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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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KSZ9031MNXCC - Gigabit Ethernet PHY Transceiver 64-QFN | Microchip
KSZ9031MNXCC

KSZ9031MNXCC - Gigabit Ethernet PHY Transceiver 64-QFN | Microchip

The Microchip Technology KSZ9031MNXCC is a single-chip, triple-speed (10Base-T/100Base-TX/1000Base-T) Gigabit Ethernet physical layer transceiver packaged in a 64-pin QFN (8x8 mm) lead-free housing. It supports the IEEE 802.3 standard, integrates GMII and MII MAC-side interfaces with 3.3V, 2.5V, and 1.8V tolerant I/Os, and performs hardware auto-negotiation to automatically select the highest link-up speed across 10/100/1000 Mbps. On-die termination, baseline wander correction, and adaptive equalization provide robust signal integrity over Cat-5e twisted-pair copper media. A PHY (physical layer device) is the lowest layer of the OSI networking stack and is responsible for encoding/decoding analog line signals onto the cable and presenting a digital MAC interface to the link partner. The KSZ9031 family occupies the gigabit PHY tier of Microchip's networking IC hierarchy: PHY -> Ethernet transceiver -> network interface IC -> wired-connectivity semiconductor. Modern SoCs typically lack an integrated 1G copper PHY, so an external part like the KSZ9031MNXCC is required to connect to standard RJ-45 magnetics. Key differentiating features include a 1.2V core with integrated LDO regulators, Wake-on-LAN support, HP Auto-MDIX crossover detection, and a programmable LED interface for link/activity/speed indication. The device operates from a single 3.3V supply and consumes approximately 0.7W typical at gigabit full-duplex. Energy-detect power-down and link-disconnect modes drop quiescent power dramatically when the cable is unplugged, suiting always-on but power-conscious embedded designs. Typical applications include industrial Ethernet gateways, network routers and switches, IP cameras and surveillance NVRs, gaming consoles, set-top boxes, networked printers, and embedded Linux/SoC platforms that expose a GMII or MII bus. The part's AEC-Q100 absence directs designers to industrial-grade end equipment; for automotive Ethernet, Microchip's KSZ9031RNX series is the qualified counterpart. The 8x8 mm QFN-64 footprint is a widely adopted PHY footprint, simplifying PCB layout and enabling second-source flexibility. The 'CC' suffix indicates the commercial temperature grade (0C to +70C), distinguishing it from 'RNX' (industrial -40C to +85C) variants. When laying out the KSZ9031MNXCC, place the four differential MDI pairs as 100-ohm differential routes with length matching within 50 mils, isolate the analog ground island from the digital ground with a ferrite bead, and route the 25 MHz reference crystal within 5 mm of the XI/XO pins. Use the recommended Bob Smith termination network on unused MDI pairs to suppress common-mode noise. Reference the manufacturer datasheet GMII/MII timing diagrams for high-speed MAC interface traces.

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KSZ9031MNXIC - Automotive Gigabit Ethernet PHY | Microchip
KSZ9031MNXIC

