KSZ8864RMNU - 4-Port 10/100 Ethernet Switch | Microchip
MPN： KSZ8864RMNU ✗ 停產KSZ8864RMNU 概覽
An Ethernet switch is a networking semiconductor that connects multiple Ethernet nodes through one physical device and forwards frames according to Layer 2 MAC addresses. The KSZ8864 belongs to the managed Ethernet switch category, combining four integrated 10/100 Base-T/TX ports with interfaces for a host processor or network controller. This integration reduces board area, external PHY count, and system complexity in embedded networking designs.
Key features include four 10/100 Mbps Ethernet ports, a Layer 2 managed-switch architecture, support for MII and RMII interfaces, and AEC-Q100 automotive qualification. Its 1400 Mbps aggregate switching capacity is appropriate for Fast Ethernet equipment carrying standard 10/100 traffic. A 64-pin QFN package with an exposed pad supports compact surface-mount layouts while providing a thermal and ground connection beneath the device.
The KSZ8864RMNU is optimized for embedded systems that require several Fast Ethernet ports without the size or cost of a discrete multi-PHY implementation. Two integrated PHYs and two MAC interfaces divide connectivity between external network ports and the processor-facing side of the design. MII compatibility supports a parallel host interface, while RMII reduces host-side pin requirements when paired with a compatible Ethernet controller or processor.
Typical applications include automotive infotainment systems, industrial Ethernet controllers, embedded routers, network appliances, IP cameras, and compact communications equipment. The AEC-Q100 qualification is particularly relevant to automotive platforms requiring a managed Ethernet switch with a small footprint and integrated Fast Ethernet ports. Industrial and commercial products can also use the device where MII or RMII host connectivity is preferred.
Designers should follow the manufacturer’s KSZ8864CNX/RMNUB Hardware Design Checklist when assigning RJ45 magnetics, line-side termination, supply connections, exposed-pad layout, and clock requirements. Because the target KSZ8864RMNU is listed as obsolete, a replacement should be checked against the pin-compatibility table in the Microchip replacement notice before schematic and PCB changes are approved.
This product page combines the verified device identity, package details, lifecycle information, manufacturer documentation, and the manufacturer-supported replacement path with practical networking and layout guidance. It helps engineers identify the obsolete MPN, evaluate the documented functional replacement, and determine whether existing hardware can remain unchanged.
直接替換替代品，適用於 KSZ8864RMNU — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： KSZ8864RMNU （相同外形與佔位） — 差異在於 Automotive Qualification, Package.
KSZ8864CNXIA-TR
✅ 直接替換📋 參考替代品（不在目錄中）
KSZ8864RMNU 最大額定值與電氣特性
| Device Type | Layer 2 managed Ethernet switch |
| Number of Ethernet Ports | 4 ports |
| Ethernet Speed | 10/100 Mbps per port |
| Aggregate Switching Throughput | 1400 Mbps |
| Integrated PHY Count | 2 PHYs |
| Integrated MAC Interface Count | 2 MAC interfaces |
| Host Interface | MII and RMII |
| Ethernet Media | 10/100 Base-T/TX |
| Layer | Layer 2 |
| 封裝 | 64-pin QFN, 8 x 8 mm |
| Package Type | Surface-mount QFN with exposed pad |
| Automotive Qualification | AEC-Q100 qualified |
| RoHS 狀態 | RoHS compliant |
| Lead-Free Status | Lead free |
| Maximum Total Switching Throughput | 1400 Mbps |
KSZ8864RMNU surface-mount qfn with exposed pad 腳位配置指南
KSZ8864RMNU（surface-mount qfn with exposed pad 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： KSZ8864RMNU.
請參閱 資料表 以查看完整腳位配置。
典型應用
KSZ8864RMNU 適用於 6 應用s: Automotive Infotainment Networking, Industrial Ethernet Gateway, IP Camera and Surveillance Hub, Embedded Router and Network Appliance, Industrial Control and Embedded HMI, Automotive Camera and Sensor Backbone.
Automotive Infotainment Networking
The KSZ8864RMNU fits automotive infotainment and cabin-network designs that need four 10/100 Mbps links around a host processor. Its Layer 2 managed-switch architecture, MII or RMII connectivity, and AEC-Q100 qualification align with compact vehicle-networking requirements. The 1400 Mbps aggregate switching capability supports Fast Ethernet traffic without four separate external PHYs. In a completed design, verify clock sourcing, isolation requirements, EMI filtering, and the manufacturer’s RJ45 termination guidance before production release.
推薦
Industrial Ethernet Gateway
The KSZ8864RMNU is suitable for industrial gateways that aggregate several Fast Ethernet devices while retaining a compact processor interface. Four 10/100 Mbps ports cover equipment-facing links, and the MII or RMII choice allows the gateway controller to use either a parallel or reduced-pin host connection. The 64-pin QFN package limits board area, while the 1400 Mbps aggregate rate matches Fast Ethernet workloads. For harsh industrial environments, validate conducted emissions, immunity, isolation, and operating-temperature requirements at the system level.
