KSZ9031RNXIA - Gigabit Ethernet PHY Transceiver RGMII | Microchip
N.º de pieza: KSZ9031RNXIA ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $5.45 | $5,45 |
| 10 | $4.92 | $49,20 |
| 100 | $4.18 | $418,00 |
| 500 | $3.65 | $1.825,00 |
| 1.000 | $3.27 | $3.270,00 |
KSZ9031RNXIA Descripción general
An Ethernet PHY (Physical Layer transceiver) is a critical mixed-signal IC that sits between the digital MAC (Media Access Controller) in a processor/switch and the analog copper cable. PHY transceivers handle line coding (PAM-3/PAM-5 for 1000BASE-T), echo cancellation, crosstalk mitigation, and link training; they sit below the MAC in the OSI model hierarchy: PHY -> transceiver -> network interface -> wired connectivity IC. The KSZ9031 family occupies the Gigabit Ethernet PHY category within Power-over-Ethernet-aware wired networking semiconductors.
Key features include Wake-on-LAN support, LinkMD cable diagnostics for cable plant fault detection, Auto-MDI/MDIX crossover, jumbo frame support up to 9.6 KB, and an integrated 1.2V LDO regulator. The RGMII interface supports 1.5V/1.8V/2.5V/3.3V HSTL, SSTL, or LVCMOS signaling to a wide range of MACs, FPGAs, and Ethernet switches. Energy-detect power-down and EEE (Energy Efficient Ethernet) further reduce system power consumption during idle link states.
The KSZ9031 uses DSP-based echo and crosstalk mitigation, on-chip termination resistors, and adaptive equalization to deliver robust 1000BASE-T performance over marginal cable plants. The device provides two LED outputs, an MDIO management interface, and requires only a single 25 MHz reference clock.
Typical applications include industrial Ethernet switches, factory automation controllers, automotive infotainment/networking, IP cameras and surveillance, network printers, and any embedded system requiring 10/100/1000 Mbps copper Ethernet connectivity with RGMII host interface. The KSZ9031 is AEC-Q100 qualified for automotive use.
When designing with this device, provide a clean analog supply (AVDDH 3.3V) and digital supply decoupling per the datasheet reference circuit; place the 48-pin QFN thermal/exposed pad onto a proper ground-solder land with multiple thermal vias for reliable operation. Use the MDIO/MDC pins for PHY management and configuration.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas directas para KSZ9031RNXIA — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con KSZ9031RNXIA (mismo factor de forma y huella) — difiere en Package, MAC Interface, Data Rate, Cable Type, Operating Temperature.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
KSZ9031RNXCC
✅ Sustitución directa✓ En stock
$4.05 / unidad
Ver hoja de datos →KSZ9131RNX
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
KSZ9031RNXIA Especificaciones
| Product Type | Ethernet Transceiver (PHY) |
| Velocidad de datos | 10/100/1000 Mbps |
| Standards Supported | 10Base-T, 100Base-TX, 1000Base-T |
| MAC Interface | RGMII |
| Number of Ports | 1 Port |
| Supply Voltage (VDDIO) | 1.8V / 2.5V / 3.3V |
| Analog Supply Voltage | 3.3V |
| Cable Type | CAT-5 UTP |
| Encapsulado | 48-QFN (7x7 mm) |
| Temperatura de funcionamiento | -40C to +85C (Industrial) |
| AEC-Q100 Qualified | Yes (Automotive) |
| Jumbo Frame Support | Up to 9.6 KB |
| Auto-MDI/MDIX | Yes |
| Wake-on-LAN | Yes |
| LinkMD Cable Diagnostics | Yes |
| EEE (Energy Efficient Ethernet) | Yes |
| MDIO Management Interface | Yes |
| Reference Clock | 25 MHz |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
Configuración de pines de KSZ9031RNXIA
| Pin 1 | AVDDH — Analog 3.3V supply |
| Pin 2 | TXRXP_A — Differential pair A (MDI) |
| Pin 3 | TXRXN_A — Differential pair A complement |
| Pin 4 | AVDDH — Analog 3.3V supply |
| Pin 5 | TXRXP_B — Differential pair B (MDI) |
| Pin 6 | TXRXN_B — Differential pair B complement |
| Pin 7 | AVDDH — Analog 3.3V supply |
