KSZ9897RTXI-TR - 7-Port Gigabit Managed Ethernet Switch | Microchip
MPN: KSZ9897RTXI-TR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $15.7 | $15.70 |
| 10 | $14.2 | $142.00 |
| 100 | $12.1 | $1,210.00 |
| 500 | $10.5 | $5,250.00 |
| 1,000 | $9.2 | $9,200.00 |
KSZ9897RTXI-TR Overview
A managed Layer-2 Ethernet switch is an IC that performs wire-speed forwarding of Ethernet frames between multiple physical ports while supporting VLAN tagging, QoS prioritization, IGMP snooping, port-based access control, and management via software. Switch ICs sit hierarchically between physical layer (PHY) transceivers and the network processor/host CPU, falling under the broader category of networking ICs within wired connectivity.
Key features of the KSZ9897RTXI-TR include IEEE 802.1Q VLAN support, 802.1p QoS with four priority queues per port, IPv4/IPv6 multicast IGMP/MLD snooping, port mirroring, ACL filtering, EEE (Energy Efficient Ethernet) per 802.3az, and integrated 1.5 kV Ethernet transformer isolation on the cable-side ports. The device uses strap pins for default configuration and supports EEPROM-less unmanaged mode.
Architecturally, the KSZ9897RTXI uses a store-and-forward shared-bus fabric with an integrated Address Resolution Logic (ARL) table. The on-chip PHYs employ DSP-based echo and near-end crosstalk cancellation, supporting Cat-5 UTP cable runs up to 100 m. The two non-PHY ports can be configured as RGMII/MII/RMII for direct MAC-to-MAC connection to a processor, or as SGMII to interface with an external 1000BASE-T PHY or SFP cage.
Typical applications include industrial IoT gateways, industrial Ethernet switches, IP cameras and surveillance backhaul, building automation, smart-grid RTUs, automotive Ethernet AVB bridges, telecom routers, and embedded routers requiring 5 or more managed Gigabit links on a single board. The 7-port count fits compact managed switches used in industrial control cabinets.
Design consideration: plan PCB layout to keep the MII/RGMII/SGMII traces length-matched within 50 mil of the host SoC and provide solid ground stitching vias between port pairs to minimize crosstalk. The integrated PHYs require a 25 MHz reference crystal with 50 ppm accuracy for stable 1000BASE-T operation.
This page synthesizes distributor pricing from DigiKey, Mouser, and LCSC, lists true same-package drop-in alternatives (KSZ9897RTXI, KSZ9477STXI), and provides practical thermal and PCB layout notes not found in the manufacturer datasheet alone.
Drop-in alternatives for KSZ9897RTXI-TR — 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 KSZ9897RTXI-TR (same form factor and footprint) — differing in Number of Ports, Package, Product Type, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
KSZ9897RTXI
✅ Drop-In📋 Reference alternative (not in catalog)
KSZ9477STXI
✅ Drop-In📋 Reference alternative (not in catalog)
KSZ9897RTXI-TR
✅ Drop-In✓ In Stock
$9.2 / Unit
View Datasheet →KSZ9897RTXI-TR Maximum Ratings & Electrical Characteristics
| Product Type | Layer-2 Managed Gigabit Ethernet Switch |
| Number of Ports | 7 (5 integrated PHY + 2 configurable host/MAC ports) |
| PHY Speed Support | 10/100/1000 Mbps |
| Integrated PHYs | 5 x 10/100/1000BASE-T |
| Configurable Interfaces | SGMII, RGMII, MII, RMII |
| Host Management Interface | I2C, SPI |
| Switching Capacity | Non-blocking wire-speed |
| VLAN Support | IEEE 802.1Q |
| QoS | IEEE 802.1p, 4 priority queues per port |
| Multicast Support | IGMP snooping, MLD snooping |
| Energy Efficient Ethernet | IEEE 802.3az |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 128-TQFP-EP (14x14 mm) with exposed pad |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
| RoHS Status | Compliant |
| Lead-Free | Yes |
KSZ9897RTXI-TR 128-tqfp-ep (14x14 mm) with exposed pad Pin Configuration Guide
Pin configuration for KSZ9897RTXI-TR (128-tqfp-ep (14x14 mm) with exposed pad 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 KSZ9897RTXI-TR.
Refer to the datasheet for full pin configuration.
Typical Applications
KSZ9897RTXI-TR is suitable for 7 applications: Industrial Ethernet Switch / IoT Gateway, IP Surveillance / Network Video Recorder (NVR) Backbone, Building Automation & Smart-Lighting Controller, Telecom Router / Edge Routing Platform, Embedded Industrial PC / SBC Network Interface, Industrial IoT Edge Gateway with TSN Support, Automotive Ethernet AVB Bridge (Cabinet-Grade).
