LAN9355/ML - 3-Port 10/100 Managed Ethernet Switch | Microchip
MPN： LAN9355/ML ✓ 啟用中LAN9355/ML 概覽
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.
直接替換替代品，適用於 LAN9355/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。
此系列的變體
與下列產品可直接替換的同系列型號： LAN9355/ML （相同外形與佔位） — 差異在於 Package, Switching Architecture.
此產品無可直接替換的替代品。
申請替代品LAN9355/ML 最大額定值與電氣特性
| Product Type | 3-port managed Ethernet switch |
| Ethernet Ports | 3 |
| Data Rate Support | 10 Mbps and 100 Mbps |
| PHY Type | 10/100 Base-T/TX PHY |
| Host Interface | I2C |
| Additional Host Interfaces | MII, RMII, and Turbo MII |
| Supply Voltage Range | 1.8 V to 3.3 V |
| 封裝 | 88-QFN, 12 x 12 mm |
| 安裝類型 | Surface Mount |
| Application Segments | Consumer, embedded, and industrial electronic designs |
| Switching Architecture | Managed Ethernet switch |
| Interface Control | I2C interface |
| Data Standards | 10/100 Ethernet |
LAN9355/ML 88-qfn, 12 x 12 mm 腳位配置指南
LAN9355/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： LAN9355/ML.
請參閱 資料表 以查看完整腳位配置。
典型應用
LAN9355/ML 適用於 6 應用s: Industrial control gateways, Embedded network appliances, Consumer connected equipment, Test and measurement instruments, Building and facility controllers, Network equipment service ports.
Industrial control gateways
The LAN9355/ML fits industrial control gateways that need several wired Ethernet links without adding separate PHY components. Its 3-port managed-switch architecture can connect an upstream network, an internal controller, and a service or management endpoint. The 10 Mbps and 100 Mbps rates are appropriate for supervisory control, configuration interfaces, HMI systems, and factory equipment where deterministic local connectivity matters. The I2C interface provides a control path for embedded firmware, while the 88-QFN 12 x 12 mm package helps preserve PCB area. Before layout, verify the exact transceiver configuration, clock requirements, electrical protection, and the device's operating-temperature limits in the official Microchip datasheet.
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Embedded network appliances
The LAN9355/ML is suitable for embedded network appliances that need multiple Fast Ethernet connections in a compact controller design. A three-port arrangement can support an external uplink plus two internal links, reducing the number of separate network interfaces on a higher-level processor. Its managed-switch function gives the host software visibility and control rather than limiting the design to basic frame forwarding. MII, RMII, and Turbo MII support lets the system choose a host-side architecture based on processor capabilities and board constraints. Validate the selected interface's clocking, pin multiplexing, and driver requirements against the manufacturer documentation.
推薦
Consumer connected equipment
The LAN9355/ML can support consumer products that require wired Ethernet alongside an embedded control system. For example, a digital appliance or media device may use one port for an external network connection and another for internal service traffic. The integrated 10/100 PHYs reduce the component count associated with multiple copper Ethernet connections, while the small 12 x 12 mm QFN package supports compact assemblies. The I2C management interface can be useful for configuration and status monitoring, but firmware must be designed around the exact LAN9355 register and interrupt behavior. Confirm EMC, isolation, and environmental requirements before using the device in a finished consumer product.
推薦
Test and measurement instruments
The LAN9355/ML can fit test and measurement instruments that expose wired Ethernet for remote control, monitoring, or service access. A three-port managed switch can provide a front-panel network connection while reserving links for internal test modules or a service interface. The 10 Mbps and 100 Mbps rates are sufficient for many control-plane and configuration tasks, and the host interfaces allow the instrument's processor to select a suitable Ethernet attachment method. Use careful isolation and grounding practices when connecting external copper ports. The supplied data does not provide EMC test levels, temperature limits, or automotive qualification, so use the official datasheet to determine whether the part meets the instrument's environmental requirements.
