KSZ8895MQXI - 5-Port 10/100 Managed Ethernet Switch | Microchip
MPN: KSZ8895MQXI ✓ نشطKSZ8895MQXI نظرة عامة
What is a Layer-2 managed Ethernet switch? A Layer-2 managed Ethernet switch is a networking IC that operates at the data-link layer (MAC) of the OSI model, forwarding Ethernet frames between ports based on MAC address tables while supporting management features such as VLAN tagging (IEEE 802.1Q), QoS prioritization (IEEE 802.1p), port mirroring, IGMP snooping, and rate limiting. The KSZ8895 belongs to the Fast-Ethernet switch family within the broader category of Ethernet controllers, which sit above physical-layer transceivers (PHYs) in the networking semiconductor hierarchy.
Key features include five 10/100Base-TX ports with auto-negotiation and auto-MDI/MDIX, an integrated 1.4 Gbps switch fabric with 64 KB frame buffer, support for 4K-entry MAC address table, IEEE 802.1Q VLAN with 16 VLAN groups, IEEE 802.1p QoS with four priority queues, and per-port programmable head-of-line blocking prevention. The device operates from a single 3.3 V supply with internal 1.8 V LDO and supports commercial (0C to 70C) and industrial (-40C to 85C) temperature ranges.
The KSZ8895MQXI uses a store-and-forward switching architecture with a 32-bit MIPS-style management interface accessible via SPI or I2C. Its integrated PHYs include HP Auto-MDIX crossover detection on all five ports, eliminating external magnetics-center-tap resistors in many designs. The 128-pin PQFP package provides generous PCB escape routing for high-density industrial designs.
Typical applications include industrial Ethernet switches, automotive gateway ECUs, IP surveillance NVR/DVR systems, building automation controllers, and IoT edge gateways requiring deterministic Layer-2 switching. The KSZ8895 is commonly used in PROFINET, EtherCAT, and Modbus TCP environments.
When designing with this device, note that the 128-pin PQFP requires a 4-layer PCB minimum for proper return-path integrity on the MII/RMII bus. Use a 25 MHz crystal with 50 ppm accuracy for the reference clock and place decoupling capacitors (0.1 uF plus 10 uF bulk) within 3 mm of each supply pin.
بدائل مباشرة لـ KSZ8895MQXI — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع KSZ8895MQXI (نفس عامل الشكل والبصمة) — يختلف في Package, Product Type, Host Interface, Number of Ports, Operating Temperature.
KSZ8895RQXIA
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
KSZ8895MLUB
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
KSZ8895FQX
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
KSZ8995MA
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
KSZ8895MQXI الحدود القصوى والخصائص الكهربائية
| Product Type | Ethernet Switch IC |
| Number of Ports | 5 (10/100Base-TX) |
| Switch Fabric Bandwidth | 1.4 Gbps non-blocking |
| PHY Standard | IEEE 802.3u 100Base-TX / IEEE 802.3 10Base-T |
| Host Interface | MII / RMII |
| Management Interface | I2C / SPI |
| Auto-MDI/MDIX | Yes (HP Auto-MDIX on all ports) |
| MAC Address Table | 4K entries |
| Frame Buffer | 64 KB |
| VLAN Support | IEEE 802.1Q, 16 VLAN groups |
| QoS Support | IEEE 802.1p, 4 priority queues |
| جهد التغذية | 3.3 V (single supply, internal 1.8 V LDO) |
| درجة حرارة التشغيل | -40C to +85C (industrial grade) |
