LAN9352TI/PT - 2-Port 10/100 Managed Ethernet Switch | Microchip
MPN: LAN9352TI/PT ✓ ActiveLAN9352TI/PT Overview
An Ethernet switch is a semiconductor device that connects multiple nodes on a local network and manages frame forwarding between ports. The managed designation indicates that port behavior can be configured rather than operating only as a simple physical-layer repeater. Within the product hierarchy, the LAN9352TI/PT is a two-port managed Ethernet switch with integrated PHYs, a network-interface controller, and configurable general-purpose I/O functions.
Key features include two integrated 10/100 Base-T/TX PHY ports, a 16-bit non-PCI SPI/SQI interface, I2C and SPI host connectivity, and multifunction GPIOs. The single 3.3 V supply architecture simplifies board-level power planning, while the internal 1.2 V regulator supports the core circuitry. A low-cost 25 MHz crystal can be used where the corresponding clocking configuration is supported, helping reduce the external component count.
The LAN9352TI/PT is designed for designs that require two wired-network connections without allocating a discrete PHY and switch controller for each port. Its 80-lead TQFP-EP package exposes the Ethernet magnetics interfaces, power rails, host interface, clocks, management signals, and multifunction GPIOs through a single surface-mount footprint. The exposed pad supports improved thermal dissipation when the board provides adequate copper and thermal via coverage.
Typical applications include industrial control equipment, embedded gateways, factory monitoring systems, building automation controllers, set-top equipment, printers, and other products that connect embedded logic to 10/100 Ethernet networks. Because the device is managed, software can configure operational parameters and monitor port activity through its host-accessible control interfaces.
For PCB design, place the Ethernet magnetics and the device according to the high-speed layout guidance in the manufacturer reference design, route differential pairs as controlled-impedance nets, and provide the decoupling network specified for each supply rail. Treat the exposed pad as a thermal and electrical connection to the ground-plane strategy, and validate final magnetics and isolation-component selections against the target cable length and regulatory requirements.
This page consolidates device specifications, verified sourcing links, application guidance, and a compatibility-focused comparison framework. It also identifies where the 80-lead TQFP-EP package differs from the 72-lead QFN option in the same LAN9352 family, helping designers confirm land-pattern reuse before committing to a PCB revision.
Drop-in alternatives for LAN9352TI/PT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LAN9352TI/PT (same form factor and footprint) — differing in Integrated PHY, Package.
No drop-in alternatives available for this product.
Request AlternativesLAN9352TI/PT Maximum Ratings & Electrical Characteristics
| Product Type | 2-port managed Ethernet switch |
| Number of Ethernet Ports | 2 ports |
| Ethernet Speed | 10/100 Base-T/TX |
| Integrated PHY | 2 integrated 10/100 Base-T/TX PHYs |
| Host Interface | 16-bit non-PCI SPI/SQI |
| Control Interfaces | I2C and SPI |
| General-Purpose I/O | Multifunction GPIOs |
| Supply Voltage | 3.3 V |
| Internal Regulator Output | 1.2 V integrated |
| Crystal Option | 25 MHz low-cost crystal supported |
| Package | 80-lead TQFP-EP |
| Package Body Size | 12 x 12 mm |
| Family Package Options | 72-pin QFN or 80-pin TQFP-EP |
| Mounting Type | Surface mount |
| Temperature Grade Options | Commercial and industrial temperature ranges |
| Lead-Free Status | Pb-free |
| RoHS Status | RoHS compliant |
| Maximum Ethernet Link Rate | 100 Mbps per port |
| Ethernet Media Support | 10/100 Base-T/TX |
LAN9352TI/PT 72-pin qfn or 80-pin tqfp-ep Pin Configuration Guide
Pin configuration for LAN9352TI/PT (72-pin qfn or 80-pin tqfp-ep 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 LAN9352TI/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
LAN9352TI/PT is suitable for 6 applications: Industrial Ethernet Gateways, Factory Monitoring Equipment, Building Automation Controllers, Embedded Network Printers, Consumer Media and Network Appliances, Robotics and Machine Vision Systems.
Industrial Ethernet Gateways
The LAN9352TI/PT fits industrial gateways that must bridge a local controller to two 10/100 networks. Its two integrated Base-T/TX PHYs eliminate separate PHY components, while the 16-bit non-PCI SPI/SQI interface lets a host processor monitor and configure the switch. Operating from a single 3.3 V rail simplifies system power distribution, and the managed architecture supports port-level software control for diagnostic and traffic-management functions.
