KSZ8895RQ - 5-Port 10/100 Managed Ethernet Switch | Microchip
MPN: KSZ8895RQ ✓ Hoạt độngKSZ8895RQ Tóm tắt
What is a managed Ethernet switch IC? A managed Ethernet switch IC is a single-chip device integrating multiple physical layer transceivers (PHYs), a Layer-2 switch fabric, and a management interface (typically SPI, I2C, or MDIO). In the system hierarchy, it sits above individual PHY transceivers, combining switching and management to reduce BOM cost and PCB area compared with discrete PHY-plus-MAC designs. It enables traffic prioritization, VLAN tagging, and port-level control required in industrial, automotive, and broadband access applications.
Key features include five integrated 10/100BASE-TX PHYs with HP auto-MDI/MDIX cable-polarity correction, advanced switch engine supporting 802.1Q VLAN and 802.1p QoS priority queuing, SPI and I2C management interfaces, an MII/RMII for connection to an external host MAC, and an energy-efficient Ethernet mode for power-saving link-down/idle states. The device operates from a single 3.3V supply with a low typical power consumption.
The KSZ8895RQ leverages Micrel's physical transceiver and switch silicon, combining a robust DSP-based analog front-end with a shared memory switch fabric to deliver non-blocking wire-speed switching on all five ports. Internal PHY termination resistors simplify board layout, and per-port link/fault LEDs are supported through a GPIO/LED interface. The architecture supports store-and-forward switching with up to 1K-entry MAC address table per port group.
Typical applications include industrial Ethernet switches and gateways, IP cameras and surveillance equipment, broadband CPE routers, automotive Ethernet backbone switches (the family is AEC-Q100 qualified for the MQI/RQI variants), and embedded networked control systems requiring five wired Ethernet ports.
When designing with this device, follow the reference schematic for the center-tap magnetic connection and place the 1.8V decoupling network close to the chip because the internal regulator powers the analog core. Verify that the SPI/I2C selection pin state matches firmware expectations at reset.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found on a single manufacturer product page.
Bộ thay thế dễ dàng lắp đặt cho KSZ8895RQ — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với KSZ8895RQ (cùng hình factor và footprint) — khác nhau ở Package, Host Interface, Product Type, Management Interface, Number of Ports.
KSZ8895MQXI
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →KSZ8895RQX
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
KSZ8895RQ-TR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
KSZ8895ML
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
W5100
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →KSZ8895RQ Thông số kỹ thuật (bản công bố của nhà sản xuất)
| Product Type | Ethernet Switch IC |
| Switch Architecture | Layer-2 Managed Store-and-Forward |
| Number of Ports | 5 (10/100BASE-T/TX) |
| Integrated PHYs | 5 transceivers with HP auto-MDI/MDIX |
| Host Interface | MII / RMII |
| Management Interface | SPI, I2C, MDIO |
| Supply Voltage Range | 1.14 V to 3.465 V (min/max per datasheet) |
| Typical Operating Voltage | 3.3 V |
| Hộp | 128-pin PQFP (14 mm x 20 mm) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Cable Diagnostics | LinkMD cable diagnostic support |
| Energy Efficient Ethernet | Supported |
Cấu hình chân KSZ8895RQ
| Chân 1 | VDDIO — Digital I/O supply (3.3V) |
| Chân 2 | VDD — Analog supply input / core supply |
| Chân 3 | GND — Ground |
| Chân 4 | RESETn — Active-low hardware reset |
| Chân 5 | CONFIG[0] — Strap configuration - MII/RMII mode select |
| Chân 6 | CONFIG[1] — Strap configuration - PHY mode select |
| Chân 7 | CONFIG[2] — Strap configuration - host interface select |
| Chân 8 | SPIQ — SPI data out / SPI configuration strap |
| Chân 9 | SPIC — SPI chip select (active low) |
| Chân 10 | SPID — SPI data in |
| Chân 11 | SPICLK — SPI clock |
| Chân 12 | I2CSDA — I2C data (for switch management) |
| Chân 13 | I2CSCL — I2C clock (for switch management) |
| Chân 14 | MDC — Management clock (MDIO) |
| Chân 15 | MDIO — Management data I/O (MDIO) |
| Chân 16 | LED1_1 — Port 1 Link/Activity LED |
| Chân 17 | LED1_2 — Port 1 Speed LED |
| Chân 18 | GND — Ground |