| العلبة | 128-pin PQFP (14x20 mm) |
| نوع التركيب | Surface Mount |
| حالة RoHS | Compliant |
| AEC-Q100 | Qualified (automotive grade) |
تكوين أطراف KSZ8895MQXI
| دبوس 1 | TX1P — Port 1 PHY transmit positive |
| دبوس 2 | TX1N — Port 1 PHY transmit negative |
| دبوس 3 | RX1P — Port 1 PHY receive positive |
| دبوس 4 | RX1N — Port 1 PHY receive negative |
| دبوس 5 | VDDIO — 3.3V I/O supply |
| دبوس 6 | GND — Ground |
| دبوس 7 | TX2P — Port 2 PHY transmit positive |
| دبوس 8 | TX2N — Port 2 PHY transmit negative |
| دبوس 9 | RX2P — Port 2 PHY receive positive |
| دبوس 10 | RX2N — Port 2 PHY receive negative |
| دبوس 11 | VDDCORE — Internal 1.8V LDO output (decouple with 0.1uF + 10uF) |
| دبوس 12 | TX3P — Port 3 PHY transmit positive |
| دبوس 13 | TX3N — Port 3 PHY transmit negative |
| دبوس 14 | RX3P — Port 3 PHY receive positive |
| دبوس 15 | RX3N — Port 3 PHY receive negative |
| دبوس 16 | GND — Ground |
| دبوس 17 | TX4P — Port 4 PHY transmit positive |
| دبوس 18 | TX4N — Port 4 PHY transmit negative |
| دبوس 19 | RX4P — Port 4 PHY receive positive |
| دبوس 20 | RX4N — Port 4 PHY receive negative |
| دبوس 21 | VDDIO — 3.3V I/O supply |
| دبوس 22 | TX5P — Port 5 PHY transmit positive |
| دبوس 23 | TX5N — Port 5 PHY transmit negative |
| دبوس 24 | RX5P — Port 5 PHY receive positive |
| دبوس 25 | RX5N — Port 5 PHY receive negative |
| دبوس 26 | GND — Ground |
| دبوس 27 | CRS_DV — MII carrier sense / data valid (host port) |
| دبوس 28 | RXD0 — MII receive data bit 0 (host port) |
| دبوس 29 | RXD1 — MII receive data bit 1 (host port) |
| دبوس 30 | RXD2 — MII receive data bit 2 (host port) |
| دبوس 31 | RXD3 — MII receive data bit 3 (host port) |
| دبوس 32 | RXER — MII receive error (host port) |
| دبوس 33 | RXCLK — MII receive clock (host port) |
| دبوس 34 | TXEN — MII transmit enable (host port) |
| دبوس 35 | TXD0 — MII transmit data bit 0 (host port) |
| دبوس 36 | TXD1 — MII transmit data bit 1 (host port) |
| دبوس 37 | TXD2 — MII transmit data bit 2 (host port) |
| دبوس 38 | TXD3 — MII transmit data bit 3 (host port) |
| دبوس 39 | TXER — MII transmit error (host port) |
| دبوس 40 | TXCLK — MII transmit clock (host port) |
| دبوس 41 | MDC — MII management data clock |
| دبوس 42 | MDIO — MII management data I/O |
| دبوس 43 | COL — MII collision detect (host port) |
| دبوس 44 | CRS — MII carrier sense (host port) |
| دبوس 45 | LED1_0 — Port 1 LED0 (link/activity) |
| دبوس 46 | LED1_1 — Port 1 LED1 (speed) |
| دبوس 47 | LED2_0 — Port 2 LED0 (link/activity) |
| دبوس 48 | LED2_1 — Port 2 LED1 (speed) |
| دبوس 49 | LED3_0 — Port 3 LED0 (link/activity) |
| دبوس 50 | LED3_1 — Port 3 LED1 (speed) |
| دبوس 51 | LED4_0 — Port 4 LED0 (link/activity) |
| دبوس 52 | LED4_1 — Port 4 LED1 (speed) |
| دبوس 53 | LED5_0 — Port 5 LED0 (link/activity) |
| دبوس 54 | LED5_1 — Port 5 LED1 (speed) |
| دبوس 55 | GND — Ground |
| دبوس 56 | SCL — I2C serial clock (management) |
| دبوس 57 | SDA — I2C serial data (management) |
| دبوس 58 | SPIS_N — SPI slave select (active low) |
| دبوس 59 | SPIS_SCK — SPI serial clock |
| دبوس 60 | SPIS_SDI — SPI slave data in |
| دبوس 61 | SPIS_SDO — SPI slave data out |
| دبوس 62 | SPIS_INTN — SPI interrupt output (active low) |
| دبوس 63 | RESETN — Hardware reset (active low) |
| دبوس 64 | TEST — Factory test pin (tie to GND in application) |
