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KSZ8893MQL - 3-Port 10/100 Managed Ethernet Switch | Microchip
KSZ8893MQL

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.

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KSZ8893MQLI - 3-Port 10/100 Managed Ethernet Switch | Microchip
KSZ8893MQLI

KSZ8893MQLI - 3-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip Technology KSZ8893MQLI is an integrated three-port 10/100 Mbps Layer 2 managed Ethernet switch with integrated PHYs, CPU control and data interfaces, and support for 10/100 Base-FX/T/TX connectivity. The device is supplied in a 128-PQFP package measuring 14 x 20 mm and includes I2C and SPI host interfaces for configuration and control. An Ethernet switch is a semiconductor that connects multiple physical-network endpoints, forwards Ethernet frames according to learned MAC addresses, and separates traffic into collision domains. A managed Layer 2 switch adds configurable functions such as rate limiting, tag- and port-based VLANs, QoS priority, management, Management Information Base counters, and RMII, MII, or SNI CPU interfaces. The KSZ8893 is positioned for low-port-count, cost-sensitive embedded networking systems. The KSZ8893MQLI integrates three 10/100 Mbps Ethernet ports with PHYs and provides both management and data paths to an embedded processor. Supported management functions include rate limiting, VLAN operation, QoS priority, and MIB counters. I2C and SPI interfaces allow a host controller to configure the switch, while RMII, MII, and SNI options support processor-side connections. These capabilities make the device useful where several Fast Ethernet links must be consolidated without using a full-size external switch. The KSZ8893 family supports copper and fiber-oriented 10/100 networking and can serve as the central Layer 2 forwarding element in industrial controllers, embedded servers, communications equipment, and network appliances. Its managed features allow designers to partition traffic, prioritize latency-sensitive packets, and monitor port activity. The 128-PQFP package provides a high pin count suitable for parallel MII, RMII, SNI, management, media, and power connections. Typical deployments include factory automation controllers with Ethernet-connected sensors, compact industrial gateways, embedded network equipment, and OEM control systems. In these applications, the integrated PHYs reduce the number of discrete Ethernet components, while configurable VLAN and QoS features help separate equipment traffic from real-time control traffic. A processor can access switch registers and counters through I2C or SPI and connect through the supported CPU-side interface. Design the PCB around the manufacturer’s complete pin-description table and reference layout. Preserve the required Ethernet magnetics path, differential pair geometry, grounding, decoupling, and interface timing. Because this is a 128-pin PQFP, pin escaping and via planning are particularly important for the 14 x 20 mm footprint. Confirm the precise pin functions, strap requirements, clocking arrangement, and external-component recommendations in the Microchip datasheet before schematic release. This product page combines the manufacturer’s device description with package and sourcing information, practical integration guidance, and a parameter-level comparison framework. It helps engineers evaluate the KSZ8893MQLI against related Ethernet-interface options while keeping PCB compatibility, management features, and processor-interface requirements central to the selection decision.

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KSZ8895FMQ - 5-Port 10/100 Managed Ethernet Switch | Microchip
KSZ8895FMQ

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.

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KSZ8895FMQTR - 5-Port 10/100 Managed Ethernet Switch | Microchip (Tape & Reel)
KSZ8895FMQTR

KSZ8895FMQTR - 5-Port 10/100 Managed Ethernet Switch | Microchip (Tape & Reel)

Microchip Technology KSZ8895FMQTR 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.

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KSZ8895FQXC - 5-Port Managed Ethernet Switch | Microchip
KSZ8895FQXC