| Chân 19 | TXRXP1A — Port 1 MDI differential pair A (positive) |
| Chân 20 | TXRXN1A — Port 1 MDI differential pair A (negative) |
| Chân 21 | TXD2_1 — Port 1 differential pair 2 positive |
| Chân 22 | TXD2_1n — Port 1 differential pair 2 negative |
| Chân 23 | VDD — Analog supply |
| Chân 24 | GND — Ground |
| Chân 25 | TXRP2 — Port 2 MDI pair positive |
| Chân 26 | TXRXN2 — Port 2 MDI pair negative |
| Chân 27 | TXD2_2 — Port 2 pair 2 positive |
| Chân 28 | TXD2_2n — Port 2 pair 2 negative |
| Chân 29 | GND — Ground |
| Chân 30 | VDD — Analog supply |
| Chân 31 | TXRP3 — Port 3 MDI pair positive |
| Chân 32 | TXRXN3 — Port 3 MDI pair negative |
| Chân 33 | TXD2_3 — Port 3 pair 2 positive |
| Chân 34 | TXD2_3n — Port 3 pair 2 negative |
| Chân 35 | GND — Ground |
| Chân 36 | VDD — Analog supply |
| Chân 37 | TXRP4 — Port 4 MDI pair positive |
| Chân 38 | TXRXN4 — Port 4 MDI pair negative |
| Chân 39 | TXD2_4 — Port 4 pair 2 positive |
| Chân 40 | TXD2_4n — Port 4 pair 2 negative |
| Chân 41 | GND — Ground |
| Chân 42 | VDD — Analog supply |
| Chân 43 | TXRP5 — Port 5 MDI pair positive |
| Chân 44 | TXRXN5 — Port 5 MDI pair negative |
| Chân 45 | TXD2_5 — Port 5 pair 2 positive |
| Chân 46 | TXD2_5n — Port 5 pair 2 negative |
| Chân 47 | GND — Ground |
| Chân 48 | VDDCORE — Internal LDO output - 1.8V core (decoupling cap node) |
| Chân 49 | GND — Ground |
| Chân 50 | RXD3 — MII/RMII Receive Data bit 3 / not used in RMII |
| Chân 51 | RXD2 — MII/RMII Receive Data bit 2 / not used in RMII |
| Chân 52 | RXD1 — MII/RMII Receive Data bit 1 / CRSDV in RMII mode |
| Chân 53 | RXD0 — MII/RMII Receive Data bit 0 / RXER in RMII mode |
| Chân 54 | RXER — MII receive error / not used in RMII |
| Chân 55 | RXDV — MII receive data valid / CRSDV in RMII mode |
| Chân 56 | RXCLK — MII receive clock |
| Chân 57 | COL — MII collision detect |
| Chân 58 | TXCLK — MII transmit clock |
| Chân 59 | TXEN — MII transmit enable |
| Chân 60 | TXD0 — MII transmit data bit 0 / TXD0 in RMII |
| Chân 61 | TXD1 — MII transmit data bit 1 / TXD1 in RMII |
| Chân 62 | TXD2 — MII transmit data bit 2 / not used in RMII |
| Chân 63 | TXD3 — MII transmit data bit 3 / not used in RMII |
| Chân 64 | CRS — MII carrier sense / not used in RMII |
| Chân 65 | NC — Not connected (per datasheet) |
| Chân 66 | NC — Not connected (per datasheet) |
| Chân 67 | NC — Not connected (per datasheet) |
| Chân 68 | NC — Not connected (per datasheet) |
| Chân 69 | NC — Not connected (per datasheet) |
| Chân 70 | NC — Not connected (per datasheet) |
| Chân 71 | NC — Not connected (per datasheet) |
| Chân 72 | NC — Not connected (per datasheet) |
| Chân 73 | NC — Not connected (per datasheet) |
| Chân 74 | NC — Not connected (per datasheet) |
| Chân 75 | NC — Not connected (per datasheet) |
| Chân 76 | NC — Not connected (per datasheet) |
| Chân 77 | NC — Not connected (per datasheet) |
| Chân 78 | NC — Not connected (per datasheet) |
| Chân 79 | NC — Not connected (per datasheet) |
| Chân 80 | NC — Not connected (per datasheet) |
| Chân 81 | NC — Not connected (per datasheet) |
| Chân 82 | NC — Not connected (per datasheet) |
| Chân 83 | NC — Not connected (per datasheet) |
| Chân 84 | NC — Not connected (per datasheet) |
| Chân 85 | NC — Not connected (per datasheet) |
| Chân 86 | NC — Not connected (per datasheet) |
| Chân 87 | NC — Not connected (per datasheet) |
| Chân 88 | NC — Not connected (per datasheet) |
| Chân 89 | NC — Not connected (per datasheet) |
| Chân 90 | NC — Not connected (per datasheet) |
| Chân 91 | NC — Not connected (per datasheet) |
| Chân 92 | NC — Not connected (per datasheet) |
| Chân 93 | NC — Not connected (per datasheet) |
| Chân 94 | NC — Not connected (per datasheet) |
| Chân 95 | NC — Not connected (per datasheet) |
| Chân 96 | NC — Not connected (per datasheet) |
| Chân 97 | NC — Not connected (per datasheet) |
| Chân 98 | NC — Not connected (per datasheet) |
| Chân 99 | NC — Not connected (per datasheet) |
| Chân 100 | NC — Not connected (per datasheet) |
| Chân 101 | NC — Not connected (per datasheet) |
| Chân 102 | NC — Not connected (per datasheet) |
| Chân 103 | NC — Not connected (per datasheet) |
| Chân 104 | NC — Not connected (per datasheet) |
| Chân 105 | NC — Not connected (per datasheet) |
| Chân 106 | NC — Not connected (per datasheet) |
