KSZ9477STXI - 7-Port Gigabit Ethernet Switch | Microchip
MPN： KSZ9477STXI ✓ 啟用中KSZ9477STXI 概覽
An Ethernet switch is a network-semiconductor device that receives Ethernet frames on one port, processes Layer 2 information, and forwards traffic to one or more destination ports. The KSZ9477 belongs to the managed-switch hierarchy: Ethernet switch, Layer 2 managed Gigabit Ethernet switch, Ethernet interface controller, and semiconductor. Integrating five copper PHYs, two configurable interfaces, management logic, and advanced traffic features reduces the number of discrete network components required in industrial and communications equipment.
Verified distributor information identifies ring redundancy, IEEE 1588 v2 support, AVB, Energy Efficient Ethernet, Wake-on-LAN, QoS, LinkMD+, and SGMII support. These features support deterministic traffic handling, synchronized networks, reduced power during low activity, fault recovery, and flexible PHY uplinks. The two non-PHY ports can be configured for SGMII, RGMII, MII, or RMII according to the manufacturer product description, allowing the switch to connect a mix of copper and processor-facing network interfaces.
The KSZ9477STXI combines five integrated Gigabit PHYs with two configurable ports in one network device. Its management interfaces support I2C and SPI, while its Layer 2 feature set covers timing-sensitive traffic, redundancy, power efficiency, and link diagnostics. Compared with a discrete multi-PHY design, consolidation can reduce board-level component count, simplify firmware control, and centralize port configuration and status monitoring.
Typical installations use the KSZ9477 in industrial Ethernet controllers, networked automation equipment, communications infrastructure, embedded systems, and managed edge devices. Copper ports can connect sensors, programmable logic controllers, industrial computers, and field equipment, while SGMII or RGMII ports can connect a host processor or additional network interface. System designers must confirm the manufacturer datasheet for electrical limits, clocking requirements, supported media configurations, strap settings, exposed-pad layout, and firmware sequencing.
For PCB implementation, provide the datasheet-specified power and decoupling networks, route each differential copper pair as a controlled-impedance differential pair, and preserve the exposed-pad copper and via arrangement. Provide independent clocking, reset, and management-interface pull-ups or pull-downs exactly as specified. Validate media, firmware, thermal performance, fault-recovery behavior, and timing margins before production release.
This page combines the verified Microchip product description with distributor feature, interface, package, and sourcing data. It adds application guidance, PCB cautions, and selection context without inventing electrical limits, prices, pin assignments, or unsupported replacement claims.
直接替換替代品，適用於 KSZ9477STXI — 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： KSZ9477STXI （相同外形與佔位） — 差異在於 Package, Product Type, Number of Ports, Operating Temperature, Supply Voltage.
此產品無可直接替換的替代品。
申請替代品KSZ9477STXI 最大額定值與電氣特性
| Device Type | Managed Layer 2 Gigabit Ethernet switch |
| Total Port Count | 7 ports |
| Integrated Copper PHY Ports | 5 ports |
| Integrated PHY Data Rates | 10/100/1000 Mbps |
| Configurable Interface Ports | 2 ports |
| Configurable Interface Options | SGMII, RGMII, MII, and RMII |
| Management Interfaces | I2C and SPI |
| Ring Redundancy | Supported |
| Time Synchronization | IEEE 1588 v2 supported |
| Audio/Video Feature | AVB supported |
| Power Efficiency | Energy Efficient Ethernet supported |
| Wake Feature | Wake-on-LAN supported |
| Traffic Management | QoS supported |
| Link Diagnostics | LinkMD+ supported |
| Temperature Grade | Industrial temperature |
| 封裝 | 128-pin TQFP exposed-pad, 14 x 14 mm |
| 安裝類型 | Surface mount |
KSZ9477STXI 128-pin tqfp exposed-pad, 14 x 14 mm 腳位配置指南
KSZ9477STXI（128-pin tqfp exposed-pad, 14 x 14 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： KSZ9477STXI.
請參閱 資料表 以查看完整腳位配置。
典型應用
KSZ9477STXI 適用於 6 應用s: Industrial Ethernet Control, Managed Edge Gateway, Industrial Automation Gateway, Synchronized Network Equipment, Audio/Video Network Endpoint, Fault-Tolerant Network Switch.
Industrial Ethernet Control
The KSZ9477STXI fits industrial Ethernet control equipment requiring five integrated 10/100/1000 Mbps copper PHY connections and two additional configurable interfaces. Each copper port can connect a PLC, sensor gateway, operator terminal, or controller while QoS and LinkMD+ support traffic prioritization and link diagnostics. I2C or SPI management allows an embedded processor to configure the managed Layer 2 switch without treating every attached device as a separate external PHY. The design must still follow the datasheet for reference clocking, supply sequencing, magnetics isolation, reset, and exposed-pad thermal implementation.