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Building and facility controllers
The LAN9355/ML is applicable to building controllers that connect sensors, room equipment, and a supervisory network. Its managed 3-port Ethernet capability can support upstream connectivity, a local controller, and an auxiliary monitoring device while retaining a compact PCB footprint. The I2C interface allows the controller firmware to configure or monitor switch behavior, and 10/100 Ethernet rates are appropriate for building-control traffic that is not dominated by high-bandwidth video. In this application, cable surge events and grounding are important implementation concerns. The verified web data does not specify transient ratings or operating temperature, so both [DATA_NEEDED: Ethernet transient immunity ratings] and [DATA_NEEDED: operating temperature range] must be resolved before field deployment.
推薦
Network equipment service ports
The LAN9355/ML can be used in network equipment that needs several 10/100 Ethernet service or management ports alongside a main processor. The managed-switch function allows firmware to control frame handling and network behavior, while the compact 88-QFN 12 x 12 mm package helps maintain a dense layout. Its host-interface choices can simplify integration with processors that support MII, RMII, or Turbo MII. Designers should budget PCB area for the required clocking, decoupling, Ethernet magnetics or transceiver connections, and test points. Because the supplied results do not confirm the exact regulator or transceiver implementation, the component should be selected only after the complete reference design and datasheet requirements have been reviewed.
推薦
推薦產品摘要
工程參考資料，適用於 LAN9355/ML — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Package | 88-QFN, 12 x 12 mm |
| Brand | Microchip Technology |
| Ethernet Port Count | 3 ports |
| Supported Data Rates | 10 Mbps and 100 Mbps |
| Interface | I2C |
| Host Interfaces | MII, RMII, and Turbo MII |
| Supply Voltage | 1.8 V to 3.3 V |
| Management | Managed Ethernet switch |
| Application Segments | Consumer, embedded, and industrial designs |
| Reference Price | $2.9774 as of 2026-10-22 |
主要差異化特點
- Integrated three-port managed Ethernet switching (對比W5100)
- Multiple host-side interface formats (對比KSZ8001LI)
- Compact 88-QFN integration (對比LAN9252I/PT)
設計說明
Before committing the PCB, assign the LAN9355/ML's Ethernet, clock, control, and power pins from the official package drawing rather than from the distributor package name alone. Keep the QFN footprint within the manufacturer's land-pattern rules, provide adequate escape routing for the 88 terminals, and confirm exposed-pad or thermal-via requirements directly from the datasheet. The verified data confirms the 88-QFN 12 x 12 mm package but does not provide the complete pinout.
The confirmed 1.8 V to 3.3 V supply range should be decomposed into the specific rails required by the Ethernet PHYs, digital core, and host interfaces. Follow the manufacturer requirements for decoupling, sequencing, and external power-supply startup. Do not use a generic regulator selection from this page alone; current limits, tolerance, noise, and load-transient behavior remain [DATA_NEEDED: supply current] until confirmed from the official datasheet.
Plan Ethernet traces and clock connections as a controlled interface rather than as ordinary low-speed digital signals. Match the manufacturer-referenced topology, keep clock and data routing topology consistent, control return paths, and reserve test points for signal integrity and compliance testing. MII, RMII, and Turbo MII have different timing and clocking constraints, so select the host mode early and validate the chosen interface against the processor datasheet.
Do not treat a distributor listing as a substitute for the complete LAN9355/ML datasheet. Confirm the exact suffix, package, temperature grade, supported host mode, PHY/magnetics architecture, and electrical limits before release. The supplied cross-reference search did not identify a verified drop-in replacement, so LAN9355/ML should not be substituted based only on similar Ethernet-switch descriptions or an assumed compatible footprint.
合規資訊
The supplied verified data does not state RoHS, REACH, lead-free, halogen-free, or conflict-mineral status for LAN9355/ML. AEC-Q100 is recorded as not_applicable because no automotive qualification claim was provided; confirm compliance using the current manufacturer product documentation before procurement.
