFINET, EtherCAT, and Modbus TCP environments. When designing with this device, note that the 128-pin PQFP requires a 4-layer PCB minimum for proper return-path integrity on the MII/RMII bus. Use a 25 MHz crystal with 50 ppm accuracy for the reference clock and place decoupling capacitors (0.1 uF plus 10 uF bulk) within 3 mm of each supply pin.
KSZ8895MQXIA - 5-Port 10/100 Managed Ethernet Switch | Microchip
The Microchip Technology KSZ8895MQXIA is a highly integrated, Layer 2 managed, five-port Fast Ethernet switch IC delivering 10/100 Mbps Base-T/TX connectivity with integrated PHYs in a 128-pin PQFP (14x20 mm) package. It supports five ports with auto-negotiation, auto MDI/MDIX crossover, and offers both MII and RMII host interfaces plus I2C and SPI management interfaces for flexible host connectivity. What is a managed Ethernet switch IC? A managed Layer 2 switch is an integrated circuit that connects multiple Ethernet nodes and implements MAC (Media Access Controller) bridges with frame forwarding, VLAN tagging, QoS prioritization, and management features. The KSZ8895MQXIA belongs to the managed Ethernet switch taxonomy: Ethernet switch IC -> Layer 2 switch -> managed switch -> 10/100 Mbps Fast Ethernet switch. It sits at the network edge or in industrial nodes, replacing discrete PHY+MAC designs with a single chip that includes all five PHYs, the switch fabric, and a management interface. The KSZ8895MQXIA integrates five 10/100 BASE-TX transceivers with HP Auto-MDIX, a 1.4 Gbps high-performance non-blocking switch fabric, 1 K entry MAC address table, and full Layer 2 management including 802.1Q VLAN, 802.1p QoS priority, port mirroring, and IGMP snooping. The device operates from a 3.3V core supply plus a 1.2V internal LDO output, supports industrial temperature range, and is AEC-Q100 qualified for automotive Ethernet applications per Microchip's product page. Architecturally, the KSZ8895MQXIA uses a store-and-forward shared-memory switch fabric with 256 KB internal packet buffer. Each port supports 10/100 Mbps full/half duplex with flow control (802.3x pause frames) and back-pressure in half-duplex mode. Host management is provided through SPI, I2C, or MII/RMII in unmanaged mode. Typical applications include industrial Ethernet daisy-chain nodes, automotive in-vehicle networking (IVN) gateways, IP surveillance and security switch modules, building automation controllers, and embedded industrial control boards requiring a small-footprint multi-port Ethernet switch. When designing with the KSZ8895MQXIA, follow Microchip's reference MII/RMII clocking guidelines and use 25 MHz or 50 MHz crystal for the MII reference. Note that Microchip's support article recommends KSZ8895MQXI (revision B) for new designs; the MQXIA suffix denotes revision A3 with known errata. This page synthesizes the manufacturer datasheet, Microchip's drop-in migration app note, and distributor pricing to provide a single reference for engineers evaluating the KSZ8895MQXIA for new and existing designs.