KSZ8895FQXC - 5-Port Managed Ethernet Switch | Microchip

The Microchip KSZ8895FQXC is a highly integrated, Layer 2 managed five-port Ethernet switch with 10/100 Base-T/TX PHY interfaces and support for MII and RMII host interfaces. It is packaged in a 128-pin PQFP measuring 14 x 20 mm and is associated with the automotive-qualified KSZ8895 family. Its five-port configuration consolidates multiple Ethernet links into one switching device, reducing component count and simplifying board-level network design. An Ethernet switch is a Layer 2 network semiconductor that forwards Ethernet frames between connected ports according to MAC addresses. The KSZ8895FQXC integrates five 10/100 Ethernet ports with a configurable managed-switch architecture, allowing multiple embedded devices or computers to share a local Ethernet segment. MII and RMII interfaces connect the switch to a host controller or system-on-chip, while the integrated PHYs simplify implementation of copper Ethernet connections. The KSZ8895 family provides managed Layer 2 switching, programmable LED indication, cable diagnostics, optical-fiber support, and a low-power mode, as identified in the Microchip product description and distributor feature listing. These capabilities make the device suitable for automotive Ethernet networks, industrial Ethernet equipment, embedded gateways, and compact network appliances. A managed switch also provides better visibility into port operation and link diagnostics than a basic unmanaged switch. The FQXC ordering designation identifies the device variant offered in a 128-pin PQFP. The package provides 128 electrical positions and is substantially larger than a typical QFN network switch, making the KSZ8895FQXC especially appropriate for designs that prioritize a high pin count and legacy-style leaded-package assembly rather than minimal PCB area. Product-family variants use related package and temperature-grade options, but compatibility must be checked against the exact ordering code. Typical applications include automotive infotainment and vehicle Ethernet gateways, industrial controllers with multiple 10/100 ports, embedded Ethernet concentrators, and low-power network appliances. The switch can connect several physical network segments to one host processor while providing programmable port-status indication and cable diagnostics. Designers should reserve suitable Ethernet magnetics and compliant connector structures for each copper port and ensure the host interface timing is correctly configured. A key design consideration is thermal and layout planning for a 128-pin device. Place the controller and memory components needed by the selected platform arrangement according to the manufacturer reference design, keep high-speed host traces short, and provide continuous ground-plane connectivity. Validate magnetics, impedance-controlled traces, isolation requirements, and automotive EMC constraints before releasing the PCB. This product page combines the exact KSZ8895FQXC ordering information with same-package family alternatives, interface and package comparisons, application guidance, and practical PCB considerations. It also distinguishes confirmed drop-in candidates from options that require engineering review, helping buyers identify where a direct replacement is appropriate and where a redesign is necessary.

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KSZ8895FQXI - 5-Port 10/100 Managed Ethernet Switch | Microchip Technology
KSZ8895FQXI

KSZ8895FQXI - 5-Port 10/100 Managed Ethernet Switch | Microchip Technology

The Microchip Technology KSZ8895FQXI is an automotive-qualified, highly integrated Layer 2 managed five-port Ethernet switch with integrated 10BASE-T/100BASE-TX physical-layer transceivers and MII/RMII interfaces. It operates with a 3.3 V operating voltage and is housed in a 128-pin PQFP package measuring 14 mm by 20 mm. The switch supports five 10/100 Ethernet ports and is designed to reduce system cost by integrating network-interface functions that otherwise require discrete PHY and switching components. An Ethernet switch is a Layer 2 networking semiconductor that receives Ethernet frames on one port and forwards them to the appropriate destination port using MAC-address information. The KSZ8895 belongs to the broader hierarchy of Ethernet interface controllers, network switches, Layer 2 devices, and integrated network semiconductors. Its managed architecture allows a host processor or network controller to configure port behavior, while its MII and RMII interfaces support integration with embedded processors, field-programmable gate arrays, application processors, and industrial controllers. The KSZ8895FQXI provides five integrated 10/100 Ethernet ports, MII and RMII connectivity, and a single 3.3 V operating voltage. Its 128-PQFP 14 x 20 mm package exposes the switch, copper-physical-layer, control, management, clock, and power interfaces through 128 contacts. The automotive qualification indicated by Microchip makes the device relevant to vehicle-network designs as well as industrial, communications, and embedded applications requiring a compact managed Ethernet switch. A single-chip switching design can also reduce board area, external PHY count, and system-level assembly complexity. Microchip's integrated 10/100 Ethernet-switch implementation combines the 100BASE-TX drivers and 10BASE-T drivers so both can use the same magnetics. The 10BASE-T driver is incorporated into the 100BASE-T driver, with internally wave-shaped and pre-emphasized outputs having a typical 2.3 V amplitude. This integration supports shared copper-magnetics designs while preserving separate logical support for 10 Mb/s and 100 Mb/s operation. Management features are included at the Layer 2 level rather than requiring a separate switch controller for basic port management. Typical applications include automotive infotainment and in-vehicle networking, industrial Ethernet gateways, factory automation controllers, building-automation equipment, communications equipment, and embedded systems that need several 10/100 ports behind one processor interface. MII is useful when the connected host requires parallel data and control signals, while RMII reduces the number of interface signals in designs where pin density is constrained. The integrated copper PHYs also support designs intended to connect directly to Ethernet magnetics and RJ45 front ends. Hardware implementation requires careful attention to the manufacturer's KSZ8895FQX Hardware Design Checklist. The checklist specifies the RJ45 transmit-channel connections, including TX+ on RJ45 pin 3, TX- on RJ45 pin 6, and a 75-ohm series termination path through a 1000 pF, 2 kV capacitor to chassis ground. These network-interface details should be implemented exactly as described in the manufacturer document rather than inferred from generic Ethernet layouts. This product page combines the confirmed five-port 10/100 switch functionality, package information, manufacturer guidance, qualified replacement relationships, and practical hardware-design guidance. It is intended to help engineers identify the correct Microchip orderable variant, plan the MII or RMII host connection, and evaluate whether the same-package KSZ8895 family can satisfy a lifecycle or sourcing requirement without changing the PCB footprint.