Industrial Ethernet Switch / IoT Gateway
The KSZ9897RTXI-TR's seven managed gigabit ports and -40C to +85C industrial temperature rating make it ideal for compact industrial Ethernet switches and IoT gateways that must aggregate multiple sensor networks. Its integrated 10/100/1000 PHYs eliminate external PHY ICs on five ports, while the two RGMII/MII/RMII host ports connect directly to a host SoC running VPN, MQTT, or OPC-UA protocol stacks. IEEE 802.1Q VLAN and 802.1p QoS with four priority queues per port allow traffic prioritization for time-critical control loops. The part supports wire-speed forwarding across all seven ports, which is critical when aggregating gigabit vision systems, motion controllers, and PROFINET or EtherNet/IP traffic on the factory floor.
Recommended
IP Surveillance / Network Video Recorder (NVR) Backbone
The KSZ9897RTXI-TR serves as the switching backbone in IP camera and NVR systems, providing wire-speed gigabit forwarding across five PHY ports (each capable of carrying 4K IP camera streams) and two uplink ports to an NVR host SoC. Its IGMP/MLD snooping offloads multicast group management from the host CPU, reducing software overhead when dozens of cameras broadcast RTSP streams simultaneously. Port-based VLAN and ACL features let integrators isolate camera VLANs from management VLANs for security hardening. The integrated 802.3az Energy Efficient Ethernet (EEE) drops PHY power consumption during idle video periods, valuable in 24/7 surveillance deployments.
Recommended
Building Automation & Smart-Lighting Controller
In building automation, the KSZ9897RTXI-TR aggregates multiple fieldbus segments (DALI-2 lighting, BACnet, KNX, Modbus TCP) into a single managed Ethernet backbone. Five integrated Gigabit PHYs connect directly to room controllers, touch panels, and HVAC gateways without external PHY ICs, reducing BOM cost in ceiling-mountable control cabinets. The two RGMII/MII/RMII host ports allow a host CPU running Niagara, Niagara 4, or openHAB to manage all VLANs centrally. Hardware QoS with four priority queues ensures that fire-alarm and life-safety traffic preempt HVAC and lighting traffic, satisfying building-code requirements for emergency traffic priority.
Recommended
Telecom Router / Edge Routing Platform
The KSZ9897RTXI-TR is suited for small-to-medium telecom edge routers and SD-WAN appliances requiring line-rate layer-2 switching across multiple WAN/LAN ports. Its hardware ACL and QoS features let operators enforce per-subscriber policies at line rate, and the two SGMII-capable host interfaces connect to an NPXC network processor SoC for routing, NAT, and IPSec offload. The industrial temperature range ensures reliable operation in outdoor enclosures (IT cabinets) and uncontrolled-temperature telecom closets. Port mirroring aids in network telemetry and lawful intercept, while hardware IGMP/MLD snooping enables efficient IPTV multicast distribution to residential subscribers.
Recommended
Embedded Industrial PC / SBC Network Interface
Single-board computers and industrial PCs based on Microchip SAMA5, NXP i.MX8, or TI Sitara SoCs use the KSZ9897RTXI-TR to provide five additional Gigabit Ethernet ports alongside the SoC's integrated MAC. The two RGMII host ports can be wired directly to the SoC's Ethernet MAC, while the five integrated PHYs connect to industrial sensors, cameras, and downstream switches. Hardware time-stamping and PTP support enable deterministic Ethernet for synchronized motion control. The exposed pad on the TQFP-EP package provides thermal dissipation for fanless industrial PCs that run at elevated ambient temperatures.
Recommended
Industrial IoT Edge Gateway with TSN Support
The KSZ9897RTXI-TR functions as the managed switching fabric in industrial IoT edge gateways that bridge OT (Operational Technology) networks to IT (Information Technology) cloud platforms. With five integrated PHYs and two host interfaces, the gateway can simultaneously connect to PLCs, sensors, vision systems, and an upstream cloud-connectivity module. Hardware ACLs enforce firewall policies between OT and IT domains at line rate without CPU intervention. The 128-TQFP-EP package with exposed pad supports the high ambient temperatures inside sealed control enclosures, and the part's RoHS-compliant lead-free construction satisfies modern industrial sustainability requirements.
Recommended
Automotive Ethernet AVB Bridge (Cabinet-Grade)
Although not AEC-Q100 qualified, the KSZ9897RTXI-TR's industrial -40C to +85C temperature range suits non-cabin automotive and commercial-vehicle Ethernet Audio/Video Bridging (AVB) applications such as in-cab infotainment backbones, fleet telematics gateways, and commercial-vehicle camera systems. The two RGMII/MII/RMII host ports can carry AVB streams to/from an automotive SoC, while the five integrated Gigabit PHYs aggregate camera, radar, and LiDAR sensor streams. Hardware VLAN and QoS prioritization guarantee that safety-critical sensor traffic preempt entertainment traffic, supporting IEEE 802.1Qav and IEEE 802.1AS timing requirements when paired with an external PTP grandmaster.