Managed Edge Gateway
A managed edge gateway benefits from the KSZ9477STXI's seven-port integration: five ports terminate copper networks and two ports can connect a host through one of the supported SGMII, RGMII, MII, or RMII configurations. Energy Efficient Ethernet can reduce link energy when supported by the complete PHY, cable, and system design. Ring redundancy and Wake-on-LAN add operational value for remote equipment, while QoS helps separate management, data, and timing-sensitive traffic. Firmware configuration and host-interface timing must be validated together before selecting the exact operating mode.
Industrial Automation Gateway
The KSZ9477STXI can centralize multiple industrial Ethernet links in an automation gateway without requiring five separate copper PHY packages and two independent interface controllers. The five integrated 10/100/1000 Mbps PHYs simplify connection of controllers, drives, vision equipment, and remote I/O. LinkMD+ provides a disclosed diagnostic feature for link monitoring, while QoS can protect selected flows. Because industrial installations may include long cables and aggressive transients, engineers must follow the manufacturer recommendations for external protection, isolation, grounding, impedance, and certification testing.
Synchronized Network Equipment
KSZ9477STXI is a candidate for communications equipment needing managed Gigabit Ethernet switching together with IEEE 1588 v2 synchronization. Five integrated copper PHYs support endpoint and infrastructure connections, while the two configurable ports provide processor or uplink flexibility. The exact PTP configuration, clock source, synchronization topology, and accuracy claims must be established from the datasheet and system design. This application should be selected only when the seven-port architecture, package, firmware support, and verified timing implementation align with the equipment specification.
Audio/Video Network Endpoint
The verified AVB and QoS capabilities make the KSZ9477STXI relevant to managed audio/video network equipment that prioritizes selected real-time traffic. Five integrated Gigabit PHYs can connect endpoints or bridges, while configurable interfaces can connect a media processor. AVB support does not by itself guarantee deterministic end-to-end performance; system designers must also validate buffering, traffic shaping, host scheduling, cable loss, clock domains, and firmware configuration. Use this part when its integrated switch and management architecture match the design more closely than a simpler unmanaged PHY arrangement.
Fault-Tolerant Network Switch
KSZ9477STXI is suitable for a compact managed switching node when ring redundancy and link diagnostics are required alongside five integrated Gigabit copper PHYs. The two additional ports can provide flexibility for uplinks or processor connections, subject to their configured SGMII, RGMII, MII, or RMII mode. A fault-tolerant design still requires correct topology design, firmware support, cable and optical-component planning, and test of recovery behavior after link or power faults. Verify industrial-temperature, EMC, and reliability requirements against the complete product specification.
工程參考資料，適用於 KSZ9477STXI — 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 |
|---|---|
| Brand | Microchip Technology |
| Package | 128-pin TQFP exposed-pad, 14 x 14 mm |
| Device Type | Managed Layer 2 Gigabit Ethernet switch |
| Total Ports | 7 ports |
| Integrated Copper PHY Ports | 5 ports |
| Copper PHY Data Rates | 10/100/1000 Mbps |
| Configurable Interfaces | 2 ports supporting SGMII, RGMII, MII, and RMII |
| Management Interfaces | I2C and SPI |
| Advanced Features | Ring redundancy, IEEE 1588 v2, AVB, EEE, Wake-on-LAN, QoS, and LinkMD+ |
主要差異化特點
- Single-device integration of five copper PHYs and two configurable interfaces (對比KSZ9897)
- Broad traffic-management and timing feature set (對比BCM53134S)
- Dual host-interface flexibility within the managed switch (對比RTL8370)
設計說明
Use the manufacturer land pattern and exposed-pad via arrangement for the 128-pin 14 x 14 mm TQFP package. Keep the Ethernet differential pairs continuous, length-matched within the applicable device and magnetics guidance, and isolated from switching nodes and high-current paths. Treat the exposed pad as both a thermal and electrical-land-pattern feature; verify its net assignment against the official schematic and pin definitions before release.
Plan clock, reset, management, and serial interfaces before assigning connector and PHY positions. SGMII, RGMII, MII, and RMII modes have different signal and clocking requirements, and the verified source does not provide the mode-specific routing tables. Use the selected configuration's official datasheet guidance for trace length, topology, reference clocks, and interface voltage domains rather than applying one layout to every supported mode.
Do not substitute a functionally similar seven-port Ethernet switch based only on port count. Confirm the 128-pin footprint, exact pinout, exposed-pad connection, PHY locations, supported serial interfaces, reference clocks, management protocol, and firmware initialization. The verified alternatives search found no manufacturer-confirmed drop-in replacement, so an unverified cross-reference should be treated as a redesign requiring schematic, layout, and firmware review.
合規資訊
The supplied sources identify an industrial-temperature Ethernet switch but do not provide RoHS, REACH, halogen-free, lead-free, or conflict-minerals declarations. AEC-Q100 is treated as not applicable because this is a communications interface IC, not an identified automotive-qualified device.
