KSZ9031MNXIC - Automotive Gigabit Ethernet PHY | Microchip
MPN: KSZ9031MNXIC ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.5535 | $4.55 |
| 10 | $4.5535 | $45.54 |
| 100 | $4.5535 | $455.35 |
| 500 | $4.5535 | $2,276.75 |
| 1,000 | $4.5535 | $4,553.50 |
KSZ9031MNXIC Overview
An Ethernet physical-layer transceiver, or Ethernet PHY, converts digital data from a network controller into electrical signals suitable for twisted-pair cabling and converts received signals back into digital data. The KSZ9031 belongs to the PHY layer within the Ethernet communication hierarchy, supporting copper Ethernet links in automotive, industrial, and embedded network equipment. Its triple-speed operation allows one physical-layer device to interoperate with 10, 100, and 1000 Mb/s network controllers.
The verified source data identifies the KSZ9031 family as automotive qualified and highlights LinkMD cable diagnostics, power-saving features, and GMII/MII support. LinkMD diagnostics help a system identify cable faults such as opens, shorts, and incorrect wiring, reducing commissioning and maintenance time. GMII and MII compatibility gives designers flexibility when connecting the PHY to microcontrollers, network controllers, FPGAs, or other digital controllers.
The device is packaged in a 64-QFN, 8 mm by 8 mm surface-mount format. Its exposed thermal construction and lead-free package support compact PCB designs, although final thermal performance depends on the PCB copper area, airflow, and the exact operating current established by the selected operating mode.
Typical applications include automotive Ethernet gateways, vehicle infotainment systems, industrial Ethernet controllers, network switches, embedded servers, and equipment requiring copper Gigabit Ethernet connectivity. The KSZ9031MNXIC is appropriate when a design needs one PHY to cover legacy 10 Mb/s links as well as 100 Mb/s and Gigabit networks.
For new layouts, engineers should follow the manufacturer reference schematic and pin definitions, preserve high-speed differential routing geometry, provide the required decoupling, and validate magnetics, cable, and connector compatibility. Existing boards should also verify controller voltage levels and interface timing before replacing another PHY.
This page combines verified distributor and manufacturer information with application guidance, pinout documentation, and engineering considerations that help teams evaluate the KSZ9031MNXIC for new designs or replacement programs.
Drop-in alternatives for KSZ9031MNXIC — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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KSZ9031MNXIA
✅ Drop-In📋 Reference alternative (not in catalog)
KSZ9031MNXIC Specifications
| Ethernet Speeds | 10 Mb/s, 100 Mb/s, and 1000 Mb/s |
| Supported Standards | 10Base-T, 100Base-TX, and 1000Base-T |
| Cable Type | CAT-5 unshielded twisted-pair cable |
| Product Type | Triple-speed Ethernet physical-layer transceiver |
| Digital Interface | GMII/MII |
| Automotive Qualification | Automotive qualified |
| Cable Diagnostics | LinkMD |
| Power-Saving Features | Supported |
| Package | 64-pin QFN |
| Package Dimensions | 8 mm x 8 mm |
| Lead-Free Status | Lead-free package |
| Mounting Type | Surface mount |
KSZ9031MNXIC 8 mm x 8 mm Pin Configuration Guide
Pin configuration for KSZ9031MNXIC (8 mm x 8 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 KSZ9031MNXIC.
Refer to the datasheet for full pin configuration.
Typical Applications
KSZ9031MNXIC is suitable for 6 applications: Automotive Ethernet Gateway, Industrial Network Switch, Vehicle Infotainment System, Embedded Network Controller, Network-Attached Test Equipment, Industrial Sensor Network Gateway.
Automotive Ethernet Gateway
The KSZ9031MNXIC fits an automotive Ethernet gateway because Microchip identifies it as an automotive-qualified PHY supporting 10Base-T, 100Base-TX, and 1000Base-T. Its GMII/MII interface connects the PHY to a network controller, while LinkMD assists cable troubleshooting in installed vehicles. Integration reduces the number of separate copper-speed PHYs and simplifies management across 10, 100, and 1000 Mb/s links. Validate the exact qualification grade, supply voltages, magnetics, and automotive timing margins against the full datasheet before production release.
Recommended
Industrial Network Switch
The KSZ9031MNXIC can support copper ports in an industrial network switch that must accommodate 10, 100, and 1000 Mb/s Ethernet links. Triple-speed operation allows one PHY design to cover legacy and Gigabit equipment, while LinkMD helps maintenance teams identify cabling problems. The 64-QFN, 8 mm by 8 mm surface-mount package permits compact port-density layouts. Designers should follow the manufacturer reference layout and carefully control high-speed differential routing, power delivery, grounding, and the interface between the PHY and switching fabric.