KSZ8895RQI - 5-Port 10/100 Managed Ethernet Switch | Microchip
The Microchip KSZ8895RQI is a highly integrated, Layer 2 managed five-port Ethernet switch with 10/100 Base-T/TX PHYs, one RMII interface, and one SW5-RMII interface, housed in a 128-PQFP (14 x 20 mm) package. According to the verified distributor and manufacturer listings, it is an industrial-temperature I-Temp device operating from -40°C to 85°C and supports 1.8 V, 2.5 V, and 3.3 V supply rails. The integrated switch is designed for compact, cost-sensitive embedded networking designs requiring multiple copper Ethernet ports and a compact host-facing interface. An Ethernet switch is a Layer 2 network device that receives Ethernet frames on one port, determines the destination port, and forwards traffic to the appropriate output port while reducing unnecessary collision-domain traffic. The KSZ8895 family integrates five 10/100 PHYs, switching logic, and management features into one device, reducing the need for discrete PHY components and simplifying PCB layout. Its RMII interface connects the switch to an embedded host processor using a reduced pin-count medium-speed interface. The verified listings identify the part as a five-port 10/100 Base-T/TX Ethernet switch with RMII support and multiple supply-voltage options. Its automotive-oriented family positioning is reflected by the Microchip product page, which describes the KSZ8895 family as automotive qualified, while the exact qualification status of this specific orderable MPN should be confirmed against the latest manufacturer documentation. The 128-PQFP package provides a high pin count suitable for dedicated PHY, management, power, and host-interface connections. The KSZ8895RQI is suitable for industrial control equipment, automotive electronics, embedded gateways, network appliances, and compact Ethernet bridges. Its integrated five-port architecture can provide local copper connectivity for controllers, sensors, service interfaces, and upstream links. In an industrial design, the -40°C to 85°C I-Temp rating supports operation across extended commercial temperature environments, provided the system meets the device's electrical and layout requirements. Designers should confirm the exact RMII signal mapping, required external components, strap settings, and supply sequencing from the manufacturer datasheet before layout release. The 128-PQFP footprint demands careful decoupling and controlled routing for each PHY and digital interface. This page combines verified product identity, distributor sourcing, package details, and practical design guidance; detailed electrical limits should be obtained from the official Microchip KSZ8895 documentation. Because the supplied web data does not provide verified numerical pricing or a complete pin-level table, unavailable values are explicitly marked rather than inferred. Engineers should use the latest datasheet and current distributor inventory for production sourcing.
KSZ8995FQI - 5-Port 10/100 Managed Ethernet Switch | Microchip
The Microchip Technology KSZ8995FQI is a 5-port 10/100 Mbps integrated managed Layer-2 Ethernet switch delivered in a 128-pin PQFP (14x20 mm) package. The device integrates five 10/100 transceivers, five MACs, frame buffers, and a non-blocking switch fabric, supporting IEEE 802.3 and IEEE 802.3u compliance. It is targeted at cost-sensitive five-port 10/100 systems with low power consumption, on-chip termination, and Fiber Support via an external 100BASE-FX transceiver interface on port 5. An Ethernet switch IC is a Layer-2 network device that forwards Ethernet frames between connected ports based on MAC addresses, sitting between the PHY (physical layer transceiver) and the higher-layer CPU/MAC processor. In the system hierarchy, the KSZ8995FQI is a switch: switch IC -> Layer-2 Ethernet switch -> managed switch -> Ethernet controller -> networking IC -> semiconductor. It falls under the broader category of specialized networking ICs that combine multiple PHYs, lookup engines, and queue management for industrial, embedded, and consumer Ethernet applications. Key features include an integrated Layer-2 managed switch fabric with per-port 10/100 Mbps support, on-chip termination resistors for reduced BOM, port-5 Fiber Support (100BASE-FX), QoS prioritization with four queues, port-based VLAN and 802.1Q tag-based VLAN, IGMP snooping for multicast, and a comprehensive MII/RMII management interface. According to the manufacturer datasheet, the part supports unmanaged or managed operation via SPI, I2C, or MDC/MDIO host access. The KSZ8995FQI uses Micrel/Microchip's proven 0.18um process with internal voltage regulation for 1.8V/2.5V rails from a single 3.3V supply, reducing external component count. Its non-blocking wire-speed switching architecture delivers full 100 Mbps throughput on all ports simultaneously, with latency suitable for real-time industrial control and IP-surveillance backhaul. Typical applications include industrial Ethernet, IP surveillance, broadband gateways, VoIP phone systems, and embedded industrial control. The on-chip termination and integrated magnetics support make it ideal for compact designs where PCB area and BOM cost are constrained. When designing with this device, ensure that the 3.3V supply is decoupled with 0.1uF and 10uF capacitors close to each power pin. The exposed pad (if any) should be soldered to a sufficient copper pour for thermal dissipation. For Fiber Support on port 5, an external 100BASE-FX transceiver such as a Micrel/Microchip fiber PHY must be connected. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing unique engineering value beyond what DigiKey/Mouser/Octopart product pages typically offer.