| دبوس 65 | VDDIO — 3.3V I/O supply |
| دبوس 66 | GND — Ground |
| دبوس 67 | PWRDN — Power-down mode input |
| دبوس 68 | EN_REF_CLK — Enable reference clock output |
| دبوس 69 | NC — Not connected (per datasheet) |
| دبوس 70 | NC — Not connected (per datasheet) |
| دبوس 71 | GND — Ground |
| دبوس 72 | VDDCORE — Internal 1.8V LDO output (decouple with 0.1uF + 10uF) |
| دبوس 73 | XTAL1 — Crystal oscillator input (25 MHz) |
| دبوس 74 | XTAL2 — Crystal oscillator output (25 MHz) |
| دبوس 75 | GND — Ground |
| دبوس 76 | TX_ER_PORT5 — Port 5 transmit error indicator |
| دبوس 77 | TX_EN_PORT5 — Port 5 transmit enable (extended MII) |
| دبوس 78 | TXD_PORT5_0 — Port 5 transmit data 0 |
| دبوس 79 | TXD_PORT5_1 — Port 5 transmit data 1 |
| دبوس 80 | TXD_PORT5_2 — Port 5 transmit data 2 |
| دبوس 81 | TXD_PORT5_3 — Port 5 transmit data 3 |
| دبوس 82 | TX_CLK_PORT5 — Port 5 transmit clock (extended MII) |
| دبوس 83 | RX_DV_PORT5 — Port 5 receive data valid |
| دبوس 84 | RXD_PORT5_0 — Port 5 receive data 0 |
| دبوس 85 | RXD_PORT5_1 — Port 5 receive data 1 |
| دبوس 86 | RXD_PORT5_2 — Port 5 receive data 2 |
| دبوس 87 | RXD_PORT5_3 — Port 5 receive data 3 |
| دبوس 88 | RX_ER_PORT5 — Port 5 receive error |
| دبوس 89 | RX_CLK_PORT5 — Port 5 receive clock |
| دبوس 90 | MDIO_PORT5 — Port 5 MII management data I/O |
| دبوس 91 | MDC_PORT5 — Port 5 MII management clock |
| دبوس 92 | GND — Ground |
| دبوس 93 | TDI — JTAG test data in |
| دبوس 94 | TDO — JTAG test data out |
| دبوس 95 | TMS — JTAG test mode select |
| دبوس 96 | TCK — JTAG test clock |
| دبوس 97 | TRSTN — JTAG test reset (active low) |
| دبوس 98 | VDDIO — 3.3V I/O supply |
| دبوس 99 | NC — Not connected (per datasheet) |
| دبوس 100 | NC — Not connected (per datasheet) |
| دبوس 101 | GND — Ground |
| دبوس 102 | VDD_PLL — PLL analog supply (3.3V, decouple with 0.1uF) |
| دبوس 103 | GND_PLL — PLL analog ground |
| دبوس 104 | NC — Not connected (per datasheet) |
| دبوس 105 | NC — Not connected (per datasheet) |
| دبوس 106 | VDDIO — 3.3V I/O supply |
| دبوس 107 | GPIO0 — General-purpose I/O 0 |
| دبوس 108 | GPIO1 — General-purpose I/O 1 |
| دبوس 109 | GPIO2 — General-purpose I/O 2 |
| دبوس 110 | GPIO3 — General-purpose I/O 3 |
| دبوس 111 | GPIO4 — General-purpose I/O 4 |
| دبوس 112 | GPIO5 — General-purpose I/O 5 |
| دبوس 113 | GPIO6 — General-purpose I/O 6 |
| دبوس 114 | GPIO7 — General-purpose I/O 7 |
| دبوس 115 | GND — Ground |
| دبوس 116 | REF_CLK — Reference clock output (25 MHz) |
| دبوس 117 | CLK_OUT — Buffered clock output |
| دبوس 118 | NC — Not connected (per datasheet) |
| دبوس 119 | NC — Not connected (per datasheet) |
| دبوس 120 | VDDIO — 3.3V I/O supply |
| دبوس 121 | NC — Not connected (per datasheet) |
| دبوس 122 | NC — Not connected (per datasheet) |
| دبوس 123 | NC — Not connected (per datasheet) |
| دبوس 124 | NC — Not connected (per datasheet) |
| دبوس 125 | NC — Not connected (per datasheet) |
| دبوس 126 | NC — Not connected (per datasheet) |
| دبوس 127 | NC — Not connected (per datasheet) |
| دبوس 128 | NC — Not connected (per datasheet) |
التطبيقات النموذجية
KSZ8895MQXI مناسب لـ 6 التطبيقs: Industrial Ethernet Switch, Automotive Gateway ECU, IP Surveillance NVR/DVR, Building Automation Controller, IoT Edge Gateway, Power Substation Communications.
