LAN9355T/PT - 3-Port 10/100 Ethernet Switch | Microchip
N.º da peça: LAN9355T/PT ✓ AtivoLAN9355T/PT Visão geral
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.
Alternativas drop-in para LAN9355T/PT — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Nenhuma alternativa drop-in disponível para este produto.
Solicitar alternativasLAN9355T/PT Classificações máximas e características elétricas
| Product Type | Managed Ethernet switch with integrated PHY |
| Number of Ports | 3 ports |
| Supported Ethernet Speeds | 10 Mbps and 100 Mbps |
| Physical Layer Interface | 10/100 Base-T/TX |
| Management Interface | I2C |
| Integrated PHY Count | 3 integrated 10/100 PHYs |
| Encapsulamento | 80-pin TQFP exposed-pad, 12 mm x 12 mm |
| Tipo de montagem | Surface mount |
| Packaging | Tape and reel |
| Target Applications | Consumer, embedded, and industrial electronic designs |
| Maximum Ethernet Link Rate | 100 Mbps per port |
Guia de Configuração de Pinos do LAN9355T/PT 80-pin tqfp exposed-pad, 12 mm x 12 mm
Configuração de pinos para LAN9355T/PT (pacote 80-pin tqfp exposed-pad, 12 mm x 12 mm). A numeração dos pinos, funções e diagramas de conexão estão definidos no datasheet do fabricante. Consulte-o para o footprint exato e diretrizes de soldagem.
Nenhum dado detalhado de pinagem disponível para LAN9355T/PT.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
LAN9355T/PT é adequado para 6 aplicaçãos: Industrial Automation Ethernet Gateway, Embedded Control Platform, Automotive Network Hub, Consumer Networking Hub, Machine Vision Camera Interface, Remote Sensor Network Concentrator.
Industrial Automation Ethernet Gateway
The LAN9355T/PT fits industrial gateways that must combine a supervisory controller with field devices over Fast Ethernet. Its three 10/100 ports can support a controller-side link, an instrumentation network, and an uplink without requiring separate Ethernet switch silicon at each connection point. The integrated 10/100 Base-T/TX PHYs reduce the number of copper-interface blocks in the design. Use the I2C management interface for configuration, status monitoring, and board-level diagnostics, while preserving sufficient layout separation for industrial cabling and surge-protection requirements. The 80-pin TQFP exposed-pad package still requires careful thermal design and controlled Ethernet routing.
Recomendado
Embedded Control Platform
LAN9355T/PT is appropriate for embedded control platforms that need to expose Ethernet connectivity through a host processor or microcontroller. The three-port managed switch allows a local debug port, an external machine connection, and an uplink to be consolidated into a small controller design. Each port supports 10 Mbps and 100 Mbps operation, while the I2C interface provides a management path independent of the principal data traffic. In implementation, verify the controller’s I2C electrical limits, assign addresses carefully, and follow the reference clock and reset requirements. Ethernet differential routing and the exposed-pad land pattern must follow Microchip’s layout guidance to preserve signal and thermal performance.
Recomendado
Automotive Network Hub
The LAN9355T/PT can support compact automotive Ethernet-hub concepts that distribute Fast Ethernet connectivity among local control modules. Its three integrated 10/100 ports reduce the physical interface burden when a module needs multiple network links, and the managed-switch architecture provides a structured base for traffic control and status monitoring. Automotive deployment requires confirmation of the exact temperature grade, qualification status, transient immunity, and fault behavior; these attributes must be checked against the manufacturer documentation rather than inferred from the package. PCB implementations should include appropriate power distribution, ground partitioning, and Ethernet routing while avoiding unprotected external connections.
Recomendado
Consumer Networking Hub
LAN9355T/PT is suitable for compact consumer networking products that require three 10/100 ports with integrated physical layers. A small home hub, media bridge, or connected peripheral can use the managed-switch architecture to combine several Fast Ethernet links while minimizing external PHY count. The 12 mm by 12 mm TQFP exposed-pad package supports integration where board area is constrained. Product developers should implement the manufacturer’s startup, clock, and decoupling recommendations and validate compliance with the Ethernet interface requirements applicable to the finished product. Firmware and network-management behavior should also be tested against the intended user experience rather than treating Ethernet link establishment as sufficient system validation.
