LAN9420-NU - PCI Fast Ethernet Controller | Microchip
料号： LAN9420-NU ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.9282 | $4.93 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LAN9420-NU 概述
What is a Fast Ethernet controller? A Fast Ethernet controller is an integrated semiconductor that connects a host system to a 10/100BASE-T Ethernet network. It combines protocol processing, media access control, physical-layer signaling, and often host-bus or DMA functions into one device. In the broader hierarchy, the LAN9420-NU is an Ethernet controller, a network interface controller, an interface IC, and ultimately a semiconductor.
Key verified features include a PCI Local Bus Specification Revision 3.0-compliant interface, integrated DMA controller, Ethernet MAC, and 10/100 Ethernet PHY. The manufacturer documentation also identifies a system configuration diagram for the LAN9420/LAN9420i family and describes memory-mapped control and status registers. These features reduce the number of external networking components required in a PCI embedded platform.
The controller is designed for embedded systems that need Fast Ethernet connectivity without a separate external Ethernet PHY. Its integrated architecture can simplify board design while preserving a conventional PCI host interface. The verified operating specification is 0°C to 70°C, making it suited to systems requiring a commercial-temperature component where that range is appropriate.
Typical applications include industrial automation equipment, embedded instrumentation, consumer electronics, and PCI-based data-acquisition or communication systems. The exact host platform, clocking, transceiver, connector, power supply, and firmware requirements still need to be verified against the complete manufacturer datasheet before design release. The LAN9420-NU should not be selected solely from the distributor summary when detailed electrical, timing, and register requirements are needed.
For layout, follow the manufacturer placement checklist and keep the specified bypass capacitors close to the relevant power pins, including the core and PLL supplies. Validate signal integrity, reset behavior, interrupt routing, DMA configuration, and thermal performance on the final board. This page distinguishes verified facts from parameters that require confirmation from the complete LAN9420/LAN9420i datasheet.
直接替换替代料： LAN9420-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：
LAN9420I-NU
✅ 直接替换📋 参考替代料（不在目录中）
USB2250-NU-06
✅ 直接替换📋 参考替代料（不在目录中）
LAN9420-NU 规格参数
| Device Type | Ethernet controller |
| Technology | PCI, CMOS |
| Ethernet Standard | 10/100 Base-T/TX Fast Ethernet |
| Host Interface | PCI Local Bus Specification Revision 3.0 compliant |
| Integrated Blocks | DMA controller, Ethernet MAC, 10/100 Ethernet PHY |
| 电源电压 | 3.3 V |
| 工作温度 | 0°C to 70°C |
| 封装 | 128-pin VTQFP |
| Package Family | VTQFP |
| Surface-Mount Package | Yes |
| Memory-Mapped Control | Control and status registers |
| Timer | 16-bit configurable General Purpose Timer |
| Free-Run Counter | Available |
| GPIO/LED Interface | 3-pin configurable GPIO/LED interface |
| GPO Pins | 2 |
LAN9420-NU yes 引脚配置指南
LAN9420-NU（yes 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： LAN9420-NU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LAN9420-NU 适用于 6 应用s: PCI Embedded Control Systems, Industrial Automation Equipment, Data Acquisition and Test Equipment, Embedded Consumer Electronics, Networked Instrumentation, PCI Communication Gateways.
PCI Embedded Control Systems
The LAN9420-NU is a practical choice for PCI-based embedded controllers that need a compact 10/100 Ethernet connection. Its integrated PCI Local Bus Specification Revision 3.0-compliant interface, DMA controller, Ethernet MAC, and 10/100 PHY can reduce the number of separate network devices in the host design. The device is specified for a 3.3 V supply and a 0°C to 70°C operating range, so the system should verify its rail sequencing, thermal environment, and host timing against the complete manufacturer datasheet before production.
推荐
Industrial Automation Equipment
For industrial automation equipment operating within the verified 0°C to 70°C range, the LAN9420-NU can provide a single-chip Fast Ethernet endpoint with PCI host connectivity. Integrating the DMA controller, MAC, and PHY helps simplify the network path from the embedded processor or PCI bus to a 10/100BASE-T network. The design still needs industrial-grade connector and magnetics planning, surge protection, grounding, EMC validation, and a confirmed operating-temperature requirement for the complete product enclosure.