Industrial Ethernet Switch
The KSZ8895MQXI's five integrated 10/100Base-TX PHYs and 1.4 Gbps non-blocking switch fabric make it ideal for compact industrial five-port switches. The device supports IEEE 802.1Q VLAN tagging for network segmentation in factory automation, IEEE 802.1p QoS with four priority queues for deterministic PROFINET/EtherCAT traffic scheduling, and operates from -40C to +85C for harsh factory environments. Placed on a four-layer PCB with the integrated PHYs directly driving transformer-less magnetics modules, it eliminates the need for external PHY ICs and reduces BOM by approximately 30% compared to discrete five-port designs. The AEC-Q100 qualification ensures reliability in 24/7 industrial installations.
موصى به
Automotive Gateway ECU
In automotive gateway ECUs, the KSZ8895MQXI aggregates multiple in-vehicle network domains (CAN, LIN, Ethernet) onto a backbone Ethernet switch. The device's AEC-Q100 qualification and HP Auto-MDIX on all five ports allow seamless integration of automotive Ethernet PHYs without crossover cables, while the 4K-entry MAC address table supports dozens of in-vehicle ECUs. The integrated 1.4 Gbps fabric handles full-duplex traffic from ADAS sensors, infotainment, and diagnostic interfaces simultaneously with wire-speed forwarding and no head-of-line blocking.
موصى به
IP Surveillance NVR/DVR
The KSZ8895MQXI enables five-port managed Ethernet switches inside IP surveillance NVR and DVR systems, connecting multiple PoE IP cameras to a recording engine. Its 64 KB frame buffer absorbs burst traffic from multiple 1080p H.264 streams (each ~4 Mbps), and per-port programmable rate limiting prevents any single camera from saturating uplink bandwidth. The device's 4K-entry MAC table accommodates hundreds of cameras in cascaded deployments, and the SPI management interface allows the host SoC to configure VLANs for isolating camera traffic from the management network.
موصى به
Building Automation Controller
In building automation controllers, the KSZ8895MQXI serves as the central Ethernet switch connecting BACnet/IP, Modbus TCP, and KNX/IP subsystems. The IEEE 802.1Q VLAN feature segments traffic between HVAC, lighting, and security subsystems on a single five-port switch, while the -40C to +85C industrial temperature range supports unconditioned electrical-room installations. The integrated 1.8 V LDO simplifies power tree design, and the MII/RMII host interface allows a low-cost Cortex-M0 host MCU to perform web-server configuration.
موصى به
IoT Edge Gateway
IoT edge gateways use the KSZ8895MQXI to aggregate multiple Ethernet-connected sensors and actuators onto a single uplink to the cloud. The five ports support star topologies for sensor clusters, while the 64 KB frame buffer and wire-speed forwarding handle intermittent burst traffic from time-sensitive industrial IoT protocols. The integrated HP Auto-MDIX eliminates cable-type restrictions in field installations, and the SPI/I2C management interface allows an embedded Linux SoC to query per-port statistics for remote diagnostics over MQTT or OPC-UA.
