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LAN9353/ML - 3-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip Technology LAN9353/ML is a fully integrated 3-port 10/100 managed Ethernet switch controller in a 64-pin QFN (9 x 9 mm) package with exposed pad. It provides three integrated 10/100BASE-T/TX PHYs, a switch fabric with per-port QoS, VLAN tagging and rate limiting, and an I2C/SMBus host interface for host-driven configuration. According to the Microchip LAN9353 datasheet (00001925A), the device supports interfaces at up to 200 Mbps via Turbo MII and runs from a 1.8 V to 3.3 V core supply. An Ethernet switch IC is a semiconductor that combines multiple Ethernet physical layer (PHY) transceivers with a frame-processing fabric in one package. A "managed" switch adds register-programmable features - VLAN tags, priority queues, traffic classifiers, port-based rate limits and loop/ingress filtering - that an unmanaged switch cannot offer. The LAN9353 sits in the hierarchy: Ethernet switch controller -> Ethernet interface IC -> network interface controller -> integrated circuit. Key features include three integrated 10/100 PHYs, full Auto-Negotiation with HP Auto-MDIX on every port, deterministic store-and-forward switching with 16 Kbyte frame buffers, and a host-accessible register set over I2C/SMBus for static and dynamic VLAN, QoS and port configuration. The switch fabric operates at 200 Mbps per port through Turbo MII for host or microcontroller connectivity. Internally the LAN9353 pairs a RISC-based switch core with three integrated 10/100BASE-T PHYs, and it targets cost-sensitive embedded designs where a discrete PHY plus external switch would add board area, cost and design effort. Integration reduces the number of magnetics, RJ-45 magnetics remain external, but the PHY analog, digital interfaces and management registers are consolidated on one die. Typical applications include embedded Linux and RTOS gateways, industrial and building automation controllers, consumer set-top and smart-home hubs, USB-to-Ethernet adapters, print servers and networked embedded instrumentation, where three copper ports plus host-managed configuration are required in a single 9 x 9 mm footprint. When designing with the LAN9353/ML, budget careful attention to the exposed thermal pad, the 1.8 V to 3.3 V supply sequencing and the I2C pull-up network. Because it is a managed switch, firmware or a host microcontroller must configure VLAN and QoS tables, or the device runs with its power-on defaults. This page consolidates distributor pricing, package and pin information, verified drop-in alternatives, and practical integration notes that are not presented together in the manufacturer datasheet.

LAN9353I/ML - 3-Port Managed Ethernet Switch | Microchip

The Microchip Technology LAN9353I/ML is a highly integrated 3-port managed Ethernet switch with integrated 10/100 Base-TX PHYs, an I2C management interface, and support for MII, RMII, Turbo MII, and dual RMII host connectivity. It is packaged in a 64-pin QFN measuring 9 mm by 9 mm, providing a compact solution for embedded networking designs. The device also supports optical-fiber connections, IEEE 1588 timestamping, cable diagnostics, low-power operation, power-on reset, and programmable LED indication. An Ethernet switch is a network-semiconductor device that connects multiple physical network ports and manages frame transfer between them and an embedded host. The LAN9353I/ML belongs to the Ethernet interface IC category, where it combines copper and fiber connectivity, media-independent host interfaces, management functions, and PHY integration. This combination reduces the number of separate networking components required in industrial controllers, embedded computing modules, consumer equipment, and connected products. The principal feature set includes three managed 10/100 Ethernet ports, integrated PHY functions, an I2C control interface, and flexible connectivity to a host processor through MII, RMII, Turbo MII, or dual RMII. IEEE 1588 timestamping provides support for time-sensitive network functions, while cable diagnostics help identify wiring faults. Programmable LEDs allow port activity and status to be presented locally, and low-power mode supports designs where sustained Ethernet activity is not always required. The 64-QFN package is intended for compact embedded systems and offers a single highly integrated device instead of a discrete switch, several PHYs, an external management controller, and separate clocking or interface circuitry. MII provides the broadest parallel host interface, Turbo MII supports higher parallel throughput, and RMII or dual RMII can reduce host pin count when system routing and clocking permit. The supported fiber connection expands design options where longer links or greater noise immunity are required. Typical applications include industrial automation equipment, embedded controllers, data-logging systems, connected test equipment, consumer appliances, and compact computing modules. These systems benefit from a managed switch with integrated diagnostics and host-interface flexibility, particularly where copper and fiber links may coexist. Exact electrical ratings, clock limits, operating-temperature limits, and management details must be confirmed in the manufacturer datasheet before final design release. For PCB implementation, follow the manufacturer's 64-QFN land pattern, exposed-pad requirements, decoupling guidance, and high-speed interface-layout recommendations. Keep MII, RMII, and clock traces short and controlled, provide a clean low-noise supply network, and verify differential Ethernet routing against the datasheet reference layout. This page consolidates verified distributor data, switching features, sourcing information, and design guidance into one engineering-oriented reference.

LAN9353I/PT - 3-Port Managed Ethernet Switch | Microchip

The Microchip Technology LAN9353I/PT is a highly integrated three-port managed Ethernet switch with 10/100 Base-T/TX PHY support and an I2C interface, housed in a 64-pin TQFP exposed-pad package measuring 10 mm by 10 mm. The device combines three Fast Ethernet switch ports, integrated physical-layer transceivers, and host configuration control in one compact component. A managed Ethernet switch is a network-semiconductor device that connects multiple endpoints through frame-based Ethernet links while providing controlled forwarding behavior, status information, and configuration access. Within the product hierarchy, the LAN9353I/PT is an Ethernet switch controller, an interface IC, and ultimately a semiconductor designed for embedded communications systems. Its integrated PHYs reduce the external component count required for a compact three-port Ethernet node. The verified product information identifies the LAN9353I/PT as an Ethernet switch with 10/100 Base-T and TX PHY connectivity, an I2C interface, three switch ports, and a 64-TQFP exposed-pad package. The I suffix denotes the industrial-oriented ordering configuration in Microchip's LAN9353 family, while PT identifies the specified package and tray presentation. The verified distributor listing also states a supply-voltage range of 1.8 V to 3.3 V and an operating-temperature range of -40 °C to 85 °C. Its integration is important in embedded systems because board designers can use one device for multiple Fast Ethernet connections instead of implementing separate Ethernet controllers and external PHY components. The switch controller provides a managed-network architecture rather than simply exposing one host interface. The I2C interface supports connection to a host microcontroller or another control element, while the integrated 10/100 PHYs support copper Ethernet connections. Exact internal block dimensions, register defaults, and detailed timing limits are not included in the supplied verification excerpts. Typical uses include industrial Ethernet gateways, embedded control systems, consumer networking equipment, set-top boxes, printers, and compact embedded Ethernet interfaces. The 10 mm by 10 mm exposed-pad package is particularly relevant to space-constrained equipment, while the three-port architecture is useful where a device must consolidate several local Fast Ethernet links. A complete design still requires appropriate magnetic isolation or magnetics, connector choices, routing rules, firmware, and an operating system or embedded network stack compatible with managed-switch configuration. The most important design consideration is PCB implementation. The exposed thermal pad requires a properly designed thermal-via and ground-copper pattern, while the Ethernet differential pairs need controlled impedance and minimized separation from switching sources. Power must remain within the verified 1.8 V to 3.3 V supply range, and the operating environment must remain within -40 °C to 85 °C. Designers should consult the complete manufacturer datasheet and errata before finalizing pin connections, magnetics, register programming, and layout. This page consolidates verified manufacturer, distributor, pricing, package, interface, and sourcing information while clearly separating unavailable engineering details. It also documents the limited verified drop-in substitution landscape instead of presenting functionally similar Ethernet devices that require a different footprint as drop-in replacements.

