KSZ9897STXC - 7-Port Gigabit Ethernet Switch | Microchip
MPN: KSZ9897STXC ✓ ActiveKSZ9897STXC Overview
A managed Gigabit Ethernet switch is a network-semiconductor device that connects multiple Ethernet endpoints while adding frame filtering, traffic prioritization, link diagnostics, and centralized configuration. In the product hierarchy, the KSZ9897STXC belongs to the Ethernet switch family of interface controllers, network interface ICs, and integrated circuits used to connect processors, industrial systems, and communications equipment to Ethernet networks.
Five integrated PHYs provide copper Ethernet connections, while two additional ports can be configured for SGMII or RGMII connectivity. The I2C and SPI interfaces support host or management-controller access, while EEE reduces power consumption when links are idle. Wake-on-LAN enables remote activation, QoS supports traffic prioritization, and LinkMD provides active link-status and cable-fault diagnostics. These features make the device suitable for systems requiring more than basic unmanaged Ethernet switching.
The KSZ9897 architecture integrates a layer-2 managed switching core with mixed copper and serial interface options in one package. Five copper ports support 10, 100, and 1000 Mbps operation, and the two configurable interfaces provide flexibility for processor, FPGA, or switching backplane connections. Its 128-TQFP exposed-pad package supports practical heat spreading through PCB copper, although thermal performance depends on the power dissipation, ambient temperature, and exposed-pad layout.
Typical applications include industrial Ethernet gateways, network appliances, access equipment, communications platforms, embedded systems, and factory-floor networking equipment. The managed-switch feature set is particularly useful when a product needs diagnostics, priority control, remote wake-up, or host-managed configuration rather than only transparent frame forwarding.
PCB implementation should prioritize short, controlled-trace routing for the high-speed serial interfaces, solid return paths beneath the exposed pad, and decoupling close to the power pins. Because the device contains integrated PHYs, magnetics, layout quality, thermal management, and grounding directly affect signal integrity and link reliability. Use the manufacturer's pin-description and layout guidance when assigning every signal and constructing the power and ground planes.
This product page combines the exact package, interface, management, and environmental characteristics of the KSZ9897STXC with practical application guidance, a parameter comparison, and sourcing information. It also distinguishes documented functions from specifications that require confirmation from the manufacturer datasheet, helping engineers plan a design without relying on generic Ethernet-switch assumptions.
Drop-in alternatives for KSZ9897STXC — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with KSZ9897STXC (same form factor and footprint) — differing in Package, Wake-on-LAN.
KSZ9897STXI
✅ Drop-InContact for price
View Datasheet →KSZ9897STXC Maximum Ratings & Electrical Characteristics
| Device Type | Fully integrated layer-2 managed Gigabit Ethernet switch |
| Total Port Count | 7 ports |
| Integrated Copper PHY Ports | 5 ports |
| Configurable Interface Ports | 2 ports |
| Copper Ethernet Speeds | 10/100/1000 Mbps |
| Configurable Serial Interfaces | SGMII or RGMII |
| Management Interfaces | I2C and SPI |
| Energy-Efficient Ethernet | EEE supported |
| Wake-on-LAN | Supported |
| Quality of Service | QoS supported |
| Link Diagnostics | LinkMD supported |
| Package | 128-lead TQFP exposed-pad, 14 x 14 mm |
| JEDEC Package Code | S-PQFP-G128 |
| Mounting Type | Surface mount |
| Nominal Supply Voltage | 1.2 V |
| Minimum Operating Temperature | 0 °C |
| Maximum Operating Temperature | 70 °C |
| Commercial Grade | Commercial-grade interface IC |
| TS 16949 Screening Level | Compliant with stated screening level |
KSZ9897STXC s-pqfp-g128 Pin Configuration Guide
Pin configuration for KSZ9897STXC (s-pqfp-g128 package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for KSZ9897STXC.
Refer to the datasheet for full pin configuration.
Typical Applications
KSZ9897STXC is suitable for 6 applications: Industrial Ethernet Gateway, Managed Network Appliance, Industrial Control Panel, Communications Gateway, Embedded Network Interface, Access and Surveillance Terminal.
Industrial Ethernet Gateway
The KSZ9897STXC fits industrial gateways that must combine five copper Gigabit Ethernet connections with two high-speed processor-facing ports. Its managed layer-2 features allow traffic prioritization through QoS and cable-fault monitoring through LinkMD, while I2C or SPI gives an embedded controller access to switch configuration. The 0 °C to 70 °C commercial temperature range supports indoor equipment, provided the enclosure heat rise remains within system limits. Deploy the five PHYs for devices, sensors, cameras, and service equipment, and use SGMII or RGMII to connect a communications processor when deterministic internal traffic separation is important.
Recommended
Managed Network Appliance
The KSZ9897STXC is appropriate for network appliances requiring more than basic frame forwarding. Five integrated 10/100/1000 Mbps PHYs serve external network connections, while the two configurable SGMII or RGMII ports can extend switching capacity or connect a high-throughput host. QoS supports differentiated handling of control, voice, or bulk traffic, and LinkMD assists operational diagnosis. EEE can reduce energy use during light-load periods, although firmware should coordinate sleep behavior across attached endpoints to avoid unnecessary link transitions.
