LAN9254T/JRX - 3-Port EtherCAT Slave Controller | Microchip
N.º de pieza: LAN9254T/JRX ✓ ActivoLAN9254T/JRX Descripción general
An EtherCAT slave controller is the real-time protocol engine that terminates an EtherCAT segment on an industrial network. It sits between the EtherCAT master and the fieldbus device logic, decoding distributed clock timing, processing the 1-bit working-counter protocol, and forwarding frames port to port with only a few hundred nanoseconds of link delay. In system terms, the LAN9254T/JRX belongs to the hierarchy EtherCAT ESC > industrial Ethernet controller > network interface controller > interface IC > semiconductor.
Key features include 2 or 3 logical EtherCAT ports implemented through two integrated PHYs plus a loopback-capable MII interface, 32 configurable digital I/Os for direct slave-signal interfacing, integrated HP Auto-MDIX that removes the need for strapping resistors and straight-through versus crossover cable rules, and a single 3.3 V supply. The 32 DIGIOs let a simple drive or I/O module present real process data to the master without an external discrete I/O expander.
Architecturally, the LAN9254T/JRX combines a dedicated EtherCAT protocol engine with dual 100BASE-TX transceivers in one die, so the board needs only a magnetic Ethernet isolation pair per port and a small crystal or oscillator for the 25 MHz reference. Integration reduces BOM count, frees PCB area, and shortens the timing path between the PHY and the MAC, which supports deterministic cycle times in motion-control loops.
Typical applications include servo and stepper drive inverters, industrial I/O modules, robot controller peripherals, and PLC-adjacent automation nodes where the master polls the ESC over EtherCAT and the DIGIOs carry limit switches, brake releases, or discrete sensor lines.
Designers should plan the 25 MHz reference clock and the differential magnetics layout carefully: keep the 100BASE-TX pairs short and impedance controlled, and follow the reference schematic for the PHY termination and decoupling network.
This page consolidates distributor availability, drop-in same-package alternatives, and practical layout and thermal guidance that go beyond the manufacturer product summary.
Alternativas directas para LAN9254T/JRX — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con LAN9254T/JRX (mismo factor de forma y huella) — difiere en Package.
LAN9254T-V/JRX
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LAN9254T-I/JRX
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LAN9254/JRX
✅ Sustitución directaConsulte el precio
Ver hoja de datos →LAN9254T/JRX Especificaciones
| Device Type | 2/3-Port EtherCAT Slave Controller (ESC) |
| EtherCAT Ports | 2 or 3 ports |
| Integrated Ethernet PHYs | 2 x 100BASE-TX transceiver |
| Ethernet Data Rate | 100 Mbps full duplex |
| Digital I/O | 32 DIGIOs |
| Tensión de alimentación | 3.3 V |
| Temperatura de funcionamiento | -40 C to +85 C |
| Encapsulado | 80-pin TQFP-EP (12 x 12 mm) |
| Tipo de montaje | Surface Mount |
| Auto-MDIX | HP Auto-MDIX supported |
| Ethernet Interface | 10/100 Base-T/TX bus interface |
| Estado RoHS | Compliant |
| Integrated PHY Count | 2 |
| PHY Cable Support | Direct-connect or crossover LAN cables |
Guía de configuración de pines de LAN9254T/JRX 80-pin tqfp-ep (12 x 12 mm)
Configuración de pines para LAN9254T/JRX (encapsulado 80-pin tqfp-ep (12 x 12 mm)). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para LAN9254T/JRX.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
LAN9254T/JRX es adecuado para 6 aplicacións: Servo Drive Inverter EtherCAT Interface, Distributed Industrial I/O Module, Robot Controller Peripherals, PLC-Adjacent Automation and Motion Nodes, Test and Measurement Instrument Front Panel, Data Acquisition and Sensor Gateway Nodes.
