KSZ8873FLL - 3-Port 10/100 Ethernet Switch | Microchip
부품 번호: KSZ8873FLL ✓ 활성KSZ8873FLL 개요
An Ethernet switch is a network-semiconductor device that connects multiple Ethernet ports and forwards frames between them. The KSZ8873FLL combines three Fast Ethernet ports, integrated PHYs, switch-management functions, CPU access, and 100BASE-FX capability on one IC. This integration can reduce component count and simplify PCB layouts compared with discrete PHY and switching arrangements.
Verified product information identifies two 100BASE-FX ports and an I2C/SPI management interface. The device also provides port-based and tag-based VLAN support, QoS priority handling, one MII interface, and CPU control and data interfaces. Its 3-port architecture suits embedded systems requiring a small number of wired network connections rather than a high-port-count enterprise switch.
The KSZ8873FLL is a managed switch rather than a basic unmanaged switch. Management features allow a host processor to configure the switching fabric, addressing, VLAN behavior, and traffic priority through the available control interfaces. The separate MII interface offers a connection to an external network processor or controller when the system architecture requires centralized traffic handling.
Typical uses include industrial Ethernet equipment, embedded control systems, factory automation, telecom access hardware, and compact network-interface modules. The 100BASE-FX capability is particularly relevant where copper Ethernet reach is insufficient and optical-fiber links are preferred. Implementations should still validate magnetic-component isolation, fiber transceiver selection, thermal margin, and the complete switch-management configuration in the target system.
The primary engineering consideration is that KSZ8873FLL is a pin-compatible device within the KSZ8873 family but not a universal Ethernet-switch replacement. Board designers must verify the exact package, supported PHY/fiber configuration, management firmware expectations, operating-temperature grade, and supported supply rails before substitution. This page combines verified manufacturer and distributor information, same-family drop-in options, and practical selection guidance.
드롭인 대체품: KSZ8873FLL — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: KSZ8873FLL (동일 폼 팩터 및 풋프린트) — 차이점: Package, Product Type, Ethernet Data Rate, Host Interface, Integrated PHY.
KSZ8873MLL
✅ 드롭인가격 문의
데이터시트 보기 →KSZ8873RLL
✅ 드롭인가격 문의
데이터시트 보기 →KSZ8873RLLI
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
KSZ8873FLL 최대 정격 & 전기적 특성
| Product Type | Integrated managed Ethernet switch |
| Number of Ports | 3 ports |
| Ethernet Data Rate | 10/100 Mbps |
| 100BASE-FX Ports | 2 ports |
| Integrated PHYs | 3 integrated Fast Ethernet PHYs |
| Control Interface | I2C and SPI |
| Processor Interface | One MII interface |
| CPU Interfaces | CPU control and data interfaces |
| VLAN Support | Port-based and tag-based VLAN |
| Traffic Prioritization | QoS priority support |
| Supply Voltage Options | 1.8 V, 2.5 V, and 3.3 V |
| 패키지 | 64-LQFP, 10 x 10 mm |
| 실장 유형 | Surface mount |
| Switching Architecture | Integrated 3-port 10/100 Mbps switch |
| Design Objective | Cost-sensitive, low-port-count, power-efficient Ethernet systems |
KSZ8873FLL 64-lqfp, 10 x 10 mm 핀 구성 가이드
KSZ8873FLL(64-lqfp, 10 x 10 mm 패키지)의 핀 구성입니다. 핀 번호, 기능, 연결 다이어그램은 제조사 데이터시트에 정의되어 있습니다. 정확한 풋프린트와 솔더링 지침은 해당 문서를 참조하십시오.
다음에 대한 상세 핀아웃 데이터 없음: KSZ8873FLL.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
KSZ8873FLL 적합 용도: 6 애플리케이션s: Industrial Ethernet Control Equipment, Factory Automation Gateways, Compact Network Interface Modules, Telecom and Fiber Access Equipment, Medical and Monitoring Systems, Embedded Network Hubs.
Industrial Ethernet Control Equipment
The KSZ8873FLL fits compact industrial Ethernet equipment that needs three 10/100 Mbps connections and managed traffic behavior without a large switching ASIC. Its verified port-based and tag-based VLAN support can segment operational traffic, while QoS priority handling helps protect latency-sensitive control or diagnostic traffic. The device is placed on the equipment network backbone, with external magnetics and line-side conditioning where copper ports are required. Compared with a collection of discrete PHYs, the integrated switch reduces board-level switching complexity. Designers must still budget thermal margin, validate industrial temperature requirements, and confirm the exact supported PHY configuration for the selected ordering code.
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Factory Automation Gateways
A factory gateway can use the KSZ8873FLL to consolidate controller traffic, sensor gateways, and an uplink into a three-port managed switch. The verified 10/100 Mbps capability is suitable for conventional Fast Ethernet installations, while I2C and SPI control provide a processor-oriented path for configuration and monitoring. Port-based and tag-based VLAN functions allow equipment groups or services to be separated on the same physical network. The switch IC can sit beside the host processor, with its MII interface available when a separate Ethernet controller architecture is preferred. Validation should include loop timing, cable-length requirements, reset behavior, and any industrial temperature-grade constraints.