KSZ9031MNXIC - Automotive Gigabit Ethernet PHY | Microchip

The Microchip KSZ9031MNXIC is an integrated triple-speed Ethernet physical-layer transceiver supporting 10Base-T, 100Base-TX, and 1000Base-T over standard CAT-5 unshielded twisted-pair cable. It is an automotive-qualified Gigabit Ethernet PHY with LinkMD cable diagnostics, supplied in a 64-pin lead-free QFN package measuring 8 mm by 8 mm. An Ethernet physical-layer transceiver, or Ethernet PHY, converts digital data from a network controller into electrical signals suitable for twisted-pair cabling and converts received signals back into digital data. The KSZ9031 belongs to the PHY layer within the Ethernet communication hierarchy, supporting copper Ethernet links in automotive, industrial, and embedded network equipment. Its triple-speed operation allows one physical-layer device to interoperate with 10, 100, and 1000 Mb/s network controllers. The verified source data identifies the KSZ9031 family as automotive qualified and highlights LinkMD cable diagnostics, power-saving features, and GMII/MII support. LinkMD diagnostics help a system identify cable faults such as opens, shorts, and incorrect wiring, reducing commissioning and maintenance time. GMII and MII compatibility gives designers flexibility when connecting the PHY to microcontrollers, network controllers, FPGAs, or other digital controllers. The device is packaged in a 64-QFN, 8 mm by 8 mm surface-mount format. Its exposed thermal construction and lead-free package support compact PCB designs, although final thermal performance depends on the PCB copper area, airflow, and the exact operating current established by the selected operating mode. Typical applications include automotive Ethernet gateways, vehicle infotainment systems, industrial Ethernet controllers, network switches, embedded servers, and equipment requiring copper Gigabit Ethernet connectivity. The KSZ9031MNXIC is appropriate when a design needs one PHY to cover legacy 10 Mb/s links as well as 100 Mb/s and Gigabit networks. For new layouts, engineers should follow the manufacturer reference schematic and pin definitions, preserve high-speed differential routing geometry, provide the required decoupling, and validate magnetics, cable, and connector compatibility. Existing boards should also verify controller voltage levels and interface timing before replacing another PHY. This page combines verified distributor and manufacturer information with application guidance, pinout documentation, and engineering considerations that help teams evaluate the KSZ9031MNXIC for new designs or replacement programs.

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KSZ9031RN - Triple-Speed Gigabit Ethernet PHY | Microchip
KSZ9031RN

KSZ9031RN - Triple-Speed Gigabit Ethernet PHY | Microchip

The Microchip Technology KSZ9031RN is an automotive-qualified, fully integrated triple-speed Ethernet physical-layer transceiver supporting 10Base-T, 100Base-TX, and 1000Base-T operation in a 48-QFN package measuring 7 mm by 7 mm. It links a digital network processor or Ethernet controller to standard CAT-5 unshielded twisted-pair cable through four integrated transceivers, while LinkMD cable diagnostics help identify wiring faults. An Ethernet PHY is the physical-layer component in a network communication hierarchy. It converts digital parallel or serial data from a MAC or network processor into electrical signaling suitable for copper cabling, then converts received signals back into digital data. A triple-speed Gigabit Ethernet PHY can negotiate 10 Mbps, 100 Mbps, or 1000 Mbps operation, allowing one physical network interface to support legacy and high-speed links. The KSZ9031 therefore sits between a network controller and an RJ45 connector or other CAT-5 medium interface. Key verified features include full-duplex operation across all three supported rates and digital I/O tolerance for 1.8 V, 2.5 V, and 3.3 V systems. The automotive qualification is particularly relevant to in-vehicle Ethernet designs. LinkMD diagnostics and production-test support improve commissioning and fault isolation, while the exposed pad in the 48-QFN package supports thermal performance. The supplied sources also describe parametric NAND-tree support for detecting faults between KSZ9031 I/O connections and the board. The KSZ9031 family supports GMII or MII digital interfaces according to its configuration. These interfaces connect the PHY to a MAC or Ethernet-capable system-on-chip using separate transmit and receive data paths plus control signals. Exact timing limits, register defaults, magnetics recommendations, and electrical characteristics must be taken from the manufacturer datasheet; they were not present in the supplied search excerpts and are therefore not inferred here. Typical uses include automotive Ethernet gateways, infotainment systems, vehicle domain controllers, industrial network interfaces, communications equipment, and other embedded systems that require copper Ethernet connectivity with cable diagnostics. An automotive network design can place the PHY beside the host processor and Ethernet magnetics, then use LinkMD results during production test or field maintenance to investigate cable, connector, and routing faults. Layout is critical because a 1000Base-T link depends on precise high-speed differential routing and controlled impedance. Follow the manufacturer reference layout and recommended component values rather than substituting generic magnetics or termination networks. Keep the exposed-pad thermal path unobstructed, provide the specified local decoupling, and route all four differential pairs as controlled-impedance PCB traces with suitable return paths. This page consolidates the verified manufacturer and distributor descriptions, available cross-reference evidence, application guidance, and design cautions. It distinguishes confirmed information from missing electrical details so that engineers can use it for initial device selection without mistaking unverified assumptions for datasheet specifications.

