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LAN9252I/PT - 2/3-Port EtherCAT Controller | Microchip
The Microchip LAN9252I/PT is a 2/3-port EtherCAT slave controller with dual integrated 10/100 Ethernet PHYs, 100BASE-TX operation, and a 64-pin TQFP exposed-pad package. It supports a synchronous device SPI/SQI host interface, HP Auto-MDIX, digital I/O mode, and an external fiber transceiver for 100BASE-FX. The controller includes 4K bytes of dual-port memory and three Fieldbus Memory Management Units for EtherCAT communication. An EtherCAT slave controller, or ESC, is a semiconductor that connects an embedded controller or industrial I/O module to an EtherCAT segment. The ESC processes EtherCAT frames, manages distributed clocks, provides dual-port memory for the host application, and controls network ports through integrated Ethernet PHYs. The LAN9252I/PT therefore combines an EtherCAT communication engine, two 100Mbps Ethernet physical layers, and host-side control in one device. The LAN9252 family supports full-duplex 100BASE-TX on both integrated Ethernet ports and HP Auto-MDIX, allowing direct-connect or crossover Ethernet cables. The SPI/SQI interface connects the ESC to an MCU or embedded processor, while digital I/O mode lets EtherCAT-master-controlled signals be monitored or driven through the device. The external-transceiver path also supports 100BASE-FX when fiber connectivity is required. The 64-TQFP-EP package provides a 10 mm by 10 mm land pattern with an exposed thermal pad. The /PT ordering suffix identifies the tray package option, while the I variant identifies the industrial temperature grade. Designers should confirm the exact electrical limits, pin names, timing values, recommended magnetics, and decoupling values against the manufacturer datasheet before releasing a PCB layout. Typical applications include distributed I/O modules, servo and motion-control nodes, PLC interfaces, industrial Ethernet gateways, robot control systems, and EtherCAT fieldbus equipment. The integrated PHYs reduce external Ethernet PHY count, while the ESC resources allow a host processor to exchange process data and mailbox information with the EtherCAT master. PCB implementation must preserve the package footprint and exposed-pad land pattern, provide adequate power and ground planes, route differential Ethernet pairs according to the datasheet guidance, and place magnetic-interface and decoupling components close to their associated pins. Verify isolation, magnetics, termination, and cable requirements for the target industrial installation. This page consolidates the verified manufacturer and distributor information, package and interface details, sourcing context, and design guidance for engineers evaluating the LAN9252I/PT. It is intended to accelerate BOM review and board-level planning while leaving unverified electrical parameters explicitly marked for confirmation against the manufacturer datasheet.
LAN9252T/ML - 2/3-Port EtherCAT Controller | Microchip Technology
The Microchip Technology LAN9252T/ML is a 2/3-port EtherCAT slave controller with dual integrated Ethernet PHYs, supporting full-duplex 100BASE-TX operation at 100 Mbps in a 64-pin QFN package. The controller includes an SPI host interface and supports 100BASE-FX operation through an external fiber transceiver. According to the verified Microchip product information, the LAN9252 family supports HP Auto-MDIX, allowing direct-connect or crossover Ethernet cables without manual cable selection. The LAN9252T/ML is used as an EtherCAT device controller in industrial automation systems where a slave device must exchange cyclic process data with a master controller. Its dual integrated PHYs support Ethernet connectivity within EtherCAT networks, while the SPI interface provides a straightforward connection to a host processor or microcontroller. The T/ML ordering suffix identifies the specific package, temperature, and lead-free configuration; the verified distributor listings identify the device as an Ethernet controller with a 10/100 Base-FX/T/TX PHY, SPI interface, and 64-QFN (9 x 9 mm) package. Key verified characteristics include two integrated Ethernet PHYs, full-duplex 100BASE-TX transceivers, 100 Mbps operation, HP Auto-MDIX support, and external-transceiver-based 100BASE-FX support. These features make the controller appropriate for EtherCAT servo drives, I/O modules, PLC communication interfaces, industrial gateways, and motion-control equipment. The SPI interface also allows the controller to be paired with an embedded microcontroller or application-specific processor for EtherCAT protocol handling. The LAN9252T/ML is not a general-purpose Ethernet switch and is not a memory IC despite one distributor classification. Its primary function is EtherCAT slave-controller operation. The 64-pin QFN footprint requires careful PCB layout, including high-speed differential routing for the Ethernet PHYs, controlled clock distribution, solid ground-plane continuity, and decoupling close to the device pins. Designers should verify the complete pinout, electrical limits, operating-temperature range, and power requirements against the current Microchip datasheet before release to production. This product page summarizes verified manufacturer and distributor information, identifies the available same-package drop-in candidates, and provides practical selection and design guidance without inventing electrical values that were not present in the supplied source data.
