KSZ9897STXI - 7-Port GbE Managed Switch | Microchip
MPN: KSZ9897STXI ✓ Hoạt độngKSZ9897STXI Tóm tắt
What is a managed Ethernet switch IC? A managed Ethernet switch is a single-chip device that integrates multiple physical layer transceivers (PHYs), Media Access Controllers (MACs), and a layer-2 packet-forwarding engine with configurable features such as VLANs, QoS, IGMP snooping, and port mirroring. In the component taxonomy, the KSZ9897 falls under Ethernet switch IC -> network interface IC -> interface IC -> integrated circuit. Managed switch ICs replace discrete PHY-plus-MAC-plus-CPU designs, reducing BOM count and PCB area while adding software-controlled traffic management.
Key features of the KSZ9897STXI include seven integrated gigabit ports, full wire-speed non-blocking switching, IEEE 802.1Q VLAN support, IPv4/IPv6 QoS with four priority queues per port, IEEE 1588v2 hardware timestamping, LinkMD cable diagnostic, tail-tag-free operation, and flexible SGMII/RGMII/MII/RMII expansion. It supports both store-and-forward and cut-through switching modes, includes an integrated EEPROM controller, and offers comprehensive cable diagnostics for proactive fault detection.
The architecture pairs five integrated 10/100/1000 BASE-T PHYs with two selectable SGMII/RGMII/MII/RMII interfaces that allow designers to connect external PHYs, processors, or another switch. An integrated ARM-class management CPU offloads ACL processing, IGMP/MLD snooping, and storm control. The device supports jumbo frames up to 9 KB, 16K MAC address entries, and 1 MB of shared packet buffer memory, enabling low-latency line-rate operation at full gigabit wire speed on all ports simultaneously.
Typical applications include industrial Ethernet switches, building automation gateways, IP surveillance NVRs, automotive Ethernet zonal gateways, smart energy / substation automation equipment, and IoT edge aggregation switches. The wide industrial temperature range and LinkMD diagnostics make it well suited for unattended or harsh-environment deployments.
When designing with this part, ensure the integrated 1.2V and 2.5V LDO regulators are bypassed with the recommended capacitor network and that the 25 MHz reference clock meets the +/-50 ppm accuracy spec. The exposed pad must be soldered to a sufficient ground copper pour for thermal dissipation; without it, junction temperature can exceed 105C at full gigabit loading.
This page synthesizes distributor pricing, drop-in alternatives, and design notes not found in the manufacturer datasheet alone, providing practical engineering context for selecting the KSZ9897STXI versus competing 7-port GbE switch ICs.
Bộ thay thế dễ dàng lắp đặt cho KSZ9897STXI — 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 KSZ9897STXI (cùng hình factor và footprint) — khác nhau ở Cable Diagnostics, Jumbo Frame Support, Operating Temperature, Package, Product Type.
KSZ9897STXI-TR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
KSZ9897RTXI
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →KSZ9897STXCA
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
KSZ9897STXI-EVAL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
DP83869HMRGZR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →KSZ9897STXI Tỷ lệ tối đa & tính chất điện
| Product Type | 7-Port Gigabit Ethernet Managed Switch IC |
| Number of Ports | 7 |
| Integrated PHYs | 5 x 10/100/1000 Mbps BASE-T |
| Configurable MAC Interfaces | 2 x SGMII / RGMII / MII / RMII |
| Switching Bandwidth | 14 Gbps non-blocking |
| Forwarding Rate | 1.4 Mpps (wire-speed, 64-byte packets) |
| MAC Address Table | 16K entries |
| Packet Buffer | 1 MB shared |
| Jumbo Frame Support | Up to 9 KB |
| Management Interface | I2C, SPI, MIIM (MDC/MDIO) |
| VLAN Support | IEEE 802.1Q, 4K VLAN entries |
| QoS Queues per Port | 4 |
| Time Stamping | IEEE 1588v2 hardware timestamping |
| Energy Efficient Ethernet | IEEE 802.3az EEE supported |
| Wake-on-LAN | Yes |
| Cable Diagnostics | LinkMD TDR-based |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Điện áp cung cấp | 1.2V (core), 2.5V and 3.3V (I/O) |
| Hộp | 128-pin TQFP-EP, 14x14 mm |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Hướng dẫn cấu hình chân KSZ9897STXI 128-pin tqfp-ep, 14x14 mm
Cấu hình chân cho KSZ9897STXI (128-pin tqfp-ep, 14x14 mm gói). Số thứ tự chân, chức năng và sơ đồ kết nối được xác định trong tài liệu thông số kỹ thuật của nhà sản xuất. Tham khảo nó để biết footprint và hướng dẫn hàn chính xác.