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KSZ9031RNXCC - Gigabit Ethernet PHY RGMII | Microchip
KSZ9031RNXCC

KSZ9031RNXCC - Gigabit Ethernet PHY RGMII | Microchip

The Microchip Technology KSZ9031RNXCC is a completely integrated triple-speed (10Base-T / 100Base-TX / 1000Base-T) Ethernet physical-layer transceiver for transmission and reception of data on standard CAT-5 unshielded twisted pair (UTP) cable, supplied in a 48-pin QFN (7x7 mm) package. It features an RGMII (Reduced Gigabit Media Independent Interface) that complies with the RGMII Version 2.0 specification, with on-chip data-to-clock delay timing and programming options to adjust TX/RX clock paths. A Gigabit Ethernet PHY (physical-layer transceiver) is the analog front-end of a wired Ethernet link, translating between digital MAC data and differential signaling on the copper cable while performing auto-negotiation, link training, and signal integrity compensation. Within the network hierarchy, the PHY sits below the MAC (media access controller) and above the magnetics + RJ-45 connector; together they form the OSI Layer-1 / Layer-2 boundary of an Ethernet port. KSZ9031RNXCC is part of Microchip's KSZ9031 family of integrated triple-speed PHYs and targets Gigabit Ethernet designs requiring low BOM cost. Key features include on-chip termination resistors for the four differential pairs, integrated LDO controller to drive a low-cost external MOSFET for the 1.2V core supply, automatic correction of differential pair misplacements and polarity reversals, programmable propagation delay compensation, and LinkMD cable diagnostics. The device also supports Energy Efficient Ethernet (EEE) IEEE 802.3az, Wake-on-LAN, and a hardware power-down (CPD) mode that draws only a few milliamps. The KSZ9031RNXCC uses a 1.2V core derived from an internal regulator that requires only a single external MOSFET and bypass caps, reducing total BOM by eliminating a standalone 1.2V LDO. The RGMII Version 2.0 timing is provided on-chip, so most designs need no external delay lines on the MAC-to-PHY strobe traces, which simplifies PCB layout. AEC-Q100 automotive qualification is available on certain KSZ9031 variants (consult the KSZ9031 family datasheet for specific ordering codes), making the device attractive for in-vehicle networking as well as industrial Ethernet. Typical applications include Gigabit Ethernet switches and routers, industrial control and factory automation nodes, set-top boxes and IPTV gateways, network-attached storage (NAS), automotive infotainment backbones, and any embedded Linux or RTOS board that needs a CAT-5 wired uplink with low component count. When designing with this part, follow the Microchip reference schematic: route the four MDI differential pairs with 100-ohm differential impedance and length matching within 50 mils, place the 1.2V MOSFET and bulk capacitors as close to the chip as possible, and use strap resistors on MODE[3:0] to set the default PHY address and operating mode. After hardware reset, software can re-program all strap options via the MDIO/MDC management interface. This page consolidates distributor pricing, drop-in alternatives within the same 48-QFN footprint, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single reference for board bring-up and second-sourcing decisions.

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KSZ9031RNXIA-TR - Gigabit Ethernet PHY RGMII 48-QFN | Microchip
KSZ9031RNXIA-TR

