LAN9355T/ML - 3-Port Managed Ethernet Switch | Microchip
MPN： LAN9355T/ML ✓ 啟用中LAN9355T/ML 概覽
An Ethernet switch is a networking semiconductor that connects multiple physical Ethernet ports and manages frame forwarding between them. The LAN9355 combines three-port switching, 10/100 Base-T/TX physical-layer functionality, and I2C control in one package. This integration can reduce the number of separate network components required on an embedded system while preserving a small PCB footprint.
The Microchip LAN9355 family is described by the manufacturer as a high-performance, small-footprint, full-featured 3-port managed Ethernet switch. Its application optimization targets consumer, embedded, and industrial equipment. The I2C interface provides a control path for system integration, while the 88-QFN package supports surface-mount assembly and compact board layouts.
The target designation LAN9355T/ML identifies the production configuration, and the verified distributor listing identifies the device as an Ethernet switch with 10/100 Base-T/TX PHY and I2C interface. The manufacturer product page also distinguishes LAN9355 and LAN9355i variants within the family, so engineers should verify the exact variant and ordering information before releasing a design.
Typical uses include industrial control equipment, embedded gateways, consumer networking products, and compact communication modules. In these systems, the switch can provide Ethernet connectivity among local processors, sensors, service interfaces, and external network equipment. Actual media-rate, cable-length, power, and interface limits should be confirmed in the manufacturer datasheet for the selected system configuration.
PCB implementation should follow the manufacturer’s recommended land pattern and decoupling layout. Keep high-speed Ethernet differential routes short, preserve the specified pair geometry, provide a continuous ground reference, and isolate switching or clock sources from sensitive data paths. The 12 x 12 mm package also requires thermal and assembly planning appropriate for a 88-lead QFN design.
This product page combines manufacturer positioning, package and interface facts, sourcing guidance, alternative-part evaluation criteria, and practical integration notes. It also highlights where engineers should consult the official datasheet and errata before a new LAN9355 hardware design enters validation.
直接替換替代品，適用於 LAN9355T/ML — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品LAN9355T/ML 最大額定值與電氣特性
| Device Type | 3-port managed Ethernet switch |
| Number of Ethernet Ports | 3 ports |
| Ethernet Data Rate | 10/100 Base-T/TX |
| Physical Layer Support | Integrated 10/100 Base-T/TX PHY |
| Control Interface | I2C |
| 封裝 | 88-QFN (12 x 12 mm) |
| Lead Count | 88 leads |
| 安裝類型 | Surface mount |
| Product Category | Ethernet interface integrated circuit |
| Application Markets | Consumer, embedded, and industrial electronic designs |
| Management Architecture | Managed Ethernet switch |
| Ethernet Media Support | Base-T/TX |
| Supplier Interface Classification | I2C interface |
LAN9355T/ML 88-qfn (12 x 12 mm) 腳位配置指南
LAN9355T/ML（88-qfn (12 x 12 mm) 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： LAN9355T/ML.
請參閱 資料表 以查看完整腳位配置。
典型應用
LAN9355T/ML 適用於 6 應用s: Embedded Ethernet Gateway, Industrial Control Equipment, Consumer Network Appliance, Programmable Logic Communication Module, IoT Edge Controller, Test and Measurement Front End.
Embedded Ethernet Gateway
The LAN9355T/ML fits an embedded gateway that must consolidate several wired endpoints into a compact network interface. Its three 10/100 Base-T/TX ports can connect local control hardware, service equipment, and an upstream network path, while the managed-switch and I2C interfaces support controlled integration into the host system. The 88-QFN, 12 x 12 mm package limits board area compared with several discrete network components. During schematic design, verify the supported PHY configuration, required magnetics or network interface arrangement, supply rails, and clock requirements against the official datasheet.
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Industrial Control Equipment
The LAN9355T/ML is suitable for compact industrial control equipment that needs local 10/100 Ethernet connectivity alongside a management processor. Three ports allow separate controller, operator-interface, and service-network connections, while I2C control can provide a hardware-level management path. The managed Ethernet switch architecture is more useful than a basic repeater when local traffic must be segmented or configured. Before production release, verify operating-temperature requirements, isolation strategy, EMC considerations, external Ethernet components, and error-recovery behavior in the manufacturer documentation.