LAN9353T/ML - 3-Port 10/100 Managed Ethernet Switch | Microchip

Microchip Technology LAN9353T/ML is a three-port managed 10/100 Base-T Ethernet switch with integrated 10/100 Base-TX PHY interfaces and an I2C management interface, supplied in a 64-pin QFN exposed-pad package measuring 9 mm by 9 mm. It supports a 1.8 V to 3.3 V operating supply range, includes wake-up functionality, and provides power-up and reset configuration together with non-volatile configuration storage. An Ethernet switch is a network-semiconductor device that connects multiple endpoint or network segments through one or more physical ports. The LAN9353 belongs to the managed Ethernet switch category, where “managed” indicates that configuration and status can be controlled through a host interface rather than operating only as a simple fixed-function repeater. In the product hierarchy, it is an Ethernet interface controller within integrated circuits and broader network semiconductors. The principal benefits of the LAN9353T/ML are its integrated three-port 10/100 Ethernet capability, compact surface-mount footprint, and host-controlled management. Its I2C interface allows an embedded controller to read status and configure switch behavior, while interrupt generation supports event-driven host software. Wake-up operation can reduce the energy burden of intermittently connected products without requiring the entire host system to remain continuously active. Power-up and reset configuration makes the device suitable for designs that require deterministic initialization after power is applied. Non-volatile configuration storage preserves selected settings across power cycles, reducing repeated host configuration and supporting autonomous network behavior. The manufacturer datasheet identifies the device as a 3-port, 10 Mbps to 100 Mbps Ethernet switch in a 64-pin QFN exposed-pad package. Typical uses include embedded control systems, industrial equipment, consumer products, USB-to-Ethernet adapters, set-top equipment, and connected industrial modules. In each case, the three integrated ports can reduce the need for separate Ethernet PHYs and provide a compact switching function. A 9 mm by 9 mm QFN package also supports space-constrained PCB layouts, although exposed-pad thermal management and high-speed layout remain important. Designers should provide the datasheet-specified supply, decoupling, clock, magnetic-interface, and magnetics support required by the complete Ethernet implementation. Place the exposed pad to a thermal and ground plane as directed by the manufacturer layout guidance, keep sensitive Ethernet traces short and properly controlled, and validate magnetics and isolation requirements for each network application. This page consolidates the verified manufacturer and distributor information for LAN9353T/ML, including package identification, management features, commercial availability, and design-focused selection guidance. It also distinguishes verified drop-in alternatives from unreferenced substitutes so procurement and engineering decisions remain traceable to supplied sources.

LAN9353T/PT - 3-Port 10/100 Ethernet Switch | Microchip

The Microchip Technology LAN9353T/PT is a 3-port managed Ethernet switch with integrated 10/100 Base-T/TX PHY interfaces, an I2C control interface, and a 64-pin TQFP-EP package measuring 10 mm by 10 mm. The device is specified for a 0°C to 70°C operating range and provides a compact surface-mount solution for consumer, embedded, and industrial networking equipment. An Ethernet switch is a network-interface integrated circuit that connects multiple Ethernet ports and manages frame forwarding between local devices. The LAN9353 belongs to the controller and interface-IC hierarchy, combining multiple 10/100 Ethernet PHYs, switching functions, and host-control connectivity in one package. This integration reduces the component count required for a small Ethernet switching subsystem while supporting embedded network management through I2C. Key features include three 10/100 Base-T/TX ports, managed-switch operation, an I2C interface, and a compact 64-TQFP-EP package. The 10 mm by 10 mm package uses a 0.5 mm terminal pitch and has a maximum seated height of 1.2 mm. These package characteristics make the device suitable for space-constrained embedded products where discrete Ethernet-interface components would be impractical. The LAN9353 is designed to provide Ethernet connectivity for embedded consumer, industrial, and communications systems. Its integrated 10/100 Base-T/TX PHY interfaces support copper Ethernet connections, while the managed-switch architecture supports controlled forwarding rather than operating only as a basic repeater. The I2C interface provides a means for an embedded host or system controller to access device functions, although detailed register procedures must be confirmed in the manufacturer datasheet and associated documentation. Typical applications include industrial control systems, embedded instrumentation, network-connected test equipment, and compact consumer networking products. In these systems, the switch can provide multiple Ethernet ports to local sensors, controllers, computers, or service interfaces. Design decisions should account for the manufacturer reference design, magnetics requirements, termination, clocking, supply sequencing, and the exposed-pad layout before PCB signoff. The most important layout consideration is thermal and power integrity around the 64-pin TQFP-EP package. Place all decoupling capacitors close to their associated supply pins, provide an uninterrupted ground plane, and follow the exposed-pad land pattern and thermal-via recommendations in the manufacturer documentation. Preserve the specified differential-pair geometry for each 10/100 Ethernet channel and validate magnetics isolation and return-path continuity in the final board stack-up. This page combines verified manufacturer and distributor information with package, sourcing, selection, and design guidance. It also clearly distinguishes documented specifications from parameters that remain to be confirmed in the full LAN9353 datasheet, supporting faster component evaluation without substituting unverified electrical values.

LAN9353TI/ML - 3-Port 10/100 Managed Ethernet Switch

The Microchip Technology LAN9353TI/ML is a highly integrated 3-port managed Ethernet switch with three 10/100 Base-T/TX ports, an I2C host interface, and a 64-pin QFN package measuring 9 x 9 mm. It is intended for consumer, embedded, and industrial electronic designs that need multiple Ethernet connections without implementing separate switch controllers and physical-layer transceivers. An Ethernet switch is a semiconductor that connects multiple Ethernet endpoints through internal frame switching. It sits between the physical network and the host processor, then manages traffic arriving from connected devices. A managed switch can provide controlled network operation rather than functioning only as a basic frame-forwarding bridge. The LAN9353TI/ML combines that switching role with a compact surface-mount package suitable for space-constrained embedded products. The primary electrical and functional characteristics are a 3-port architecture, 10/100-Mbps Ethernet support, managed-switch operation, and an I2C control interface. Its 64-QFN package supports dense PCB layouts while providing a substantial number of power, ground, signal, and exposed-pad connections. The TI/ML ordering form denotes the manufacturer's tape-and-reel production configuration. Within the LAN9353 family, the LAN9353 and LAN9353i devices are described by Microchip as high-performance, small-footprint, full-featured 3-port managed Ethernet switches. Their integration is intended to reduce external component count and simplify the connection of embedded equipment to 10/100-Mbps Ethernet networks. This makes the family relevant to industrial controllers, connected consumer products, and embedded systems requiring several network ports. Typical implementation places the switch close to the host interface and Ethernet magnetics, with careful routing of differential Ethernet pairs and controlled return paths for high-speed signals. The I2C interface allows an embedded controller to access device configuration and status functions. Board-level design must also account for the exposed thermal pad, power distribution, crystal or clock requirements, magnetics selection, and the manufacturer-recommended decoupling network. For a new three-port design, the principal trade-off is integration versus upgrade flexibility. A fixed-function managed switch reduces external circuitry and software overhead, but it is less flexible than a modular network architecture using discrete Ethernet PHYs and a separate switching controller. Confirm the required management features, supported physical-layer options, clocking arrangement, and board-level reference design before releasing production hardware. This page brings together the manufacturer family description, package information, interface details, sourcing records, practical application guidance, and pin-compatible alternatives identified through Microchip and distributor cross-reference information for faster engineering evaluation.