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KSZ8895MLUB - 5-Port 10/100 Managed Ethernet Switch | Microchip
KSZ8895MLUB

KSZ8895MLUB - 5-Port 10/100 Managed Ethernet Switch | Microchip

Microchip Technology KSZ8895MLUB is an automotive-qualified, highly integrated Layer 2 managed Ethernet switch with five ports, 10/100 Mbps Ethernet performance, and a 128-LQFP package measuring 14 x 14 mm. It integrates five MAC units, four 10/100BASE-TX PHYs, a non-blocking switch fabric, and management interfaces including I2C and SPI. An Ethernet switch is a Layer 2 network device that receives Ethernet frames on one port and forwards them to the appropriate destination port. The managed-switch category adds address learning, frame filtering, traffic control, and configuration functions to the basic frame-forwarding hierarchy. The KSZ8895MLUB combines these network functions with integrated physical-layer transceivers, reducing the component count required for a compact Ethernet switching subsystem. The device provides four integrated 10/100BASE-TX PHYs and five MACs within a single package. Its internal architecture includes a dedicated address lookup engine, an on-chip frame buffer, and a high-speed non-blocking switch fabric. I2C and SPI interfaces allow a host processor to configure switch functions, while an internal core power controller supports system power management. On-chip termination is intended to reduce the system cost of cost-sensitive 10/100 Mbps five-port switch designs. The KSZ8895 family is qualified to meet AEC-Q100 requirements for automotive applications. This qualification is important for vehicle-network equipment exposed to demanding temperature and reliability conditions. The combination of five MACs, four integrated PHYs, managed Layer 2 operation, and mixed-signal PHY technology supports compact Ethernet switches for automotive infotainment, vehicle connectivity, industrial networking, and embedded communications systems. Typical implementations use the KSZ8895MLUB where multiple 10/100BASE-TX links must be consolidated through a compact managed switch. It can connect several embedded Ethernet endpoints to an uplink while the host controller handles configuration, status monitoring, and network policy. Its four integrated PHYs reduce the need for external copper transceivers, although one interface position may require additional PHY support depending on the system configuration. When designing a PCB, place the 128-LQFP device to minimize trace lengths from each Ethernet magnetic-interface component and keep high-speed digital and analog supply paths well separated. Follow the pin-description table and recommended decoupling network in the manufacturer datasheet. Provide adequate copper area and thermal paths around the LQFP, and verify magnetics, impedance, reset sequencing, and management-bus pullups against the application circuit. This page combines the manufacturer datasheet, distributor listings, package information, automotive qualification details, and cross-reference findings in a format that supports design selection, PCB planning, sourcing, and direct engineering comparison. The listed alternatives are limited to parts for which package and pin compatibility can be established rather than inferred from broad Ethernet-switch similarity.

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KSZ8895MQ - 5-Port 10/100 Managed Ethernet Switch | Microchip
KSZ8895MQ

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.

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KSZ8895MQI - 5-Port 10/100 Ethernet Switch | Microchip
KSZ8895MQI

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.

