KSZ8863RLL - 3-Port 10/100 Ethernet Switch | Microchip
MPN: KSZ8863RLL ✓ ActiveKSZ8863RLL Overview
An Ethernet switch is a network-interface semiconductor that receives Ethernet frames on one port and forwards them to another port using address-based learning. The 10/100 designation refers to support for 10 Mbps and 100 Mbps Ethernet rates, while the three-port architecture consolidates multiple physical-layer connections into one device. In the system hierarchy, the KSZ8863RLL is an Ethernet interface IC, a network interface controller, and ultimately a communications semiconductor.
The verified product information identifies the KSZ8863 family as a managed Ethernet switch with integrated 10/100 PHYs, I2C and SPI configuration interfaces, and fiber support. These capabilities allow a compact product to combine several network ports without requiring a separate switch controller and individual PHY devices. Its three-port organization is useful in industrial, embedded, communications, and edge-network equipment where a small number of Ethernet links must be managed efficiently.
The KSZ8863RLL uses a 48-LQFP package measuring 7x7 mm according to the distributor listing. Package-level power, temperature, clock, and Ethernet-magnetics requirements must be confirmed in the manufacturer datasheet and KSZ8863RLL Hardware Design Checklist. Those documents are especially relevant to differential trace routing, magnetic-component placement, supply decoupling, and the reference-clock circuit.
Typical deployments include three-port industrial Ethernet controllers, embedded network gateways, compact PLC communication modules, factory-floor connectivity, and OEM equipment requiring copper plus optional fiber links. The managed-switch architecture also makes the device suitable for systems that need more controlled network segmentation than an unmanaged repeater provides.
For PCB implementation, preserve the pin assignments and reference-clock layout recommended by Microchip. The hardware checklist identifies pin 10 as the clock-circuit output and requires a capacitor to ground, while crystal, stray-capacitance, and load-capacitance values must be selected together. Ethernet magnetics, controlled-impedance routing, grounding, and isolation also require careful validation in the final board design.
This page consolidates verified product identity, package information, pricing data, family substitutions, and practical hardware-design guidance. It also distinguishes documented KSZ8863 variants from unsupported replacement claims, helping engineers evaluate compatibility without treating every similar Ethernet switch as a true pin-to-pin substitute.
Drop-in alternatives for KSZ8863RLL — 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 KSZ8863RLL (same form factor and footprint) — differing in Package, Number of Ports, QoS, VLAN Support, Product Type.
KSZ8863MLL
✅ Drop-InContact for price
View Datasheet →KSZ8863FLL
✅ Drop-InContact for price
View Datasheet →KSZ8863RLLI
✅ Drop-InContact for price
View Datasheet →KSZ8863RLL Maximum Ratings & Electrical Characteristics
| Device Type | Managed Ethernet switch with integrated PHYs |
| Number of Ports | 3 ports |
| Ethernet Data Rate | 10/100 Mbps |
| Copper Ethernet Support | 10/100BASE-T |
| Fiber Support | Supported |
| Configuration Interface | I2C and SPI |
| Package | 48-LQFP (7x7 mm) |
| Mounting Type | Surface mount |
| Clock-Circuit Output Pin | Pin 10 |
| QoS Features | Advanced power management and sophisticated QoS features described by manufacturer |
| Power Consumption | Power-efficient architecture described by manufacturer; numerical value not provided |
KSZ8863RLL 48-lqfp (7x7 mm) Pin Configuration Guide
Pin configuration for KSZ8863RLL (48-lqfp (7x7 mm) 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 KSZ8863RLL.
Refer to the datasheet for full pin configuration.
Typical Applications
KSZ8863RLL is suitable for 6 applications: Industrial Ethernet Gateway, Embedded Network Controller, Factory Automation Communication Module, Compact PLC Network Interface, Fiber-Capable Network Bridge, OEM Control and Monitoring Equipment.
Industrial Ethernet Gateway
The KSZ8863RLL fits a compact industrial Ethernet gateway that needs three managed 10/100 Mbps links in one 48-LQFP 7x7 mm package. Its integrated PHYs reduce the number of separate Ethernet interface components, while I2C or SPI configuration allows a host controller to initialize the switch without using parallel registers. The manufacturer describes the family as power-efficient and suitable for low-port-count systems, making it appropriate for gateways that connect sensors, controllers, and service networks. The final design must follow Microchip’s hardware checklist for power, clocking, Ethernet signals, and termination rather than treating the IC as a standalone plug-in network port.
Recommended
Embedded Network Controller
The KSZ8863RLL is appropriate for an embedded network controller requiring three integrated 10/100 Ethernet ports without a separate switch PHY for every link. Its managed-switch architecture provides a compact way to connect a local processor to service, uplink, and expansion ports. Configuration through I2C or SPI suits embedded designs where pin count and host-bus efficiency are important. Because the verified information does not specify detailed port roles or maximum frame handling, designers should review the complete manufacturer documentation before assigning operations. PCB implementation must also preserve the recommended Ethernet trace geometry and reference-clock arrangement.
