1/1 Transceiver Half Ethernet 32-VQFN (5x5) #CommonPartsLibrary #IntegratedCircuit #Interface #Driver #Receiver #Transceiver

Ethernet Controller 10/100 Base-T/TX Bus Interface 80-TQFP-EP (12x12) The LAN9254-I/JRX is an EtherCAT SubDevice (slave) controller developed by Microchip Technology, designed to serve as the communication backbone for industrial automation devices participating in an EtherCAT network. The device integrates dual Ethernet physical layer transceivers directly on-chip, eliminating the need for external PHY components and simplifying the design of EtherCAT-enabled equipment such as servo drives, sensors, I/O modules, and other field devices used in real-time industrial control systems. Architecturally, the controller can operate as either a two-port or three-port node, depending on the network topology required. In its standard configuration it functions as a two-port device supporting daisy-chain connections typical of EtherCAT line topologies. When configured as a three-port device, it gains an additional management interface port that can connect to an external PHY or to another LAN9254, enabling star or tree network topologies and allowing the device to act as a branching point within a larger EtherCAT installation. Each integrated Ethernet PHY operates in full-duplex mode and supports automatic crossover detection, so the device can use either straight-through or crossover cabling without requiring manual configuration. Beyond pure protocol handling, the LAN9254 includes a substantial set of general-purpose digital input and output lines, allowing it to be used in simple field devices without requiring a separate microcontroller. For more complex applications, the device communicates with an external host processor through an integrated host bus interface that behaves like simple memory-mapped SRAM, supporting both 8-bit and 16-bit data widths along with multiple byte-ordering conventions, which makes it straightforward to interface with a wide range of microcontroller and microprocessor architectures. Internally, dual process data RAM buffers manage the exchange of real-time process data between the host application and the EtherCAT communication engine, while a dedicated interrupt line notifies the host of relevant internal events. A key feature of the device is its built-in distributed clock mechanism, which provides high-precision timing synchronization across all nodes in an EtherCAT network. This capability is essential for motion control and other applications where multiple devices must act in tight temporal coordination. The controller also provides configurable status indication through standard network activity and link LEDs, along with optional error and run-state indicators that give visibility into the health and operational state of the device at a glance. Power architecture on the LAN9254 is simplified through an integrated linear regulator, allowing the device to be operated from a single primary supply rail while internally generating the lower voltage needed for its core logic. This reduces the external power supply complexity that would otherwise be required to support separate core and I/O voltage domains. The "-I" designation on this particular part number indicates an industrial-grade temperature rating, making it suitable for deployment in factory floor and other demanding industrial environments where extended thermal range and long-term reliability are required. The device is housed in a surface-mount package consistent with dense industrial control board layouts and is compliant with RoHS material restrictions. Spec Sheet Identification Part Number: LAN9254-I/JRX Device Family: LAN9254 Manufacturer: Microchip Technology Functional Classification Device Type: EtherCAT SubDevice (slave) controller Network Role: Two/three-port configurable node Integrated PHYs: Dual Ethernet physical layer transceivers, on-chip Auto-MDIX Support: Yes, supports direct and crossover cabling Communication & Protocol Features Protocol: EtherCAT Topology Support: Daisy-chain (line), star, and tree topologies Additional Port Mode: Optional third port for branching/tap configurations Clock Synchronization: Integrated distributed clock for high-precision timing Host Interface Interface Type: SRAM-like host bus interface Data Width Support: Selectable bit-width host bus operation Endianness Support: Multiple byte-ordering modes Process Data Handling: Dual process data RAM buffers Interrupt Support: Configurable host interrupt line Digital I/O General-Purpose I/O: Integrated digital I/O lines for microcontroller-less operation Standalone Mode: Supports operation without external microcontroller for simple device designs Power Architecture Supply Configuration: Single primary supply rail Internal Regulation: Integrated linear regulator for core voltage generation Status Indication LED Support: Standard run and link/activity indicators per port Optional Indicators: Configurable error and run-state status indicators Environmental & Qualification Temperature Grade: Industrial ("-I" suffix) RoHS Compliance: Yes Package Package Type: Surface-mount, quad flat package style Mounting: Surface mount technology (SMT) Packaging Format Supply Format: Tape-and-reel, per part suffix designation #LAN9254 #Microchip #EtherCAT #SlaveController #SubDeviceController #IndustrialEthernet #IndustrialAutomation #MotionControl #EmbeddedSystems #FieldDevice #DigitalIO #HostBusInterface #DistributedClock #TQFP #RoHSCompliant #IndustrialGrade #EngineeringSpec #ComponentLibrary #CommonPartsLibrary #SemiconductorIC