Recommended
Industrial Control Panel
A control panel can use the KSZ9897STXC to connect programmable controllers, remote I/O modules, vision systems, and service interfaces over one managed switching device. The five integrated PHYs reduce the number of discrete copper interface components, while the two configurable serial ports provide flexible links to a panel controller or FPGA. LinkMD is valuable in maintenance-intensive installations because it helps identify cable and link problems, and QoS can protect control traffic from background bulk transfers. The device should be paired with an isolated management architecture and tested across the full system power and thermal envelope.
Recommended
Communications Gateway
The KSZ9897STXC works in communications equipment that bridges multiple Ethernet endpoints while retaining managed switching functions. Five copper Gigabit ports support service LANs, uplinks, and management networks, while two SGMII or RGMII interfaces can connect a network processor or FPGA at line rate. QoS helps separate latency-sensitive traffic, and Wake-on-LAN supports remote maintenance and device activation. I2C and SPI support redundant management paths where appropriate. High-speed layout must preserve controlled impedance, short return paths, and isolation between sensitive PHY and serial-interface circuitry.
Recommended
Embedded Network Interface
The KSZ9897STXC can serve as the central Ethernet interface in an embedded control system that requires several wired endpoints and deterministic layer-2 management. Five integrated PHYs connect local equipment, while the two configurable interfaces provide a route to a processor or FPGA-based datapath. This mixed architecture avoids requiring five separate Ethernet interface ICs in a compact design. The host should initialize the switch through I2C or SPI, configure QoS and EEE policies, and use LinkMD data to support field diagnostics. Firmware must also manage link-up timing, port state, and recovery after power restoration.
Recommended
Access and Surveillance Terminal
The KSZ9897STXC is suitable for access-control and surveillance equipment that combines several wired cameras or terminals with managed network behavior. Five 10/100/1000 Mbps PHYs support endpoint connections, and two configurable serial interfaces can link to a higher-level processing element. QoS can prioritize control and real-time traffic over background uploads, while LinkMD helps maintenance teams diagnose cabling. Wake-on-LAN provides remote activation, and EEE can reduce idle-port energy when correctly coordinated with connected equipment. The design must account for cable insertion, link training, surge exposure, and enclosure temperature beyond the device's nominal operating range.
Recommended
Recommended Products Summary
Engineering reference data for KSZ9897STXC — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | KSZ9897ST |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
| Package | 128-TQFP-EP (14x14) | 128-TQFP-EP (14x14) |
| Device Type | Layer-2 managed Gigabit Ethernet switch | Layer-2 managed Gigabit Ethernet switch |
| Total Port Count | 7 ports | 7 ports |
| Integrated PHY Ports | 5 ports | 5 ports |
| Copper Ethernet Speeds | 10/100/1000 Mbps | 10/100/1000 Mbps |
| Configurable Interfaces | 2 ports for SGMII or RGMII | 2 ports for SGMII or RGMII |
| Management Interfaces | I2C and SPI | I2C and SPI |
| Named Features | EEE, Wake-on-LAN, QoS, LinkMD | EEE, Wake-on-LAN, QoS, LinkMD |
Key Differentiators
- Mixed copper and serial port architecture (vs KSZ9897ST)
- Integrated managed-network functions (vs KSZ9897ST)
- Host-management connectivity (vs KSZ9897ST)
Design Notes
Implement the 128-lead TQFP exposed-pad footprint from the manufacturer package drawing and land-pattern guidance. Place input and output decoupling capacitors close to their associated supply pins, provide a continuous ground reference beneath the package, and distribute thermal-pad vias according to the recommended layout. The exposed pad is both a package feature and a primary heat-spreading path, so its electrical connection and thermal performance should be evaluated together rather than treating it as optional area.
Route SGMII and RGMII signals as controlled-impedance nets with continuous reference planes, minimal vias, and no unnecessary stubs. Keep PHY differential pairs tightly matched and separated from noisy power-conversion paths. Provide a low-impedance, uninterrupted ground system beneath high-speed lanes and follow the manufacturer’s recommended isolation spacing around clock, data, magnetics, and power circuitry.
Estimate worst-case switch and PHY dissipation using the highest configured port activity, ambient temperature, enclosure temperature rise, and exposed-pad copper area. Thermal performance can vary substantially with port utilization and board construction. Validate the final assembly at the highest expected ambient temperature and confirm that junction-temperature estimates remain below the manufacturer limit; do not infer thermal performance from package size alone.
Do not substitute the KSZ9897ST ordering variant without checking temperature grade, packing, and ordering-code details. Configure EEE, Wake-on-LAN, QoS, and LinkMD through validated firmware rather than enabling every feature by default. Also confirm reset behavior, required clock sources, power sequencing, and management-bus addresses before hardware bring-up because incorrect assumptions can produce unstable links or inaccessible ports.
Compliance Information
The product is described as commercial-grade and compliant with the stated TS 16949 screening level. Specific RoHS, REACH, lead-free, halogen-free, conflict-minerals, and AEC-Q100 declarations were not established. AEC-Q100 is not applicable unless the manufacturer separately offers an automotive-qualified version.