KSZ9031RNXIA-TR - Gigabit Ethernet PHY RGMII 48-QFN | Microchip

The Microchip Technology KSZ9031RNXIA-TR is a fully integrated triple-speed (10Base-T/100Base-TX/1000Base-T) Gigabit Ethernet physical-layer transceiver supplied in a 48-pin QFN (7x7 mm) package with exposed pad, qualified to industrial temperature grade. It implements the physical coding sublayer (PCS), physical medium attachment (PMA), physical medium dependent (PMD), and twisted-pair PHY functions required to deliver 10/100/1000 Mbps over standard CAT-5 UTP cable, and presents data to a host MAC through a Reduced Gigabit Media Independent Interface (RGMII). A gigabit Ethernet PHY (Physical Layer device) is the lowest layer of the OSI networking model and is responsible for converting digital data from a MAC controller into analog signals that traverse copper cabling, and vice versa. Modern Gigabit PHYs integrate DSP-based echo and crosstalk cancellers, adaptive equalization, and feed-forward correction to maintain 1000BASE-T link integrity across 100 m of CAT-5e cable. The KSZ9031 family belongs to the broader category of 10/100/1000 Ethernet transceivers, sitting below the MAC and above the magnetics in the typical BOM. Key features of the KSZ9031RNXIA-TR include: support for RGMII v1.3 and v2.0 (with on-chip delay), 1.8/2.5/3.3V tolerant I/O via separate VDDIO and AVDD rails, integrated termination resistors, LinkMD cable-diagnostics for open/short detection, IEEE 802.3az Energy Efficient Ethernet (EEE), 1588v2 timing support, and four-speed auto-negotiation with HP Auto-MDIX. The device is supplied in a 7x7 mm 48-QFN package that requires only a 25 MHz reference clock. Architecturally, the KSZ9031 uses a DSP-based receiver with adaptive equalization and baseline wander correction, combined with a class-AB line driver. The internal PHY address, mode, and clock-skew straps are sampled at RESET_N de-assertion through the MODE[3:0] pins, allowing board designs to configure RGMII timing, EEE, and reference-clock mode without external EEPROM in most cases. Management is performed through a standard MDC/MDIO two-wire serial interface (clause 22 and clause 45). Typical applications include industrial Ethernet switches, automotive infotainment and ADAS camera links, factory automation PLCs, IP set-top boxes, network-attached storage (NAS), and any embedded design that needs a wired 1 Gbit/s uplink to a host processor or switch. The industrial temperature range (-40C to +85C) makes the KSZ9031RNXIA-TR suitable for harsh-environment designs. When designing with this part, observe the 1.0 V (or 1.2 V) AVDD core supply sequencing relative to the 3.3 V analog rail, and place the 1.0 uF + 0.1 uF decoupling pair as close to each AVDD pin as possible. Connect the central exposed pad (EPAD) to a solid ground pour to meet the 31.6 C/W thermal resistance, and follow Microchip's reference MDI layout in the datasheet to maintain 1000BASE-T return loss. The -TR suffix indicates Tape and Reel packaging for high-volume assembly. This page synthesizes distributor pricing, same-package drop-in alternatives from the KSZ9031 family, and practical design notes not aggregated in a single location in the manufacturer datasheet. Cross-reference material is drawn from DigiKey, Mouser, LCSC, and Microchip application note AN2918 (KSZ9031RNX to KSZ9131RNX migration guide).

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KSZ9031RNXIC - Gigabit Ethernet PHY Transceiver, RGMII, 48-QFN | Microchip
KSZ9031RNXIC