Recomendado
Machine Vision Camera Interface
LAN9355T/PT can serve as the network-switching element in a compact machine-vision endpoint that connects a camera, image-processing controller, and maintenance interface over Fast Ethernet. The three-port arrangement provides a practical topology for a camera input, local processing link, and uplink while retaining 100 Mbps maximum link rate. Integrated PHYs simplify the camera’s network implementation, although image bandwidth must be checked against sustained frame rate and packet overhead. Use controlled-impedance differential routing, solid return paths, and isolated or protected external connectors as required by the installation environment. The I2C interface can assist with board-level status monitoring without consuming the Ethernet data paths.
Recomendado
Remote Sensor Network Concentrator
LAN9355T/PT is appropriate for a sensor-network concentrator that aggregates multiple Fast Ethernet endpoints before forwarding traffic to a broader network. Three managed 10/100 ports can connect sensor controllers, a service interface, and an uplink while reducing the need for discrete switching components. The I2C management path allows a supervisory processor to inspect network status and coordinate startup. Designers should account for cable length, magnetics, isolation, and connector requirements imposed by the installation, then test link behavior across supported 10 Mbps and 100 Mbps modes. A controlled four-layer stack-up is preferable when the board must combine Ethernet routing with measurement, isolation, or power-conversion circuitry.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LAN9355T/PT — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto |
|---|---|
| Brand | Microchip Technology |
| Package | 80-pin TQFP exposed pad, 12 mm x 12 mm |
| Port Count | 3 ports |
| Supported Ethernet Speeds | 10 Mbps and 100 Mbps |
| Integrated PHY | 3 integrated 10/100 Base-T/TX PHYs |
| Management Interface | I2C |
| Device Type | Managed Ethernet switch |
| Packaging | Tape and reel |
Principais diferenciais
- Integrated three-port managed switching (vs Generic discrete Ethernet interface implementation)
- Managed Fast Ethernet integration (vs Single-channel or unmanaged PHY-based implementation)
- Compact application-oriented integration (vs Multi-chip Fast Ethernet design)
Notas de projeto
Implement the Ethernet section on a controlled-impedance PCB and follow the Microchip reference layout for the 80-pin TQFP exposed-pad package. Keep the 10/100 Base-T/TX differential pairs short, symmetrical, and continuously referenced to the correct ground plane. Avoid placing noisy switching regulators, high-current LED drivers, or isolation barriers directly beneath the PHY routing where their return currents could disturb the differential signals.
Connect the exposed pad to the ground plane with the maximum practical number of thermal-via connections allowed by the PCB stack-up and manufacturer land pattern. The exposed pad provides the principal vertical heat path, while top- and bottom-side copper improve heat spreading. Estimate the local regulator dissipation from the actual input voltage, output voltage, and port-loading conditions, then confirm that the resulting junction-temperature margin is adequate at the maximum ambient temperature.
Separate the Ethernet PHY and switching region from analog, RF, and high-current power circuitry. Use a continuous ground reference beneath the switch and its decoupling network, place input and output capacitors directly at their associated supply pins, and route clock and management signals away from Base-T/TX pairs. The I2C management bus must also be reviewed for pull-up placement so that slow edges and ringing do not compromise control reliability.
Do not treat the LAN9353T/PT, a generic Ethernet PHY, or another three-port switch as a drop-in substitute solely because its application description is similar. A valid replacement for LAN9355T/PT requires an exact 80-pin TQFP exposed-pad footprint, matching pin assignments, compatible 10/100 PHY behavior, equivalent I2C management, and acceptable system firmware dependencies. Obtain manufacturer documentation before authorizing a substitution.
Informações de conformidade
RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals status were not identified in the available product information. Confirm these requirements against the Microchip LAN9355 family documentation and the exact ordering code before production release.
