LAN9311-NU - 2-Port 10/100 Managed Ethernet Switch | Microchip
料号： LAN9311-NU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $11.6992 | $11.70 |
| 10 | $11.35 | $113.50 |
| 100 | $10.85 | $1,085.00 |
| 500 | $10.2 | $5,100.00 |
| 1,000 | $9.75 | $9,750.00 |
LAN9311-NU 概述
An Ethernet switch controller is a semiconductor that combines media-access control, frame handling, port management, and physical-layer functions into an embedded networking solution. The LAN9311 belongs to the interface IC and Ethernet switch hierarchy, allowing equipment designers to connect processors, controllers, sensors, and industrial equipment through managed 10/100 Ethernet without implementing a discrete switching subsystem.
Verified features include a 32 Kbyte buffer RAM, a 1 K-entry forwarding table, and IEEE 802.1Q VLAN support with 16 groups. The switch also provides programmable quality-of-service support through four dynamic queues per port. Full-duplex and half-duplex operating modes are supported, giving designers flexibility across embedded infrastructure, industrial automation, and connected equipment.
The LAN9311-NU integrates two 10/100 Ethernet ports and combines switch management with a 16-bit non-PCI host interface for embedded processor connectivity. Its managed-switch functions include VLAN grouping, QoS prioritization, address learning through the 1 K-entry forwarding table, and frame buffering through 32 Kbyte of RAM. These features support deterministic traffic handling when multiple endpoints share the same two-port Ethernet segment.
Typical uses include industrial Ethernet gateways, embedded routers, set-top and communication equipment, factory-floor controllers, and networked measurement systems. A design can place the controller beside a processor and Ethernet magnetics, then use the host interface for configuration and status monitoring. The supplied LAN9311 reference schematic emphasizes placing bulk and low-ESR decoupling capacitors close to the specified power pins.
The main design consideration is interface and power integrity. Follow the manufacturer's reference schematic and 128-pin VTQFP placement checklist, especially the 49.9 ohm TX termination pull-up arrangement described for the second PHY interface. Confirm package routing, magnetics isolation, thermal performance, and all pin assignments against the manufacturer documentation before layout release.
This page consolidates verified distributor availability, package and interface details, cross-reference findings, comparison parameters, and practical LAN9311 layout guidance. It is intended to accelerate component selection and PCB planning while clearly separating confirmed specifications from data requiring a manufacturer datasheet review.
直接替换替代料： LAN9311-NU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
LAN9311-NZW
✅ 直接替换📋 参考替代料（不在目录中）
LAN9313-NU-TR
✅ 直接替换📋 参考替代料（不在目录中）
LAN9313-NZW-TR
✅ 直接替换📋 参考替代料（不在目录中）
LAN9311-NU 最大额定值与电气特性
| Product Type | 2-Port 10/100 Managed Ethernet Switch Controller |
| Number of Ethernet Ports | 2 ports |
| Ethernet Data Rate | 10 Mbit/s and 100 Mbit/s |
| Physical Layer Support | 10/100 Base-T/TX PHY |
| Host Interface | I2C interface; 16-bit non-PCI interface |
| Buffer RAM | 32 Kbyte |
| Forwarding Table | 1 K entries |
| VLAN Standard | IEEE 802.1Q |
| VLAN Groups | 16 groups |
| QoS | Programmable, 4 dynamic queues per port |
| Duplex Modes | Full duplex and half duplex |
| 电源电压 | 3.3 V |
| 封装 | 128-pin VTQFP, 14 x 14 mm |
| 安装类型 | Surface mount |
| Shipping Package | Tray |
| RoHS Compliance | EU RoHS compliant |
| REACH Compliance | REACH compliant |
LAN9311-NU tray 引脚配置指南
LAN9311-NU（tray 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： LAN9311-NU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LAN9311-NU 适用于 6 应用s: Industrial Ethernet Gateway, Embedded Network Controller, VLAN-Enabled Networked Equipment, Networked Measurement Instrument, Communication Equipment, Automated Factory Controller.
Industrial Ethernet Gateway
The LAN9311-NU fits industrial gateways that must connect local controllers or sensors to an upstream 10/100 network. Its two managed ports support 10 Mbit/s and 100 Mbit/s operation, while IEEE 802.1Q support across 16 groups allows equipment and service traffic to be separated logically on a shared infrastructure. Four dynamic QoS queues per port provide a mechanism for prioritizing selected traffic. The 16-bit non-PCI host interface connects the switch to an embedded processor without requiring a PCI bus. Before final qualification, verify the unprovided operating-temperature range, isolation requirements, and industrial EMC constraints.