Jack Modular Connector 8p8c (RJ45, Ethernet) 90° Angle (Right) Shielded, EMI Finger Cat3 #CommonPartsLibrary #Connector #Jacks #RJ45

Ethernet Switch IEEE 802.3, 10 Base-T PHY Serial, SPI Interface 48-LFCSP (7x7) #commonpartslibrary #integratedcircuit #ethernet

Jack Modular Connector 8p8c (RJ45, Ethernet) Vertical Unshielded Cat3 #commonpartslibrary #connector #modularjack #8P8C #RJ45

Power Over Ethernet Controller 5 Channel 802.3cg (PoE) 48-QFN (7x7) #commonpartsLibrary #integratedcircuit #powermanagement #poe

Ethernet Interface 32-VQFN (5x5) #commonpartslibrary #integratedcircuit #ethernet

Jack Modular Connector 8p8c (RJ45, Ethernet) Vertical Unshielded Cat3 #CommonPartsLibrary #Connector #Jack #RJ45

4/4 Transceiver Full Ethernet 48-QFN (7x7)#Ethernet #commonpartslibrary

1/1 Transceiver Ethernet 40-WQFN (6x6) #commonpartslibrary #integratedcircuit #transceiver #ethernet

Power Over Ethernet Controller 1 Channel 802.3at (PoE+), 802.3af (PoE) 32-QFN (5x5) #CommonPartsLibrary #IntegratedCircuit #PowerManagement #PoE #PD70201

Power Over Ethernet Controller 1 Channel 802.3at (PoE+), 802.3af (PoE) 24-QFN (4x5) #CommonPartsLibrary #IntegratedCircuit #PowerManagement #PoE #Controller #PD69101

350µH LAN 10/100 Base-T, Power over Ethernet (PoE) Pulse Transformer 1:1 Surface Mount #CommonPartsLibrary #Transformer #SM

Power Over Ethernet Controller 1 Channel 802.3af (PoE) 8-SOIC #commonpartslibrary #integratedcircuit #powermanagement #poweroverethernet

Jack Modular Connector 8p8c (RJ45, Ethernet) 90° Angle (Right) Shielded #CommonPartsLibrary #Connector

Ethernet Bridge, USB to Ethernet USB 2.0, 10/100 Base-T/TX PHY USB Interface 56-QFN (8x8) #commonpartslibrary #integratedcircuit #interfacecontroller #ethernetbridge

Ethernet Controller 10/100 Base-T/TX PHY Parallel Interface 56-QFN (8x8) #commonpartslibrary #integratedcircuit #ethernetcontroller

1/1 Transceiver Full, Half Ethernet 40-LFCSP (6x6) #CommonPartsLibrary #IntegratedCircuit #Interface #Driver #Receiver #Transceiver

1 Port RJ45 Through Hole 10/100 Base-T, AutoMDIX, Power over Ethernet (PoE) #Connector #Ethernet-connector #RJ45

Ethernet Controller 10 Base-T PHY SPI Interface 28-SSOP #commonpartslibrary #integratedcircuit #interfacecontroller

Ethernet Controller 10 Base-T PHY SPI Interface 28-SOIC #commonpartslibrary #integratedcircuit #ethernet-controller

Jack Modular Connector 8p8c (RJ45, Ethernet) 90° Angle (Right) Shielded Cat3 #commonpartslibrary #connector #modular #jack #rj45

Modular Connectors / Ethernet Connectors Receptacle etherCON CAT5 A series PCBH halo light ring disassembled compound push #CommonPartsLibrary #Connector #Modular-connector #Ethernet-connector

Ethernet Controller 10 Base-T PHY 8K SPI Interface 28-SSOP #commonpartslibrary #Integrated Circuits #interfacecontroller #ethernet