| Pin 8 | TXRXP_C — Differential pair C (MDI) |
| Pin 9 | TXRXN_C — Differential pair C complement |
| Pin 10 | AVDDH — Analog 3.3V supply |
| Pin 11 | TXRXP_D — Differential pair D (MDI) |
| Pin 12 | TXRXN_D — Differential pair D complement |
| Pin 13 | AVDDL — Analog 1.2V LDO output |
| Pin 14 | AVDDL — Analog 1.2V LDO output |
| Pin 15 | RSET — Reference resistor |
| Pin 16 | GND — Ground |
| Pin 17 | NC — Not connected (per datasheet) |
| Pin 18 | TX_CLK — RGMII transmit clock |
| Pin 19 | TXD0 — RGMII transmit data 0 |
| Pin 20 | TXD1 — RGMII transmit data 1 |
| Pin 21 | TXD2 — RGMII transmit data 2 |
| Pin 22 | TXD3 — RGMII transmit data 3 |
| Pin 23 | TX_CTL — RGMII transmit control |
| Pin 24 | VDDIO — MAC IO supply |
| Pin 25 | RX_CLK — RGMII receive clock |
| Pin 26 | RXD0 — RGMII receive data 0 |
| Pin 27 | RXD1 — RGMII receive data 1 |
| Pin 28 | RXD2 — RGMII receive data 2 |
| Pin 29 | RXD3 — RGMII receive data 3 |
| Pin 30 | RX_CTL — RGMII receive control |
| Pin 31 | MDC — Management data clock |
| Pin 32 | MDIO — Management data I/O |
| Pin 33 | INT_N — Interrupt output (active low) |
| Pin 34 | RST_N — Hardware reset (active low) |
| Pin 35 | LED2 — LED indicator 2 |
| Pin 36 | LED1 — LED indicator 1 |
| Pin 37 | CLK125_NDO — 125 MHz clock output |
| Pin 38 | REF_CLK — 25 MHz reference clock input |
| Pin 39 | VDDIO — MAC IO supply |
| Pin 40 | GND — Ground |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | DVDDL — Digital 1.2V supply |
| Pin 47 | DVDDH — Digital 3.3V supply |
| Pin 48 | GND — Ground (exposed pad) |
Aplicaciones típicas
KSZ9031RNXIA es adecuado para 6 aplicacións: Industrial Ethernet Switches, Automotive Infotainment & ADAS Networking, IP Cameras & Surveillance Systems, Network Printers & Multi-function Devices, Embedded IoT Gateways & Edge Devices, Test & Measurement Instrumentation.
Industrial Ethernet Switches
The KSZ9031RNXIA fits industrial Ethernet switches because its 1000Base-T PHY core, RGMII interface, and -40C to +85C industrial temperature grade allow deployment in factory-floor cabinets, outdoor enclosures, and harsh industrial environments. Its LinkMD cable diagnostics detect open/short cable plant issues without external TDR hardware, and the AEC-Q100 qualification supports automotive-adjacent industrial use cases. Power dissipation of approximately 0.7W at full gigabit traffic requires a 4-layer PCB with a ground-copper thermal pour under the QFN exposed pad. Placed between the switch ASIC's RGMII port and the magnetics/RJ45 jack, the device provides 10/100/1000 Mbps with auto-MDI/MDIX for crossover-free cabling.
Recomendado
Automotive Infotainment & ADAS Networking
The KSZ9031RNXIA fits automotive networking because AEC-Q100 qualification, industrial temperature, and automotive-grade reliability address infotainment head units, telematics control units, and ADAS domain controllers. The RGMII interface connects to NXP i.MX, Renesas R-Car, and other automotive SoCs, providing a 1000Base-T backbone for camera aggregation and V2X gateways. Wake-on-LAN enables ECU wake-from-sleep for OBD diagnostics, and the integrated 1.2V LDO reduces BOM. Power dissipation is approximately 0.7W under gigabit traffic with EEE reducing idle power.
Recomendado
IP Cameras & Surveillance Systems
The KSZ9031RNXIA fits IP cameras and surveillance systems because its 1000Base-T bandwidth supports 4K/8K video streams, and the RGMII interface connects to camera SoCs like Ambarella and HiSilicon. LinkMD cable diagnostics detect PoE cable plant degradation (no PoE on this part, but cable quality affects both data and PoE), while the small 48-QFN 7x7 mm package fits inside dome-camera enclosures. Auto-MDI/MDIX eliminates crossover cable requirements during commissioning. Power dissipation is approximately 0.7W at gigabit, with EEE reducing idle to approximately 0.4W for solar/battery installations.