KSZ8995MAI - 5-Port 10/100 Managed Ethernet Switch | Microchip
The Microchip Technology KSZ8995MAI is an integrated 5-port 10/100Mbps Layer-2 managed Ethernet switch with on-chip transceivers and frame buffers, housed in a 128-pin PQFP (14x20mm) package. It supports IEEE 802.3 and IEEE 802.3u with 3.15V to 3.45V supply, delivering tag/port-based VLAN, QoS priority, MIB counters, dual MII interfaces, and CPU control/data interfaces for cost-sensitive 5-port Fast Ethernet systems. The device integrates five 10/100 PHYs plus the switching fabric, reducing external BOM cost and board area. What is a managed Layer-2 Ethernet switch? A managed switch is a networking IC that operates at the data link layer (Layer 2) of the OSI model, forwarding Ethernet frames between ports using MAC-address lookup while exposing configuration, monitoring, and traffic-prioritization features to an external CPU. Within the product hierarchy, the KSZ8995MAI is a 5-port managed Fast Ethernet switch, sub-class of Ethernet switch -> Ethernet controller -> networking IC -> communication semiconductor. Key features include five integrated 10/100BASE-TX transceivers with HP/MDI-X auto-crossover, 1.4 Gbps non-blocking switch fabric, tag/port-based VLAN (up to 16 groups), QoS with four priority queues per port, MIB II / RMON statistics counters, dual MII/RMII/SNI interfaces to external PHYs or MAC, and an I2C/SPI/E2PROM management interface. Internal frame buffer is approximately 64 KB shared across ports. The part is targeted at non-blocking wire-speed operation on all five ports simultaneously. Architecturally, the KSZ8995MAI uses a store-and-forward switching engine with a 1K-entry address table and a shared memory packet buffer. Each port has dedicated transmit/receive FIFOs and an integrated PHY with on-chip termination resistors. The 128-pin PQFP body leaves generous copper-pour capability, beneficial for thermal dissipation since total 3.3V power scales with port activity and cable length. Typical applications include industrial Ethernet daisy-chained sensor hubs, IPTV/Settop box LAN aggregation, fiber-to-copper media converters with 100BASE-FX support via external PHY, factory-automation I/O modules, and low-port-count unmanaged/managed enterprise edge switches. The wide QoS and VLAN feature set also makes it suitable for small-office/home-office gateway designs. Design consideration: provision adequate 3.3V decoupling near each analog supply pin, follow Microchip's reference layout for 50-ohm controlled-impedance traces on MDI pairs, and ensure the 25 MHz reference crystal or oscillator meets the +/-50 ppm tolerance for 100BASE-TX compliance. This page synthesizes distributor pricing, same-brand drop-in alternatives (KSZ8995MA, KSZ8995MQX/RQX/FQX, KSZ8895MQ, KSZ8995XA), and practical design notes that go beyond the manufacturer datasheet.
KSZ8999I - 9-Port 10/100 Switch w/ PHY & Frame Buffer | Microchip
The Microchip Technology KSZ8999I is an integrated 9-port 10/100 Ethernet switch containing eight physical layer transceivers, nine MAC units, and an integrated Layer-2 switch fabric with frame buffer memory, delivered in a 208-pin PQFP (28x28 mm) industrial-temperature package. A Layer-2 managed Ethernet switch is a network device that forwards Ethernet frames between ports based on MAC addresses while supporting features such as VLANs, QoS priority handling, and port mirroring. Within the broader power-and-networking hierarchy, an integrated switch IC sits inside the Interface ICs family, alongside Audio Codecs and Video ICs, and is the silicon heart of small-to-medium Ethernet switching platforms where board real-estate and BOM cost are critical. Key features include eight 10/100BASE-TX transceivers, a ninth MAC for an external MII/RMII uplink, full wire-speed non-blocking switching, support for store-and-forward and cut-through switching modes, port-based and 802.1Q VLAN tagging, 802.1p QoS priority queues, per-port ingress/egress rate limiting, and management through an I2C/SPI/MII serial interface. The device includes 256 KB of internal frame buffer and supports IGMP snooping for multicast filtering. Architecturally, the KSZ8999I integrates each PHY's DSP-based echo canceller, baseline wander correction, and adaptive equalization on-chip, eliminating the need for external magnetics-matching components beyond the standard 1:1 transformer. The switch fabric implements a shared-memory architecture with a 256-entry address lookup engine that is shared by all MACs, providing deterministic low-latency forwarding. Internal PHY-MAC links operate at 100 Mbps full-duplex, while external MAC interfaces can be configured as MII, RMII, or SMII. Typical applications include industrial Ethernet switches, factory-floor managed switches, IP surveillance and security NVRs, smart-grid substation routers, industrial IoT gateways, and embedded networking modules for building automation. Its industrial temperature rating (-40C to +85C) makes it suitable for outdoor enclosures and uncontrolled environments. When designing with this part, pay attention to the 208-pin PQFP land pattern and allocate adequate PCB area around the IC for the eight integrated magnetics RJ45 footprints. Power-supply decoupling must include bulk 25V decoupling rails for analog and digital sections separately to avoid PHY lock degradation from digital switching noise coupling into the analog rail.
