LAN9355/ML - 3-Port 10/100 Managed Ethernet Switch | Microchip
MPN: LAN9355/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.9774 | $2.98 |
| 10 | $2.9774 | $29.77 |
| 100 | $2.9774 | $297.74 |
| 500 | $2.9774 | $1,488.70 |
| 1,000 | $2.9774 | $2,977.40 |
LAN9355/ML Overview
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.
Drop-in alternatives for LAN9355/ML — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesLAN9355/ML Maximum Ratings & Electrical Characteristics
| 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 |
| Package | 88-QFN, 12 x 12 mm |
| Mounting Type | 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 Pin Configuration Guide
Pin configuration for LAN9355/ML (88-qfn, 12 x 12 mm package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for LAN9355/ML.
Refer to the datasheet for full pin configuration.
Typical Applications
LAN9355/ML is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for LAN9355/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| 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 |
Key Differentiators
- Integrated three-port managed Ethernet switching (vs W5100)
- Multiple host-side interface formats (vs KSZ8001LI)
- Compact 88-QFN integration (vs LAN9252I/PT)
Design Notes
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.
Compliance Information
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.