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KSZ8895MQXC - 5-Port 10/100 Managed Ethernet Switch | Microchip
KSZ8895MQXC

KSZ8895MQXC - 5-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip Technology KSZ8895MQXC is an automotive-qualified, highly integrated Layer 2 managed Ethernet switch with five 10/100BASE-T/TX ports, MII and RMII host interfaces, and I2C and SPI management connectivity in a 128-pin PQFP package measuring 14 x 20 mm. The device consolidates five Fast Ethernet PHYs, a managed switching core, and host-side interfaces into one network-connectivity device. A managed Ethernet switch is a semiconductor that connects multiple Ethernet endpoints through an internal Layer 2 forwarding engine. The KSZ8895MQXC occupies the managed switch and Ethernet interface IC category, combining copper Ethernet PHYs with configurable traffic management. This integration reduces the number of discrete network components required in industrial, automotive, communications, and embedded equipment while supporting centralized configuration over I2C or SPI. Key features include five 10/100 Mb/s Ethernet ports, MII and RMII connectivity, and a Layer 2 managed switch architecture. According to the Microchip product page, the KSZ8895 family is automotive qualified and designed to reduce system cost. The MQX ordering variant supports managed switch operation with MII and RMII interfaces, while the family also includes variants offering related clock-output or fiber-oriented connectivity options. The KSZ8895 integrates five 10/100BASE-TX transceivers with a Layer 2 switch fabric, allowing each port to connect to an Ethernet PHY, magnetics-based network interface, or other suitable 10/100BASE-T endpoint. Its MII interface supports parallel host connectivity, while RMII reduces the number of host-side signal lines by using a reduced pin interface. Management access through I2C and SPI supports configuration of operating parameters without requiring discrete configuration storage for basic switch functions. Typical applications include automotive Ethernet gateways, industrial Ethernet controllers, embedded communications equipment, network interface cards, and terminal systems requiring several Fast Ethernet ports in one device. The 128-pin PQFP package provides adequate routing space for five integrated PHYs, the switch core, management interfaces, clocking, power, and ground connections. A new board design should follow the KSZ8895MQX Hardware Design Checklist for termination, layout, and interface guidance. Layout and signal-integrity discipline are critical because five integrated PHYs place multiple high-speed differential and digital signals on one PCB. Place the device in accordance with the manufacturer hardware checklist, provide the required local bypass capacitors, route Ethernet differential pairs as controlled-impedance nets, and keep switching and clock sources away from sensitive analog and magnetics interfaces. This product page brings together the verified manufacturer product description, family datasheet, hardware design checklist, lifecycle-oriented family information, package details, and application guidance. It also distinguishes directly related family variants while preserving the important engineering distinction between a qualified drop-in substitute and a device with different interface or clock behavior.

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KSZ8895MQXI - 5-Port 10/100 Managed Ethernet Switch | Microchip
KSZ8895MQXI

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.

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KSZ8895MQXIA - 5-Port 10/100 Managed Ethernet Switch | Microchip
KSZ8895MQXIA

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.

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KSZ8895RQI - 5-Port 10/100 Managed Ethernet Switch | Microchip
KSZ8895RQI

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.

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KSZ8895RQXC - 5-Port 10/100 Managed Ethernet Switch | Microchip
KSZ8895RQXC

KSZ8895RQXC - 5-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip Technology KSZ8895RQXC is an integrated five-port 10/100 managed Ethernet switch with an MII or RMII interface, supplied in a 128-PQFP package measuring 14 mm by 20 mm. It is the RQXC ordering variant of the KSZ8895 family, which Microchip describes as an automotive-qualified, highly integrated Layer 2 managed switch designed to reduce system cost. An Ethernet switch is a networking semiconductor that connects multiple physical-layer ports to a higher-level communications interface and supports Layer 2 frame forwarding. Within the networking hierarchy, the KSZ8895RQXC is an Ethernet switch controller and interface IC. It consolidates five 10/100 Ethernet ports, integrated switching resources, management features, and an MII/RMII processor interface into one package, reducing the component count and board area required for an embedded Ethernet node. The primary feature set includes five integrated 10/100 ports, Layer 2 managed-switch operation, and support for MII and RMII host interfaces. The MII option provides a parallel Ethernet control interface, while RMII reduces the number of host-interface signals when the connected processor includes an RMII controller. These choices let the same switch family address embedded systems with different processor-interface requirements. The KSZ8895RQXC is positioned for industrial, automotive, and other embedded networking systems where multiple wired Ethernet endpoints must connect to a central system-on-chip, microcontroller, or network processor. Its managed Layer 2 functionality supports network control beyond simple frame forwarding, while the integrated switch architecture can shorten the path between attached devices and the upstream network. Engineers should use the manufacturer pin-description table and electrical-characteristics section when assigning PCB signals, setting the host interface, selecting magnetics, and calculating power dissipation. The 128-PQFP package requires careful escape routing because its high pin count and exposed thermal-management requirements make PCB layout more demanding than a leadless switch package. This page summarizes the confirmed switch, interface, package, and ordering information, then adds practical selection guidance for evaluating the KSZ8895RQXC in embedded Ethernet designs. For current commercial availability and lead time, use the Request a Quote form on this page.