KSZ9021GNI - Gigabit Ethernet PHY | Microchip Technology
The Microchip Technology KSZ9021GNI is a triple-speed Gigabit Ethernet physical-layer transceiver supporting 10Base-T, 100Base-TX, and 1000Base-T data rates in a 64-pin QFN package measuring 8 mm by 8 mm. It operates from a 3.135 V to 3.465 V supply and provides GMII or MII connectivity to the host digital controller. The part supports data rates up to 1000 Mbps and an operating temperature range of -40 °C to +85 °C. An Ethernet physical-layer transceiver, commonly called an Ethernet PHY, converts digital data into signals suitable for twisted-pair cabling and converts received cable signals back into digital data. In the broader hierarchy, the KSZ9021GNI is an interface IC, a network interface, an Ethernet transceiver, and ultimately a semiconductor used within a wired-networking system. The KSZ9021 supports all three major Ethernet rates used over category-5 unshielded twisted-pair cable. Its GMII interface provides the high-speed parallel connection normally required for 1000 Mbps operation, while MII support allows lower-speed or resource-constrained systems to use the same PHY family. The verified 3.135 V to 3.465 V core supply range centers around the conventional 3.3 V operating point and leaves only 165 mV of variation above nominal. A 125 MHz clock output can be enabled after power-up or reset by pulling the CLK125_EN strap-in pin high. In GMII mode, the dedicated GTX_CLK input accepts the MAC-provided transmit clock. These clock functions allow the digital Ethernet interface to be synchronized to the PHY without requiring every system to use an additional external clock source. The KSZ9021 is appropriate for industrial networking equipment, embedded Ethernet gateways, routers, switches, set-top equipment, and other systems that need a copper-Ethernet interface. The -40 °C to +85 °C operating range also makes it suitable for industrial equipment, although the final design must verify all voltage, timing, layout, and thermal requirements against the manufacturer datasheet. The 8 mm by 8 mm QFN-64 package supports dense PCB layouts but requires careful exposed-pad, via, and thermal-management practices. Input and output supplies should be decoupled close to their pins, and the Ethernet magnetics, clock source, media-dependent resistor networks, and signal-routing layout must follow the reference implementation in the manufacturer datasheet. This product page combines verified distributor pricing, availability, interface details, package information, and sourcing links with practical Ethernet design guidance. It also distinguishes verified facts from parameters that require confirmation in the full KSZ9021GN datasheet, avoiding unsupported substitution or compatibility claims.