Servo Drive Inverter EtherCAT Interface
The LAN9254T/JRX terminates the EtherCAT segment inside a servo drive inverter and exposes 32 digital I/Os for brake release, limit switches and fault flags. With two integrated 100BASE-TX PHYs at 100 Mbps full duplex, the controller supports ring topology for redundancy, while the 80-pin TQFP-EP (12 x 12 mm) package keeps the footprint compatible with existing drive boards. At 3.3 V over -40 C to +85 C, it fits the thermal envelope of a sealed cabinet-mounted drive. The protocol engine handles distributed clocking and working-counter processing locally, so the drive MCU only exchanges process data.
Recomendado
Distributed Industrial I/O Module
A distributed I/O module uses the LAN9254T/JRX as the EtherCAT slave controller that maps remote digital channels back to the master. The 32 DIGIOs on the T variant let a compact 16 or 32-channel module drive discrete outputs and latch inputs without an external I/O expander, and the 3-port architecture supports both line and branch topologies for cabinet-level fieldbus distribution. Operating at 3.3 V and -40 C to +85 C, the device suits factory-floor enclosures where temperature cycling is routine. Because the EtherCAT engine and the PHYs share a single die, board area and BOM cost drop versus discrete MAC plus PHY solutions.
Recomendado
Robot Controller Peripherals
Robot joint and end-effector controllers need a deterministic, wired network node close to the actuator. The LAN9254T/JRX provides 2/3-port EtherCAT connectivity with 100 Mbps full-duplex PHYs so several joints can be chained through the same ring, and the 32 digital I/Os handle discrete interlock lines, home sensors and gripper control. Operating from a single 3.3 V supply keeps the local rail count low in space-constrained joint electronics, and the -40 C to +85 C range covers the thermal swings seen inside robotic arms. The exposed pad in the 80-pin TQFP-EP (12 x 12 mm) package improves heat spreading under continuous cyclic load.
Recomendado
PLC-Adjacent Automation and Motion Nodes
The LAN9254T/JRX can serve as the EtherCAT slave interface for motion and logic nodes that sit next to a PLC or an industrial PC master. Two integrated 100BASE-TX PHYs allow the node to be wired inline with a ring, and HP Auto-MIDX removes the need to distinguish straight-through from crossover cables in the field, which reduces installation errors. The controller runs from a 3.3 V supply and supports the -40 C to +85 C industrial range, matching typical control cabinet conditions. The 32 DIGIOs support direct connection of local pushbuttons, lamps and discrete sensor outputs without extra logic.
Recomendado
Test and Measurement Instrument Front Panel
Laboratory and field test instruments increasingly need an EtherCAT option for synchronization with production test cells. The LAN9254T/JRX provides a standards-compliant EtherCAT slave endpoint with two integrated 100BASE-TX PHYs so the instrument can be chained into a larger cell network, and the 32 digital I/Os can be used for trigger, pass/fail and interlock signalling. The -40 C to +85 C range covers instrument environments from bench to factory floor. Using the integrated PHY rather than an external MAC plus PHY pair reduces the front-panel component count and shortens the deterministic timing path.
