LAN9355TI/PT - 3-Port 10/100 Managed Ethernet Switch
料号： LAN9355TI/PT ✓ 量产中直接替换替代料： LAN9355TI/PT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LAN9355TI/PT （相同外形与封装尺寸） ——差异在于 Package, Host Interface, Number of Ports.
LAN9355/PT
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →LAN9355I/PT
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →LAN9355TI/PT 最大额定值与电气特性
| Device Type | 3-port managed Ethernet switch |
| Ethernet Data Rate | 10/100 Base-T/TX |
| Number of Ports | 3 ports |
| Management Interface | I2C |
| Host Interface | Dual MII/RMII/Turbo MII |
| Supply Voltage Range | 1.8 V to 3.3 V |
| 工作温度范围 | -40°C to +85°C |
| 封装 | 80-TQFP-EP, 12 mm × 12 mm |
| Exposed Pad | Yes |
| 安装类型 | Surface mount |
| Packaging Type | Tape & Reel (TR) |
| Product Category | Ethernet switch controller |
| Target Applications | Consumer, embedded, and industrial electronics |
LAN9355TI/PT 80-tqfp-ep, 12 mm × 12 mm 引脚配置指南
LAN9355TI/PT（80-tqfp-ep, 12 mm × 12 mm 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： LAN9355TI/PT.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LAN9355TI/PT 适用于 6 应用s: Embedded Linux Network Appliance, Industrial Ethernet Gateway, Smart Building Controller, Consumer Network Appliance, Automated Test Equipment, Industrial Sensor Hub.
Embedded Linux Network Appliance
The LAN9355TI/PT fits an embedded Linux appliance that needs multiple 10/100 Ethernet connections without a separate switch ASIC. Its three integrated ports reduce board area and component count, while the I2C management path supports configuration alongside a processor bus interface. The 1.8 V to 3.3 V operating range accommodates common embedded processor rails. Designers must align the selected MII, RMII, or Turbo MII mode with the SoC, provide compliant clocking and reset behavior, and verify Linux driver support for the board's PHY address and interrupt arrangement.
推荐
Industrial Ethernet Gateway
The LAN9355TI/PT is appropriate for an industrial gateway operating from -40°C to +85°C and requiring three 10/100 ports for local equipment, sensors, or service networks. Its integrated managed-switch architecture can reduce the number of discrete network components compared with separate PHY implementations. Industrial qualification of the finished product remains a system-level activity. The PCB should provide adequate exposed-pad grounding, isolated high-impedance copper routing for magnetics, robust input power filtering, and verified surge protection where required by the installation environment.
推荐
Smart Building Controller
The LAN9355TI/PT can provide three wired 10/100 links in a smart-building controller that connects to lighting, access, or environmental equipment. The compact 80-pin TQFP exposed-pad package helps preserve board space compared with a discrete switching solution. The I2C interface provides a management path, while the configurable host interface allows connection to an embedded processor. Because building controllers can experience long cable runs and noisy power environments, use compliant Ethernet magnetics, solid grounding, isolated cable interfaces, and firmware recovery provisions that prevent a configuration fault from taking the entire network offline.
推荐
Consumer Network Appliance
The LAN9355TI/PT suits a compact consumer appliance that needs to present multiple 10/100 connections through one host processor. Integrating switching can shorten board routing and reduce the number of components compared with adding a standalone three-port switch. The processor must supply the required MII/RMII/Turbo MII clocking, while the design must account for the exposed pad during assembly and enclosure design. Firmware should expose the port configuration, link status, and error recovery through a practical user interface so installation technicians can diagnose cable or port faults without specialized equipment.
推荐
Automated Test Equipment
The LAN9355TI/PT can support automated test equipment that requires three independent 10/100 network connections for instrument control, fixture networking, and service access. Integrating the switch into the controller board can simplify the control topology and reduce external network hardware. The host interface timing and clock sources must remain deterministic, and the layout must keep Ethernet differential pairs controlled and separated from noisy power and switching circuitry. Validate link auto-negotiation, recovery after link loss, and sustained traffic at the temperature extremes expected by the equipment specification.
推荐
Industrial Sensor Hub
The LAN9355TI/PT is useful in an industrial sensor hub that aggregates several wired sensor or service connections while operating across -40°C to +85°C. Three integrated 10/100 ports provide network segmentation without a separate switch board, and the small exposed-pad TQFP can fit a compact controller assembly. The design should include robust Ethernet magnetic coupling, surge-resistant interfaces, controlled power filtering, and careful separation between Ethernet routing and sensor analog sections. Firmware should monitor link status and provide controlled recovery so a disconnected peripheral cannot cause unnecessary service interruptions elsewhere on the hub.
推荐
推荐产品汇总
工程参考数据： LAN9355TI/PT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LAN9355/PT | LAN9355I/PT |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 80-TQFP-EP (12 mm × 12 mm) | 80-TQFP-EP (12 mm × 12 mm) - same | 80-TQFP-EP (12 mm × 12 mm) - same |
| Device Type | Managed Ethernet switch | Managed Ethernet switch | Managed Ethernet switch |
| Number of Ports | 3 ports | 3 ports | 3 ports |
| Ethernet Data Rate | 10/100 Base-T/TX | 10/100 Base-T/TX | 10/100 Base-T/TX |
| Management Interface | I2C | I2C | I2C |
| Host Interface | Dual MII/RMII/Turbo MII | Dual MII/RMII/Turbo MII | Dual MII/RMII/Turbo MII |
| Supply Voltage Range | 1.8 V to 3.3 V | 1.8 V to 3.3 V | 1.8 V to 3.3 V |
关键差异点
- Integrated three-port managed switching （对比 LAN9355/PT)
- Industrial-temperature ordering option （对比 LAN9355I/PT)
- Compact integrated network interface （对比 LAN9355/PT)
设计说明
Treat the exposed pad as a required thermal and ground connection. Place a full-size ground-pad footprint under the package, retain the manufacturer-recommended solder mask and paste pattern, and provide nearby via stitching into the ground plane. Estimate the junction rise from total dissipation and the effective board thermal resistance, then compare the resulting junction temperature with the device limit of +85°C for the -40°C to +85°C grade.
Use the manufacturer's reference layout and pin-description table when assigning the 80-pin TQFP signals. Keep the MII/RMII/Turbo MII host traces short and controlled, isolate Ethernet differential pairs from switching nodes and high-current paths, and avoid routing them across the exposed-pad ground area. Confirm PHY address, strap, reset, reference-clock, and interrupt assignments before routing because incorrect configuration straps can change the interface behavior at power-up.
Place local supply-decoupling capacitors at the appropriate power pins using the values and placement specified in the manufacturer datasheet. Keep supply and ground planes continuous through the switching core, and verify startup sequencing when the host processor and Ethernet magnetics use different rails. Use the manufacturer's guidance for unused outputs, clock sources, and reset behavior; incorrect sequencing or an unclocked interface can prevent the switch from initializing reliably.
合规信息
No specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status was identified for this exact ordering code. AEC-Q100 is recorded as not applicable because LAN9355TI/PT is an industrial Ethernet switch rather than an automotive-qualified device.