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KSZ8895RQXI - 5-Port 10/100 Managed Ethernet Switch | Microchip
KSZ8895RQXI

KSZ8895RQXI - 5-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip KSZ8895RQXI is a highly integrated, automotive-qualified, Layer 2 managed Ethernet switch with five 10/100 Base-T/TX ports, MII and RMII interfaces, and a 128-pin PQFP package measuring 14 x 20 mm. Its combination of five copper ports, integrated Layer 2 management, and flexible host-interface support makes it suitable for compact embedded Ethernet systems. An Ethernet switch is a network-semiconductor device that connects multiple physical Ethernet endpoints through one integrated switching fabric. Within the broader hierarchy, the KSZ8895RQXI is an Ethernet interface IC, a Layer 2 switch, and a power-management-conscious embedded networking component. Instead of requiring five individual PHY channels and a separate switch controller, the device consolidates these functions into a single package while presenting the host processor with an MII or RMII connection. The principal features are five integrated 10/100 Ethernet ports, Layer 2 managed-switch operation, MII and RMII host interfaces, automotive qualification, and a 128-PQFP industrial package. The MII interface supports a parallel processor-facing data path, while RMII reduces the number of host signals and board routing requirements. These two options allow the same switch family to address processors with different Ethernet-MAC interfaces. Because the KSZ8895RQXI integrates several networking functions, PCB designers can reduce external component count and simplify the relationship between the processor, copper Ethernet ports, magnetics, and management circuitry. Its Layer 2 architecture is appropriate for local traffic classification, port monitoring, VLAN-oriented control, and other managed-switch functions implemented through its register interface. The manufacturer product page describes the device as a five-port Layer 2 managed switch designed to reduce system cost. Typical implementations include industrial Ethernet control equipment, automotive embedded networking, factory automation, building infrastructure, and compact communication appliances. In each case, the five integrated ports can connect local sensors, service interfaces, service modules, or other Ethernet nodes while the host processor supervises configuration through MII or RMII. Automotive-qualified versions are particularly relevant where network equipment must operate in a harsh electrical environment. Layout should preserve the high-speed differential characteristics of every 10/100 copper port and keep the RMII or MII interface away from switching-node energy. The 128-pin PQFP package requires careful escape routing, and its 14 x 20 mm body is substantially larger than modern QFN alternatives. Designers should therefore evaluate board area, assembly tooling, thermal performance, and connector placement before committing the footprint. This product page combines the Microchip five-port managed-switch positioning, package and interface details, drop-in family alternatives, application guidance, and comparison information. It is intended to help engineers evaluate the KSZ8895RQXI against same-package variants without confusing temperature-grade, packing, and interface options with functional differences.

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KSZ8995FQI - 5-Port 10/100 Managed Ethernet Switch | Microchip
KSZ8995FQI

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.

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KSZ8995MAI - 5-Port 10/100 Managed Ethernet Switch | Microchip
KSZ8995MAI

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.

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KSZ8999I - 9-Port 10/100 Switch w/ PHY & Frame Buffer | Microchip
KSZ8999I

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.

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KSZ9021GNI - Gigabit Ethernet PHY | Microchip Technology
KSZ9021GNI

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.

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KSZ9021GQ - Gigabit Ethernet Transceiver | Microchip
KSZ9021GQ

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.