Recomendado
Network Printers & Multi-function Devices
The KSZ9031RNXIA fits network printers and MFPs by providing reliable gigabit connectivity for high-speed print jobs, scan-to-email workflows, and cloud services. The RGMII interface connects to printer SoCs, and the industrial temperature grade supports the wide thermal envelope of laser-printer engines. Jumbo frame support up to 9.6 KB accelerates large image transfers, while Wake-on-LAN enables remote wake for scheduled print jobs. Power dissipation of approximately 0.7W at gigabit traffic is acceptable in a printer's typical 30-50W power envelope.
Recomendado
Embedded IoT Gateways & Edge Devices
The KSZ9031RNXIA fits IoT gateways and edge devices because the gigabit PHY provides high-bandwidth uplink for aggregating multiple downstream sensors, cameras, or field buses. The RGMII connects to NXP i.MX, Microchip SAMA7, or other application gateways, while the industrial temperature grade supports outdoor cabinet deployment. EEE reduces idle power in battery-backed edge nodes. Power dissipation of approximately 0.7W at gigabit traffic plus 0.4W idle is suitable for PoE-powered edge devices.
Recomendado
Test & Measurement Instrumentation
The KSZ9031RNXIA fits test and measurement instruments such as oscilloscopes, logic analyzers, and spectrum analyzers that stream high-bandwidth data to host PCs over gigabit Ethernet. The RGMII interface connects to instrument FPGAs and SoCs, while industrial temperature supports lab and field environments. LinkMD cable diagnostics help technicians debug connectivity issues during deployment. Power dissipation of approximately 0.7W fits the dense thermal budgets of multi-channel instruments.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para KSZ9031RNXIA — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | KSZ9031RNXCC | KSZ9131RNX |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-QFN (7x7 mm) | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same |
| Data Rate | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps |
| MAC Interface | RGMII | RGMII | RGMII (TSN-capable) |
| Operating Temperature | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) |
| AEC-Q100 Qualified | Yes | No | Yes |
| LinkMD Cable Diagnostics | Yes | Yes | Enhanced |
| Jumbo Frame Support | 9.6 KB | 9.6 KB | 9.6 KB |
| Unit Price (qty 1) | ~$5.45 | ~$3.50 | ~$5.50 |
Diferenciadores clave
- AEC-Q100 qualified for automotive deployments (frente a KSZ9031RNXCC)
- Pin-compatible successor available for new designs (frente a KSZ9131RNX)
- Integrated LinkMD cable diagnostics vs competitors (frente a Generic PHY)
Notas de diseño
Provide separate analog (AVDDH 3.3V) and digital (DVDDH 3.3V) supplies with ferrite-bead or LC filtering between them, as the PHY is sensitive to digital switching noise coupling into the analog MDI front-end. Place 10uF bulk + 0.1uF ceramic decoupling near each AVDDH/DVDH/VDDIO pin. The on-chip 1.2V LDO (AVDDL/DVDDL) requires external capacitors per datasheet reference circuit; estimated total device power dissipation is approximately 0.7W at full gigabit traffic and approximately 0.4W in idle/EEE.
The 48-QFN (7x7 mm) package has an exposed thermal pad that MUST be soldered to a properly sized copper pour (minimum 100 mm^2) on the top layer, with multiple thermal vias (typically 9-16 vias of 0.3 mm drill) connecting to an internal ground plane. Without proper thermal management, the junction temperature can exceed the -40C to +85C industrial rating under continuous gigabit traffic, especially in enclosed industrial cabinets. Estimated theta_JA on a properly thermal-via'd 4-layer PCB is approximately 30 C/W.
Route the MDI differential pairs (TXRXP_A/N through TXRXP_D/N) as 100-ohm differential impedance with intra-pair length matching under 0.5 mm; route them on the top layer directly over a continuous ground plane for return-path continuity. Keep the 1000Base-T traces short (<50 mm) and avoid right-angle bends. Place the magnetics within 25 mm of the RJ45 connector and within 50 mm of the PHY MDI pins for signal integrity and EMI compliance.
Common pitfalls include (1) omitting the 25 MHz reference clock load capacitors, causing frequency error; (2) forgetting the MDIO pull-up to VDDIO, preventing PHY management access; (3) routing MDI traces over power planes or with impedance mismatch, causing 1000Base-T link failures; (4) not soldering the exposed thermal pad, leading to thermal shutdown under load; (5) using a non-1.8V/2.5V/3.3V-capable MAC, requiring level shifters; (6) failing to strap the CONFIG pins for the desired default mode, leading to non-optimal PHY behavior at first power-up.
Información de cumplimiento
AEC-Q100 qualified per Microchip product page; RoHS and REACH compliant per datasheet. Lead-free and halogen-free packaging.