Recommended
Factory Monitoring Equipment
The LAN9352TI/PT can connect monitoring controllers and programmable equipment to two wired-network segments in a factory. Its integrated 10/100 PHYs provide a compact implementation for data acquisition, condition monitoring, and remote diagnostics. The managed switch functions allow the host software to observe port status, while multifunction GPIOs can support board-level control or status signaling. The single 3.3 V supply architecture reduces the number of board-level rails.
Recommended
Building Automation Controllers
The LAN9352TI/PT is appropriate for building-automation controllers that need two Ethernet connections for upstream supervisory networks and local equipment. The managed port architecture permits host software to configure switching behavior and report link conditions, while the SPI/SQI host interface supports integration with an embedded application processor. The 12 x 12 mm TQFP-EP package also leaves room for isolation components and magnetic circuitry in a space-conscious control panel design.
Recommended
Embedded Network Printers
The LAN9352TI/PT can serve as the two-port network interface in an embedded printer or imaging appliance. One port may connect to an internal imaging subsystem while the other provides an external network uplink, and the managed switch allows the printer controller to observe connectivity. Its single 3.3 V supply and integrated PHYs reduce board complexity compared with a discrete switch-and-PHY arrangement, supporting compact consumer and office-equipment designs.
Recommended
Consumer Media and Network Appliances
The LAN9352TI/PT suits set-top, media, and home-network appliances that require two managed 10/100 ports and a host-accessible switching function. Its 16-bit non-PCI SPI/SQI interface avoids requiring a PCI peripheral bus, allowing connection to a simpler embedded processor. The integrated 1.2 V regulator supports the internal core from a 3.3 V board supply, and the multifunction GPIOs add control signals without requiring separate logic devices.
Recommended
Robotics and Machine Vision Systems
The LAN9352TI/PT can provide dual-port networking in robot controllers and machine-vision systems where an embedded processor communicates with cameras, sensors, or service equipment. Two integrated PHYs allow both local high-speed data exchange and plant-network access on one controller board. The managed switching capability supports port monitoring, while the non-PCI SPI/SQI host connection fits processors that lack a conventional PCI peripheral interface.
Recommended
Recommended Products Summary
Engineering reference data for LAN9352TI/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 80-lead TQFP-EP, 12 x 12 mm |
| Brand | Microchip Technology |
| Ethernet Ports | 2 |
| Ethernet Speed | 10/100 Base-T/TX |
| Host Interface | 16-bit non-PCI SPI/SQI |
| Control Interfaces | I2C and SPI |
| Supply Voltage | Single 3.3 V |
| Internal Regulator | Integrated 1.2 V |
| Multifunction GPIO | Supported |
| RoHS Status | RoHS compliant, Pb-free |
Key Differentiators
- Two integrated PHYs with managed switching (vs Discrete switch-and-PHY implementation)
- Processor-friendly host architecture (vs PCI-based Ethernet interface design)
- Single-rail board power architecture (vs Multi-rail switch implementation)
- Space-conscious 12 x 12 mm footprint (vs 72-pin QFN LAN9352 package option)
Design Notes
Route each Ethernet differential pair as a controlled-impedance transmission line and keep the PHY-to-magnetics section as short as the manufacturer reference layout allows. Maintain the specified pair symmetry, avoid splitting the pair across plane boundaries, and keep switching regulators and high-current paths away from the differential signals. Confirm the final magnetics and isolation-device selection against the required cable length.
The TQFP-EP exposed pad is intended to improve thermal transfer from the device. Bond it to the ground plane with a thermal-via array sized for the device and PCB stack-up, while following the manufacturer pattern for via placement around the pad. Verify junction-temperature margin at the highest ambient temperature and the maximum switching activity expected from the managed Ethernet ports.
Implement separate input, output, and analog-side decoupling exactly as specified in the Microchip LAN9352 manufacturer reference design. Place each capacitor close to its intended supply pin to minimize loop area and high-frequency impedance. Because the device includes an internal 1.2 V regulator, use the documented external connection and bypass arrangement rather than adding an unnecessary second supply rail.
Do not substitute the 72-pin QFN LAN9352 package for the 80-lead TQFP-EP LAN9352TI/PT without redesigning the PCB. Verify the exact ordering code, lead count, exposed-pad connection, and every signal against the package-specific pin table. Also validate the 25 MHz crystal loading and startup conditions before replacing a reference oscillator with a lower-cost crystal source.
Compliance Information
The device is identified as Pb-free and RoHS compliant. No automotive qualification, REACH status, halogen-free declaration, or conflict-minerals statement is listed for this ordering option.