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KSZ9021RL Gigabit Ethernet PHY, RGMII, 64-LQFP | Microchip
KSZ9021RL

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.

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KSZ9021RLI - Gigabit Ethernet PHY Transceiver, RGMII, 64-LQFP-EP | Microchip
KSZ9021RLI

KSZ9021RLI - Gigabit Ethernet PHY Transceiver, RGMII, 64-LQFP-EP | Microchip

The Microchip Technology KSZ9021RLI is a single-port Gigabit Ethernet Physical Layer Transceiver (PHY) supporting 10Base-T, 100Base-TX, and 1000Base-T data rates over standard CAT-5 UTP cable. Housed in a 64-pin E-LQFP (10x10 mm) exposed-pad package, the device integrates GMII, MII, and RGMII MAC interfaces, delivering a 1 Gbps data rate with on-chip termination and LinkMD cable diagnostics. The KSZ9021RLI operates from a 3.3V supply (3.135V to 3.465V) with internal 1.2V LDO for the core, and uses 1.2V or 3.3V interface logic. An Ethernet PHY (Physical Layer transceiver) is the analog front-end that connects a Media Access Controller (MAC) to twisted-pair copper cabling, encoding/decoding MLT-3 and PAM-5 line signals and performing 1000Base-T echo cancellation, equalization, and cross-talk suppression. The KSZ9021 sits at the boundary between the digital MAC and the analog copper medium (RJ45), and is part of the broader Ethernet PHY family -> Ethernet transceiver -> network interface IC -> communication IC hierarchy. Modern Gigabit PHYs such as the KSZ9021 typically integrate DSP-based adaptive equalization to recover signals across 100m of CAT-5e cable. Key features include 1 Gbps line-side throughput with on-chip 100-ohm termination resistors, LinkMD TDR-based cable diagnostics for identifying open/short faults, Energy-Efficient Ethernet (EEE) support for IEEE 802.3az power-saving states, and integrated 1.2V regulator. The exposed thermal pad on the LQFP-EP package reduces theta_JA for high-temperature industrial environments (-40C to +85C operating range). Architecturally, the KSZ9021RL combines a DSP-based echo canceller, an MLT-3/PAM-5 line driver, and a digital RGMII/GMII serializer with auto-negotiation and HP Auto-MDIX for automatic polarity reversal. The internal reference clock can be supplied via a 25 MHz crystal or external oscillator, simplifying BOM cost versus PHYs that require separate reference clocking. Typical applications include industrial Ethernet switches, IP cameras and surveillance NVRs, programmable logic controllers (PLCs), networked printers, Gigabit network interface cards, and embedded Linux/Windows networking gateways. The RGMII interface is favored for high-speed connections to Marvell, Broadcom, and ARM-based SoCs that lack integrated PHY. Design consideration: Place the KSZ9021 within 25 mm of the RJ45 magnetics and keep the MDI traces impedance-matched (100-ohm differential) and length-matched to within 2 mm. Use the exposed pad as the primary heatsinking path and stitch it to a ground pour for EMI containment. This page synthesizes distributor pricing, drop-in alternatives, and practical PCB layout/design notes not found in the manufacturer datasheet, providing actionable engineering guidance beyond the raw datasheet content.

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KSZ9021RN Gigabit Ethernet Transceiver | Microchip
KSZ9021RN