Recomendado
Data Acquisition and Sensor Gateway Nodes
Sensor gateways that aggregate multiple analog and digital channels can use the LAN9254T/JRX to publish synchronized data over EtherCAT. The three-port capability supports a chain of acquisition modules, while the 32 DIGIOs carry discrete sensor states, trigger lines and alarm outputs alongside the analog path. A single 3.3 V supply and the -40 C to +85 C industrial temperature range suit compact remote stations in factory environments. Because HP Auto-MDIX is supported, both straight-through and crossover cables can be used interchangeably, which simplifies field wiring and maintenance for technicians who rarely consult cable-routing charts.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LAN9254T/JRX — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LAN9254T-V/JRX | LAN9254T-I/JRX | LAN9254/JRX | LAN9353T/PT |
|---|---|---|---|---|---|
| Package | 80-TQFP-EP (12 x 12 mm) | 80-TQFP-EP (12 x 12 mm) - same | 80-TQFP-EP (12 x 12 mm) - same | 80-TQFP-EP (12 x 12 mm) - same | 64-pin QFN - different footprint, not pin compatible |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Device Type | 2/3-Port EtherCAT Slave Controller (ESC) | 2/3-Port EtherCAT Slave Controller (ESC) | 2/3-Port EtherCAT Slave Controller (ESC) | EtherCAT Slave Controller, 80-TQFP-EP | Single-Port EtherCAT Controller with integrated PHY |
| Integrated Ethernet PHYs | 2 x 100BASE-TX full duplex | 2 x 100BASE-TX full duplex | 2 x 100BASE-TX full duplex | 2 x 100BASE-TX full duplex | 1 x 100BASE-TX |
| Ethernet Data Rate | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps |
Diferenciadores clave
- Three-port EtherCAT connectivity with two integrated PHYs in a single 80-pin device (frente a LAN9353T/PT)
- 32 digital I/Os integrated into the EtherCAT slave controller (frente a LAN9254/JRX)
- Industrial temperature and RoHS positioning for factory-floor equipment (frente a LAN9254T-V/JRX)
- HP Auto-MDIX simplifies field cabling (frente a LAN9254T-I/JRX)
Notas de diseño
Each 100BASE-TX port requires a 1:1 isolation transformer and appropriate termination network, and the differential pairs must be routed as controlled-impedance 100 ohm differential traces with no stubs and tight length matching. Place the magnetics close to the PHY pins, keep the connector-side copper free of test points, and follow the manufacturer hardware design guide for the recommended trace geometry. Because the LAN9254T/JRX integrates two PHYs on one die, the two port layouts should be kept electrically identical to minimise radiated emissions.
Decouple the 3.3 V rail at the device with a short, low-inductance loop combining a bulk bulk capacitor with 100 nF ceramic parts placed directly on the supply and ground pins. The integrated PHY biasing and the protocol engine both draw current on the same rail, so supply droop shows up directly as Ethernet link errors and EtherCAT working-counter errors. Provide a dedicated 3.3 V regulator branch with its own filtering rather than sharing the rail with noisy motor-drive stages in the same board.
Estimated: the 80-pin TQFP-EP (12 x 12 mm) package conducts heat through the exposed pad, so a solid ground-pad pour with thermal vias is required under the device to keep the junction temperature in range. Exact dissipation depends on PHY activity, link traffic and ambient temperature, which must be taken from the manufacturer datasheet thermal data. Do not rely on the exposed pad alone for a device mounted near a hot power stage; keep copper away from isolated regions or add heat spreading over the pad.
Route the reference clock and the MII/host interface traces as short, length-matched, continuously referenced lines on a solid ground plane, and keep the clock away from the 100BASE-TX differential pairs. The EtherCAT cycle time depends on deterministic link delay, so avoid vias and layer changes on the timing-critical nets, and terminate unused inputs so that ringing on the digital I/O lines does not create false edges. Use the manufacturer reference schematic as the authority for strap resistors and pull-ups.
Do not substitute the base LAN9254/JRX for the LAN9254T/JRX without checking the 32 digital I/O pin assignment, since the T suffix adds those resources to the same 80-pin outline. Similarly, the LAN9353T/PT uses a 64-pin QFN package and is not pin compatible. Confirm that the EtherCAT master, the ESI file and the slave application firmware match the device variant, and verify the automotive or industrial grade suffix against your production temperature requirements before releasing the BOM.
Información de cumplimiento
RoHS compliance is indicated for the LAN9254T/JRX on the JLCPCB part listing. No REACH, AEC-Q100, lead-free or halogen-free statements are published for this exact MPN in the available listings; use the -V grade option if an automotive-qualified variant is required and confirm the status with the manufacturer documentation.