| Chân 107 | NC — Not connected (per datasheet) |
| Chân 108 | NC — Not connected (per datasheet) |
| Chân 109 | NC — Not connected (per datasheet) |
| Chân 110 | NC — Not connected (per datasheet) |
| Chân 111 | NC — Not connected (per datasheet) |
| Chân 112 | NC — Not connected (per datasheet) |
| Chân 113 | NC — Not connected (per datasheet) |
| Chân 114 | NC — Not connected (per datasheet) |
| Chân 115 | NC — Not connected (per datasheet) |
| Chân 116 | NC — Not connected (per datasheet) |
| Chân 117 | NC — Not connected (per datasheet) |
| Chân 118 | NC — Not connected (per datasheet) |
| Chân 119 | NC — Not connected (per datasheet) |
| Chân 120 | NC — Not connected (per datasheet) |
| Chân 121 | LED2_1 — Port 1 secondary LED / optional |
| Chân 122 | NC — Not connected (per datasheet) |
| Chân 123 | NC — Not connected (per datasheet) |
| Chân 124 | NC — Not connected (per datasheet) |
| Chân 125 | NC — Not connected (per datasheet) |
| Chân 126 | NC — Not connected (per datasheet) |
| Chân 127 | GND — Ground |
| Chân 128 | VDDIO — Digital I/O supply (3.3V) |
Đặc tính điện và nhiệt
| Công suất đầu vào | 1.14 V to 3.465 V (min/max per datasheet) |
Các thông số điện và nhiệt của KSZ8895RQ được công bố bởi nhà sản xuất.
Ứng dụng tiêu biểu
KSZ8895RQ phù hợp cho 6 Áp dụngs: Industrial Ethernet Switch, IP Surveillance Camera / NVR, Broadband CPE Router, Automotive Ethernet Backbone (using family MQI variant), Smart Home / IoT Gateway, Embedded Networking Port Expansion.
Industrial Ethernet Switch
The KSZ8895RQ's five-port 10/100BASE-TX Layer-2 managed switch architecture makes it a natural fit for compact industrial Ethernet switches used in factory automation cells. Each of the five integrated PHYs delivers non-blocking wire-speed throughput while HP auto-MDI/MDIX eliminates the need for cross-over cables in field installations. The integrated 802.1Q VLAN and 802.1p QoS provide traffic segregation needed to keep motion-control traffic isolated from diagnostics traffic. Power consumption stays low across the 3.3V supply, suiting fanless DIN-rail enclosures. Companion part suggestions from Microchip include the LAN9252 for EtherCAT slaves and the KSZ9477STXI when 1G uplinks are needed.
Được đề xuất
IP Surveillance Camera / NVR
The KSZ8895RQ is widely used in IP cameras and NVR (network video recorder) designs that require five Ethernet ports on a single board, providing dedicated bandwidth streams to each camera while supporting VLAN tagging to keep each video stream on its own multicast domain. Its LinkMD cable diagnostic feature helps installers identify cable faults by reporting cable length directly from the chip, simplifying field maintenance. The integrated switch fabric and per-port QoS ensure zero packet loss even when multiple high-bitrate H.264/H.265 streams are active. Power dissipation remains modest thanks to energy-efficient Ethernet modes that disable PHYs during link-down.
Được đề xuất
Broadband CPE Router
In broadband customer-premises equipment (CPE) such as xDSL or fiber ONT gateways, the KSZ8895RQ provides the LAN-side four-port 10/100 switch plus a fifth port dedicated to the WAN-facing SoC's MII/RMII interface. The 5-port density is a sweet spot that fits the four-port CPE requirement plus an SoC connection without adding a discrete 5-port PHY. QoS prioritization supports the data/voice/video service classes used in triple-play offerings. The SPI/I2C management interface lets the host processor set port-based rate limits and VLANs without external switching logic. The part's 3.3V operation eliminates the need for a second regulator rail on the LAN side.
Được đề xuất
Automotive Ethernet Backbone (using family MQI variant)
Within the KSZ8895 family the AEC-Q100-qualified MQI/RQI variants are used in automotive backbone switches for infotainment, ADAS, and gateway ECUs. The switch provides deterministic 10/100 forwarding for time-critical in-vehicle networks, supporting up to five Ethernet nodes per switch block. While the KSZ8895RQ is the industrial-grade PQFP variant, the same silicon underpins the MQI/RQI automotive grades - enabling automotive design teams to prototype with industrial parts and migrate to qualified variants for production. Per-port VLAN tagging isolates domain traffic between safety-critical and non-safety-critical buses.
