KSZ8863RLLI - 3-Port 10/100 Switch w/ RMII | Microchip
MPN: KSZ8863RLLI ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.84 | $58.40 |
| 100 | $5.21 | $521.00 |
| 500 | $4.63 | $2,315.00 |
| 1,000 | $4.1 | $4,100.00 |
KSZ8863RLLI Overview
A managed Ethernet switch is a Layer 2 network device that uses a switch fabric to forward Ethernet frames between connected ports based on MAC address tables, while providing management features such as VLAN, QoS, port mirroring, and rate limiting. The KSZ8863RLLI sits in the hierarchy: Ethernet switch -> managed switch -> Layer 2 switch -> networking IC -> semiconductor. It is part of the IEEE 802.3 / 802.3u family of Fast Ethernet devices, supporting auto-negotiation per Clause 28 of the IEEE 802.3u specification.
Key features include integrated 10/100BASE-TX PHYs with HP auto-MDI/MDIX (no external magnetics on the PHY side), support for fiber mode on Port 3, an RMII interface to an external MAC or host, an I2C/SPI host management interface, advanced power management including energy-detect mode, and 1.4 KB packet buffer per port. The device operates from -40C to +85C industrial temperature range.
Architecture is built on a store-and-forward switch fabric with 1 Gbps total bandwidth, supporting wire-speed non-blocking forwarding on all three ports. The device includes IEEE 802.1Q VLAN, 802.1p QoS priority queues, port-based access control, and IGMP snooping for multicast filtering. The 48-pin LQFP package allows simple 4-layer PCB assembly using standard lead-free reflow.
Typical applications include industrial Ethernet sensor networks, IP surveillance cameras with daisy-chained switch ports, building automation backbones, factory automation PLCs, and embedded IoT gateways requiring multiple Ethernet ports. The integrated PHYs and small package reduce BOM cost and PCB area versus discrete MAC+PHY solutions.
When designing with this device, designers should follow the KSZ8863RLL Hardware Design Checklist from Microchip for crystal and magnetics selection. The 25 MHz reference clock drives the internal PHYs; PHY-to-MAC connection should use impedance-controlled traces per IEEE 802.3 100BASE-TX.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for KSZ8863RLLI — 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 KSZ8863RLLI (same form factor and footprint) — differing in External MAC Interface, Number of Ports, Reference Clock.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
KSZ8863MLLI
✅ Drop-In📋 Reference alternative (not in catalog)
KSZ8863FLLI
✅ Drop-In📋 Reference alternative (not in catalog)
KSZ8873FLLI
✅ Drop-In📋 Reference alternative (not in catalog)
KSZ8863RLLI Maximum Ratings & Electrical Characteristics
| Product Type | 3-Port 10/100 Managed Ethernet Switch with PHYs |
| Data Rate | 10/100 Mbps per port |
| Number of Ports | 3 |
| PHY Interfaces | 3x integrated 10/100BASE-TX PHYs |
| Host CPU Interface | I2C / SPI (non-PCI) |
| External MAC Interface | 1x RMII |
| Fiber Support | Port 3 supports 100BASE-FX |
| Switch Bandwidth | 1 Gbps non-blocking |
| Auto-Negotiation | IEEE 802.3u Clause 28 |
| Auto-MDI/MDIX | Yes, HP auto-crossover on all ports |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 48-LQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Reference Clock | 25 MHz external crystal |
KSZ8863RLLI Pin Configuration
| Pin 1 | VDD_33 — 3.3V digital supply |
| Pin 2 | GND — Ground |
| Pin 3 | X1 — 25 MHz crystal input |
| Pin 4 | X2 — 25 MHz crystal output |
| Pin 5 | RST_N — Hardware reset (active low) |
| Pin 6 | SCL — I2C clock / SPI clock |
| Pin 7 | SDA — I2C data / SPI data |
| Pin 8 | SPISL — SPI/I2C mode select strap |
| Pin 9 | INT_N — Interrupt output (active low) |
| Pin 10 | LED1_1 — Port 1 LED indicator |
| Pin 11 | LED1_2 — Port 1 LED indicator |
| Pin 12 | LED2_1 — Port 2 LED indicator |
| Pin 13 | LED2_2 — Port 2 LED indicator |
| Pin 14 | LED3_1 — Port 3 LED indicator |
