KSZ8995MAI - 5-Port 10/100 Managed Ethernet Switch | Microchip
부품 번호: KSZ8995MAI ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $9.2 | $9.20 |
| 10 | $8.45 | $84.50 |
| 100 | $7.3 | $730.00 |
| 500 | $6.55 | $3,275.00 |
| 1,000 | $5.95 | $5,950.00 |
KSZ8995MAI 개요
What is a managed Layer-2 Ethernet switch? A managed switch is a networking IC that operates at the data link layer (Layer 2) of the OSI model, forwarding Ethernet frames between ports using MAC-address lookup while exposing configuration, monitoring, and traffic-prioritization features to an external CPU. Within the product hierarchy, the KSZ8995MAI is a 5-port managed Fast Ethernet switch, sub-class of Ethernet switch -> Ethernet controller -> networking IC -> communication semiconductor.
Key features include five integrated 10/100BASE-TX transceivers with HP/MDI-X auto-crossover, 1.4 Gbps non-blocking switch fabric, tag/port-based VLAN (up to 16 groups), QoS with four priority queues per port, MIB II / RMON statistics counters, dual MII/RMII/SNI interfaces to external PHYs or MAC, and an I2C/SPI/E2PROM management interface. Internal frame buffer is approximately 64 KB shared across ports. The part is targeted at non-blocking wire-speed operation on all five ports simultaneously.
Architecturally, the KSZ8995MAI uses a store-and-forward switching engine with a 1K-entry address table and a shared memory packet buffer. Each port has dedicated transmit/receive FIFOs and an integrated PHY with on-chip termination resistors. The 128-pin PQFP body leaves generous copper-pour capability, beneficial for thermal dissipation since total 3.3V power scales with port activity and cable length.
Typical applications include industrial Ethernet daisy-chained sensor hubs, IPTV/Settop box LAN aggregation, fiber-to-copper media converters with 100BASE-FX support via external PHY, factory-automation I/O modules, and low-port-count unmanaged/managed enterprise edge switches. The wide QoS and VLAN feature set also makes it suitable for small-office/home-office gateway designs.
Design consideration: provision adequate 3.3V decoupling near each analog supply pin, follow Microchip's reference layout for 50-ohm controlled-impedance traces on MDI pairs, and ensure the 25 MHz reference crystal or oscillator meets the +/-50 ppm tolerance for 100BASE-TX compliance.
This page synthesizes distributor pricing, same-brand drop-in alternatives (KSZ8995MA, KSZ8995MQX/RQX/FQX, KSZ8895MQ, KSZ8995XA), and practical design notes that go beyond the manufacturer datasheet.
드롭인 대체품: KSZ8995MAI — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: KSZ8995MAI (동일 폼 팩터 및 풋프린트) — 차이점: Management Interface, Number of Ports, QoS, Supply Voltage, VLAN Support.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
KSZ8995MA
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
KSZ8995MQX
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
KSZ8995RQX
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
KSZ8995FQX
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
KSZ8995XA
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
KSZ8995MAI 최대 정격 & 전기적 특성
| Product Type | Layer-2 Managed 5-Port 10/100 Ethernet Switch |
| Number of Ports | 5 (4 external + 1 MAC-port) |
| Switch Bandwidth | 1.4 Gbps non-blocking |
| Standards Compliance | IEEE 802.3, IEEE 802.3u |
| 공급 전압 | 3.15 V to 3.45 V (3.3 V typ) |
| On-chip PHYs | 5 integrated 10/100BASE-TX transceivers |
| Auto-crossover | HP/MDI-X automatic |
| MAC Address Table | 1K entries |
| Frame Buffer | ~64 KB shared SRAM |
| VLAN Support | Tag/port-based, up to 16 groups |
| QoS | 4 priority queues per port |
| MII Interfaces | Dual MII/RMII/SNI to external MAC or PHY |
| Management Interface | I2C, SPI, EEPROM |
| 패키지 | 128-pin PQFP (14x20 mm) |
| Operating Temperature (Industrial 'I' suffix) | -40 C to +85 C |
| Reference Clock | 25 MHz, +/-50 ppm crystal/oscillator |
KSZ8995MAI 128-pin pqfp (14x20 mm) 핀 구성 가이드
KSZ8995MAI(128-pin pqfp (14x20 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: KSZ8995MAI.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
KSZ8995MAI 적합 용도: 6 애플리케이션s: Industrial Ethernet Sensor Hub, IPTV / Settop Box LAN Aggregation, Fiber-to-Copper Media Converter, Small-Office / Home-Office Gateway, Factory Automation I/O Module, Low-Port-Count Enterprise Edge Switch.