推荐
Embedded Network Controller
The LAN9311-NU is appropriate for an embedded processor platform that needs two orderly Ethernet endpoints without implementing discrete switching silicon. A system can use one port for an internal device network and the other for an uplink, then control forwarding through the 16-bit non-PCI interface. The 1 K-entry forwarding table and 32 Kbyte buffer RAM provide concrete capacity for address learning and frame buffering. Its 3.3 V operation simplifies integration with contemporary embedded processors. Firmware and board validation should confirm initialization, address-table limits, queue behavior, and the exact host timing requirements.
推荐
VLAN-Enabled Networked Equipment
The LAN9311-NU is useful in equipment that must segment traffic logically across a small managed network. IEEE 802.1Q support for 16 VLAN groups enables isolation of management, data, and service traffic over shared 10/100 links, reducing the need for additional physical ports. Programmable QoS with four dynamic queues per port can help selected traffic receive predictable service during congestion. Because the supplied sources do not specify ingress filtering, tagging, or priority-mode details, implementers should consult the manufacturer datasheet and verify VLAN behavior against their network requirements.
推荐
Networked Measurement Instrument
The LAN9311-NU can provide dual-port connectivity for a measurement instrument that exchanges data with a service computer and a local peripheral or fixture. The 10/100 rates cover typical instrument-control traffic, while VLAN support helps maintain separation between management and measurement data. The 32 Kbyte buffer and 1 K-entry forwarding table allow the switch to absorb short traffic bursts without relying on a host software path for basic frame forwarding. For laboratory deployment, verify EMC, isolation, grounding, and environmental limits because those operating and safety parameters are not included in the supplied verified data.
推荐
Communication Equipment
The LAN9311-NU suits communication equipment requiring two economical 10/100 ports and managed traffic handling. It can support an internal management connection and an uplink while offering VLAN grouping and per-port QoS queues in a 3.3 V, 128-pin VTQFP device. The manufacturer's reference schematic and placement checklist provide implementation resources for power filtering, decoupling, and termination. Those documents also emphasize component placement, making them especially relevant to signal integrity on dense Ethernet boards. Confirm magnetics selection and isolation against the exact PHY and regulatory design requirements before schematic release.
推荐
Automated Factory Controller
The LAN9311-NU can serve as the managed Ethernet switch in an automated factory controller that links a local controller bus to an external network. Two 10/100 ports support upstream and downstream network paths, while 16 VLAN groups enable segmentation of operational traffic. Four programmable dynamic queues per port offer a practical method for prioritizing control or diagnostic traffic. The 16-bit non-PCI interface suits embedded processor integration, and the 3.3 V supply simplifies power planning. Production designers must still validate operating temperature, EMC resilience, isolation, and any functional-safety requirements not documented in the supplied sources.
推荐
推荐产品汇总
工程参考数据： LAN9311-NU ——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 | LAN9311-NZW | LAN9313-NU-TR | LAN9313-NZW-TR |
|---|---|---|---|---|
| Package | 128-pin VTQFP (14 x 14 mm) | 128-pin VTQFP (14 x 14 mm) | 128-pin VTQFP (14 x 14 mm) | 128-pin VTQFP (14 x 14 mm) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Device Type | 2-port 10/100 managed Ethernet switch controller | Microchip functional equivalent | Microchip functional equivalent | Microchip functional equivalent |
关键差异点
- Verified managed-switch feature set （对比 LAN9313-NU-TR)
- Two integrated 10/100 network ports （对比 LAN9311-NZW)
- Processor-friendly 16-bit non-PCI host interface （对比 LAN9313-NZW-TR)
设计说明
Follow the supplied LAN9311 reference schematic and the manufacturer placement checklist. The reference design places bulk capacitors close to specified LAN9311 power pins, including pins 93, 74, 117, 125, 121, 107, and 120, and identifies low-ESR requirements for several positions. Preserve short return paths and place the specified capacitors at their assigned pins rather than consolidating all decoupling at the board edge.
For the second PHY interface, the verified LAN9311 placement checklist specifies a 49.9 ohm TX termination pull-up at TXP2, pin 126, when Auto-MDIX is enabled, and requires that pull-up to be placed close to the LAN9311. If Auto-MDIX is disabled, the same document directs placement close to the magnetics. Confirm the applicable mode and preserve a short, controlled return path.
Use the manufacturer's reference schematic as the baseline for 3.3 V filtering and decoupling rather than substituting generic bulk-capacitor arrangements. Keep low-ESR capacitors close to their identified pins and verify ripple, transient response, and the startup sequence in the final power topology. Estimated power loss and junction temperature are not calculated because the verified data does not provide the complete operating-current, voltage-drop, and thermal-resistance values needed for a reliable estimate.
合规信息
The verified Abacus listing states EU RoHS compliant, REACH compliant, and DRC conflict free. No AEC-Q100 qualification, lead-free statement, or halogen-free statement was supplied for LAN9311-NU.
