KSZ8864RMN - 4-Port 10/100 Managed Ethernet Switch | Microchip
MPN： KSZ8864RMN ✓ 啟用中KSZ8864RMN 概覽
An Ethernet switch is a semiconductor that connects multiple physical network ports and forwards Ethernet frames between them. The KSZ8864RMN belongs to the interface-controller hierarchy: Ethernet switch, Layer 2 network controller, network interface IC, and integrated circuit. Its managed architecture supports cost-sensitive industrial, automotive, communications, and embedded Ethernet systems while reducing the number of external discrete components required for four-port copper networking.
The principal features include four 10/100 Mbps copper ports, two MII or RMII MAC interfaces, a high-speed non-blocking switch fabric, and on-chip frame buffering. According to the manufacturer datasheet, the switch fabric has 1.4 Gbps memory bandwidth. The device also uses enhanced mixed-signal technology in its PHYs and integrates on-chip termination, helping reduce external circuit requirements. A dedicated address lookup engine handles frame-forwarding decisions within the integrated Layer 2 switch.
The KSZ8864RMN combines PHY, MAC, switching, and memory functions in one 64-QFN package. This integration can shorten the design path for embedded equipment requiring four copper Ethernet ports, while the dual MAC interfaces allow the switch to operate alongside a host processor or another network controller. Because it is a managed Layer 2 switch, designers should configure forwarding, filtering, and related behavior through the supported management interface rather than treating it as an unmanaged bridge.
Typical applications include industrial Ethernet controllers, automotive infotainment or networking modules, factory equipment, building automation, communications equipment, and embedded gateways. The four-port configuration is particularly useful where a single host must connect to multiple 10/100 Mbps devices. For systems using newer infrastructure, the 10/100 Mbps capability remains relevant for legacy copper links but does not provide gigabit Ethernet throughput.
Designers should preserve the exact Microchip reference layout, verify thermal performance across the required ambient range, and confirm management firmware and host-interface timing before release. The 8 mm by 8 mm exposed-pad package requires adequate PCB copper and reflow control. Although the KSZ8864 family has documented functional drop-in replacements, engineers must verify device-specific ordering codes, temperature grades, and firmware behavior before substitution.
This product summary combines manufacturer documentation, distributor listings, package information, and verified family cross-reference data. It also identifies same-package drop-in candidates and highlights the practical verification points that are not apparent from a distributor headline alone.
直接替換替代品，適用於 KSZ8864RMN — 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。
KSZ8864RMNUB
✅ 直接替換📋 參考替代品（不在目錄中）
KSZ8864CNXIA
✅ 直接替換📋 參考替代品（不在目錄中）
KSZ8864RMNI
✅ 直接替換聯絡詢價
查看資料表 →KSZ8864CNX
✅ 直接替換📋 參考替代品（不在目錄中）
KSZ8864CNXIA-TR
✅ 直接替換📋 參考替代品（不在目錄中）
KSZ8864RMN 最大額定值與電氣特性
| Product Type | Integrated Layer 2 managed Ethernet switch |
| Number of Ethernet Ports | 4 ports |
| Copper Port Speed | 10 Mbps to 100 Mbps |
| MAC Interface Count | 2 MACs |
| Host Interface Options | MII or RMII |
| Switch Fabric Type | High-speed non-blocking switch fabric |
| Switch Fabric Memory Bandwidth | 1.4 Gbps |
| Frame Buffer | On-chip frame buffer memory |
| Address Lookup | Dedicated address lookup engine |
| Integrated PHY Technology | Enhanced mixed-signal Ethernet PHY technology |
| Integrated Termination | On-chip termination |
| 供應電壓 | 3.3 V |
| 工作溫度 | -40 C to +85 C |
| 封裝 | 64-QFN, 8 mm x 8 mm |
| 安裝類型 | Surface mount |
| Ethernet Media Support | 10/100 Base-T/TX copper |
| Management Architecture | Layer 2 managed switch |
| Automotive Qualification | KSZ8864 family described as AEC-Q100 automotive qualified |
KSZ8864RMN 64-qfn, 8 mm x 8 mm 腳位配置指南
KSZ8864RMN（64-qfn, 8 mm x 8 mm 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： KSZ8864RMN.
請參閱 資料表 以查看完整腳位配置。
典型應用
KSZ8864RMN 適用於 6 應用s: Industrial Ethernet Gateway, Automotive Network Interface, Building Automation Controller, Embedded Communication Equipment, Factory Equipment Network Hub, Legacy Network Adapter.
Industrial Ethernet Gateway
The KSZ8864RMN fits an industrial gateway that must combine four 10/100 Mbps copper links with a host processor. Its two MII or RMII MAC interfaces provide flexible host connectivity, while the managed Layer 2 architecture supports address-based forwarding and filtering. The integrated switch fabric, 1.4 Gbps memory bandwidth, and on-chip frame buffer reduce the need for a separate switch controller and external buffer memory. In a 24 V industrial environment, the design should add appropriate input protection and isolated communications, and it must verify the documented -40 C to +85 C operating range against the enclosure temperature.
推薦
Automotive Network Interface
The KSZ8864RMN is suitable for a compact automotive network interface that requires four legacy Fast Ethernet ports and local frame switching. The device combines four PHYs, two MACs, a non-blocking Layer 2 fabric, address lookup, and frame buffering in one 64-QFN 8 mm by 8 mm package. The KSZ8864 family is described as AEC-Q100 automotive qualified, and the RMN device supports -40 C to +85 C. Engineers must still confirm the exact ordering code's qualification, review automotive errata, implement the manufacturer's reference layout, and validate EMC, fault injection, and power-sequencing behavior.