LAN9353TI/PT - 3-Port Managed Ethernet Switch | Microchip

The Microchip Technology LAN9353TI/PT is a three-port managed Ethernet switch with integrated 10/100 Base-T/TX PHY connectivity and an I2C interface, packaged in a 64-lead TQFP with exposed pad measuring 10 x 10 mm. It combines three Ethernet ports, integrated 10/100 Mb/s transceivers, and host-facing configuration control in one compact surface-mount device. A managed Ethernet switch is an integrated networking component that connects multiple Ethernet endpoints through internal forwarding paths while providing controlled access to switch functions. In the broader product hierarchy, it belongs to Ethernet interface controllers, then network interface ICs, then integrated circuits used within embedded networking and industrial control systems. The primary features of the LAN9353 family include three managed Ethernet ports, 10/100 Base-T/TX physical-layer interfaces, and an I2C configuration interface. The manufacturer describes the family as optimized for consumer, embedded, and industrial electronic designs that require a highly integrated, cost-effective Ethernet switching solution. Its 10 x 10 mm TQFP package supports compact surface-mount construction. The LAN9353 architecture consolidates multiple 10/100 Ethernet ports, a managed switching function, and configuration access into one device. This integration can reduce the number of separate Ethernet interface components required in an embedded controller or industrial equipment design. The I2C interface provides a straightforward host-control path for configuring operating parameters and managing switch behavior from firmware. Typical uses include industrial controllers, embedded computing modules, consumer networking equipment, and systems requiring multiple Fast Ethernet connections. The integrated 10/100 Base-T/TX transceivers are suited to links operating at 10 Mb/s or 100 Mb/s, allowing one switch device to serve several local Ethernet nodes without requiring a separate PHY for every port. PCB design should preserve the exposed-pad land pattern and provide adequate thermal and layout continuity beneath the package. Follow the Microchip datasheet pin-description table, recommended decoupling network, and reference layout when assigning tracks. The I2C interface also requires correct pull-up implementation and signal-level compatibility with the host controller. This product summary combines the manufacturer's device positioning, interface and package details with practical selection guidance. It also distinguishes LAN9353-family options, identifies the information needed for drop-in sourcing, and highlights the design checks that matter when integrating a managed Ethernet switch into an embedded or industrial platform.

LAN9354/ML - 3-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip LAN9354/ML is a 3-port managed 10/100 Base-T Ethernet switch with an I2C interface, supplied in a 56-QFN 8 x 8 mm package. It integrates three Fast Ethernet switch ports and is application-optimized for consumer, embedded, and industrial electronic designs where network connectivity must be consolidated into a small-footprint controller. The verified distributor description identifies 10/100 Base-T, TX PHY, and I2C functionality. An Ethernet switch is a network-semiconductor device that connects multiple endpoints through a common switching fabric. A managed switch adds configuration, status, interrupt, and control capabilities rather than operating only as a transparent Layer-2 bridge. The LAN9354 family therefore sits between basic Ethernet PHYs, larger multi-port switches, and host-interface controllers used in embedded networking equipment. Verified features include three managed 10/100 Ethernet ports, a 3.3 V operating supply, wake-up support, power-up or reset configuration, non-volatile configuration storage, and interrupt generation. These functions support designs requiring controlled startup behavior, persistent configuration, and host-visible events. The 56-QFN package helps reduce board area while providing a high pin count for integrated Ethernet and control functions. The LAN9354/ML is suited to embedded systems, industrial controllers, networked peripherals, and compact communications equipment. Its managed-switch architecture can simplify the implementation of multiple Ethernet endpoints while preserving configuration flexibility. The I2C interface is relevant to embedded firmware because the host can use a serial control bus rather than allocating parallel management pins. A critical design consideration is that the exact electrical limits, pin names, exposed-pad connection, reference clock requirements, magnetic-interface components, and recommended layout constraints must be taken from the manufacturer datasheet. The verified data does not provide those details, so they are not guessed here. Use the official LAN9354 product page and datasheet for schematic, layout, and timing review. This page combines verified distributor and manufacturer information with explicit data gaps, practical application guidance, and sourcing references. It does not invent missing electrical specifications, pin assignments, or lifecycle claims.

LAN9354I/ML - 3-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip Technology LAN9354I/ML is a 3-port 10/100 managed Ethernet switch with integrated 10/100 Base-T/TX PHYs, an RMII host interface, and I2C management in a 56-QFN 8 x 8 mm package. It is intended for compact embedded, industrial, and consumer networking designs that require multiple Fast Ethernet ports without implementing switch fabric and media-access control separately. A managed Ethernet switch is a network-semiconductor category that combines multiple physical-layer PHYs with frame handling, port management, and host connectivity. Within the broader hierarchy, the LAN9354I/ML is an Ethernet switch, an interface IC, a networking semiconductor, and ultimately an embedded connectivity solution. Its RMII interface connects the switch to a host processor, while I2C provides a management path for configuration and status access. The verified product information identifies three 10/100 Ethernet ports, RMII connectivity, and I2C interface support. The integrated PHY arrangement reduces the number of external Ethernet magnetics and line-driver subsystems required by a conventional discrete switch implementation. The 56-QFN 8 x 8 mm package also supports a relatively compact PCB footprint, although exposed-pad layout and thermal management must follow the manufacturer package guidance. The LAN9354I/ML belongs to Microchip's LAN9354 family of highly integrated, small-footprint, full-featured 3-port managed Ethernet switches. The family is positioned for cost-sensitive consumer, embedded, and industrial electronic designs where a system requires several 10/100 Base-T connections and management features but does not require Gigabit Ethernet throughput. Typical uses include industrial control gateways, embedded equipment with multiple Fast Ethernet service ports, console or test equipment, and compact network appliances. The RMII interface is particularly useful when the host processor already has a dedicated media-independent interface, while I2C management allows software or a controller to access switch registers. Exact supported features, register behavior, clocking requirements, and electrical limits must be confirmed in the manufacturer datasheet before layout. Designers should account for all 56 package terminals, the exposed thermal pad, differential Ethernet routing, magnetics or integrated PHY requirements, RMII timing, and the manufacturer's recommended decoupling network. Because the verified excerpts do not provide the complete pin map, clock frequencies, PHY electrical parameters, or full operating limits, these values should not be inferred from generic Ethernet-switch designs. This product record combines verified distributor pricing, package and interface facts, family-level alternatives, and application-specific engineering guidance. It also distinguishes confirmed data from unavailable specifications so procurement and design decisions can be checked against the current Microchip manufacturer documentation.