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Consumer Network Appliance
The LAN9355T/ML can support a consumer networking appliance that exposes multiple wired Ethernet connections from a main processor or embedded controller. Its three 10/100 ports suit products with limited throughput requirements but several physical network access points, and its small 12 x 12 mm 88-QFN package supports compact board construction. The I2C interface permits host-driven setup of supported switch functions. Validate the product’s boot sequence, management firmware, indicator-control requirements, thermal environment, and cable compatibility, then check any relevant errata before production.
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Programmable Logic Communication Module
The LAN9355T/ML is appropriate for a communication module that needs three managed 10/100 Ethernet connections in a limited PCB area. An FPGA or processor can use the I2C interface for configuration while the switch handles local Ethernet traffic among module interfaces. This arrangement is useful in test equipment, data-acquisition equipment, and industrial communication modules where several external devices must connect through one assembly. Confirm that the host processor supports the required initialization and management protocol, then preserve controlled pair geometry, continuous grounding, and manufacturer-recommended component placement.
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IoT Edge Controller
The LAN9355T/ML can be used in an IoT edge controller that bridges wired sensors, local actuators, and a backhaul network. Three 10/100 Base-T/TX ports provide connectivity for distributed devices, while managed switching and I2C configuration support integration with an embedded Linux, RTOS, or microcontroller-based host. The compact 88-QFN package helps preserve board space for sensing and radio functions. Validate startup sequencing, cable insertion behavior, thermal performance, and the exact external Ethernet interface requirements before integrating the device into a high-volume IoT product.
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Test and Measurement Front End
The LAN9355T/ML is a candidate for test and measurement front ends that need multiple instrument or service connections behind a managed Ethernet switch. The three-port architecture can separate a control computer, test node, and auxiliary service link, while I2C gives the instrument controller a means to initialize supported network functions. A compact 12 x 12 mm QFN is useful where front-panel electronics, analog sections, and communication circuitry share limited PCB space. Confirm galvanic isolation needs, conducted-emissions requirements, supported media, and startup behavior in the manufacturer datasheet.
推薦
推薦產品摘要
工程參考資料，適用於 LAN9355T/ML — 比較、設計指引及合規資訊。
選型指南
設計說明
Use the official LAN9355 mechanical drawing and land pattern for the 88-QFN footprint. Verify exposed-pad dimensions, thermal-via recommendations, and solder-mask clearance against the package drawing. Confirm the pin-description table before assigning tracks; an 88-QFN footprint cannot be safely inferred from generic QFN libraries.
Preserve the Ethernet differential-pair geometry recommended by Microchip and route each pair over a continuous reference plane. Keep the switching and magnetics area away from sensitive analog circuitry, minimize stubs, and follow the documented component-placement sequence. Review the LAN9355 errata before releasing high-volume production layouts.
Confirm every required supply rail, decoupling value, and power-sequence condition in the official datasheet. Place required capacitors close to their associated pins and provide clean returns through the package ground and exposed-pad connections. Validate startup and shutdown behavior across worst-case supply combinations rather than relying only on nominal operating conditions.
Do not treat LAN9353T/ML as a confirmed substitute for LAN9355T/ML. The cross-reference information does not establish identical package dimensions, pin assignments, port architecture, or management features. A replacement requires direct comparison of the manufacturer pin tables, electrical characteristics, external circuitry, and package drawings.
Estimate junction temperature using the actual LAN9355 power dissipation, package thermal data, copper area, airflow, and the highest expected ambient temperature. Provide thermal vias and adequate exposed-pad copper where the manufacturer recommends them. Validate under worst-case traffic because continuous Ethernet activity can change device heating between laboratory and operating conditions.
合規資訊
Compliance status was not identified in the manufacturer product-page or distributor information. Confirm environmental, automotive, and material declarations through Microchip’s product documentation and quality documents before production release.