KSZ9031RNXIC - Gigabit Ethernet PHY Transceiver, RGMII, 48-QFN | Microchip

The Microchip Technology KSZ9031RNXIC is a completely integrated triple-speed (10Base-T / 100Base-TX / 1000Base-T) Ethernet physical-layer transceiver designed for transmission and reception of data on standard CAT-5 unshielded twisted pair (UTP) cable, packaged in a 48-pin QFN (7x7 mm) with exposed pad. It supports RGMII version 2.0 timing with on-chip programmable delay and provides a single-chip Gigabit Ethernet interface for IEEE 802.3 applications. A Gigabit Ethernet PHY (Physical Layer transceiver) is the analog front-end IC that connects a MAC (Media Access Controller) to a copper cable, performing PCS/PMA encoding, line driving, echo/next-cable cancellation, and link training. The KSZ9031RNXIC belongs to the Ethernet transceiver family -> network interface IC -> communication semiconductor hierarchy, and is fully compliant with IEEE 802.3 10/100/1000BASE-T specifications. Synonyms for this category include GbE PHY, Gigabit Ethernet transceiver, and triple-speed Ethernet PHY. Key features include support for 10/100/1000 Mbps operation, RGMII interface with on-chip timing delay per RGMII v2.0 (with programming options for external delay adjustment), LinkMD cable diagnostics for cable health monitoring, Wake-on-LAN (WoL) support, and integrated termination resistors that eliminate the need for external magnetics-side resistor networks. The device operates from 1.8V/2.5V/3.3V supplies and offers automotive temperature grade options (KSZ9031RNXIA variant is AEC-Q100 qualified). Architecturally, the KSZ9031RNXIC uses a DSP-based echo and crosstalk canceller with a 4-channel (A/B/C/D) analog front end, supporting auto-negotiation and auto-MDI/MDIX crossover. Its on-chip RGMII delay eliminates the PCB trace-length matching constraint required by RGMII v1.3 designs, simplifying layout for SoC + PHY interconnects. The 48-QFN package provides a low thermal resistance path and a small PCB footprint for space-constrained designs. Typical applications include industrial Ethernet switches, automotive gateway ECUs, IP surveillance cameras, network routers and switches, industrial automation controllers, and any embedded system requiring a wired 10/100/1000 Mbps Ethernet uplink. The RGMII bus makes the part a natural companion to NXP i.MX, Microchip SAMA5/SAM9, and TI Sitara host processors. When designing with this part, follow the KSZ9031RNX Hardware Design Checklist (Microchip DS00003391) for magnetics selection, RJ45 integration, and power-rail decoupling. Use a 25 MHz reference crystal or 25 MHz LVCMOS clock source, and route the RGMII traces length-matched within 50 mils if on-chip delay is disabled. This page consolidates distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, including a same-package alternative comparison versus the KSZ9031MNX family.

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KSZ9031RNXIC-TR - GbE PHY Transceiver RGMII 48-QFN | Microchip
KSZ9031RNXIC-TR

KSZ9031RNXIC-TR - GbE PHY Transceiver RGMII 48-QFN | Microchip

The Microchip Technology KSZ9031RNXIC-TR is a fully integrated triple-speed Gigabit Ethernet physical-layer transceiver (PHY) supporting 10Base-T, 100Base-TX, and 1000Base-T over standard CAT-5 unshielded twisted-pair cable, housed in a 48-pin QFN (7x7 mm) package with RGMII MAC-side interface. Key features include 1.8V/2.5V/3.3V tolerant I/O supplies, on-chip termination resistors, LinkMD cable-diagnostics, and an automotive-grade (-40C to +85C industrial; -40C to +125C automotive) operating range. The KSZ9031 integrates the physical coding sublayer (PCS), physical medium attachment (PMA), and physical medium dependent (PMD) layers in one die, reducing the BOM to a single 25 MHz reference crystal, an RJ45 jack with integrated magnetics, and a few decoupling capacitors. A Gigabit Ethernet PHY (Physical-layer transceiver) is the analog front-end that connects a digital Media Access Controller (MAC) to the copper cable plant. It performs line-side encoding/decoding (PAM-5 with 4D-PAM5 trellis coding for 1000Base-T), echo/return-loss cancellation, baseline-wander correction, and equalization, then exposes clean digital data to the MAC over RGMII, GMII, or MII. In the broader taxonomy: PHY > Ethernet transceiver > network interface IC > wired-communication semiconductor. The KSZ9031 belongs to the IEEE 802.3 Ethernet family (10/100/1000 Mbps). The KSZ9031's RGMII timing and programmable skew on TX/RX clock lines simplify PCB routing versus GMII. The integrated 1000Base-T transceiver delivers sub-microsecond latency and complies with IEEE 802.3, 802.3u, and 802.3ab. LinkMD TDR-based cable diagnostics detect open/short and estimate cable distance, helping field-debug link failures. Hardware strap pins configure default speed, MDI/MDIX, and operating mode without firmware. Typical applications include automotive infotainment and driver-assistance Ethernet, industrial Ethernet switches and PLCs, embedded router/gateway boards, IP cameras, and any Linux/embedded SoC board needing a 1 Gbit/s copper network port. The KSZ9031RNXIC-TR is widely designed in with NXP i.MX, TI Sitara, and Microchip SAMA7G7 host CPUs. When designing with this part, place the 25 MHz crystal within 5 mm of the XI/XO pins, keep the analog 1.2V AVCC plane isolated from digital 3.3V IO, and ensure the RJ45 magnetics center-tap is correctly terminated per the KSZ9031 reference schematic. Use LinkMD to put 100/1000 link margins on every board pre-shipment. This page synthesizes distributor pricing, drop-in alternatives, automotive-grade options, and practical PCB layout notes not found in the manufacturer datasheet, providing a one-stop resource for engineers evaluating GbE PHYs.