Recommended
Vehicle Infotainment System
The KSZ9031MNXIC is suitable for a vehicle infotainment system requiring a reliable copper Ethernet connection between an entertainment controller and vehicle network equipment. Support for 10Base-T, 100Base-TX, and 1000Base-T provides compatibility across service, control, and high-bandwidth links. GMII/MII connectivity enables use with digital controllers, while LinkMD assists installation diagnostics. Because infotainment modules can operate in compact, thermally variable enclosures, engineers must confirm the exact temperature grade, package thermal data, supply tolerance, and EMC implementation before deployment.
Recommended
Embedded Network Controller
The KSZ9031MNXIC can add copper Ethernet connectivity to an embedded controller, processor, or programmable logic design that uses a compatible GMII or MII interface. Triple-speed support enables network negotiation across 10, 100, and 1000 Mb/s rather than requiring a separate PHY for every rate. The 64-QFN package supports compact surface-mount assembly, but high-speed interface timing and differential routing remain critical. Confirm signal levels, clocking, reset requirements, interrupt behavior, and exposed-pad connection from the complete manufacturer documentation before schematic capture.
Recommended
Network-Attached Test Equipment
The KSZ9031MNXIC is appropriate for test and measurement equipment requiring flexible copper Ethernet compatibility during development, configuration, and service. Supporting all three standard rates lets the instrument communicate with 10 Mb/s legacy equipment, 100 Mb/s industrial devices, and 1000 Mb/s infrastructure. LinkMD can assist operators in identifying cable faults, while GMII/MII support gives the design flexibility in controller selection. Ensure the enclosure, power supply, thermal design, and Ethernet magnetics meet the equipment’s environmental and isolation requirements.
Recommended
Industrial Sensor Network Gateway
The KSZ9031MNXIC can serve as the Ethernet front end of an industrial sensor-network gateway collecting data from 10, 100, or 1000 Mb/s devices. Triple-speed compatibility prevents speed incompatibility from limiting deployment when the network includes legacy controllers and modern high-bandwidth equipment. LinkMD diagnostics can help maintenance teams locate field cabling problems, while the compact 64-QFN package supports space-constrained gateway boards. The implementation should follow the manufacturer’s reference layout and verify surge, grounding, isolation, and cable-length requirements for the installation environment.
Recommended
Recommended Products Summary
Engineering reference data for KSZ9031MNXIC — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | KSZ9031MNXIA |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
Key Differentiators
- One PHY covers three copper Ethernet rates (vs KSZ9031MNXIA)
- Automotive-focused PHY positioning with cable diagnostics (vs KSZ9025MNXIC)
- Documented copper-wire option uses the same KSZ9031MNX family (vs KSZ9031MNXIC gold-bonded-wire version)
Design Notes
Use the manufacturer’s reference schematic, pinout, and 64-QFN land pattern rather than reconstructing the layout from generic QFN conventions. Route the Ethernet differential pairs as controlled-impedance nets, minimize stubs and vias, provide a continuous return path, and keep external magnetics or connector structures close to the appropriate PHY pins. Confirm the exposed-pad connection and recommended via array from the current package drawing before fabrication.
Implement the complete power network described in the KSZ9031 datasheet, including the required supply sequencing, decoupling, and exposed-pad connection. Place decoupling capacitors close to their associated supply pins and preserve a low-impedance ground return. The supplied verified snippets do not include numeric supply-voltage or current limits, so those values must be taken from the manufacturer electrical-characteristics tables before component selection and power budgeting.
Validate GMII/MII timing, clock sources, reset behavior, and signal levels against the selected digital controller. Ethernet differential routing also depends on the intended speed, trace geometry, reference plane, cable, connector, and magnetics; nominal data-rate compliance alone does not guarantee field margin. Use the manufacturer’s layout guidance and hardware measurements to verify eye quality, return loss, insertion loss, and radiated emissions for the final assembly.
Do not treat any Ethernet PHY with 10/100/1000 Mb/s support as a drop-in substitute. A safe replacement must also match the 64-QFN footprint, pin functions, supply rails, interface timing, reset and clock requirements, cable characteristics, qualification, and exposed-pad layout. KSZ9031MNXIA is documented as differing only in bonding-wire material, but verify orderable status and approval requirements before using it in an automotive production design.
Compliance Information
Microchip describes the KSZ9031 family as automotive qualified and identifies a lead-free 64-pin QFN package. The supplied snippets do not explicitly state RoHS, REACH, halogen-free, or conflict-minerals status, so those fields remain unknown.
