KSZ8895FQXI - 5-Port 10/100 Managed Ethernet Switch | Microchip Technology
料号： KSZ8895FQXI ✓ 量产中KSZ8895FQXI 概述
An Ethernet switch is a Layer 2 networking semiconductor that receives Ethernet frames on one port and forwards them to the appropriate destination port using MAC-address information. The KSZ8895 belongs to the broader hierarchy of Ethernet interface controllers, network switches, Layer 2 devices, and integrated network semiconductors. Its managed architecture allows a host processor or network controller to configure port behavior, while its MII and RMII interfaces support integration with embedded processors, field-programmable gate arrays, application processors, and industrial controllers.
The KSZ8895FQXI provides five integrated 10/100 Ethernet ports, MII and RMII connectivity, and a single 3.3 V operating voltage. Its 128-PQFP 14 x 20 mm package exposes the switch, copper-physical-layer, control, management, clock, and power interfaces through 128 contacts. The automotive qualification indicated by Microchip makes the device relevant to vehicle-network designs as well as industrial, communications, and embedded applications requiring a compact managed Ethernet switch. A single-chip switching design can also reduce board area, external PHY count, and system-level assembly complexity.
Microchip's integrated 10/100 Ethernet-switch implementation combines the 100BASE-TX drivers and 10BASE-T drivers so both can use the same magnetics. The 10BASE-T driver is incorporated into the 100BASE-T driver, with internally wave-shaped and pre-emphasized outputs having a typical 2.3 V amplitude. This integration supports shared copper-magnetics designs while preserving separate logical support for 10 Mb/s and 100 Mb/s operation. Management features are included at the Layer 2 level rather than requiring a separate switch controller for basic port management.
Typical applications include automotive infotainment and in-vehicle networking, industrial Ethernet gateways, factory automation controllers, building-automation equipment, communications equipment, and embedded systems that need several 10/100 ports behind one processor interface. MII is useful when the connected host requires parallel data and control signals, while RMII reduces the number of interface signals in designs where pin density is constrained. The integrated copper PHYs also support designs intended to connect directly to Ethernet magnetics and RJ45 front ends.
Hardware implementation requires careful attention to the manufacturer's KSZ8895FQX Hardware Design Checklist. The checklist specifies the RJ45 transmit-channel connections, including TX+ on RJ45 pin 3, TX- on RJ45 pin 6, and a 75-ohm series termination path through a 1000 pF, 2 kV capacitor to chassis ground. These network-interface details should be implemented exactly as described in the manufacturer document rather than inferred from generic Ethernet layouts.
This product page combines the confirmed five-port 10/100 switch functionality, package information, manufacturer guidance, qualified replacement relationships, and practical hardware-design guidance. It is intended to help engineers identify the correct Microchip orderable variant, plan the MII or RMII host connection, and evaluate whether the same-package KSZ8895 family can satisfy a lifecycle or sourcing requirement without changing the PCB footprint.
直接替换替代料： KSZ8895FQXI ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： KSZ8895FQXI （相同外形与封装尺寸） ——差异在于 Package, Product Type, Host Interface.
KSZ8895MQXCA
✅ 直接替换📋 参考替代料（不在目录中）
KSZ8895RQXI
✅ 直接替换联系询价
查看数据手册 →KSZ8895RQXIA
✅ 直接替换📋 参考替代料（不在目录中）
KSZ8895MQXI
✅ 直接替换联系询价
查看数据手册 →KSZ8993I
✅ 直接替换📋 参考替代料（不在目录中）
KSZ8895FQXI 最大额定值与电气特性
| Product Type | Managed Layer 2 Ethernet switch |
| Number of Ethernet Ports | 5 ports |
| Supported Ethernet Speeds | 10 Mb/s and 100 Mb/s |
| Integrated PHY Configuration | 5 integrated 10BASE-T/100BASE-TX PHYs |
| Host Interface | MII and RMII |
| Operating Voltage | 3.3 V |
| 封装 | 128-pin PQFP, 14 mm x 20 mm |
| 安装类型 | Surface mount |
| Network Layer | Layer 2 |
| Automotive Qualification | Automotive qualified |
| 10BASE-T Driver Integration | 10BASE-T driver incorporated into the 100BASE-T driver |
| 10BASE-T Output Amplitude | 2.3 V typical |
| Output Wave Shaping | Internally wave-shaped |
| Output Pre-emphasis | Internally pre-emphasized |
| RJ45 Transmit Channel Termination | 75 ohm in series with a 1000 pF, 2 kV capacitor to chassis ground |
KSZ8895FQXI 128-pin pqfp, 14 mm x 20 mm 引脚配置指南
KSZ8895FQXI（128-pin pqfp, 14 mm x 20 mm 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： KSZ8895FQXI.