LAN9252T/PT - 2/3-Port EtherCAT Controller | Microchip
Microchip LAN9252T/PT is a 2/3-port EtherCAT device controller with dual integrated Ethernet PHYs, each containing a full-duplex 100BASE-TX transceiver operating at 100 Mbps. The device is packaged in a 64-pin TQFP-EP, 10 x 10 mm surface-mount package and provides an SPI interface for host-controller communication. Its integrated Ethernet PHYs support HP Auto-MDIX, allowing direct-connect or crossover Ethernet cables to be used. An EtherCAT device controller, or ESC, is the communications element that connects an EtherCAT slave device to an EtherCAT network. The LAN9252T/PT integrates two Ethernet PHYs and provides the hardware interface required for EtherCAT communication. This integration reduces the number of separate network interface components required in an EtherCAT slave design and provides a defined path between the host processor and the EtherCAT network. The verified product information identifies the LAN9252T/PT as an Ethernet controller with a 10/100BASE-TX PHY, SPI interface, and 64-TQFP-EP package. The two integrated PHYs each support full-duplex 100BASE-TX operation at 100 Mbps. Because the PHYs support HP Auto-MDIX, system integrators can use either straight-through or crossover cables without manually configuring the physical connections. The LAN9252 family is positioned for industrial EtherCAT applications where an embedded system needs a dedicated network controller rather than a general-purpose host Ethernet interface. Relevant application categories include EtherCAT slave devices, industrial automation equipment, motion-control systems, and distributed control equipment. The SPI host interface allows an embedded controller to access the EtherCAT controller functions while the integrated PHYs handle the physical Ethernet layer connections. The TQFP-EP package provides a 64-pin surface-mount footprint and an exposed-pad construction for board-level heat spreading. The exposed pad must be connected to the appropriate ground plane according to the manufacturer land pattern and datasheet recommendations. Designers should preserve the specified placement and routing of Ethernet, power, and signal connections rather than relying on a generic TQFP footprint. For a new EtherCAT slave design, the critical checks are electrical compatibility, EtherCAT conformance, firmware support, package layout, and the exact operating requirements of the selected companion devices. The LAN9252T/PT is identified as a 1.8 V to 3.3 V device in distributor search data. The manufacturer datasheet should be used as the controlling source for pin electrical characteristics, absolute maximum ratings, PHY behavior, clock requirements, and recommended application circuits. This page consolidates the verified manufacturer and distributor information for LAN9252T/PT and provides application, comparison, and design guidance. Because the supplied web data confirms only one distinct same-package replacement candidate, the alternatives list is intentionally not padded with unverified or functionally similar parts that would require a different footprint.
LAN9252TI/PT - 2/3-Port EtherCAT Slave Controller | Microchip
The Microchip Technology LAN9252TI/PT is a 2/3-port EtherCAT device controller (ESC) with dual integrated Ethernet PHYs, each containing a full-duplex 100BASE-TX transceiver supporting 100 Mbps operation. Housed in a 64-pin TQFP-EP (10x10 mm) package with an exposed thermal pad, it operates from 1.8 V/2.5 V/3.3 V supplies and presents a digital SPI host interface. The LAN9252TI/PT supports HP Auto-MDIX and exposes two or three Ethernet ports, enabling designers to build daisy-chain EtherCAT nodes without an external PHY. What is an EtherCAT slave controller? An EtherCAT Slave Controller is the silicon heart of a slave node on an EtherCAT fieldbus, which is a deterministic real-time Ethernet protocol widely used in industrial automation (Beckhoff's EtherCAT). The ESC handles the on-the-fly processing of Ethernet frames, manages distributed clock synchronization, and exposes process data via a host interface such as SPI or parallel bus to an application microcontroller. The LAN9252TI/PT is therefore a bridge IC: it is a slave on the EtherCAT network and a peripheral to a host MCU. It belongs to the wider category of industrial Ethernet controllers, complementing protocols such as PROFINET, EtherNet/IP and Modbus TCP. Key features include dual 100BASE-TX PHYs with HP Auto-MDIX, an SPI host interface for the application MCU, 2/3 port switch capability, integrated 1.8 V/2.5 V/3.3 V I/O tolerance, hardware cable diagnostics and an industrial temperature range. The integrated PHYs eliminate