| Pin 15 | LED3_2 — Port 3 LED indicator |
| Pin 16 | RMII_REF_CLK — RMII reference clock input |
| Pin 17 | RMII_CRS_DV — RMII carrier sense / data valid |
| Pin 18 | RMII_RXD0 — RMII receive data 0 |
| Pin 19 | RMII_RXD1 — RMII receive data 1 |
| Pin 20 | RMII_TXEN — RMII transmit enable |
| Pin 21 | RMII_TXD0 — RMII transmit data 0 |
| Pin 22 | RMII_TXD1 — RMII transmit data 1 |
| Pin 23 | RMII_MDC — RMII management clock |
| Pin 24 | RMII_MDIO — RMII management data |
| Pin 25 | VDD_33A — 3.3V analog supply |
| Pin 26 | GNDA — Analog ground |
| Pin 27 | P1_RXP — Port 1 PHY receive positive |
| Pin 28 | P1_RXN — Port 1 PHY receive negative |
| Pin 29 | P1_TXP — Port 1 PHY transmit positive |
| Pin 30 | P1_TXN — Port 1 PHY transmit negative |
| Pin 31 | P2_RXP — Port 2 PHY receive positive |
| Pin 32 | P2_RXN — Port 2 PHY receive negative |
| Pin 33 | P2_TXP — Port 2 PHY transmit positive |
| Pin 34 | P2_TXN — Port 2 PHY transmit negative |
| Pin 35 | P3_RXP — Port 3 PHY receive positive (copper) |
| Pin 36 | P3_RXN — Port 3 PHY receive negative (copper) |
| Pin 37 | P3_TXP — Port 3 PHY transmit positive (copper) |
| Pin 38 | P3_TXN — Port 3 PHY transmit negative (copper) |
| Pin 39 | FX_SD — Port 3 fiber signal detect |
| Pin 40 | FX_RXP — Port 3 fiber receive positive |
| Pin 41 | FX_RXN — Port 3 fiber receive negative |
| Pin 42 | FX_TXP — Port 3 fiber transmit positive |
| Pin 43 | FX_TXN — Port 3 fiber transmit negative |
| Pin 44 | GPIO0 — General purpose IO / strap config |
| Pin 45 | GPIO1 — General purpose IO / strap config |
| Pin 46 | GPIO2 — General purpose IO / strap config |
| Pin 47 | VDD_33 — 3.3V digital supply |
| Pin 48 | GND — Ground |
Typical Applications
KSZ8863RLLI is suitable for 6 applications: Industrial Ethernet Sensor Networks, IP Surveillance Camera Daisy-Chain, Building Automation Backbone, Factory Automation PLC, Embedded IoT Gateway, Multi-Port Network Printer / MFP.
Industrial Ethernet Sensor Networks
The KSZ8863RLLI's three integrated 10/100BASE-TX PHYs and 48-LQFP industrial temperature rating make it well-suited to multi-port industrial sensor backbones. With 1 Gbps non-blocking switch fabric and IEEE 802.1Q VLAN support, the device isolates sensor traffic while supporting QoS prioritization for time-critical control messages. The -40C to +85C operation and HP auto-MDI/MDIX remove the need for crossover cables in field installations. Engineers typically place it on a sensor hub or PLC backplane with isolated magnetics on each RJ45, drawing power from a 3.3V rail. Compared with discrete MAC+PHY designs, the integrated approach cuts BOM count by 2-3 ICs.
Recommended
IP Surveillance Camera Daisy-Chain
IP cameras with PoE and daisy-chained switch ports benefit from the KSZ8863RLLI's three-port managed switch with I2C/SPI host management. The on-chip PHYs connect one port to the network uplink, one to the local camera SoC's MAC, and one to a downstream daisy-chained camera - all without external magnetics on the PHY side. The integrated switch provides 802.1p QoS to prioritize video traffic over management frames. Power consumption is low enough for PoE Class 2/3 budgets. The 48-LQFP package fits a small camera PCB, and industrial temperature rating supports outdoor IP66 enclosures.
Recommended
Building Automation Backbone
Building automation controllers requiring multiple Ethernet ports for HVAC, lighting, and access control subsystems use the KSZ8863RLLI as a compact managed switch fabric. The I2C/SPI host interface allows a low-cost microcontroller to manage VLAN segmentation per subsystem, isolating building management traffic. Port 3 fiber support (100BASE-FX) lets the device bridge to long-distance building backbone cabling up to 2 km. The industrial temperature grade and Microchip long-term supply support makes the device suitable for 10-15 year building lifecycle deployments per typical building automation product lifetimes.