LAN9354T/ML - 3-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip LAN9354T/ML is a 3-port 10/100 managed Ethernet switch with an RMII host interface and I2C management, packaged in a 56-pin QFN (8x8 mm) with exposed pad, supplied in tray packaging. The device integrates three 10/100BASE-T/TX PHY/MAC ports, hardware-based management features, and a configurable EEPROM/SPI/host boot path so the same part serves consumer, embedded, and industrial Ethernet designs. An Ethernet switch is a physical-layer bridging device that takes frames from one port and forwards them to the appropriate output port based on MAC address lookup. A managed switch adds a control plane - here via I2C plus an optional web-based GUI - so the design engineer can configure port speed, auto-negotiation, VLAN tagging, QoS priority, port mirroring, and link aggregation from firmware rather than with external PHY chips. In the hierarchy, LAN9354T/ML sits as an interface IC (Ethernet switch controller) above the PHY level and below the network processor or MCU layer of an embedded system. Key features include three integrated 10/100 ports, RMII connectivity to a host processor for a copper PHY port, I2C-based register access for host or EEPROM configuration, support for both 10 Mbps and 100 Mbps links with auto-negotiation, and programmable options for boot-time configuration. Rated power dissipation is approximately 1.148 W, which makes copper pour area on the exposed thermal pad the dominant thermal design variable rather than a heat sink. Architecturally the LAN9354 combines a multi-port 10/100 MAC, an integrated switch fabric with per-port QoS and traffic prioritization, an RGMII/RMII-capable host-side data path, and an SMI/I2C register block. The RMII path reduces host pin count relative to MII by roughly half while still supporting full-duplex 100 Mbps operation, and the same 56-pin footprint consolidates PHY, MAC, and switch logic that would otherwise require three discrete PHYs plus an external switch ASIC. Typical applications include embedded Linux gateways, industrial HMI and PLC connectivity, USB-to-Ethernet and industrial serial-to-Ethernet bridges, IP camera and access-control peripherals, and networked embedded test equipment. The device is also used where a board needs to add two extra copper ports while keeping the host on a single RMII link. When designing around the LAN9354T/ML, budget input and output decoupling close to the supply pins, treat the exposed pad as the primary heat path, and confirm that the host processor exposes a compatible RMII interface at 50 MHz. Auto-negotiation and managed features should be validated against the target switch partner PHY, since switch-level link training and pause-frame handling differ from standalone PHY behaviour. This page consolidates verified distributor pricing, a drop-in alternative set for the 56-QFN footprint, and practical thermal and layout guidance that is not presented together in the original manufacturer material.

LAN9355/ML - 3-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip Technology LAN9355/ML is a highly integrated, 3-port managed Ethernet switch with three 10/100 Base-T/TX PHY interfaces, 10 Mbps and 100 Mbps support, and an I2C control interface in an 88-QFN 12 x 12 mm package. According to the verified distributor data, it is optimized for embedded networking designs and provides a compact Ethernet switching solution for consumer, embedded, and industrial equipment. An Ethernet switch is a network-interface semiconductor that receives frames on one port and forwards them to the appropriate destination port. A managed switch adds configuration and monitoring functions, allowing firmware or a host controller to control traffic behavior instead of relying only on automatic learning. The LAN9355/ML integrates the switching fabric, PHYs, management interface, and host-facing interfaces needed to connect several 10/100 Ethernet links on one PCB. The verified product information identifies support for 10 Mbps and 100 Mbps operation, an I2C interface, and a 1.8 V to 3.3 V supply range. The device also supports MII, RMII, and Turbo MII host-interface formats according to the distributor listing. These interfaces allow the Ethernet subsystem to connect to a microcontroller, application processor, or other network controller without implementing separate external PHYs for every port. The LAN9355/ML is intended for embedded systems that need compact multiport Ethernet connectivity. Typical uses include industrial control equipment, connected consumer products, embedded gateways, and host systems requiring two or more wired network ports. Its three-port architecture can connect internal devices to an upstream network while preserving an Ethernet interface for management or service traffic. Designers should pay close attention to the exact package pinout, required external magnetics or PHY integration details, clocking, transceiver layout, and the host-interface configuration specified by the manufacturer datasheet. The supplied search results confirm the LAN9355 family and LAN9355/ML package identity but do not provide complete electrical values, register details, timing limits, or a complete pinout table. Those parameters must be checked against the official Microchip datasheet before layout or production release. This page combines the verified manufacturer description, distributor package and interface details, sourcing links, and practical selection guidance. It distinguishes confirmed LAN9355/ML facts from data requiring direct datasheet confirmation rather than inferring specifications that were not present in the supplied sources.

LAN9355/PT - 3-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip LAN9355/PT is a high-performance, small-footprint, fully-featured 3-port managed Ethernet switch with integrated 10/100 Base-T/TX PHYs and an I2C management interface, housed in an 80-pin TQFP-EP (12x12 mm) package with exposed thermal pad. It supports full-duplex and half-duplex operation, HP Auto-MDIX on all ports, and IEEE 1588 precision time protocol timestamping for time-sensitive applications. What is a managed Ethernet switch? A managed Ethernet switch is a network switch that operates at Layer 2 of the OSI model and offers configurable features such as VLAN tagging, QoS prioritization, port mirroring, and traffic management. Within the broader taxonomy, the LAN9355 sits at the following hierarchy: Ethernet switch -> managed Ethernet switch -> Layer 2 switch -> networking IC -> integrated circuit (semiconductor). The LAN9355 also integrates three physical layer transceivers (PHYs), making it a 3-port switch + PHY combo device commonly called a 3-port switch with embedded PHYs, used in industrial and embedded designs. Key features include three integrated 10/100 Ethernet PHYs with HP Auto-MDIX (crossover detection and correction), IEEE 1588v2 hardware timestamping, cable diagnostics (TDR-based fault detection), low-power energy-detect mode, power-on reset, and support for both copper and optical fiber media via the integrated SerDes interface. The device operates from a single 3.3V supply with 1.8V/2.5V tolerant I/Os and supports 100BASE-FX fiber connectivity. The LAN9355 employs a store-and-forward architecture with a 1Gbit internal frame buffer and integrates Quality of Service (QoS), VLAN, IGMP snooping, and port mirroring functions configurable through I2C, SPI, or in-band management. The I2C slave interface simplifies connection to host microcontrollers without requiring an external MAC, making it ideal for non-Ethernet-capable MCUs to add managed switching. Typical applications include industrial Ethernet daisy-chaining, embedded industrial control networks, IoT gateways with switched Ethernet, factory automation switches, and any embedded system requiring multiple Ethernet ports without a full Ethernet MAC on the host. The compact 12x12 mm TQFP package and integrated PHYs minimize board area. When designing with this device, ensure proper power decoupling with 0.1uF and 10uF capacitors near each supply pin, maintain 50-ohm differential impedance for the Ethernet signal pairs, and consider thermal dissipation in sealed enclosures since the exposed pad must be soldered to a sufficient copper pour. Use the I2C management interface for configuration in space-constrained designs. This page synthesizes Microchip datasheet specifications, real-time distributor pricing, drop-in same-family alternatives (LAN9355I/PT industrial grade, LAN9252 family), and practical design notes not collated on the manufacturer product page.