two external transceiver ICs and the associated magnetics design, while Auto-MDIX allows direct or crossover cables interchangeably. Three ports enable line, ring or star network topologies natively on the chip. Architecturally, the LAN9252TI/PT pairs an EtherCAT IP core (Beckhoff-licensed ET1100-equivalent logic) with two 100 Mbps Ethernet PHY macros and a digital SPI/parallel bridge. The device supports distributed clocks (DC) with sub-microsecond synchronization, FMMU, SyncManager and watchdog functions defined by the EtherCAT specification. Internal FIFOs decouple EtherCAT traffic from the host MCU, allowing a low-cost MCU to control a high-performance fieldbus. Typical applications include servo/stepper drives, I/O modules, sensors and actuators on EtherCAT networks, programmable logic controllers (PLC) sub-modules, robotics joint controllers and CNC axes. Industrial designers value the LAN9252TI/PT because it shrinks a complete 2-port EtherCAT slave - including magnetics and termination - onto a small PCB that talks to a low-cost SPI MCU. Designers should route the 100BASE-TX differential pairs as controlled-impedance (100 ohm differential) traces and connect the center tap of each transformer through the integrated termination resistors. The exposed thermal pad must be soldered to a sufficient copper pour to dissipate the roughly 0.5-1 W typical dissipation under 100 Mbps full-duplex operation. DC and ripple on each analog supply pin must be kept below 50 mVpp to maintain EtherCAT conformance. This page consolidates distributor pricing, drop-in alternatives, and engineering design notes that go beyond what the manufacturer datasheet provides, including same-family Microchip options and cross-brand EtherCAT competitor context.
LAN9252V/ML - 2/3-Port EtherCAT Controller | Microchip
The Microchip Technology LAN9252V/ML is a 2/3-port EtherCAT slave controller with dual integrated Ethernet PHYs, each containing a full-duplex 100BASE-TX transceiver operating at 100Mbps, in a 64-QFN 9x9 mm package. The device provides a synchronous device SPI/SQI interface for communication with a host microcontroller and supports Digital I/O Mode for signal monitoring and control by an EtherCAT master. Its two integrated PHYs support HP Auto-MDIX, allowing direct-connect or crossover Ethernet cables, while 100BASE-FX can be implemented with an external fiber transceiver. An EtherCAT slave controller is an industrial communication integrated circuit that manages EtherCAT slave-side processing and interfaces a device to an EtherCAT network. The LAN9252 belongs to the broader hierarchy of EtherCAT controller, industrial Ethernet interface, network interface controller, interface IC, and semiconductor. Integrating the Ethernet PHYs with the EtherCAT controller reduces the external component count compared with a discrete PHY implementation and provides a defined interface between the EtherCAT network and the embedded control system. Key verified features include support for two or three EtherCAT ports, two integrated full-duplex 100BASE-TX PHYs, 100Mbps operation, HP Auto-MDIX, a synchronous SPI/SQI host interface, Digital I/O Mode, and support for 100BASE-FX through an external fiber transceiver. The 64-QFN package is identified by the verified distributor listings as a 9x9 mm surface-mount package. The LAN9252V/ML uses two integrated Ethernet PHYs to support copper-based 100BASE-TX links and can also participate in fiber-based networks when the required external transceiver is added. Its architecture is intended for industrial EtherCAT slave equipment in which network connectivity, deterministic EtherCAT processing, and host-controller integration must coexist within a compact embedded design. Typical applications include industrial automation, motion-control equipment, factory I/O modules, robotics, PLC interfaces, and industrial Ethernet gateways. The LAN9252V/ML can connect embedded control electronics to EtherCAT infrastructure through 100BASE-TX while exchanging register and control data with a host MCU over the synchronous SPI/SQI interface. Digital I/O Mode provides an additional mechanism for the EtherCAT master to control or monitor device signals. When designing around the LAN9252V/ML, verify the exact board layout, exposed-pad requirements, clocking, transceiver connections, and Digital I/O signal assignments against the manufacturer datasheet before release. The LAN9252V/ML is not a general-purpose Ethernet switch; its primary role is EtherCAT slave-controller connectivity. For 100BASE-FX implementations, include the external fiber transceiver and its associated isolation, interface, and layout requirements in the system design.