请参阅 数据手册 以查看完整引脚配置。
典型应用
KSZ8895FQXI 适用于 6 应用s: Automotive In-Vehicle Ethernet, Industrial Ethernet Gateway, Factory Automation Controller, Building Automation Equipment, Embedded Communications Equipment, Network Appliance Front Panel.
Automotive In-Vehicle Ethernet
The KSZ8895FQXI fits automotive in-vehicle Ethernet designs that need five managed 10/100 ports, Layer 2 switching, and a compact processor interface. Its integrated copper PHYs reduce the number of external networking devices, while MII and RMII provide flexibility for different embedded host architectures. The device is automotive qualified according to Microchip's product description. An in-vehicle design should still verify the exact ordering code's temperature range, EMC behavior, and qualification conditions against the manufacturer datasheet. The 128-PQFP package also requires careful high-speed trace planning and a stable 3.3 V supply network so that five-port traffic does not degrade signal integrity or network availability.
推荐
Industrial Ethernet Gateway
The KSZ8895FQXI is appropriate for an industrial gateway that aggregates several 10/100 wired-network segments before passing traffic to an embedded processor. Five integrated 10BASE-T/100BASE-TX ports can consolidate a compact gateway architecture without a separate PHY for every copper connection, while managed Layer 2 operation supports controlled forwarding and port administration. RMII is especially useful where interface-pin count is constrained, and MII provides a parallel alternative for legacy processor platforms. The gateway must add the required Ethernet magnetics, RJ45 protection, isolation strategy, and chassis-ground termination. Use the manufacturer's hardware checklist for the recommended 75-ohm, 1000 pF, 2 kV capacitor transmit-channel termination path.
推荐
Factory Automation Controller
A factory automation controller can use the KSZ8895FQXI to combine five 10/100 network ports in a deterministic Layer 2 switching block. The integrated PHYs support 10 Mb/s and 100 Mb/s devices on the same network infrastructure, which is useful when connecting programmable controllers, sensors, operator panels, and service equipment. Host communication can use RMII to reduce parallel interface routing or MII when the controller platform benefits from direct control of individual bus signals. Because industrial installations experience conducted noise and surge events, the implementation must follow the manufacturer's external-circuit recommendations and include appropriate magnetics and protection. The 3.3 V operating rail should be filtered close to the device, and all 128 package contacts must be assigned according to the official pin-description table.
推荐
Building Automation Equipment
The KSZ8895FQXI suits building-automation equipment that connects multiple wired controller or sensor nodes through managed 10/100 Ethernet ports. Its Layer 2 management supports structured port operation, while the five integrated ports can simplify a multi-segment controller architecture. The choice between MII and RMII depends on the host processor and available pin budget: MII exposes a broad parallel interface, whereas RMII provides a more compact connection for space-constrained control boards. Copper ports still require suitable Ethernet magnetics, RJ45 interfaces, and surge protection appropriate to the building installation. Follow the manufacturer's 128-PQFP layout and pin-assignment guidance, and use the specified 75-ohm transmit-channel termination with a 1000 pF, 2 kV capacitor toward chassis ground for predictable EMC behavior.