Recommended
Recommended Products Summary
Engineering reference data for KSZ9897RTXI-TR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | KSZ9897RTXI | KSZ9477STXI |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 128-TQFP-EP (14x14 mm) | 128-TQFP-EP (14x14 mm) - same | 128-TQFP-EP - same footprint |
| Number of Ports | 7 (5 PHY + 2 host) | 7 (5 PHY + 2 host) | 7 (with SGMII host ports) |
| PHY Speed | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps |
| Host Interface Options | SGMII/RGMII/MII/RMII | SGMII/RGMII/MII/RMII | SGMII/RGMII/MII/RMII |
| VLAN Support | IEEE 802.1Q | IEEE 802.1Q | IEEE 802.1Q |
| QoS | 802.1p, 4 priority queues | 802.1p, 4 priority queues | 802.1p, 4 priority queues |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C |
| Packaging | Tape & Reel | Tray | Tray (-T suffix denotes tape) |
Key Differentiators
- Five integrated Gigabit PHYs with no external PHY ICs required (vs KSZ8995MAI)
- Industrial temperature range with full gigabit switching fabric (vs KSZ8863RLLI-TR)
- Layer-2 managed features with hardware ACL and QoS (vs KSZ8999I)
- Dual SGMII/RGMII/MII/RMII host interface flexibility (vs KSZ8895MQXI)
Design Notes
The KSZ9897RTXI-TR's TQFP-EP package includes an exposed thermal pad that MUST be soldered to a ground plane with multiple thermal vias for heat dissipation. In a fully loaded 7-port gigabit design with all five PHYs active and traffic on all ports, the IC typically dissipates approximately 2-3 W. Without proper EP soldering, junction temperature can exceed 100C in sealed industrial enclosures. Recommended layout: at least 16 thermal vias in a 4x4 array under the EP, each 0.3 mm diameter, connecting to inner ground planes. Maintain a minimum 1 oz copper pour on top and bottom layers under the IC body.
Differential pair routing for the five integrated PHY ports and the two host interfaces must follow 100-ohm differential impedance with intra-pair skew under 50 mils (1.27 mm) for 1000BASE-T. Per Microchip reference design guidance, route PHY traces on the top layer over a continuous ground plane with no splits, keep traces away from switching power supply nodes, and maintain at least 3W spacing between adjacent port pairs to minimize crosstalk. The 25 MHz reference crystal must be placed within 5 mm of the XI/XO pins with a guard ring grounded to the analog ground plane.
Common pitfalls with the KSZ9897RTXI-TR include: (1) omitting the external 1.2V or 2.5V regulator for the analog PHY supply - the part needs multiple supply rails and a misconfigured power tree causes link-up failures; (2) incorrect strap pin pull-up/pull-down resistors on configuration pins - strap pin states are sampled only at reset and determine default managed vs unmanaged mode; (4) forgetting to add the I2C/SPI EEPROM for unmanaged mode default configuration - without it, the switch defaults to a generic configuration that may not match the design's VLAN/QoS policy; (5) using incompatible magnetics with improper common-mode choke rating - IEEE 802.3 spec compliance fails with wrong magnetics.
For the SGMII host interface option, route SGMII differential pairs (SGMII_TX_P/N, SGMII_RX_P/N) with 100-ohm differential impedance and a maximum trace length of 50 mm to minimize jitter. Per IEEE 802.3 clause 36, SGMII AC-coupling capacitors (0.1uF) are required on both transmit and receive pairs near the KSZ9897RTXI-TR pins. The RGMII interface uses single-ended 1.8V or 2.5V CMOS signals - trace length matching between clock and data/strobe pairs must be within 50 mils (1.27 mm) to avoid timing violations at 125 MHz DDR operation.
The KSZ9897RTXI-TR typically requires 1.0V (digital core), 1.8V or 2.5V (analog PHY), and 3.3V (IO) supply rails. Per Microchip reference schematic, a 4-layer PCB with dedicated power planes is recommended. Place 10uF bulk capacitors near each supply pin, plus 1uF and 0.1uF ceramic capacitors within 3 mm of each pin. Estimated: with all ports active at gigabit speeds, total IC power consumption is approximately 2.5-3.0 W; the host SoC's RGMII/MII/SGMII interface consumes negligible additional current.
Compliance Information
RoHS compliant and lead-free per Microchip product page; not AEC-Q100 qualified (industrial temperature range -40C to +85C). Halogen-free status and full REACH compliance details not explicitly stated in the verified data and marked unknown.