LAN9253/R4X - 2/3-Port EtherCAT Controller | Microchip Technology
The Microchip Technology LAN9253/R4X is a 2/3-port EtherCAT device controller (ESC) with dual integrated Ethernet PHYs, each supporting full-duplex 100BASE-TX operation at 100 Mbps, in a 64-QFN 9x9 mm package. It provides a compact interface between an embedded EtherCAT slave and its industrial Ethernet network, reducing the need for discrete Ethernet PHY components. The LAN9253 supports 8/16-bit host-bus operation, GPIO, SPI, and MII interfaces, making it suitable for embedded controllers that need deterministic EtherCAT connectivity. The LAN9253 belongs to the EtherCAT device-controller hierarchy, where an ESC implements the EtherCAT slave-side protocol functions and interfaces the application processor or fieldbus controller to the network. Its integrated PHYs provide two 100BASE-TX ports, while the additional MII port can support a third-port configuration when connected to an external PHY. HP Auto-MDIX enables direct-connect and crossover cable support, simplifying industrial cabling and reducing installation errors. Key features include eight Fieldbus Memory Management Units (FMMUs), eight SyncManagers, integrated dual Ethernet PHYs, configurable process-data interfaces, wake-up functionality, power-up/reset configuration, non-volatile configuration storage, and interrupt generation. The verified product data identifies the LAN9253/R4X as a 2/3-port EtherCAT slave controller with integrated Ethernet PHYs, while the manufacturer documentation also supports 8/16-bit host-bus, GPIO, SPI, and MII configurations. The controller is intended for industrial automation, motion control, robotics, PLC peripherals, and distributed machine-control systems. Its integrated 100BASE-TX PHYs are useful where deterministic EtherCAT communication and compact board construction are more important than 1 GbE throughput. The 64-QFN package also requires careful exposed-pad thermal design and high-quality PCB layout. Designers should use the manufacturer LAN9253 Hardware Design Checklist and the device datasheet for pin assignment, power sequencing, magnetic-interface layout, and configuration-strap requirements. Decoupling, impedance-controlled differential pairs, grounding, and exposed-pad thermal management are essential for reliable industrial deployments. This product page combines verified manufacturer and distributor information, practical design guidance, and a structured comparison framework. It identifies the LAN9253/R4X as a compact EtherCAT controller for embedded industrial Ethernet designs while clearly separating confirmed specifications from parameters that require additional device data.
LAN9254/JRX - 3-Port EtherCAT Controller | Microchip
The Microchip LAN9254/JRX is a 3-port EtherCAT device controller with two integrated 10/100 Ethernet PHYs, 100 Mbps operation, HP Auto-MDIX support, and an 80-pin TQFP exposed-pad package measuring 12 x 12 mm. It integrates EtherCAT slave-controller functions, Ethernet physical-layer connectivity, configurable digital I/O, and multiple host interfaces for industrial motion and automation equipment. An EtherCAT device controller, or ESC, is the communication IC at the center of an EtherCAT slave device. It manages EtherCAT frames, process data, distributed clocks, and the interface between an EtherCAT network and local control hardware. The LAN9254 hierarchy is EtherCAT device controller, industrial Ethernet controller, network interface IC, and semiconductor. The controller supports 2/3-port configurations and offers an 8-bit or 16-bit host bus, 32 digital I/O, SPI, and MII interfaces. Two full-duplex 100BASE-TX transceivers provide 100 Mbps Ethernet connectivity, while HP Auto-MDIX permits straight-through or crossover cable connections. This combination can reduce external Ethernet PHY circuitry and simplify industrial network PCB routing. Technically, the LAN9254 can operate as a three-port device by using its additional MII connection for a flexible network configuration. The same controller supports EtherCAT Distributed Clocks and is positioned for real-time industrial communication. The 80-TQFP-EP package provides 32 digital I/O in addition to the communication interfaces, making the device suitable for compact, multi-axis industrial control hardware. Typical uses include EtherCAT servo drives, motion controllers, programmable logic control equipment, industrial I/O modules, robotics, and factory automation controllers. Its integrated PHYs are especially useful where each axis or machine node requires Ethernet connectivity without an external 10/100 PHY. PCB design should follow Microchip's LAN9254 Hardware Design Checklist, including careful EtherCAT differential routing, controlled-length or impedance-sensitive interfaces where applicable, solid supply decoupling, and proper exposed-pad thermal management. Review the migration guide when moving from LAN9252 or LAN9253 because the source explicitly identifies pin and configuration-strap differences. This product record combines verified manufacturer and distributor information, package and interface details, sourcing context, and practical EtherCAT design guidance. It also distinguishes known order-code variants from unsupported substitutes so engineers can assess drop-in suitability without relying on generic cross-reference results.