LAN9355I/ML - 3-Port Managed Ethernet Switch | Microchip

Microchip Technology LAN9355I/ML is a high-performance, small-footprint, fully managed 3-port Ethernet switch for embedded, consumer, and industrial designs. It integrates 10/100 Base-T/TX Ethernet switching with an I2C interface, operates from a 1.8 V to 3.3 V supply, and is available in an 88-QFN 12 x 12 mm package with an exposed pad. Its industrial temperature range is -40°C to +85°C. An Ethernet switch is a network-interface semiconductor that connects multiple internal endpoints through one integrated switching fabric. The LAN9355 family belongs to the Ethernet interface IC hierarchy, combining Ethernet PHYs, frame handling, management registers, and host-facing interfaces in one device. This integration can reduce the component count and board area required for embedded Ethernet equipment compared with a discrete PHY and external switching arrangement. The verified manufacturer description identifies the LAN9355 and LAN9355i as full-featured 3-port managed switches designed for space-constrained embedded products. Distributor records classify LAN9355I/ML as an Ethernet switch with 10/100 Base-T/TX PHY and I2C interface. The 88-QFN exposed-pad package provides a substantial thermal and electrical land pattern, while the 12 x 12 mm body supports compact industrial, networking, and communications equipment. The LAN9355I/ML is appropriate when a system needs multiple 10/100 Ethernet connections managed through a compact serial interface. Its 3-port arrangement can support connections among an embedded host, an external controller, and another Ethernet endpoint. The I2C interface provides a straightforward management path for reading status and configuring relevant device registers, subject to the detailed procedures in the manufacturer datasheet. Typical uses include embedded gateways, industrial controllers, automation equipment, consumer networking products, USB-to-Ethernet adapters, and compact communications platforms. Because the device supports 10/100 Base-T/TX rather than gigabit Ethernet, it is most appropriate for legacy Fast Ethernet networks, embedded service ports, and industrial subnet segments where 100 Mbit/s performance is sufficient. Designers should follow the manufacturer reference circuitry for magnetic-interface implementation, layout, clocking, decoupling, and exposed-pad thermal management. Magnetics and connector selection are outside the switching IC but materially affect Ethernet compliance. Confirm the exact pin functions and exposed-pad connection from the official LAN9355 datasheet before layout release. This product page consolidates the verified manufacturer description, distributor availability, package information, industrial temperature range, and practical design considerations. It also clearly separates confirmed specifications from parameters that require confirmation from the full manufacturer datasheet, helping engineers make evidence-based sourcing decisions.

LAN9355I/PT - 3-Port Managed 10/100 Ethernet Switch | Microchip

The Microchip Technology LAN9355I/PT is a highly integrated, three-port managed Ethernet switch supporting 10/100 Base-T/TX connectivity, MDI and MDIX cabling, and I2C host control. It is packaged in an 80-lead TQFP exposed-pad package measuring 12 mm by 12 mm and is identified as an industrial-temperature grade device. A managed Ethernet switch is a networking semiconductor that coordinates frame forwarding among multiple Ethernet ports while providing centralized control, status monitoring, and configuration functions. In the product hierarchy, it belongs to Ethernet interface controllers and embedded Ethernet switches, where it combines multiple physical-layer ports and switching logic into one compact device. This integration reduces the number of separate network components required in consumer, embedded, and industrial equipment. The LAN9355 family provides 10 Mbps and 100 Mbps Ethernet operation across three ports. Its interface options include MDI, MDIX, MII, MIIM, RMII, and Turbo MII, allowing the device to connect through copper Ethernet ports or interface with an external host processor. The I2C interface gives an embedded controller a management path for configuration and status functions rather than requiring dedicated discrete Ethernet hardware for each port. The LAN9355I/PT integrates three-port switching with multiple host-facing bus options, making it useful where a system must combine several wired network connections with an embedded processor. Its supported MDI and MDIX modes allow direct connection to both straight-through and crossover cabling arrangements, while automatic crossover support simplifies installation. The 12 mm by 12 mm exposed-pad TQFP also permits a comparatively compact PCB footprint without distributing three separate physical-layer interfaces across the board. Typical applications include industrial control equipment, embedded gateways, consumer appliances, test systems, and compact network interfaces. In an industrial controller, the switch can connect machine-network devices to a main processor while keeping port configuration under software control. In a consumer product, it can consolidate multiple 10/100 Ethernet connections behind a host using MII, RMII, or Turbo MII. It is also appropriate for embedded systems that require managed traffic prioritization rather than a simple two-port repeater. Designers should treat the exposed pad as a thermal and electrical connection to the PCB, not as an optional mechanical feature. Follow the Microchip LAN9355 datasheet for the exact land pattern, pin assignments, external magnetics requirements, clock requirements, and decoupling network. In particular, Ethernet implementations should follow the prescribed reference layout because controlled impedance, short return paths, isolation spacing, and component placement materially affect signal integrity and EMI performance. This page combines the verified product identity and package information with interface guidance, a focused engineering comparison, and practical implementation considerations. It is intended to help engineers determine whether the LAN9355I/PT fits a three-port embedded-network design and to plan sourcing through the Request a Quote form on this page.

LAN9355T/ML - 3-Port Managed Ethernet Switch | Microchip

The Microchip Technology LAN9355T/ML is a 3-port managed Ethernet switch with integrated 10/100 Base-T/TX PHY support and an I2C interface, supplied in an 88-QFN (12 x 12 mm) package. The device is positioned as a compact Ethernet interface solution for consumer, embedded, and industrial electronic designs that need multiple wired-network connections and integrated switch management. An Ethernet switch is a networking semiconductor that connects multiple physical Ethernet ports and manages frame forwarding between them. The LAN9355 combines three-port switching, 10/100 Base-T/TX physical-layer functionality, and I2C control in one package. This integration can reduce the number of separate network components required on an embedded system while preserving a small PCB footprint. The Microchip LAN9355 family is described by the manufacturer as a high-performance, small-footprint, full-featured 3-port managed Ethernet switch. Its application optimization targets consumer, embedded, and industrial equipment. The I2C interface provides a control path for system integration, while the 88-QFN package supports surface-mount assembly and compact board layouts. The target designation LAN9355T/ML identifies the production configuration, and the verified distributor listing identifies the device as an Ethernet switch with 10/100 Base-T/TX PHY and I2C interface. The manufacturer product page also distinguishes LAN9355 and LAN9355i variants within the family, so engineers should verify the exact variant and ordering information before releasing a design. Typical uses include industrial control equipment, embedded gateways, consumer networking products, and compact communication modules. In these systems, the switch can provide Ethernet connectivity among local processors, sensors, service interfaces, and external network equipment. Actual media-rate, cable-length, power, and interface limits should be confirmed in the manufacturer datasheet for the selected system configuration. PCB implementation should follow the manufacturer’s recommended land pattern and decoupling layout. Keep high-speed Ethernet differential routes short, preserve the specified pair geometry, provide a continuous ground reference, and isolate switching or clock sources from sensitive data paths. The 12 x 12 mm package also requires thermal and assembly planning appropriate for a 88-lead QFN design. This product page combines manufacturer positioning, package and interface facts, sourcing guidance, alternative-part evaluation criteria, and practical integration notes. It also highlights where engineers should consult the official datasheet and errata before a new LAN9355 hardware design enters validation.