推荐
Embedded Communications Equipment
The KSZ8895FQXI can serve as the five-port Ethernet switching core in embedded communications equipment requiring managed Layer 2 connectivity. Its 10/100 support accommodates conventional office, control, and service links while its MII and RMII options allow connection to a communications processor without introducing separate PHYs on every port. The internally wave-shaped and pre-emphasized 10BASE-T/100BASE-T driver arrangement permits shared magnetics, according to the manufacturer datasheet, helping control external-component count. Designers should still validate link performance across the required temperature range, cable lengths, and network traffic. Keep the 3.3 V distribution quiet, place bypass and required network components close to their assigned pins, and preserve the manufacturer's recommended RJ45 termination network.
推荐
Network Appliance Front Panel
The KSZ8895FQXI is useful in a network appliance front panel where multiple 10/100 service, diagnostic, or management ports must be consolidated behind one processor interface. Five managed ports can provide controlled Layer 2 forwarding for configuration traffic, maintenance links, and embedded equipment that cannot justify five external PHY devices. RMII can simplify the processor connection in a compact appliance, while MII may be preferred when the host platform requires separate control of clock, carrier, and data signals. Ethernet magnetics and RJ45 interfaces remain external, so each channel must follow the reference circuit and termination requirements. The large 128-pin PQFP footprint demands disciplined escape routing, adequate ground-plane continuity, and careful review of high-speed MII or RMII trace topology.
推荐
推荐产品汇总
工程参考数据： KSZ8895FQXI ——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 | KSZ8895MQXCA | KSZ8895RQXI | KSZ8895RQXIA | KSZ8993I |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 128-PQFP (14 x 20 mm) | 128-PQFP (14 x 20 mm) | 128-PQFP (14 x 20 mm) | 128-PQFP (14 x 20 mm) | 128-PQFP (14 x 20 mm) |
| Ethernet Ports | 5 | 5 | 5 | 5 | 5 |
| Supported Speed | 10/100 Mb/s | 10/100 Mb/s | 10/100 Mb/s | 10/100 Mb/s | 100 Mb/s |
| Switching Layer | Layer 2 managed | Layer 2 managed | Layer 2 managed | Layer 2 managed | Automotive Ethernet switch |
关键差异点
- Five integrated 10/100 ports in one switch device （对比 KSZ8993I)
- MII and RMII host-interface options （对比 KSZ8993I)
- Shared 10/100 magnetics architecture （对比 KSZ8993I)
设计说明
Implement the manufacturer-recommended RJ45 transmit-channel circuit exactly as described in the KSZ8895FQX Hardware Design Checklist. RJ45 pin 3 connects to TX+, RJ45 pin 6 connects to TX-, and the transmit channel uses 75-ohm termination through a 1000 pF, 2 kV capacitor to chassis ground. Preserve the specified return path and keep this network isolated from sensitive signal grounds where the reference design requires separation.
Plan the MII or RMII interface as a high-speed digital signal path even though the associated Ethernet links operate at 10/100 Mb/s. Use the manufacturer's interface timing and layout guidance, provide a continuous return path beneath the signals, minimize stubs, and place required termination and decoupling components close to the KSZ8895FQXI pins. The 128-pin PQFP footprint also requires adequate escape routing between the fine-pitch package and the magnetics or host processor.
Design the 3.3 V rail to support the combined demand of the managed switch and all five integrated copper PHYs. Place the manufacturer-specified bypass capacitors close to their assigned power pins, keep the high-current return path compact, and avoid routing switching-supply or digital high-current paths beneath sensitive MII/RMII and Ethernet magnetics nodes. Validate startup and full-port activity against the worst-case load condition rather than an idle link state.
Do not treat a shared package as proof that every KSZ8895 ordering suffix is an automatic substitute. Before using an MQX, RQX, or FQX-family replacement, compare the exact ordering information, temperature grade, qualification, package, and pin-level differences in Microchip's documentation. Also avoid treating the 10BASE-T and 100BASE-TX capabilities as interchangeable without validating the associated magnetics and link requirements.
合规信息
Microchip identifies the KSZ8895 as automotive qualified. Specific RoHS, REACH, lead-free, halogen-free, and conflict-minerals statements are not established by the cited product information and remain unknown.