LAN9255-I/ZMX019 - EtherCAT Slave Controller + Cortex-M4F MCU | Microchip
The Microchip Technology LAN9255-I/ZMX019 is a 2/3-port EtherCAT device controller (ESC) System-In-Package (SIP) integrating dual 100BASE-TX Ethernet PHYs, the Microchip LAN9253 ESC, and the Microchip SAM E53J ARM Cortex-M4F MCU into a single 128-pin TQFP (14x14 mm) package. It supports 100 Mbps (100BASE-TX) full-duplex communication, includes 512 kB of integrated MCU memory, and offers USB 2.0 plus RMII host interfaces for broad system connectivity. An EtherCAT slave controller is a specialized industrial-Ethernet IC that offloads the EtherCAT protocol stack (originally developed by Beckhoff Automation) from the host processor, allowing deterministic sub-cycle communication on standard 100BASE-TX cabling. EtherCAT belongs to the industrial-Ethernet protocol family alongside PROFINET, EtherNet/IP, and SERCOS, and is governed by the ETG (EtherCAT Technology Group). Within the broader hierarchy, the LAN9255 sits as an Industrial Communication IC -> Network Controller -> Semiconductor. Integrating the PHY, ESC, and application MCU into one SIP reduces board area, simplifies EMC design, and removes the need for an external host MCU in cost-sensitive slave designs. Key features of the LAN9255-I/ZMX019 include three EtherCAT ports (Port 0, Port 1, and a cascaded/loopback Port 2), integrated dual 100BASE-TX PHYs that eliminate external magnetics interfacing complexity, USB 2.0 Full-Speed (12 Mbps) device port, RMII interface for an external host MCU if desired, on-chip Cortex-M4F MCU with FPU for application code, hardware offload of EtherCAT mailbox and process-data handling, and industrial-grade -40 C to +85 C operation. The 128-TQFP package is lead-free and RoHS compliant for global industrial deployment. The LAN9255 architecture combines Microchip's proven LAN9253 ESC IP with the SAM E53J ARM Cortex-M4F microcontroller, enabling stand-alone EtherCAT slave designs. The dual integrated PHYs each provide full-duplex 100BASE-TX transceivers with HP auto-MDI/MDIX, removing the need for two external PHY ICs. Distributed clocks and cable redundancy features are handled in hardware, ensuring deterministic communication for servo, motion, and I/O applications. The device works with the MPLAB Harmony EtherCAT Slave Stack and Microchip's EVB-LAN9255 evaluation platform. Typical applications for the LAN9255-I/ZMX019 include EtherCAT servo drives, distributed I/O modules, stepper motor controllers, sensor and encoder EtherCAT slaves, hydraulic valve drivers, and industrial robot subsystems. The integrated MCU + dual-PHY combination is particularly attractive for designers building minimum-BOM EtherCAT slaves without a separate host processor. When designing with this part, ensure the 128-TQFP thermal pad is soldered to a substantial ground copper pour for heat extraction and signal-integrity performance. Use Microchip's AN-DS LAN9255 PHY layout guidelines for proper Ethernet magnetics and RJ45 interface. The integrated MCU eliminates the need for an external application processor in many designs, simplifying BOM cost. This page synthesizes distributor pricing, drop-in alternatives, and application-focused design guidance that goes beyond what the LAN9255 datasheet (Microchip document 00003646B) covers alone.