KSZ9021RN Gigabit Ethernet Transceiver | Microchip

The Microchip Technology KSZ9021RN is a single-chip 10/100/1000 Mbps IEEE 802.3 Ethernet transceiver with RGMII support, supplied in a 48-pin 7 x 7 mm QFN package. It supports 3.3 V operation with 2.5 V-tolerant GMII, MII, and RGMII I/O, and provides programmable transmit and receive delays for board-timing adjustment. An Ethernet PHY, or physical-layer transceiver, converts digital data from a network controller into electrical signals for copper cabling and converts received signals back into digital data. The KSZ9021 belongs to the Ethernet transceiver hierarchy alongside network-interface controllers, magnetics, connectors, and CAT5e/CAT6 cabling. It handles the physical layer while the linked controller manages higher-level frame processing. The device supports automatic negotiation of 10, 100, or 1000 Mbps operation. Its RGMII interface is associated with the KSZ9021R configuration, while the datasheet describes 3.3 V/2.5 V-tolerant digital I/O and configurable timing delays on both transmit and receive paths. Loopback modes support verification of analog and digital paths, and Micrel LinkMD TDR-based cable diagnostics can identify faulty copper cables. The KSZ9021RN is the smaller package option within the KSZ9021 family. The manufacturer offers the same transceiver in a 64-pin lead-free E-LQFP as KSZ9021RL, a 64-pin lead-free QFN as KSZ9021GN, and a 128-pin lead-free PQFP as KSZ9021GQ. Only the 48-pin QFN ordering code is mechanically interchangeable with an existing KSZ9021RN footprint; the other family packages require PCB changes. Typical uses include industrial Ethernet equipment, network controllers, routers, switches, IP cameras, and embedded systems requiring a copper Ethernet physical layer. The RGMII timing controls are especially useful when signal-integrity or propagation-delay differences between controller and PHY require board-level compensation. Design the 48-QFN layout according to the manufacturer footprint and datasheet guidance, paying particular attention to exposed-pad thermal dissipation, copper-return paths, magnetics isolation, and RGMII trace matching. Confirm device programming, strap configuration, clock requirements, cable support, and operating-temperature grade before releasing a production design. This page consolidates verified manufacturer and distributor information, separates genuine drop-in choices from package variants, and adds application, sourcing, and design guidance beyond a basic distributor listing. Values not explicitly supplied by the verified sources remain explicitly marked as needed rather than estimated.

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KSZ9021RNI - Gigabit Ethernet PHY Transceiver, RGMII, QFN-48 | Microchip
KSZ9021RNI

KSZ9021RNI - Gigabit Ethernet PHY Transceiver, RGMII, QFN-48 | Microchip

The Microchip Technology KSZ9021RNI is a single-port triple-speed (10Base-T/100Base-TX/1000Base-T) Gigabit Ethernet physical-layer transceiver supporting RGMII, GMII, and MII MAC interfaces, packaged in a 48-pin QFN (7x7 mm) with exposed pad. It integrates an entire 1 Gbps PHY on-chip including a DSP-based physical block, line driver, encoder/decoder, and twisted-pair termination, communicating over standard CAT-5 unshielded twisted-pair cable. A Gigabit Ethernet PHY (Physical Layer Transceiver) is a mixed-signal IC that sits between the MAC layer of an Ethernet controller and the magnetic RJ-45 interface, performing analog line encoding (PAM-5 / MLT-3 / NRZ depending on speed), echo/next-crosstalk cancellation, adaptive equalization, and clock-data recovery. The KSZ9021 belongs to the Ethernet transceiver family of physical-layer devices, within the broader power management and data communication semiconductor category, supporting 1.0 Gbps full-duplex operation per IEEE 802.3. Key features include auto-negotiation and link detection, integrated 1.2V LDO, HP Auto-MDIX crossover support, low-power 25 MHz crystal reference, and on-chip termination resistors. The part supports Jumbo Frame sizes and Energy-Detect power-down modes. The 48-QFN exposed-pad package provides a low-thermal-resistance path suitable for industrial temperature operation from -40C to +85C. Architecturally, the device uses a DSP-based receive path with adaptive equalization and baseline wander correction, plus a line-driving block with on-chip termination. It interfaces to the host MAC through RGMII (the default mode) at 1.8V/2.5V/3.3V tolerant I/O, simplifying SoC connection across multiple voltage rails. Per Microchip datasheet DS00003050A, the part requires a single 3.3V supply, with the internal 1.2V core regulated by an integrated LDO. Typical applications include industrial Ethernet switches, IP cameras and surveillance equipment, network routers and gateways, broadband gateway and CPE platforms, and factory automation controllers. The wide -40C to +85C industrial temperature range makes it suitable for harsh-environment deployments where commercial-grade parts would fail. When designing with the KSZ9021RNI, follow the reference schematic in the datasheet for the analog supply decoupling scheme (separate AVDD33/AVDD18 decoupling with ferrite beads) and route the MDI differential pairs as 100-ohm differential lines. Note: per Microchip support, the KSZ9021 family is marked "Not recommended for new designs" with the KSZ9031 family as the recommended migration path. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that supplement the manufacturer datasheet with engineer-focused information for sourcing and design decisions.

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