Industrial Ethernet Sensor Hub
The KSZ8995MAI is well-suited to industrial 5-port sensor aggregation hubs because its -40C to +85C industrial temperature grade and integrated 10/100BASE-TX PHYs eliminate the need for external transceivers. With 1.4 Gbps non-blocking fabric, the device can sustain wire-speed traffic on all five ports simultaneously while supporting tag-based VLANs to segregate sensor VLANs from control traffic. Place decoupling capacitors on each AVDD/DVDD pin pair, follow Microchip's reference MDI trace geometry for 100-ohm differential impedance, and use an I2C EEPROM for switch configuration storage. Compared to a discrete MAC+5x PHY design, the KSZ8995MAI cuts BOM by ~30 components and PCB area by ~40%.
추천
IPTV / Settop Box LAN Aggregation
In IPTV settop box and home gateway designs, the KSZ8995MAI provides four 10/100 copper ports plus a fifth port routed to the gateway SoC. The 4-level QoS priority queue and tag-based VLAN support allow the gateway to prioritize multicast video streams over best-effort data traffic, reducing stream-jitter artifacts. Wire-speed 1.4 Gbps throughput ensures no head-of-line blocking when all four downstream devices stream simultaneously. The PQFP-128 footprint fits the typical settop-box main board form factor, and the 3.3 V single supply matches the main SoC rail, simplifying power tree design.
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Fiber-to-Copper Media Converter
Paired with an external 100BASE-FX PHY on the MII/RMII port, the KSZ8995MAI becomes the heart of a 4-port copper-to-fiber media converter. VLAN tag preservation across the fiber uplink is supported, allowing service providers to maintain customer VLANs end-to-end. The 64 KB shared frame buffer handles bursty traffic without dropping frames, while MIB counters report per-port statistics for SLA monitoring. Industrial temperature operation suits outdoor cabinet installations. Note: for native 100BASE-FX on a port, choose the KSZ8995RQX variant which has on-chip fiber transceiver logic.
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Small-Office / Home-Office Gateway
The KSZ8995MAI is a strong fit for SOHO gateways that need four LAN ports and one WAN-facing port, all managed with QoS and VLAN awareness. The integrated PHYs remove the cost of five discrete transceivers, while the 1K-entry MAC table supports typical 200-400 device SOHO networks. Port-based VLAN isolates guest Wi-Fi from the main LAN, and four-level QoS prioritizes VoIP/SIP traffic over file downloads. The device operates from a single 3.3 V supply rail, simplifying the gateway power architecture and reducing total BOM cost by approximately $1.50 versus a discrete switch solution.
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Factory Automation I/O Module
In factory-automation I/O modules, the KSZ8995MAI aggregates multiple fieldbus-to-Ethernet gateways onto a single managed 5-port switch. The -40C to +85C industrial temperature rating and integrated HP/MDI-X auto-crossover allow direct connection to either patch or crossover cabling in harsh plant environments. Tag-based VLAN isolates safety-related EtherCAT/PROFINET traffic from standard IT traffic, while QoS priority queues ensure deterministic latency for real-time control packets. The 1.4 Gbps non-blocking fabric and 64 KB frame buffer prevent congestion under multi-master arbitration.
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Low-Port-Count Enterprise Edge Switch
For compact enterprise edge switches with five copper ports, the KSZ8995MAI provides full Layer-2 management features (tag/port VLAN, QoS, MIB counters) that would otherwise require a more expensive 8- or 16-port switch ASIC. The I2C/SPI management interface allows a low-cost external MCU (such as an EFM32 or PIC24) to act as the management controller, exposing SNMP/web UI through a serial-to-ethernet bridge. Wire-speed performance on all ports, combined with industrial temperature grade, suits deployment in wiring closets, outdoor cabinets, and industrial edge nodes.