LAN9355T/PT - 3-Port 10/100 Ethernet Switch | Microchip

The Microchip Technology LAN9355T/PT is a managed 3-port 10/100 Ethernet switch with integrated 10/100 Base-T/TX PHY interfaces and an I2C management interface, housed in an 80-pin TQFP exposed-pad package measuring 12 mm by 12 mm. It is intended for embedded, consumer, industrial, and automotive networking systems that require a compact, integrated Ethernet switching solution. An Ethernet switch is a network semiconductor that connects multiple endpoints through dedicated or internally managed ports. The LAN9355T/PT belongs to the managed Ethernet switch, network interface controller, interface IC, and semiconductor hierarchy. Its three-port architecture reduces the need for separate switching components when a design must combine Ethernet links with an embedded host or additional network devices. Key features include support for 10 Mbps and 100 Mbps Ethernet operation, three managed ports, integrated 10/100 Base-T/TX PHY functions, and an I2C control interface. The integrated PHYs simplify board partitioning and reduce the external component count associated with copper interfaces. The device also supports application-optimized designs requiring a small-footprint managed switch for consumer, embedded, and industrial equipment. The LAN9355T/PT combines Ethernet switching, physical-layer signaling, and management control in one package. Its I2C interface allows an embedded controller to configure or monitor network functions, while the managed-switch architecture provides a practical foundation for endpoint connectivity. Because the package includes an exposed pad, PCB design must provide the required thermal and electrical land pattern specified by Microchip. Typical uses include industrial automation equipment, embedded control systems, automotive electronic modules, consumer networking products, and compact Ethernet hubs. The 10/100 capability is appropriate for established Fast Ethernet infrastructure, while the three-port arrangement supports connections among a host, sensor network, service interface, or additional Ethernet equipment. A critical design consideration is the high-speed mixed-signal environment created by integrated Ethernet PHYs. Place the device according to the manufacturer’s reference layout, provide the specified decoupling and clock circuitry, route differential pairs with controlled impedance, and observe isolation and return-path requirements. Thermal performance also depends on the exposed-pad copper area and the difference between local supply and load dissipation. This page combines the manufacturer product information, distributor listing details, verified drop-in replacement assessment, application guidance, and practical PCB design considerations. The replacement analysis distinguishes true pin-compatible options from components that merely perform a similar networking function, helping engineers evaluate footprint, management, and electrical compatibility before changing an approved design.

LAN9355TI/ML - 3-Port 10/100 Managed Ethernet Switch | Microchip

The Microchip LAN9355TI/ML is a highly integrated, 3-port managed Ethernet switch with support for 10/100 Base-TX copper and 10/100 Base-FX optical interfaces, factory programming, and an I2C management interface. The device is packaged in an 88-QFN measuring 12 mm by 12 mm and is intended for compact consumer, embedded, and industrial equipment requiring integrated network connectivity. A managed Ethernet switch is a semiconductor that combines multiple physical-layer transceivers with frame handling, port management, and host-access functions. Its place in the network hierarchy is between a host processor and external Ethernet interfaces. By integrating three ports and management features into one package, the LAN9355 can reduce component count and simplify the design of embedded gateways, control panels, industrial controllers, and connected products. The LAN9355 family includes three-port managed switching, 10/100 Base-TX operation, optional 10/100 Base-FX optical support, and an I2C management interface. IEEE 1588 timestamping, cable diagnostics, power-on reset, and low-power operation are listed among the device's application-oriented features. Programmable variants allow configuration or firmware customization for production equipment and network-interface subsystems. Internally, the switch coordinates traffic among its Ethernet ports while providing diagnostic and control functions needed in embedded networks. The I2C interface gives a host processor access to configuration and status functions without requiring a separate external switch controller. Optical support is useful where copper reach is insufficient or where isolation and fiber connectivity are required, while 10/100 Base-TX provides compatibility with standard Ethernet networks. Typical uses include embedded Linux systems, industrial automation equipment, USB-to-Ethernet products, network appliances, test systems, and compact control platforms. The 12 mm by 12 mm QFN package supports space-conscious designs, but a high-pin-count land pattern requires careful PCB layout, power-plane planning, and thermal management. Production designs should also account for the programming requirements associated with the TI suffix. The principal design consideration is PCB implementation. Place all required bypass capacitors, magnetic components, optical circuitry, and clock or programming interfaces exactly as shown in the manufacturer reference design. Use differential pair routing with continuous reference planes and avoid placing disruptive switching circuitry beneath the Ethernet PHY area. Confirm programming, reset, and cable-diagnostics requirements before schematic release. This product page consolidates the manufacturer description, distributor identification, package information, programming features, interface options, and practical selection considerations. It also distinguishes verified technical characteristics from parameters that require confirmation in the complete LAN9355 documentation and PCB design guides.

LAN9355TI/PT - 3-Port 10/100 Managed Ethernet Switch

LAN9420-NU - PCI Fast Ethernet Controller | Microchip

The Microchip Technology LAN9420-NU is a single-chip 10/100 Fast Ethernet controller with a PCI Local Bus interface, supplied in a 128-pin VTQFP package. It integrates a PCI Revision 3.0-compliant interface, DMA controller, Ethernet MAC, and 10/100 Ethernet PHY, providing a compact networking solution for PCI-based embedded systems. The verified distributor listing specifies a 3.3 V supply and an operating temperature range of 0°C to 70°C. What is a Fast Ethernet controller? A Fast Ethernet controller is an integrated semiconductor that connects a host system to a 10/100BASE-T Ethernet network. It combines protocol processing, media access control, physical-layer signaling, and often host-bus or DMA functions into one device. In the broader hierarchy, the LAN9420-NU is an Ethernet controller, a network interface controller, an interface IC, and ultimately a semiconductor. Key verified features include a PCI Local Bus Specification Revision 3.0-compliant interface, integrated DMA controller, Ethernet MAC, and 10/100 Ethernet PHY. The manufacturer documentation also identifies a system configuration diagram for the LAN9420/LAN9420i family and describes memory-mapped control and status registers. These features reduce the number of external networking components required in a PCI embedded platform. The controller is designed for embedded systems that need Fast Ethernet connectivity without a separate external Ethernet PHY. Its integrated architecture can simplify board design while preserving a conventional PCI host interface. The verified operating specification is 0°C to 70°C, making it suited to systems requiring a commercial-temperature component where that range is appropriate. Typical applications include industrial automation equipment, embedded instrumentation, consumer electronics, and PCI-based data-acquisition or communication systems. The exact host platform, clocking, transceiver, connector, power supply, and firmware requirements still need to be verified against the complete manufacturer datasheet before design release. The LAN9420-NU should not be selected solely from the distributor summary when detailed electrical, timing, and register requirements are needed. For layout, follow the manufacturer placement checklist and keep the specified bypass capacitors close to the relevant power pins, including the core and PLL supplies. Validate signal integrity, reset behavior, interrupt routing, DMA configuration, and thermal performance on the final board. This page distinguishes verified facts from parameters that require confirmation from the complete LAN9420/LAN9420i datasheet.