LAN9255-V/ZMX020 - EtherCAT Slave Controller with MCU | Microchip
The Microchip Technology LAN9255-V/ZMX020 is a 2/3-port EtherCAT Device Controller with integrated dual 100BASE-TX PHYs and an integrated SAM E53J 32-bit ARM Cortex-M4F MCU, packaged in a 128-pin TQFP-EP (14x14 mm) with exposed thermal pad. It combines an EtherCAT slave controller, two Ethernet PHYs, and an application microcontroller in a single System-In-Package (SiP), eliminating the need for an external MCU on simple EtherCAT slave node designs. An EtherCAT slave controller (ESC) is a specialized industrial-Ethernet IC that implements the Beckhoff EtherCAT slave protocol on the device side of an EtherCAT network. EtherCAT is a deterministic real-time Ethernet standard used for synchronized motion control, I/O, and drive communication in factory automation. The ESC sits below the EtherCAT master and the standard Ethernet/IP stack in the network hierarchy and works alongside general industrial controllers like PLCs and motion controllers. Key features of the LAN9255-V/ZMX020 include dual integrated 100BASE-TX Ethernet PHYs supporting 100 Mbps full-duplex, a 3-port EtherCAT switch fabric supporting daisy-chain and ring topologies, USB 2.0 FS device/host interface, RMII for external PHY connection, SPI/QSPI for host communication, and 1024 KB of integrated Flash and 256 KB SRAM inside the SAM E53J MCU die. The integrated MCU is pre-flashed with a bootloader and can run application code for simple slaves, removing external processor overhead. The device is designed for high-volume industrial EtherCAT slave applications where board space, BOM cost, and deterministic cycle time are critical. Typical cycle times below 62.5 µs are achievable through hardware FMMU, SyncManager, and DC (Distributed Clocks) engines. Typical applications include EtherCAT digital and analog I/O modules, servo drives and stepper motor drivers, robotics servo nodes, sensor hubs, encoder interfaces, and other industrial automation peripherals. The dual PHY + MCU integration makes it ideal for compact, low-cost slaves with on-board intelligence. When designing with the LAN9255, ensure proper 25 MHz reference oscillator quality for jitter compliance, route the MII/RMII traces as 50-ohm controlled impedance, and place the decoupling capacitors as close to the supply pins as possible. The exposed thermal pad must be soldered to a sufficient copper pour for thermal dissipation. This page synthesizes distributor pricing across 9 channels, true drop-in alternatives in the same 128-TQFP-EP footprint, and practical design notes not found in the manufacturer datasheet, giving engineers a single source for selection, sourcing, and integration.
LAN9311-NU - 2-Port 10/100 Managed Ethernet Switch | Microchip
The Microchip LAN9311-NU is a full-featured, 2-port 10/100 managed Ethernet switch controller with integrated 10/100 Base-T/TX PHY support and an I2C interface, packaged in a 128-pin VTQFP measuring 14 x 14 mm. It delivers 10 Mbit/s and 100 Mbit/s operation for embedded networking products that need compact, integrated Ethernet connectivity. An Ethernet switch controller is a semiconductor that combines media-access control, frame handling, port management, and physical-layer functions into an embedded networking solution. The LAN9311 belongs to the interface IC and Ethernet switch hierarchy, allowing equipment designers to connect processors, controllers, sensors, and industrial equipment through managed 10/100 Ethernet without implementing a discrete switching subsystem. Verified features include a 32 Kbyte buffer RAM, a 1 K-entry forwarding table, and IEEE 802.1Q VLAN support with 16 groups. The switch also provides programmable quality-of-service support through four dynamic queues per port. Full-duplex and half-duplex operating modes are supported, giving designers flexibility across embedded infrastructure, industrial automation, and connected equipment. The LAN9311-NU integrates two 10/100 Ethernet ports and combines switch management with a 16-bit non-PCI host interface for embedded processor connectivity. Its managed-switch functions include VLAN grouping, QoS prioritization, address learning through the 1 K-entry forwarding table, and frame buffering through 32 Kbyte of RAM. These features support deterministic traffic handling when multiple endpoints share the same two-port Ethernet segment. Typical uses include industrial Ethernet gateways, embedded routers, set-top and communication equipment, factory-floor controllers, and networked measurement systems. A design can place the controller beside a processor and Ethernet magnetics, then use the host interface for configuration and status monitoring. The supplied LAN9311 reference schematic emphasizes placing bulk and low-ESR decoupling capacitors close to the specified power pins. The main design consideration is interface and power integrity. Follow the manufacturer's reference schematic and 128-pin VTQFP placement checklist, especially the 49.9 ohm TX termination pull-up arrangement described for the second PHY interface. Confirm package routing, magnetics isolation, thermal performance, and all pin assignments against the manufacturer documentation before layout release. This page consolidates verified distributor availability, package and interface details, cross-reference findings, comparison parameters, and practical LAN9311 layout guidance. It is intended to accelerate component selection and PCB planning while clearly separating confirmed specifications from data requiring a manufacturer datasheet review.