KSZ9021GQ - Gigabit Ethernet Transceiver | Microchip
The Microchip Technology KSZ9021GQ is a single-port 10/100/1000Base-T Gigabit Ethernet transceiver with GMII/MII support, supplied in a 128-pin lead-free PQFP package measuring 14 x 20 mm. It provides the physical copper interface for Gigabit Ethernet processors and switches operating at 1000 Mbps or 10/100 Mbps, while Clause 28 auto-negotiation selects the highest common mode supported by both link partners. A Gigabit Ethernet transceiver is an interface IC that combines transmit and receive functions between a digital MAC and twisted-pair copper cabling. Within the network hierarchy, it connects an Ethernet MAC or switching silicon to 10/100/1000Base-T media, converting parallel digital traffic into physical-layer signaling and receiving signaling for delivery to the MAC. The GMII and MII interfaces provide standardized paths to compatible processors, switches, and controllers. The supplied data identifies full-duplex Gigabit Ethernet operation, 8/8 transceiver classification, GMII/MII compatibility, and a 3.3 V operating supply. Production-oriented features include parametric NAND tree fault detection, Micrel LinkMD time-domain-reflectometry cable diagnostics, and remote plus local loopback. These diagnostics help locate board I/O faults and faulty copper cabling during system bring-up, deployment, and manufacturing test. The KSZ9021GQ uses IEEE 802.3 Clause 28 auto-negotiation for UTP link partners. This allows 10 Mbps, 100 Mbps, or 1000 Mbps operation according to shared link capability rather than a fixed manual speed assumption. Its diagnostic architecture therefore supports both link establishment and fault isolation in industrial networking, embedded systems, communications equipment, test systems, and production lines. Typical deployments include single-port embedded Ethernet designs, industrial controllers, network interface adapters, communication appliances, and Gigabit switches. Designers should preserve the datasheet's recommended power, decoupling, magnetics, and copper-layout topology because high-speed analog performance depends on controlled supply noise, impedance, return paths, and transformer integration. Pin-level electrical and timing details must be taken directly from the manufacturer datasheet. A key sourcing consideration is package replacement. The KSZ9021GQ uses a 128-pin PQFP, whereas the related KSZ9021GN uses a 64-pin QFN. Those package options are not pin-compatible drop-in replacements for an existing 128-pin PCB, so migration requires a redesign rather than simple component substitution. Confirm availability, price, and lifecycle status with an authorized distributor before committing a production BOM. This page consolidates the verified manufacturer and distributor details for the KSZ9021GQ, adds diagnostics and interface context, and distinguishes true footprint compatibility from related but mechanically different KSZ9021 package variants. It is intended to accelerate engineering review while keeping unspecified electrical values explicitly marked for datasheet verification.
KSZ9021RL Gigabit Ethernet PHY, RGMII, 64-LQFP | Microchip
The Microchip Technology KSZ9021RL is a single-port Gigabit Ethernet physical-layer transceiver with integrated 10BASE-T, 100BASE-TX, and 1000BASE-T support, RGMII MAC interfacing, and a 64-pin lead-free E-LQFP package. It communicates over standard Category 5 unshielded twisted pair and supports IEEE 802.3 Clause 28 auto-negotiation so a link partner can select the highest mutually supported speed. The verified product information identifies 3.3 V operation, 1000 Mbps capability, and lead-free construction. A Gigabit Ethernet PHY, also called an Ethernet physical-layer transceiver, sits between a network media-access controller and the copper cable. It converts digital MAC data into electrical signals for transmission and converts received cable signals back into digital data. The KSZ9021RL is therefore positioned within the Ethernet interface hierarchy: network controller, interface transceiver, PHY, Ethernet transceiver, interface IC, and semiconductor. The KSZ9021 family provides RGMII support and a low-jitter 125 MHz reference-clock output on CLK125_NDO. That clock can provide a lower-cost reference-clock alternative for RGMII MACs that otherwise require a separate 125 MHz crystal or oscillator. Auto-negotiation follows IEEE 802.3 Clause 28 and selects the highest common operating mode between connected link partners. Its three-speed support allows one physical network interface to handle 10 Mb/s, 100 Mb/s, and 1000 Mb/s links. The KSZ9021RL is packaged in a 64-pin lead-free E-LQFP, while related KSZ9021RN, KSZ9021GN, and KSZ9021GQ order codes use different package configurations and pin counts. Package identity is essential during substitution: the 48-pin QFN RN version and the other family packages cannot be treated as pin-compatible replacements for the RL device. Although all use the KSZ9021 name, footprint and pin assignment must be checked before redesigning or sourcing a substitute. Typical applications include industrial Ethernet controllers, embedded network equipment, set-top boxes, digital media systems, and communication equipment using an RGMII-capable MAC. The device is appropriate when the design requires integrated triple-speed copper Ethernet, auto-negotiation, and a shared MAC interface rather than a purely passive or single-speed physical layer. Layout should treat the analog PHY and magnetics interface as a high-speed, sensitive signal path. Keep copper traces controlled, provide the decoupling and analog-supply arrangements required by the manufacturer datasheet, and route differential pairs away from noisy switching nodes. Verify magnetics, cable, termination, and thermal conditions against the complete system design rather than treating the PHY as a standalone digital component. This page combines verified manufacturer and distributor information with package-specific selection guidance, pricing, and practical Ethernet design considerations. It does not infer unreleased electrical limits or present package variants as drop-in substitutes when their footprints differ.