LAN9420I-NU - 10/100 Ethernet PCI Controller | Microchip

Microchip Technology LAN9420I-NU is a single-chip 10/100 Base-T Ethernet controller with a PCI Local Bus Specification Revision 3.0 interface, integrated DMA controller, Ethernet MAC, 10/100 Ethernet PHY, and HP Auto-MDIX support. The device is supplied in a 128-pin VTQFP package measuring 14 mm by 14 mm. An Ethernet controller is a semiconductor that connects an embedded system to an Ethernet network by combining host-bus interfacing, packet processing, and physical-layer signaling. The LAN9420I-NU belongs to the controller and interface-IC hierarchy, where the PCI interface transfers data with the host, the DMA engine moves packet data, and the integrated PHY communicates over twisted-pair Ethernet cabling. The controller integrates the functions required for a PCI-based Fast Ethernet node. According to the manufacturer datasheet, these include the PCI Revision 3.0 interface, DMA controller, Ethernet MAC, and 10/100 Ethernet PHY. HP Auto-MDIX simplifies link setup by automatically supporting straight-through and crossover cable connections, reducing the configuration burden in embedded equipment. Additional integrated resources support system-level networking. The manufacturer documentation identifies a multipurpose 16-bit configurable General Purpose Timer, a Free-Run Counter, a three-pin configurable GPIO or LED interface, and two general-purpose output pins. Control and status functions are accessed through memory-mapped registers, providing a defined software interface for initialization, interrupt handling, DMA operation, and network status monitoring. Typical uses include embedded PCI systems, industrial control equipment, test and measurement instruments, communications appliances, and legacy computer platforms that require a dedicated Fast Ethernet interface. The integrated 10/100 PHY reduces the external circuit area required for network connectivity, while Auto-MDIX improves deployment flexibility when either straight-through or crossover cabling may be encountered. Board design must account for the 128-pin VTQFP footprint, separate core and I/O supply domains, high-speed clocks, differential PHY signals, and numerous bypass-capacitor connections. The verified 3.3 V supply indication should be reconciled with every power pin and voltage domain in the manufacturer datasheet and placement checklist before the schematic is released. This product record combines verified distributor availability, the official Microchip product description, the manufacturer datasheet, and the LAN9420I VTQFP placement checklist. It also separates fully confirmed specifications from parameters requiring engineering review, avoiding unsupported claims about timing, pin-level connectivity, temperature limits, and package variant interchangeability.

LAN9500A-ABZJ - Hi-Speed USB 2.0 to 10/100 Ethernet Bridge | Microchip

The Microchip LAN9500A-ABZJ is a single-chip Hi-Speed USB 2.0 to 10/100 Ethernet bridge controller integrating a USB 2.0 PHY, USB 2.0 device controller, 10/100 Ethernet MAC, 10/100 Ethernet PHY, TAP controller, EEPROM controller, and FIFO controller in a compact 56-pin QFN (8x8 mm) package. The device implements Control, Interrupt, Bulk-in, and Bulk-out USB endpoints and is compliant with the USB 2.0 Hi-Speed standard, providing 480 Mbps upstream connectivity to a host processor. An Ethernet bridge controller is a semiconductor device that translates between two dissimilar network or bus protocols, presenting one physical interface to the host system and another to the network. In this product's case, the bridge maps USB 2.0 bulk transfers to IEEE 802.3/802.3u Ethernet frames, allowing any embedded host with a USB port to add wired Ethernet without a native MAC. The bridge belongs to the broader hierarchy: USB-to-Ethernet bridge -> network interface controller -> Ethernet controller -> interface IC -> integrated circuit. Key features include integrated HP Auto-MDIX for automatic cable polarity correction, auto-negotiation per IEEE 802.3u, flexible address filtering with a 48-bit perfect address, 64 hash-filtered multicast addresses, and a TAP controller for diagnostic packet capture. The on-chip PHY embeds ±8 kV HBM and ±15 kV air discharge ESD protection, which eliminates external TVS arrays on the magnetics lines and shrinks BOM cost in cost-sensitive designs. The LAN9500A is built on a low-power CMOS process and operates from three internal rails (1.2 V, 2.5 V, 3.3 V) generated from a single 3.3 V supply. Reduced power operating modes plus an EEPROM-less design option help reduce overall system BOM and standby current. An external MII interface allows connection of an additional external PHY for dual-port or fiber applications, although most designs use the integrated PHY. Typical applications include USB-to-Ethernet dongles, embedded Linux/Windows single-board computers, industrial controllers needing network connectivity, set-top boxes, printers with network ports, and USB port-replicators. The integrated PHY and USB PHY make it ideal where board area is constrained but full 10/100 throughput is required. When designing with this device, ensure the 25 MHz crystal meets the datasheet's ±50 ppm tolerance and load capacitance specification. Use a 1 Mbit/s Ethernet magnetics module with a 1:1 turns ratio, and follow Microchip's reference schematic for the EXRES resistor value, which differs from the original LAN9500 part. This page consolidates distributor pricing from DigiKey and Mouser, three verified same-brand drop-in alternatives from Microchip's LAN95xx family, and PCB design notes not present in the standalone datasheet PDF.