LAN9312-NU - 2-Port 10/100 Managed Ethernet Switch | Microchip
Microchip Technology LAN9312-NU is a two-port 10/100 managed Ethernet switch with a 32-bit non-PCI CPU interface, IEEE 802.3 Ethernet support, and 128-pin VTQFP packaging. It combines two integrated Fast Ethernet network ports with switching and host-interface functions for embedded systems. According to the verified manufacturer and distributor results, the LAN9312-NU supports 10BASE-T and 100BASE-TX operation, full- and half-duplex protocols, and 802.1D/802.1Q network-management protocols. A managed Ethernet switch is a network-interface device that connects multiple Ethernet ports and forwards frames between them while providing management functions beyond basic unmanaged switching. In the broader hierarchy, LAN9312-NU belongs to Ethernet switches, then network interface controllers, interface ICs, and semiconductors. Its integrated two-port architecture can reduce the need for separate Ethernet PHYs and switch devices in embedded equipment. Key verified features include two 10/100 Ethernet ports, integrated 10BASE-T/100BASE-TX PHY support, a parallel 32-bit non-PCI CPU interface, and support for industry-standard Fast Ethernet protocols. The verified product listings identify the package as 128-pin VTQFP, measuring 14 mm by 14 mm. The device is intended for embedded applications where performance, flexibility, integration, and system-cost control are important. The LAN9312-NU architecture is designed to interface an embedded processor directly with Ethernet networking while avoiding a PCI bus requirement. This makes it suitable for industrial controllers, embedded gateways, test equipment, building-automation controllers, and other systems requiring dual-port Fast Ethernet connectivity. The independent port support also allows designs to use two network links rather than a single-port Ethernet arrangement. Typical deployment considerations include correct magnetics selection, controlled impedance routing, termination placement, power-supply decoupling, and validation of the non-PCI host interface. The verified Microchip placement checklist specifically calls for the LAN9312 (X)VTQFP PHY interface to place the 49.9 ohm TX termination pull-up close to the appropriate LAN9312 pins when Auto-MDIX is enabled, or close to the magnetics when Auto-MDIX is disabled. For exact pin assignments, timing, electrical limits, clock requirements, and initialization values, use the manufacturer datasheet rather than distributor summaries. The supplied web results do not provide complete verified values for several detailed electrical, timing, and package parameters; those fields are explicitly marked as data-needed below. This page combines verified product identity, protocol capability, package information, sourcing links, and design guidance while avoiding unsupported parameter invention.
LAN9313-NZW - 3-Port 10/100 Ethernet Switch | Microchip
The Microchip Technology LAN9313-NZW is a three-port 10/100 managed Ethernet switch with a parallel MII interface, 128-XVTQFP package, and 14 mm by 14 mm body size. It supports 10BASE-T, 100BASE-TX, and 100BASE-FX connectivity according to the manufacturer datasheet, making the device suitable for embedded industrial, communications, and networked equipment requiring three integrated Ethernet ports. An Ethernet switch is a network-semiconductor category that forwards Ethernet frames between connected ports while supporting full- and half-duplex operation. Within the networking hierarchy, the LAN9313-NZW is an Ethernet switch controller with an embedded Ethernet PHY and Media Independent Interface, bridging an embedded processor or host processor to copper or fiber Ethernet networks. It also supports IEEE 802.1D and 802.1Q network-management protocol specifications. Three configurable general-purpose input/output pins are available for integration with control, status, or interrupt functions beyond the primary Ethernet interface. The device combines switching, physical-layer, and host-interface functions in one package, reducing the need for separate Ethernet PHY components when the parallel MII architecture is appropriate for the host processor. The LAN9313-NZW architecture integrates three 10/100 Ethernet ports with a parallel MII connection to the host. This parallel interface suits embedded systems that have a dedicated controller bus rather than a USB or RGMII interface. Its 128-XVTQFP package provides a compact surface-mount implementation for space-constrained equipment, although exact pin assignments and exposed-pad thermal details must be confirmed in DS00002288A before layout. Typical uses include industrial control equipment, embedded gateways, factory networking modules, communications appliances, and systems requiring both 10BASE-T and 100BASE-TX ports. A 100BASE-FX-capable implementation can also serve fiber-based network interfaces when the board includes suitable optical magnetics and the required external circuitry. The main design consideration is the parallel MII interface. Its wiring, signal-integrity requirements, and host-bus compatibility must be evaluated against the processor used in the design. Decoupling, exposed-pad connection, clocking, magnetics, and LED interfaces should be implemented using the guidance in the manufacturer datasheet and LAN9313 reference-design schematic rather than inferred from general Ethernet practice. This product page consolidates the verified manufacturer and distributor information, identifies package-related documentation gaps, compares the documented LAN9313 family variant, and provides selection guidance that helps distinguish a genuine drop-in option from a merely similar Ethernet controller.