推薦
Building Automation Controller
A building automation controller can use the KSZ8864RMN to consolidate several 10/100 Mbps field devices into one host interface. Its four integrated Fast Ethernet PHYs provide copper connectivity without four separate MAC devices, and the managed Layer 2 switch can perform local filtering and forwarding between attached devices. The 64-QFN package limits board area, while the -40 C to +85 C range covers many uncontrolled equipment locations. Because building systems can have long cables and severe transients, the implementation should add surge and isolation protection and should not assume that the integrated PHY termination replaces all external Ethernet safety circuitry.
推薦
Embedded Communication Equipment
The KSZ8864RMN is useful in embedded communication equipment that needs several copper Ethernet ports but has limited board area. Integrating four PHYs, two MACs, the switch fabric, address lookup engine, and frame buffer into one 64-QFN device reduces component count compared with a discrete switching implementation. The device's 10/100 Mbps ports are appropriate for legacy devices, while the internal 1.4 Gbps fabric supplies non-blocking internal switching resources. Designers should use the official reference layout for the exposed pad, provide continuous low-impedance ground planes, and confirm that their host firmware supports the required management and interrupt behavior.
推薦
Factory Equipment Network Hub
The KSZ8864RMN can serve as the central Ethernet hub inside a single factory machine or cell containing sensors, PLCs, vision modules, and service interfaces. Four 10/100 Mbps ports provide a managed Layer 2 connection point without requiring a separate external switch chip. Its integrated termination and mixed-signal PHY technology can simplify the analog network design, while the 3.3 V supply aligns with common embedded logic systems. Production validation should include cable-length compliance, common-mode transient immunity, ground-bounce behavior, thermal testing, and compatibility checks with the exact industrial PHYs used by connected equipment.
推薦
Legacy Network Adapter
The KSZ8864RMN can support a legacy copper-network adapter requiring one host connection and several downstream 10/100 Mbps links. One MAC interface can connect the system processor through MII or RMII, while the other provides optional additional controller connectivity. The remaining switch resources perform Layer 2 forwarding using the dedicated address lookup engine and on-chip frame buffer. This arrangement is useful when migrating an established embedded platform rather than adopting a new gigabit Ethernet architecture. Because the part is managed, the host software must initialize the necessary switch functions, and developers should check all interrupt and management interfaces against their platform driver.
推薦
推薦產品摘要
工程參考資料，適用於 KSZ8864RMN — 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 | KSZ8864RMNUB | KSZ8864CNXIA | KSZ8864RMNI | KSZ8864CNX | KSZ8864CNXIA-TR |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (8 mm x 8 mm) | 64-QFN (8 mm x 8 mm) | 64-QFN (8 mm x 8 mm) | 64-VFQFN (8 mm x 8 mm) | 64-QFN (8 mm x 8 mm) | 64-QFN (8 mm x 8 mm) |
| Ethernet Port Count | 4 ports | 4 ports | 4 ports | 4 ports | 4 ports | 4 ports |
| Copper Ethernet Speed | 10/100 Mbps | 10/100 Mbps | 10/100 Mbps | 10/100 Mbps | 10/100 Mbps | 10/100 Mbps |
| Host Interface | MII or RMII | MII or RMII | MII or RMII | MII or RMII | MII or RMII | MII or RMII |
| Operating Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
主要差異化特點
- Four integrated copper PHYs plus two host-side MAC interfaces in one package (對比KSZ8864RMNI)
- Enhanced generation adds documented power-saving implementation (對比KSZ8864RMNUB)
- LinkMD feature is documented for the enhanced replacement family (對比KSZ8864CNXIA)
- Integration reduces the need for separate Ethernet switching components (對比KSZ8864CNX)
設計說明
Follow the official Microchip recommended land pattern for the 64-QFN 8 mm by 8 mm package, including its exposed thermal pad. Place the device and its required support components in accordance with the manufacturer reference layout, provide uninterrupted ground-plane connectivity beneath the pad, and avoid placing high-current or high-speed digital return paths beneath the analog PHY area. The package has no canonical 64-pin QFN entry in the supplied SVG library, so engineers should use the official package drawing rather than a generic pin diagram.
Separate the four Ethernet differential pairs from clocks, switching regulators, and unrelated digital interfaces, and route each pair with a continuous reference plane over its complete length. The KSZ8864RMN integrates PHYs, but external magnetics, termination, protection, and layout geometry still determine field performance. Keep the routing symmetrical, minimize vias, avoid stubs, and use the manufacturer reference schematic and PCB files so that integrated-termination and PHY-decoupling requirements are reproduced exactly.
Design the 3.3 V supply for low-noise operation and verify ripple, startup, and load-transient behavior using the manufacturer's limits. Decoupling must follow the datasheet's recommended capacitance, voltage rating, and placement rather than a generic bulk-capacitor rule. For a new layout, separate the 3.3 V digital and PHY supply branches if the reference design specifies them, and use local high-frequency decoupling at the device supply pins with additional bulk capacitance placed according to the recommended component placement.
Do not confuse the 1.4 Gbps internal memory bandwidth with a 1 Gbps copper Ethernet port: the four external ports operate at 10/100 Mbps. Also do not assume that a same-package alternative is a complete functional substitute. For KSZ8864RMNUB, KSZ8864CNX, and related options, Microchip documents pin compatibility and functional replacement, but register changes, firmware assumptions, temperature grade, qualification, and ordering code must still be reviewed before releasing a modified design.
合規資訊
The official Microchip product page describes the KSZ8864 family as automotive qualified under AEC-Q100. No explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration for the exact RMN ordering code was included in the verified data.