推薦
IP Camera and Surveillance Hub
The KSZ8864RMNU can form the Fast Ethernet switching section of an IP camera or compact surveillance hub. Its four 10/100 Mbps ports support camera and uplink connections, while the managed Layer 2 architecture can reduce repeated host handling of frames that remain within the local network. MII or RMII connectivity permits integration with an embedded Linux-capable controller. The main design considerations are low-latency frame forwarding, link indicators, RJ45 magnetic integration, and ensuring the power budget remains within the camera enclosure’s thermal envelope.
推薦
Embedded Router and Network Appliance
The KSZ8864RMNU is appropriate for embedded routers, access points, and network appliances that need four Fast Ethernet device ports. The processor-facing MII or RMII interface connects the managed switch to a network controller, allowing the host to handle routing, discovery, and management functions. Integrating four 10/100 Mbps ports in one 64-pin QFN device reduces the component count and board space required for discrete switching. Design teams should assess boot sequencing, firmware initialization, store-and-forward behavior, and link-flap recovery against the system networking requirements.
推薦
Industrial Control and Embedded HMI
The KSZ8864RMNU can connect programmable controllers, sensors, and operator panels in an embedded human-machine interface using 10/100 Mbps Ethernet. Four integrated ports reduce the number of external network components, while MII or RMII provides flexibility for different host processors. The managed Layer 2 function is useful for local traffic segmentation and centralized monitoring. For control-system use, treat network determinism and fault recovery as system properties: test frame latency, link-loss behavior, ground offsets, surge exposure, and recovery time under representative operating conditions.
推薦
Automotive Camera and Sensor Backbone
The KSZ8864RMNU can support a Fast Ethernet backbone that connects automotive cameras, sensors, and a vehicle-domain controller. Four 10/100 Mbps ports offer an efficient way to distribute network links, while AEC-Q100 qualification is important for automotive qualification programs. The MII and RMII interfaces allow connection to compatible vehicle processors or controllers. Engineers must implement the manufacturer’s line-side termination and grounding guidance, then verify electromagnetic compatibility, network security, startup behavior, and diagnostic requirements for the complete vehicle platform.
推薦
推薦產品摘要
工程參考資料，適用於 KSZ8864RMNU — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | KSZ8864CNXIA-TR |
|---|---|---|
| Device Type | Layer 2 managed Ethernet switch | Functional managed Ethernet switch replacement |
| Brand | Microchip Technology | Microchip Technology |
| Package | 64-pin QFN, 8 x 8 mm | QFN-64, 8 x 8 mm |
| Number of Ethernet Ports | 4 ports | 4 ports |
| Ethernet Speed | 10/100 Mbps per port | 10/100 Mbps per port |
| Aggregate Switching Throughput | 1400 Mbps | 1400 Mbps |
| Host Interface | MII and RMII | MII and RMII |
| Automotive Qualification | AEC-Q100 qualified | AEC-Q100 family qualification |
主要差異化特點
- Compact four-port managed switching integration (對比KSZ8864CNXIA-TR)
- Processor interface flexibility (對比KSZ8864CNXIA-TR)
- Automotive-grade switch family (對比KSZ8864CNXIA-TR)
設計說明
Follow the Microchip KSZ8864CNX/RMNUB Hardware Design Checklist for the exposed pad, supply routing, clock connections, and line-side network interface. The checklist specifies an equivalent RJ45 termination arrangement involving pins 4 and 5, a 75 ohm resistor in series with a 1000 pF, 2 kV capacitor to chassis ground, and optional use of RJ45 pins 7 and 8 with an unused CAT-5 wire pair. Apply these instructions to the selected package and verify the exact schematic against the manufacturer document.
Place network and decoupling connections in accordance with the manufacturer layout guidance, keeping the 64-pin QFN exposed-pad connection thermally and electrically sound. A short return path beneath the device is essential because the exposed pad normally serves both ground and heat-dissipation functions. Check all package pins against the manufacturer pin table before routing MII, RMII, clock, reset, LED, and power signals, especially when replacing the obsolete target with the manufacturer-supported ordering code.
Treat the RMII clock and MII timing as constrained board-level interfaces. Route these signals with continuous reference planes, avoid unnecessary stubs, and match trace lengths where the processor and Ethernet-switch interface timing requires it. Isolate switching or high-current clock sources, and verify the host controller’s RMII timing configuration against the KSZ8864 requirements. Signal-integrity validation should include Ethernet traffic at line rate rather than relying only on functional link testing.
合規資訊
The manufacturer identifies the KSZ8864 family as AEC-Q100 qualified. RoHS-compliant and lead-free status are stated for KSZ8864RMNU; other environmental declarations were not confirmed.