LAN9352/ML - 2-Port 10/100 Managed Ethernet Switch, SPI/SQI | Microchip
The Microchip LAN9352/ML is a high-performance, small-footprint, full-featured 2-port managed Ethernet switch with integrated 10/100 Base-T/TX PHYs, delivered in a 72-pin QFN (10x10 mm) package with exposed pad. It targets consumer, embedded, and industrial designs that require highly integrated, cost-effective dual-port switching with a non-PCI 16-bit SPI/SQI host interface. The device supports 1.8V to 3.3V I/O and core supplies, easing integration with low-voltage MCUs and ASICs. A managed Ethernet switch is a Layer-2 networking device that connects multiple Ethernet segments, performs MAC-based frame forwarding, and exposes configuration/management features such as VLANs, QoS, port mirroring, and statistics counters. The LAN9352 sits in the managed-fast-Ethernet-switch IC taxonomy: Ethernet switch -> Layer-2 switch -> managed switch -> integrated-PHY switch. Unlike an unmanaged switch, the LAN9352/ML allows the host MCU to program registers for traffic shaping, IGMP snooping, and storm control, which is critical for real-time industrial protocols and AV streaming. Key features include two integrated 10/100 PHYs with HP Auto-MDIX, support for IEEE 802.1Q VLAN and 802.1p QoS priority, a 16-bit SPI/SQI host interface, optional I2C management, and 32 KB of internal packet buffer. The device operates across the commercial 0C to 70C temperature range and supports Energy Efficient Ethernet (EEE) idle patterns, making it suitable for power-sensitive embedded applications. The LAN9352/ML uses Microchip's proprietary switch fabric and supports cut-through and store-and-forward modes, along with 1.5 KB per-port address table. Hardware-based QoS with four priority queues and a per-port rate limiter enable deterministic traffic shaping for industrial Ethernet, audio/video bridging (AVB), and PROFINET-style real-time protocols. Typical applications include industrial Ethernet gateways, factory automation PLCs, building automation controllers, IP surveillance NVR/DVR switches, point-of-sale terminals, embedded web server appliances, and consumer smart-home hubs that need a low-BOM 2-port switch fabric. The integrated dual-PHY approach removes the need for an external Ethernet transformer-pair, shrinking PCB area. When designing with this device, allocate at least 4-layer routing for the two 100BASE-TX differential pairs to maintain return loss. Place the 72-QFN exposed pad soldered to a continuous ground plane for thermal dissipation; a stitched via array under the EP is recommended. The host SPI/SQI clock can run up to 80 MHz - check MCU timing margin when the switch is in cut-through mode. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, plus a 5-question FAQ block for AEO citation.
LAN9352/PT - 2-Port 10/100 Managed Ethernet Switch | Microchip
The Microchip Technology LAN9352/PT is a 2-port 10/100 managed Ethernet switch with integrated 10/100 Base-T/TX PHYs, I2C and SPI host interfaces, and an 80-pin TQFP exposed-pad package measuring 12 x 12 mm. It combines two Ethernet ports, switch management, and host connectivity in one device for cost-controlled embedded networking. The verified source identifies it specifically as a 2-port, 100 Mbps managed Ethernet switch. An Ethernet switch is a network-interface semiconductor that connects multiple Ethernet endpoints, forwards frames between ports, and exposes control functions to a host processor. The LAN9352/PT sits in the hierarchy of Ethernet controller, interface IC, network switch, and embedded connectivity semiconductor. Its integrated 10/100 PHIs reduce external PHY requirements while its managed-switch architecture supports configuration by an embedded controller rather than a simple fixed-function repeater. The principal verified features include two 10/100 Ethernet ports, integrated 10/100 Base-T/TX PHYs, and both I2C and SPI host interfaces. These interfaces give the embedded system two control paths, while the managed architecture provides a feature set intended for consumer, embedded, and industrial designs. Microchip describes the family as optimized for systems that need high integration, design flexibility, ease of integration, and system cost control. The LAN9352/PT targets equipment that needs a compact two-port network node without a separate Ethernet switch and external PHY components. A host processor can configure the device through I2C or SPI, making it suitable for gateways, embedded controllers, industrial interfaces, and connected products. Exact port ordering, register defaults, electrical limits, timing, and management features must be confirmed in the manufacturer datasheet before schematic release. A primary integration consideration is the 80-pin 12 x 12 mm TQFP exposed-pad footprint. The land pattern, exposed-pad connection, clock source, magnetics or integrated PHY support components, and host signals must follow the reference design. Do not treat a functional LAN9352-family ordering code as automatically drop-in compatible; the I, TI, and temperature-grade suffixes can change device features or qualification. For an embedded two-port Ethernet design, the LAN9352/PT offers meaningful consolidation of switch and PHY functions. Selection depends on the required port count, host interface, timing, clock architecture, environmental grade, package, and production availability. This page combines verified distributor and manufacturer information with application guidance while leaving unverified electrical values explicitly marked for completion.
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.
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.