Recommended
Factory Automation Communication Module
A factory automation communication module can use the KSZ8863RLL to consolidate three 10/100 Mbps Ethernet connections into a managed, low-port-count switch. The integrated PHYs support compact control-panel and edge-device designs, while the family’s advanced power-management and QoS features can help managed network behavior in equipment that connects field devices to a controller or supervisory network. The 7x7 mm 48-LQFP footprint saves board area compared with a discrete controller-and-PHY architecture. Product qualification still requires confirmation of temperature range, EMC behavior, isolation, and magnetic-component selection, none of which can be inferred solely from the distributor summaries.
Recommended
Compact PLC Network Interface
The KSZ8863RLL is a practical candidate for compact PLC or remote-I/O communication modules requiring three managed Fast Ethernet links. A three-port arrangement can support two device-facing ports and one uplink without requiring a larger Ethernet switch. Microchip identifies the KSZ8863 family as power-efficient and highly integrated, supporting space-constrained industrial equipment. I2C and SPI host configuration can simplify integration with an embedded controller, while fiber support may extend connectivity beyond copper cabling. Before design release, engineers should confirm electrical limits, operating temperature, fiber-option requirements, and clock accuracy against the full manufacturer documentation.
Recommended
Fiber-Capable Network Bridge
The KSZ8863RLL supports copper and fiber-oriented deployments through the KSZ8863 family’s documented fiber support, making it suitable for bridging a compact equipment endpoint to a fiber uplink. Its three integrated 10/100 PHYs allow multiple copper connections alongside the optical path when the selected variant and configuration support the required combination. The single 48-LQFP device can simplify synchronization of addressing and port management compared with separate switch and PHY components. Designers must validate the exact fiber interface requirements, external magnetics or transceiver arrangement, loss budget, and isolation strategy; the verified snippets do not provide those numerical implementation limits.
Recommended
OEM Control and Monitoring Equipment
The KSZ8863RLL can serve three managed Fast Ethernet connections in OEM control and monitoring equipment that combines local service, diagnostic, and plant-network ports. Its integrated three-port architecture reduces component count and board area, while managed switching, power-management features, and QoS support fit equipment expected to segment traffic between subsystems. I2C or SPI configuration allows the main controller to configure the network device during startup. Implementation should follow the KSZ8863RLL Hardware Design Checklist, especially for the pin 10 clock circuit, crystal load capacitance, Ethernet magnetic components, and controlled-impedance routing.
Recommended
Recommended Products Summary
Engineering reference data for KSZ8863RLL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | KSZ8863MLL | KSZ8863FLL | KSZ8863RLLI |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) |
| Device Type | Managed three-port Ethernet switch with integrated PHYs | KSZ8863-family managed Ethernet switch | KSZ8863-family managed Ethernet switch | Closely related KSZ8863 three-port switch variant |
| Ethernet Data Rate | 10/100 Mbps | 10/100 Mbps | 10/100 Mbps | 10/100 Mbps |
| Number of Ports | 3 ports | 3 ports | 3 ports | 3 ports |
| Substitution Status | Reference RLL device | Listed by Microchip in the RLL/MLL/FLL substitution guidance | Listed by Microchip in the RLL/MLL/FLL substitution guidance | Identified as a closely related ordering variant by cross-reference data |
Key Differentiators
- Exact RLL ordering identity supported by multiple live distributor listings (vs KSZ8863MLL)
- Verified single-unit market price (vs KSZ8863FLL)
- Three-port managed switching in one 48-LQFP device (vs KSZ8863RLLI)
Design Notes
Follow the manufacturer KSZ8863RLL Hardware Design Checklist for Ethernet routing, power, digital interfaces, and termination. The checklist specifically identifies pin 10 as the clock-circuit output and states that it requires a capacitor to ground. Select the crystal and load capacitor together using the crystal load-capacitance specification and total stray capacitance; PCB pad capacitance and nearby high-impedance routing materially affect oscillator startup and clock accuracy.
Place Ethernet magnetic components and the associated differential traces in the locations recommended by Microchip, with symmetry maintained between each differential pair. Avoid adding test pads, copper pours, or unrelated routing beneath sensitive Ethernet and clock nodes unless the layout guide permits them. Treat Ethernet routing as a controlled-impedance interface and validate differential impedance, via symmetry, return paths, and isolation boundaries with the final stack-up and magnetics before production.
Do not assume that every KSZ8863 suffix is automatically interchangeable merely because the devices share the family name. Microchip publishes a dedicated RLL, MLL, and FLL substitution article, so compare supported PHY, fiber, clock, management, and ordering details before replacing the RLL. Also do not derive a complete pinout from search snippets; use the manufacturer datasheet and hardware checklist because the verified excerpt confirms only the clock-circuit output on pin 10.
Compliance Information
The verified snippets identify the KSZ8863RLL as a Microchip Technology Ethernet switch but do not provide extractable RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. No compliance status has been assumed.