Recommended
Factory Automation PLC
Programmable Logic Controllers and industrial gateways use the KSZ8863RLLI to provide daisy-chainable Ethernet ports for EtherNet/IP, PROFINET, or Modbus TCP fieldbus traffic. The device's store-and-forward architecture with 1 Gbps fabric bandwidth delivers deterministic latency for real-time control loops. IEEE 802.1Q VLAN tagging allows logical separation of control and monitoring traffic on the same physical port. The -40C to +85C industrial rating and Microchip long-term product support fit the 10+ year lifecycle typical of industrial PLC deployments in factory automation.
Recommended
Embedded IoT Gateway
Embedded IoT gateways consolidating multiple Ethernet devices (sensors, edge controllers, wireless APs) into a single managed switch use the KSZ8863RLLI for its small footprint, low power, and integrated PHYs. The 48-LQFP 7x7 mm package allows the device to fit on compact gateway PCBs alongside WiFi/BLE modules. The I2C management interface lets a Linux SoC configure VLANs, port mirroring, and QoS for traffic shaping between WAN and LAN segments. The integrated HP auto-MDI/MDIX eliminates cable-type errors in field installations by installers who may use straight-through cables on all ports.
Recommended
Multi-Port Network Printer / MFP
Multi-function printers and network print servers that expose multiple Ethernet segments (internal, guest, secure) use the KSZ8863RLLI as a 3-port Layer 2 managed switch. The on-chip PHYs reduce PCB area versus a 3-chip MAC+PHY+switch solution. The I2C/SPI host interface allows the printer's main MCU to configure port-based access control, blocking guest traffic from secure internal networks. Low power consumption helps the device fit within ENERGY STAR printer power budgets. The industrial temperature grade supports commercial printer environments with elevated operating temperatures in enclosed printer chassis.
Recommended
Recommended Products Summary
Engineering reference data for KSZ8863RLLI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | KSZ8863MLLI | KSZ8863FLLI | KSZ8873FLLI |
|---|---|---|---|---|
| Package | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Number of Ports | 3 | 3 | 3 | 3 |
| Data Rate | 10/100 Mbps | 10/100 Mbps | 10/100 Mbps | 10/100 Mbps |
| External MAC Interface | 1x RMII | 1x MII | 1x MII | 1x MII |
| Fiber Support | Port 3 only (100BASE-FX) | Port 3 only (100BASE-FX) | Port 3 only (100BASE-FX) | All 3 ports (100BASE-FX) |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| RoHS Compliance | Yes | Yes | Yes | Yes |
Key Differentiators
- Pin-compatible same-family alternative with MII instead of RMII (vs KSZ8863MLLI)
- Lower-cost same-family option if MII host is acceptable (vs KSZ8863FLLI)
- 3-port fiber on Port 3 only vs all 3 ports fiber (vs KSZ8873FLLI)
Design Notes
Place the 25 MHz crystal within 5 mm of the X1/X2 pins, with a ground guard ring around the crystal traces to minimize reference-clock jitter. The KSZ8863RLL Hardware Design Checklist from Microchip specifies that the X1 pin capacitor (pin 10) is system-dependent and must be tuned for the crystal CL and PCB stray capacitance. Use a crystal with ESR less than 50 ohm and 20 pF load capacitance for stable 25 MHz operation across the industrial -40C to +85C range.
Route the 100BASE-TX differential pairs (P1_TXP/N, P1_RXP/N, etc.) as 100 ohm differential impedances with matched length to within 2 mm. Keep the analog supply (VDD_33A) and digital supply (VDD_33) separated with ferrite beads to prevent switching noise from coupling into the PHY analog sections. The Port 3 fiber pins (FX_RXP/N, FX_TXP/N) should be guarded by a continuous ground plane to prevent crosstalk with the copper Port 3 differential pairs.
Do not leave the RMII_REF_CLK pin floating - it requires a 50 MHz reference clock from the host MAC or external oscillator. The HP auto-MDI/MDIX function eliminates the need for crossover cables, but if you wire Port 3 in fiber mode, you must strap the appropriate GPIO to disable the copper PHY on that port. The I2C/SPI mode select strap (SPISL) must be pulled up or down at reset to select the correct management interface - leaving it floating causes unpredictable behavior per the Microchip datasheet strap configuration table.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C. AEC-Q100 not applicable (industrial/consumer, not automotive qualified).