推荐
Data Acquisition and Test Equipment
The LAN9420-NU can support networked data-acquisition and test equipment built around a PCI host. Its 10/100 Ethernet MAC and PHY provide a network transport path, while the integrated DMA controller can support efficient movement of data between the PCI system and the Ethernet engine. Designers should confirm DMA behavior, interrupt handling, register compatibility, timing, and clock requirements in the manufacturer documentation. The 128-pin VTQFP package also requires careful high-pin-count layout and assembly planning.
推荐
Embedded Consumer Electronics
The integrated PCI, DMA, MAC, and 10/100 PHY architecture makes the LAN9420-NU relevant to embedded consumer products that expose an Ethernet service through a PCI-compatible host. A single-chip network path can simplify board partitioning when the product already uses a PCI bus and does not require faster than 100 Mb/s Ethernet. The designer must still budget for Ethernet magnetics, RJ45 or alternative connectors, isolation, power regulation, chassis or enclosure requirements, and product-specific EMC testing.
推荐
Networked Instrumentation
For instrumentation that needs remote control or telemetry over 10/100 Ethernet, the LAN9420-NU can act as the PCI-facing network controller. Its integrated 10/100 PHY avoids requiring a separate PHY in the basic architecture, while the MAC and DMA blocks support Ethernet frame processing and host transfer. For measurement accuracy, keep noisy analog and switching circuitry away from the controller, use controlled reference and clock distribution, and validate interrupt latency and data integrity across the complete instrument signal chain.
推荐
PCI Communication Gateways
The LAN9420-NU is suitable as a building block for PCI communication gateways that bridge an embedded host to a 10/100 Ethernet segment. Its PCI interface and DMA controller can sit between host memory and the Ethernet MAC, while the integrated PHY simplifies the physical-layer implementation. Gateway designs should define buffering, timeout behavior, security, protocol handling, watchdog behavior, and recovery procedures in firmware. They should also verify the 3.3 V supply and 0°C to 70°C range against the enclosure and deployment environment.
推荐
推荐产品汇总
工程参考数据： LAN9420-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 | LAN9420I-NU | USB2250-NU-06 |
|---|---|---|---|
| Device Type | 10/100 Base-T/TX Ethernet controller | 10/100 Ethernet controller; related family member | Ethernet controller; separate family comparison result |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
关键差异点
- Integrated PCI-to-Ethernet architecture （对比 LAN9420I-NU)
- Single-chip 10/100 networking integration （对比 USB2250-NU-06)
- Commercial-temperature operating range （对比 LAN9420I-NU)
- Distributed sourcing visibility （对比 Generic PCI Ethernet controller alternatives)
设计说明
Use the Microchip LAN9420 VTQFP placement checklist as the layout baseline. The supplied checklist specifically states that the VDD18CORE bypass capacitors use 0.01 µF and should be placed as close as possible to pins 9 and 82, and that the VDD18PLL capacitor should also be close to its power pin. Preserve the recommended pin orientation, thermal-pad or exposed-connection requirements, and package land pattern from the official drawings before fabrication.
Plan the PCI and Ethernet paths as controlled-impedance interfaces rather than treating all nets as ordinary low-speed digital connections. Separate clock, data, reset, and power-return paths where the datasheet and system architecture permit, and provide termination only where required by the relevant interface specification. Because the supplied data does not provide the complete timing tables or board stack-up values, validate signal integrity with the final controller, connector, magnetics, and enclosure implementation.
The verified distributor specification identifies a 3.3 V supply for the LAN9420-NU, but it does not replace the manufacturer’s detailed power-tree requirements. Confirm all rail names, tolerances, sequencing, current limits, and decoupling values from the official datasheet. Keep high-current and switching-supply nodes away from sensitive clock and Ethernet areas, and include test points for startup, steady-state voltage, ripple, and reset behavior.
Do not assume that a 128-pin VTQFP package is thermally sufficient without checking the actual dissipation and PCB construction. Use the manufacturer package thermal information, copper area, airflow, ambient temperature, and the system’s maximum traffic duty cycle in the thermal assessment. If the controller operates near the verified 70°C upper limit, verify the full board temperature and junction margin rather than relying only on ambient specifications.
A related family name does not automatically establish drop-in compatibility. Before substituting LAN9420I-NU or another candidate, compare the exact package drawing, pin names, power rails, strap options, reset behavior, interrupt polarity, register map, DMA behavior, timing, and firmware assumptions. The supplied cross-reference results do not verify a fully qualified substitute, so any replacement decision requires manufacturer data and board-level testing.
合规信息
The supplied verified data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for LAN9420-NU. Obtain current compliance documentation for the exact orderable part before regulated use.