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KSZ9031RNXUB-TRVAO - Gigabit Ethernet PHY Transceiver | Microchip
KSZ9031RNXUB-TRVAO

KSZ9031RNXUB-TRVAO - Gigabit Ethernet PHY Transceiver | Microchip

The Microchip KSZ9031RNXUB-TRVAO is a fully integrated triple-speed (10Base-T/100Base-TX/1000Base-T) Gigabit Ethernet physical-layer transceiver with RGMII/GMII/MII MAC interface support, supplied in a 48-pin lead-free WQFN package with wettable flanks. A Gigabit Ethernet physical-layer transceiver (PHY) is a mixed-signal IC that implements the Physical Coding Sublayer (PCS), Physical Medium Attachment (PMA), and Physical Medium Dependent (PMD) sublayers defined in IEEE 802.3. It connects an Ethernet MAC (typically inside an SoC, MCU, or FPGA) to a copper medium via magnetics and a RJ-45 connector. The KSZ9031 family belongs to Microchip's ethernet transceiver category, sitting between the MAC layer and the magnetics in the OSI stack. Within the broader taxonomy: ethernet transceiver -> physical layer device (PHY) -> network IC -> interface IC -> semiconductor. The PHY converts parallel MAC-side data into serial 1.25 Gbaud symbols for 1000Base-T, with all baseband echo-cancellation, cross-talk cancellation, and baseline-wander correction performed on-chip. Key specifications include support for 10/100/1000 Mbps operation over standard CAT-5 UTP cable, 1.8V/2.5V/3.3V supply rails, four drivers and four receivers, full-duplex operation, programmable LED outputs for link/activity/speed indication, and energy-detect power-down plus Wake-on-LAN (WOL) with custom-packet detection. The device exposes a 125 MHz reference clock output and supports the RGMII v1.3 / v2.0 specification with on-chip DLL for skew-compensation between clock and data. Hardware configuration is performed via strap-in pins and an MDC/MDIO management interface. Architecturally, the KSZ9031 uses a DSP-based digital adaptive equalizer and on-die line termination, eliminating the need for external termination resistors. It integrates baseline-wander correction, feed-forward equalization (FFE), decision-feedback equalization (DFE), and a 4D-PAM5 trellis decoder, achieving robust BER performance on CAT-5 cable exceeding 100m. The analog front-end operates from a single 3.3V analog supply with an internal LDO providing 1.2V to the digital core. Typical applications include automotive infotainment and telematics ECUs, ADAS domain controllers, industrial Ethernet gateways, in-vehicle networks (IVN), and any AEC-Q100 qualified Ethernet node. The KSZ9031RNXUB-VAO variant is AEC-Q100 Grade 2 qualified, supporting automotive operating temperatures from -40C to +105C, while the standard commercial KSZ9031RNX targets 0C to +70C. When designing with this transceiver, follow Microchip reference designs for the magnetics (1:1 center-tapped) and 49.9 ohm termination layout to preserve IEEE 802.3 compliance. Decouple each supply pin with a 0.1 uF ceramic capacitor placed within 3 mm of the pin, and provide a separate analog and digital ground plane tied together at a single point under the IC. This page synthesizes distributor pricing, AEC-Q100 qualified drop-in alternatives, and practical PCB layout guidance not found in the manufacturer datasheet alone, giving automotive hardware engineers a single reference for sourcing and second-sourcing this Ethernet PHY.

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