Không có dữ liệu chân cụ thể sẵn có cho KSZ9897STXI.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
KSZ9897STXI phù hợp cho 7 Áp dụngs: Industrial Ethernet Switch, IP Surveillance NVR, Building Automation Gateway, Automotive Ethernet Zonal Gateway, IoT Edge Aggregation Switch, Smart Energy / Substation Automation, Industrial Router with Multi-WAN Failover.
Industrial Ethernet Switch
The KSZ9897STXI is purpose-built for unmanaged and lightly-managed industrial Ethernet switches used in factory automation, process control, and substation networking. Its five integrated 10/100/1000 BASE-T PHYs and two SGMII/RGMII/MII/RMII ports enable a complete 7-port gigabit switch on a single PCB, eliminating external PHY parts and reducing BOM cost by 30-40%. The industrial -40C to +85C operating range, LinkMD TDR-based cable diagnostics, and IEEE 1588v2 hardware timestamping make it ideal for time-critical PROFINET, EtherCAT, and IEC 61850-3 substation deployments. The 128-TQFP-EP package provides robust thermal performance for sealed enclosure designs with limited airflow.
Được đề xuất
IP Surveillance NVR
Network video recorders (NVRs) and IP camera aggregation switches leverage the KSZ9897STXI's seven gigabit ports to connect multiple high-bandwidth IP cameras (30-60 Mbps each at 4K resolution) without external switching hardware. The device's 1 MB packet buffer and 9 KB jumbo frame support prevent frame drops during burst recording, while the four QoS queues per port enable strict priority for video traffic over best-effort data. Hardware ACLs and IGMP/MLD snooping optimize multicast video streams from multiple cameras, and the integrated LinkMD cable diagnostics help installers pinpoint cable faults across large surveillance installations.
Được đề xuất
Building Automation Gateway
Smart building controllers use the KSZ9897STXI to aggregate BACnet/IP, Modbus TCP, and KNX traffic across HVAC, lighting, and access-control subsystems. The seven gigabit ports support both daisy-chained ring topologies and star configurations, while IEEE 1588v2 hardware timestamping enables synchronized lighting and HVAC scheduling. The industrial temperature range and LinkMD cable diagnostics deliver reliable operation in mechanical rooms, ceiling plenums, and outdoor enclosures. The integrated 16K MAC address table accommodates large building networks with hundreds of devices per gateway.
Được đề xuất
Automotive Ethernet Zonal Gateway
The KSZ9897STXI powers zonal gateways in modern automotive E/E architectures, aggregating 100BASE-T1 and 1000BASE-T1 links from ADAS sensors, infotainment ECUs, and body controllers. The industrial temperature rating combined with the AEC-Q100-compatible process flow makes it suitable for in-cabin and under-hood zones. The two SGMII interfaces support automotive PHYs such as 100BASE-T1, while the integrated PHYs serve diagnostic and OBD-II ports. IEEE 802.1Q VLAN tagging with 4K entries enables secure separation of safety-critical, driver-assist, and infotainment traffic domains.
Được đề xuất
IoT Edge Aggregation Switch
Industrial IoT edge gateways leverage the KSZ9897STXI to aggregate traffic from dozens of Modbus, EtherNet/IP, and MQTT-over-TCP devices into a single uplink to the cloud or SCADA system. The device's hardware ACLs and storm control prevent faulty edge devices from flooding the uplink, while the integrated cable diagnostics enable remote troubleshooting. The two SGMII ports can drive SFP modules for fiber uplinks in electrically noisy industrial environments, and the 1.4 Mpps forwarding rate ensures line-rate throughput even with 64-byte IoT telemetry frames at full gigabit wire speed.
Được đề xuất
Smart Energy / Substation Automation
The KSZ9897STXI meets the demanding requirements of IEC 61850-3 substation communication networks, where precise time synchronization and electromagnetic robustness are mandatory. IEEE 1588v2 hardware timestamping provides the sub-microsecond accuracy required for synchrophasor and GOOSE messaging, while the industrial temperature range and the device's tolerance to wide supply voltage variation ensure reliable operation in harsh substation environments. The seven gigabit ports support redundant ring topologies with sub-50 ms failover, critical for protection relay networks where communication loss can compromise grid stability.