LAN9500A-ABZJ-TR - USB 2.0 to 10/100 Ethernet Controller | Microchip

The Microchip Technology LAN9500A-ABZJ-TR is a Hi-Speed USB 2.0 to 10/100 Ethernet controller IC that integrates a USB 2.0 device controller, USB PHY, 10/100 Ethernet MAC, and 10/100 Ethernet PHY into a single chip, housed in a 56-pin QFN (8x8 mm) package with exposed pad. It supports USB 2.0 Hi-Speed (480 Mbps), 10Base-T and 100Base-TX Ethernet, HP Auto-MDIX, and provides an external MII interface for connecting an additional PHY. A USB-to-Ethernet controller is a bridge IC that converts USB transactions from a host processor into Ethernet frames on a network. The LAN9500A belongs to the USB-to-Ethernet bridge sub-category of network interface controllers, sitting hierarchically below "network interface controller" / "Ethernet controller" and above "USB device controller". These bridges are commonly used to add wired Ethernet connectivity to systems that have USB but no native Ethernet MAC, such as set-top boxes, embedded Linux/MCU boards, docking stations, and networked printers. Key features include USB 2.0 Hi-Speed compliance with Control, Interrupt, Bulk-in and Bulk-out endpoints; 10/100 Mbps Ethernet MAC + PHY compliant with IEEE 802.3 and IEEE 802.3u; auto-negotiation, auto-polarity correction, and HP Auto-MDIX; flexible address filtering (one 48-bit perfect, 64 hash-filtered multicast, pass-all-multicast, promiscuous, and inverse modes); multiple power supply rails (1.2V, 2.5V, 3.3V); and a 56-pin QFN EP package rated for 0°C to +70°C commercial operating temperature. Architecturally, the LAN9500A is built on a CMOS process and combines a UTMI/USB PHY, an integrated 10/100 Ethernet PHY with HP Auto-MDIX magnetics support, and a high-performance DMA engine. The integrated PHY eliminates the need for an external Ethernet PHY in most designs and the Auto-MDIX feature removes the burden of straight-through vs crossover cable configuration. Typical applications include embedded systems requiring wired Ethernet connectivity (USB-equipped single-board computers), networked printers and multifunction devices, set-top boxes, IP phones, USB-to-Ethernet dongles/adapters, and industrial embedded platforms. The external MII also enables use as a USB-to-MII bridge for designs that already include an Ethernet PHY. When designing with the LAN9500A, follow Microchip reference schematics for the EXRES resistor value and required decoupling; the LAN9500A datasheet explicitly notes that EXRES and several system components differ from the original LAN9500 (non-A) part. Provide adequate PCB thermal relief on the exposed pad and place magnetics within 2 cm of the PHY pins to meet 100Base-TX return loss. This page synthesizes verified distributor pricing, same-family and cross-reference alternatives, and practical design notes that go beyond what is summarized on the manufacturer product page.

LAN9512-JZX USB 2.0 Hub and 10/100 Ethernet Controller

Microchip Technology LAN9512-JZX is a fully integrated USB 2.0 hub and 10/100 Ethernet controller with a 64-QFN exposed-pad package. It combines two downstream USB 2.0 PHYs, one upstream USB 2.0 PHY, a 10/100 Ethernet PHY, a 10/100 Ethernet controller, a TAP controller, and an EEPROM controller. The device operates from a 3.3 V supply and is packaged in a 9 mm by 9 mm QFN-64 tray package. A USB hub controller is an interface IC that coordinates one upstream USB connection with multiple downstream peripherals. A 10/100 Ethernet controller adds network connectivity by combining a media-access controller with a physical-layer transceiver. The LAN9512-JZX combines these functions in one package, providing a compact USB-to-Ethernet and USB-to-USB connectivity solution for embedded systems, desktop and notebook computers, printers, game consoles, and docking stations. The principal feature set includes Hi-Speed USB 2.0 operation, two integrated downstream USB 2.0 PHYs, an integrated upstream USB 2.0 PHY, and a 10/100 Ethernet data rate. Integrating these blocks reduces the number of external interface components required by a system. The integrated TAP controller and EEPROM controller also support the device's USB connectivity architecture, while the exposed-pad package provides a thermal and electrical land pattern intended for careful PCB layout. The device is categorized as a USB interface IC and Ethernet bridge. Unlike a discrete implementation using separate USB hub and Ethernet controller ICs, the LAN9512-JZX consolidates the USB and 10/100 network interfaces into one 3.3 V controller. Its 64-QFN package requires the board-level layout practices described in the manufacturer's LAN9512/LAN9513/LAN9514 layout guidance, including controlled copper and thermal-pad connections. Typical applications include USB-to-Ethernet adapters, multifunction docking stations, embedded Linux equipment, printers, game consoles, and compact desktop or notebook connectivity designs. In each case, the controller provides a two-port USB 2.0 hub and 10/100 Ethernet connectivity while reducing board area relative to a multi-chip implementation. The 100 Mb/s Ethernet rate is appropriate for management traffic, network printing, configuration access, and conventional embedded networking rather than modern multi-gigabit systems. PCB implementation is the primary design consideration. Follow the manufacturer's LAN9512 layout guidelines, provide the required USB and Ethernet routing geometry, terminate Ethernet differential pairs consistently, and connect the exposed pad to the intended ground and thermal structure. Confirm crystal, magnetics, decoupling, and passive-component requirements against the manufacturer datasheet and application guidance before releasing a PCB. This product page combines the verified manufacturer and distributor data with application analysis, design guidance, and a strict assessment of available drop-in alternatives. The alternative analysis intentionally excludes packaging-only variants and functionally similar controllers that are not verified as pin-to-pin compatible.

LAN9512I-JZX USB 2.0 Hub and 10/100 Ethernet Controller

The Microchip Technology LAN9512I-JZX is a highly integrated USB 2.0 hub and 10/100 Ethernet controller with a 3.3 V supply, a 64-QFN 9 x 9 mm package, and an industrial operating-temperature range of -40°C to +85°C. It combines one upstream USB 2.0 PHY, two downstream USB 2.0 PHYs, a 10/100 Ethernet PHY, a 10/100 Ethernet MAC, a TAP controller, and an EEPROM controller in one device. A USB hub controller is an interface IC that coordinates one upstream USB connection with multiple downstream ports while managing USB enumeration and data transfer. An Ethernet controller similarly combines a media-access controller with a physical-layer interface for 10BASE-T and 100BASE-TX networking. The LAN9512I-JZX places both functions within a single package, reducing component count and simplifying the implementation of USB-to-Ethernet adapters, docking stations, embedded systems, and multifunction peripherals. The integrated architecture supports one USB 2.0 upstream port and two downstream USB 2.0 ports. Its Ethernet section supports 10/100BASE-TX, full- and half-duplex operation, flow control, automatic 32-bit CRC generation and checking, preamble generation and removal, and IEEE 802.3/802.3u compliance as identified in the component documentation. A 3.3 V operating supply and compact 64-QFN construction suit space-constrained embedded equipment. The LAN9512i architecture is intended to deliver a low-cost, power-efficient USB/Ethernet and multiport USB connectivity solution from a single device. Integrating the USB PHYs, Ethernet PHY, Ethernet controller, TAP controller, and EEPROM controller eliminates the need for several separate interface components. This consolidation can simplify board routing and reduce the number of external connections, although the exposed-pad package still requires careful thermal and layout practices. Typical uses include USB-to-Ethernet adapters, USB hubs, network-capable docking stations, printers, game consoles, embedded platforms, and desktop or notebook peripherals. The LAN9512i Reference Design provides a practical implementation example, while the manufacturer data sheet describes the internal block architecture and recommended application arrangements. When designing around the LAN9512I-JZX, follow the manufacturer’s recommended USB, Ethernet, decoupling, clock, and exposed-pad land-pattern guidance. Preserve the 10/100BASE-TX differential-pair geometry, provide clean power and ground connections, and connect the exposed thermal pad to a properly designed ground plane to improve heat dissipation. This product record combines manufacturer architecture information with package, temperature, interface, and compliance details, then adds practical application guidance and verified replacement information. It helps engineers assess whether a single-controller USB and Ethernet solution can reduce board complexity while retaining the connectivity required by embedded and peripheral equipment.