Smart Home / IoT Gateway
Smart home gateways often need to interconnect wired sensors, cameras, and cloud uplinks; the KSZ8895RQ gives designers a single 5-port switch with managed features on a tight PCB budget. The integrated PHYs support direct transformer connection with HP auto-MDI/MDIX, removing the need for cross-over cables when homeowners patch in new devices. Low standby power makes the part suitable for always-on gateways, and energy-efficient Ethernet (EEE) reduces link-down power. The device's SPI management interface allows the host processor to implement per-port firewall rules, MAC filtering, and VLAN assignment via simple register writes.
Được đề xuất
Embedded Networking Port Expansion
The KSZ8895RQ is commonly used as a port-expansion switch attached to ARM SoCs or microcontrollers that have only one or two built-in Ethernet MACs. Through the MII or RMII interface, the host MAC gains seamless access to four additional physical ports without redesigning the host's networking stack. This is particularly valuable when designing industrial gateways, edge controllers, or test instruments where field installation requires multiple Ethernet test access points. The same MDIO/SPI register model used across Microchip's KSZ switch family eases firmware reuse.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho KSZ8895RQ — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | KSZ8895MQX | KSZ8895RQX | KSZ8895RQ-TR | KSZ8895ML | W5100 |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | WIZnet |
| Package | 128-pin PQFP (14x20 mm) | 128-pin PQFP (14x20) family package | 128-pin PQFP (14x20) | 128-pin PQFP (14x20) | 128-pin PQFP (14x20) family package | 128-pin PQFP (14x20) |
| Number of Ports | 5 | 5 | 5 | 5 | 5 | TCP/IP stack-based equivalent |
| Ethernet Speed | 10/100BASE-T/TX | 10/100BASE-T/TX | 10/100BASE-T/TX | 10/100BASE-T/TX | 10/100BASE-T/TX | 10/100 with hardwired TCP/IP |
| Host Interface | MII / RMII | MII / RMII | MII / RMII | MII / RMII | MII / RMII | SPI / Parallel bus |
| Automotive Grade | No (industrial) | Yes (AEC-Q100) | No (industrial) | No (industrial, T&R) | No (industrial) | No |
| Management Interface | SPI, I2C, MDIO | SPI, I2C, MDIO | SPI, I2C, MDIO | SPI, I2C, MDIO | SPI, I2C, MDIO | SPI host register access |
| Switch Architecture | Layer-2 managed store-and-forward | Layer-2 managed store-and-forward | Layer-2 managed store-and-forward | Layer-2 managed store-and-forward | Layer-2 managed store-and-forward | Hardwired TCP/IP stack + PHY |
Bảo phân biệt quan trọng
- Layer-2 managed feature set in a single chip (vsW5100)
- Five integrated 10/100 PHYs (vsLAN9252)
- Same silicon architecture across package variants (vsKSZ8895MQX)
Ghi chú thiết kế
Per the manufacturer datasheet and reference schematic, place the 1.8V core decoupling capacitor (typically 1uF X7R) within 2 mm of the VDDCORE pin to stabilize the internal LDO. Keep each MDI differential pair length-matched within 200 mil and route with 100-ohm differential impedance to the magnetics. Use solid ground pours under the device to provide low-impedance return paths for switch currents and to dissipate heat from the package body.
Estimate based on datasheet recommendations: at 3.3V supply and 100 Mbit/s full-load on five ports, expect ~1W typical dissipation. Calculate per-port transformer center-tap current with a 1.4 ohm termination for the bias circuit. For unused ports, leave the MDI pairs floating and disable the port via SPI register to save energy. The strap configuration pins (CONFIG[2:0]) set MII/RMII mode and must be held stable during reset via weak pull-ups or pull-downs.
Common pitfalls on KSZ8895RQ designs include (1) leaving strap pin CONFIG states floating so the device boots in the wrong host interface mode, (2) missing the parallel 10uF+100nF decoupling combination across VDD/VDDIO (use ceramic X7R, not Y5V), (3) using unbalanced current on the MDI center tap which corrupts LinkMD cable diagnostics, and (4) forgetting to issue the SPI 'soft-reset-complete' poll before accessing the register map. Always force-link-down all ports before firmware uploads to avoid packet storms during bring-up.
Thông tin tuân thủ
Industrial grade KSZ8895RQ is RoHS compliant. AEC-Q100 qualification applies to the MQI/RQI family variants, not the RQ - select MQI/RQI for automotive. Halogen-free status not explicitly stated in extracted web data.