추천
추천 제품 요약
엔지니어링 참조 데이터: KSZ8995MAI — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | KSZ8995MA | KSZ8995MQX | KSZ8995RQX | KSZ8995FQX | KSZ8995XA |
|---|---|---|---|---|---|---|
| Package | 128-PQFP (14x20 mm) | 128-PQFP (14x20 mm) - same | 128-PQFP (14x20 mm) - same | 128-PQFP (14x20 mm) - same | 128-PQFP (14x20 mm) - same | 128-PQFP (14x20 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Operating Temperature | -40 C to +85 C (Industrial) | 0 C to +70 C (Commercial) | 0 C to +70 C (Commercial) | 0 C to +70 C (Commercial) | 0 C to +70 C (Commercial) | 0 C to +70 C (Commercial) |
| Fiber Support (100BASE-FX) | No (external PHY required) | No | No | Yes (on-chip FX transceiver) | No | No |
| Number of Ports | 5 | 5 | 5 | 5 | 5 | 5 |
| Switch Fabric Throughput | 1.4 Gbps non-blocking | 1.4 Gbps | 1.4 Gbps | 1.4 Gbps | 1.4 Gbps | 1.4 Gbps |
| Management Feature Set | Full (VLAN, QoS, MIB) | Full | Full | Full | Full | Reduced register set |
| Approx. Unit Price (qty 100, 2026-10-08) | $7.30 | Lower (commercial grade) | Lower (commercial grade) | Slightly higher (FX) | Lower (commercial grade) | Lowest (cost-down variant) |
주요 차별점
- Industrial temperature grade on the same 128-pin PQFP pinout (vs KSZ8995MA)
- Full feature set: VLAN, QoS, MIB counters, dual MII (vs KSZ8995XA)
- True 5-port 10/100 switch with 1.4 Gbps non-blocking fabric (vs KSZ8895MQXIA)
설계 노트
Route the four MDI differential pairs with 100-ohm differential impedance and matched length within 2 mm. Place the 49.9-ohm 1% bias resistors on the center tap of each MDI pair as close to the KSZ8995MAI pins as possible. Provide an isolated analog ground island under the PHY section that joins the digital ground at a single point near the 3.3 V regulator ground return. Follow Microchip's reference layout to pass 100BASE-TX compliance and radiated emissions tests.
Decouple each AVDD/DVDD pin pair with 0.1 uF X7R ceramic plus 10 uF bulk tantalum or polymer near the package. The KSZ8995MAI's 3.3 V supply can draw peak currents of 350-500 mA during heavy traffic bursts; ensure the 3.3 V regulator has at least 1 A capacity and a 1% tolerance to prevent supply sag-induced PHY errors. Sequence the 3.3 V rail before any external MII-connected PHY power-up to avoid latch-up.
Do not leave the 25 MHz reference clock floating - the device requires a stable 25 MHz crystal or oscillator with +/-50 ppm tolerance, 40-60% duty cycle, and 1 ns RMS jitter for 100BASE-TX link-up. Never connect the 5th MII port's TX_CLK output to anything other than an external PHY or kept as no-connect; shorting it can cause sustained collisions. The I2C/SMI address is strap-configured at reset - wrong strap values lead to an unresponsive management interface. Always read Microchip errata documents before committing to the design.
Estimated: at 3.3 V and 1.0 W typical power, the PQFP-128 package dissipates about 0.3 W per die quadrant. With PCB copper pour of 2 sq.in. on top and bottom layers, junction-to-ambient thermal resistance drops to ~25 C/W, keeping the die 25 C above ambient at full load. No heatsink is required for typical industrial use. If forced-air cooling is not present, ensure ambient does not exceed 70 C so the 85 C industrial max is maintained with 15 C margin.
규정 준수 정보
RoHS and REACH compliance per Microchip product page. AEC-Q100 not applicable for industrial-grade Ethernet switch. Lead-free (Pb-free) PQFP-128 package. Halogen-free per Microchip environmental certification.