Được đề xuất
Industrial Router with Multi-WAN Failover
Small-form-factor industrial routers and firewalls use the KSZ9897STXI to provide multi-WAN failover between fiber, copper, and cellular (via external SGMII-connected modem) uplinks. The two SGMII/RGMII/MII/RMII ports connect to a host processor running the routing stack, while five integrated PHYs serve LAN-side Ethernet ports. The device's VLAN support and hardware ACLs offload packet classification from the host CPU, freeing resources for VPN encryption and DPI. The industrial temperature range and LinkMD cable diagnostics ensure reliable operation in remote outdoor enclosures and roadside cabinets.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho KSZ9897STXI — 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 | KSZ9897STXI-TR | KSZ9897RTXI | KSZ9897STXCA | KSZ9897STXI-EVAL |
|---|---|---|---|---|---|
| Package | 128-TQFP-EP (14x14 mm) | 128-TQFP-EP (14x14 mm) - same | 128-TQFP-EP (14x14 mm) - same | 128-TQFP-EP (14x14 mm) - same | 128-TQFP-EP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Number of Ports | 7 | 7 | 7 | 7 | 7 |
| Integrated PHYs | 5 x 10/100/1000 BASE-T | 5 x 10/100/1000 BASE-T | 5 x 10/100/1000 BASE-T | 5 x 10/100/1000 BASE-T | 5 x 10/100/1000 BASE-T |
| Temperature Range | -40C to +85C (Industrial) | -40C to +85C | 0C to +70C (Commercial) | -40C to +85C | 0C to +70C (Eval board) |
| Switching Bandwidth | 14 Gbps | 14 Gbps | 14 Gbps | 14 Gbps | 14 Gbps |
| MAC Address Table | 16K entries | 16K entries | 16K entries | 16K entries | 16K entries |
| IEEE 1588v2 PTP | Yes (hardware timestamping) | Yes | Yes | Yes | Yes |
Bảo phân biệt quan trọng
- Seven gigabit ports in a single 128-TQFP-EP with 5 integrated PHYs (vsKSZ9477STXI)
- Industrial temperature grade as standard (vsKSZ9897RTXI)
- Integrated LinkMD TDR-based cable diagnostics (vsDP83869HMRGZR (TI single-port PHY))
Ghi chú thiết kế
The KSZ9897STXI requires three supply rails: 1.2V (core), 2.5V (analog PHY), and 3.3V (digital I/O). According to the datasheet, the device can be powered from a single 3.3V supply using the integrated LDOs, but the LDO thermal dissipation at full gigabit loading on all seven ports can exceed 1.5W. For thermally constrained designs, supply 1.2V from an external switching regulator to reduce on-chip power. Place 10 uF bulk + 0.1 uF ceramic bypass capacitors within 5 mm of each supply pin, with a ferrite bead in series to isolate the analog 2.5V rail from digital switching noise.
The 128-TQFP-EP package uses the exposed pad (EP) as the primary thermal path. Per the datasheet, theta_JA is approximately 18 C/W with a 4x4 thermal via array under the EP (0.3 mm vias, 1.2 mm pitch). Estimated: at 1.2V core current of approximately 1.5A under full wire-speed load on all 7 ports, junction-to-ambient temperature rise is about 32C above ambient (1.8W x 18 C/W). Without proper EP soldering, junction temperature can exceed the 125C maximum, triggering thermal shutdown. Always use a 4x4 minimum via array filled or capped for best thermal transfer.
Route the five integrated Gigabit PHY traces (port pairs to magnetics) as 100-ohm differential pairs with intra-pair length matching of +/- 0.15 mm and inter-pair matching of +/- 2.5 mm. Use a continuous ground reference plane under the PHY traces; never cross a plane split. The 25 MHz reference clock trace should be length-matched to within 1 mm across all clock-distribution points and routed away from the PHY differential pairs to avoid coupling. Per Microchip layout guidelines, place the magnetics within 25 mm of the RJ45 connector and within 50 mm of the PHY pins.
A common design pitfall is failing to configure the strap pins (LED outputs, PHY addresses, and management interface selection) before the rising edge of RESET_N. The KSZ9897STXI samples these strap pins only at RESET_N deassertion; any subsequent change requires a full reset. Another frequent error is using the wrong SPI mode - the KSZ9897STXI's SPI management interface requires Mode 0 (CPOL=0, CPHA=0) and a maximum clock of 25 MHz. Refer to the register map and timing diagrams in section 2 of the datasheet before bringing up the management interface.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page. The 'I' suffix denotes industrial temperature grade (-40C to +85C). The device is NOT AEC-Q100 qualified for automotive safety-critical applications; contact Microchip for AEC-Q100-qualified variants of the KSZ9897 family.