موصى به
Power Substation Communications
In IEC 61850 power substation communications, the KSZ8895MQXI provides five managed Ethernet ports for connecting protection relays, phasor measurement units (PMUs), and SCADA gateways. The device's industrial -40C to +85C temperature range operates in unheated substation cabinets, and the IEEE 802.1Q VLAN with 16 groups enables traffic separation between GOOSE messaging, sampled-values streams, and MMS reporting. The 1.4 Gbps fabric with QoS priority queuing guarantees bounded latency for protection messages while bulk SCADA polling uses best-effort queues.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ KSZ8895MQXI — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | KSZ8895RQXIA | KSZ8895MLUB | KSZ8895FQX | KSZ8995MA |
|---|---|---|---|---|---|
| Package | 128-PQFP (14x20) | 128-PQFP (14x20) - same | 128-PQFP (14x20) - same | 128-PQFP (14x20) - same | 128-PQFP (14x20) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Number of Ports | 5 (10/100Base-TX) | 5 (10/100Base-TX) | 5 (10/100Base-TX) | 5 (10/100Base-TX) | 5 (10/100Base-TX) |
| Integrated PHYs | 5 PHYs | 5 PHYs | 5 PHYs | 5 PHYs | 3 PHYs |
| AEC-Q100 | Qualified | Grade-2 Qualified | Not qualified | Not qualified | Not qualified |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | 0C to +70C | -40C to +85C |
| Switch Fabric Bandwidth | 1.4 Gbps | 1.4 Gbps | 1.4 Gbps | 1.4 Gbps | 1.0 Gbps |
| VLAN Groups | 16 (IEEE 802.1Q) | 16 (IEEE 802.1Q) | 16 (IEEE 802.1Q) | 16 (IEEE 802.1Q) | 16 (IEEE 802.1Q) |
| Unit Price (qty 1) | $8.42 | $9.10 (estimate) | $8.20 (estimate) | $7.80 (estimate) | $6.50 (estimate) |
أبرز الفروقات
- AEC-Q100 qualified with full -40C to +85C industrial temperature range (مقابلKSZ8895FQX)
- Five integrated 10/100 PHYs eliminate external PHY ICs (مقابلKSZ8995MA)
- Full 1.4 Gbps non-blocking switch fabric with QoS priority queuing (مقابلKSZ8863RLLI)
ملاحظات التصميم
The 128-pin PQFP package (14x20 mm body, 0.5 mm pitch) requires a four-layer PCB minimum for proper return-path integrity on the MII/RMII bus. Estimated: signal trace impedance should be 50 ohm single-ended with continuous ground reference plane beneath all MII/RMII traces. Each port's differential pair (TX_P/N, RX_P/N) should be routed as 100 ohm differential with intra-pair length matching within 2 mm. Place a 10 uF tantalum plus 0.1 uF ceramic decoupling capacitor within 3 mm of every VDDIO pin.
Power sequencing is critical for the KSZ8895MQXI: VDDIO (3.3 V) must ramp up before the internal 1.8 V LDO output (VDDCORE) is observed by the internal logic. The integrated LDO requires a 10 uF bulk plus 0.1 uF ceramic on VDDCORE (pin 11, 72) for stability. Estimated: total power consumption at full 100 Mbps load on all five ports is approximately 825 mW (250 mA at 3.3 V), so design the 3.3 V rail for at least 400 mA peak with 100 mV maximum ripple.
The TEST pin (pin 64) must be tied directly to GND in the application circuit - leaving it floating may cause factory-test mode to engage and disrupt normal switch operation. The RESETN pin (pin 63) requires an external 10 kohm pull-up to VDDIO and a 100 nF capacitor to GND for proper power-on-reset timing per the datasheet. Estimated: leaving the crystal load capacitors off XTAL1/XTAL2 (pins 73/74) is a common cause of link-up failure - use a 25 MHz crystal with 18 pF load capacitors matching the crystal manufacturer's CL specification.
For the MII host interface running at 25 MHz, route all MII data/clock signals on the same PCB layer with length-matched traces (within 10 mm of the clock). Keep MII signals at least 3 mm away from the Port 1-5 PHY differential pairs to avoid coupling of the 25 MHz harmonics into the analog front-end. Estimated: at 100 Mbps operation, the analog TX/RX pairs produce 31 MHz fundamental; route these on the top layer over a continuous ground plane with via stitching every 25 mm around the perimeter.
معلومات الامتثال
AEC-Q100 qualified per Microchip product page. RoHS and REACH compliant per DigiKey product listing. Halogen-free per Microchip environmental compliance documentation.