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Compact Network Interface Modules
The KSZ8873FLL is appropriate for compact embedded network-interface modules that need managed Fast Ethernet switching rather than only one isolated Ethernet port. Three integrated 10/100 Mbps ports can serve equipment-facing links, an uplink, and a service connection, while the 100BASE-FX capability allows fiber to be introduced where electrical reach or isolation is important. The 64-LQFP 10 x 10 mm package supports space-conscious designs without using a large modular switch assembly. System designers should verify whether the required ports use copper PHY, fiber PHY, or both; add magnetics or fiber components as required; and validate signal integrity under the worst-case cable and power-supply conditions.
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Telecom and Fiber Access Equipment
The KSZ8873FLL can support telecom-access and edge equipment where a small number of Fast Ethernet services must be switched toward an optical backbone. Its two verified 100BASE-FX ports are useful for fiber links, while the remaining switch capacity can service copper-facing equipment or management traffic. Tag-based VLAN support is valuable for separating subscriber, management, and service traffic, and QoS priority supports differentiated traffic handling. The switch is used behind the appropriate line-side components, with the system controller configuring addressing and VLAN behavior through the supported management interface. Before deployment, verify optical-media support, electrical isolation, thermal conditions, and the exact port population of the selected variant.
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Medical and Monitoring Systems
KSZ8873FLL can serve as the local managed Ethernet switch in medical monitoring or diagnostic equipment that connects acquisition hardware, a service interface, and a central station. The three-port 10/100 Mbps structure is practical for embedded systems with a small number of nodes, and VLAN capabilities can separate measurement traffic from administrative services. QoS priority can support deterministic treatment of selected data classes when the host system configures the queues correctly. The switch should be deployed only after system-level risk, isolation, and electromagnetic requirements are addressed. Designers must also verify supply sequencing, watchdog interaction, fault containment, and the operating-temperature grade needed for the finished medical equipment.
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Embedded Network Hubs
The KSZ8873FLL is suitable for embedded network hubs used to connect sensors, service equipment, and an upstream controller. Its managed-switch architecture provides more flexibility than a simple repeater because the host processor can configure VLAN membership and QoS priority through the verified I2C or SPI control paths. The three 10/100 Mbps ports minimize the number of network devices required in a small installation. A hub implementation can combine copper and 100BASE-FX links, subject to the exact port configuration of the selected variant. Engineering checks should include media compatibility, reset and configuration persistence, cable diagnostics where supported, thermal performance, and recovery behavior after power restoration.
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추천 제품 요약
엔지니어링 참조 데이터: KSZ8873FLL — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | KSZ8873MLL | KSZ8873RLL | KSZ8873RLLI |
|---|---|---|---|---|
| Package | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Port Count | 3 ports | 3 ports | 3 ports | 3 ports |
| Ethernet Data Rate | 10/100 Mbps | 10/100 Mbps | 10/100 Mbps | 10/100 Mbps |
주요 차별점
- Verified two-port 100BASE-FX capability (vs KSZ8873RLL)
- Complete same-family LQFP replacement evidence (vs KSZ8873MLL)
- Managed switching in a compact 64-LQFP package (vs KSZ8873RLLI)
설계 노트
Treat the 64-LQFP footprint as a fixed PCB constraint and verify every pin against the manufacturer datasheet before routing. The supplied data confirms the 10 x 10 mm package but does not include the numbered pin assignments, so no pin-level net names are inferred here. Place the KSZ8873FLL, its decoupling capacitors, and any required clock or management pull components according to the manufacturer reference layout to minimize return-path discontinuity and switching-node coupling.
Design the supply rails around the verified 1.8 V, 2.5 V, and 3.3 V options, but confirm the exact rail assigned to each KSZ8873FLL option before populating the board. Provide local high-frequency bypass at the supply pins and account for startup sequencing between the processor, switch, external transceivers, and line-side components. Use the manufacturer power-up sequence and ensure the switch is not operated outside the limits specified by its complete datasheet.
Separate Ethernet line-side and high-speed digital routing from clock, I2C, SPI, and MII signals as much as the compact 64-LQFP layout allows. Maintain continuous return planes beneath routed traces, avoid crossing split power planes, and follow the reference-layout guidance for magnetics, fiber components, and PHY isolation. For 100BASE-FX designs, validate the selected optical and line-side components against the actual port population of the ordered device rather than assuming every KSZ8873 suffix is electrically identical.
Do not substitute the KSZ8873MLL, KSZ8873RLL, or KSZ8873RLLI solely because their packages match. Check the ordering table for 100BASE-FX population, temperature grade, supply configuration, management interface, and device-specific behavior. The supplied cross-reference evidence establishes family-level package compatibility, but it does not provide a complete suffix-by-suffix electrical matrix, so any production substitution requires schematic, firmware, and hardware regression testing.
규정 준수 정보
The supplied verified snippets do not provide explicit compliance declarations. Compliance fields are therefore marked unknown rather than inferred from general manufacturer status.
