KSZ9031RNXUB-VAO - Gigabit Ethernet Transceiver, AEC-Q100, WQFN-48 | Microchip
料号： KSZ9031RNXUB-VAO ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $8.85 | $8.85 |
| 10 | $8.05 | $80.50 |
| 100 | $7.2 | $720.00 |
| 500 | $6.55 | $3,275.00 |
| 1,000 | $6.1 | $6,100.00 |
KSZ9031RNXUB-VAO 概述
A Gigabit Ethernet transceiver (PHY) is a physical-layer device that converts between the digital MAC-side interface (here, RGMII) and the analog line-side signaling on copper twisted-pair cable. It sits between an Ethernet MAC (typically inside an SoC, FPGA, or Ethernet switch) and the RJ45 magnetics/MDI connector, and is the cornerstone of any 1000Base-T link. The KSZ9031 belongs to the broader Ethernet PHY hierarchy: Ethernet transceiver -> physical layer device (PHY) -> network interface IC -> wired networking semiconductor.
Key features include a 125 MHz reference clock output, energy-detect power-down for reduced power when no cable is attached, Wake-on-LAN (WOL) support with robust custom-packet detection, programmable LED outputs for link/activity/speed indication, and remote and local loopback for verifying analog and digital data paths. The standard KSZ9031RNX is offered in 48-pin QFN; the AEC-Q100 automotive variants KSZ9031RNXUB-VAO and KSZ9031RNXVB-VAO use the 48-pin lead-free WQFN. The KSZ9031MNX version provides a 64-pin QFN footprint.
Technically, the device integrates all front-end analog blocks - the 10/100/1000 Mbps PHY, MDI termination resistors, baseline wander correction, adaptive equalization, and crosstalk cancellation - to deliver robust 1000Base-T performance over CAT-5 cable. The RGMII interface supports 1.5V/1.8V/2.5V/3.3V HSTL signaling and provides TX/RX clocks, data, and control. Energy-detect mode drops power consumption to approximately 75 mW when the link partner is disconnected.
Typical applications include automotive infotainment, telematics, ADAS camera links, industrial Ethernet gateways, automotive gateways, and in-vehicle networking backbones where AEC-Q100 qualification is mandatory. Designers also use this part in ruggedized industrial switches and routers that demand the same automotive-grade reliability.
When designing with the KSZ9031RNXUB-VAO, follow the reference schematic's recommended 1.2V/2.5V power-rail decoupling and 25 MHz reference-clock layout. Use the integrated termination resistors to minimize external component count, and ensure the magnetics meet the IEEE 802.3 return-loss specification for the chosen cable length.
This page synthesizes distributor pricing, AEC-Q100 compliance details, drop-in Microchip alternatives, and reference design considerations not found in the manufacturer datasheet.
直接替换替代料： KSZ9031RNXUB-VAO ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： KSZ9031RNXUB-VAO （相同外形与封装尺寸） ——差异在于 Package, MAC Interface, Product Type, Operating Temperature, Supply Voltage.
快速对比工具——选择替代料号进行并排对比：
KSZ9031RNXVB-VAO
✅ 直接替换✓ 有现货
$5.65 / 个
查看数据手册 →KSZ9031RNXUB-TRVAO
✅ 直接替换✓ 有现货
$5.01 / 个
查看数据手册 →KSZ9031RNXIA
✅ 直接替换✓ 有现货
$3.27 / 个
查看数据手册 →KSZ9031RNXIC-TR
✅ 直接替换✓ 有现货
$4.3 / 个
查看数据手册 →KSZ9031RNXCC
✅ 直接替换✓ 有现货
$4.05 / 个
查看数据手册 →DP83869HMRGZT
✅ 直接替换✓ 有现货
$9.3 / 个
查看数据手册 →KSZ9031RNXUB-VAO 规格参数
| Product Type | Ethernet Physical Layer Transceiver (PHY) |
| 数据速率 | 10/100/1000 Mbps (triple-speed) |
| Standards Supported | 10Base-T, 100Base-TX, 1000Base-T (IEEE 802.3) |
| MAC Interface | RGMII (Reduced Gigabit Media Independent Interface) |
| Cable Type | CAT-5 UTP (unshielded twisted pair) |
| 封装 | 48-pin WQFN (7x7 mm), lead-free |
| 安装类型 | Surface Mount |
| 工作温度 | -40C to +85C (automotive AEC-Q100 grade) |
| AEC-Q100 Qualification | Qualified (automotive grade) |
| Power Consumption (Energy-Detect) | ~75 mW when cable not attached |
| Reference Clock Output | 125 MHz |
| Wake-on-LAN | Yes, with custom-packet detection |
| On-chip Termination Resistors | Yes (integrated MDI termination) |
| LED Outputs | Programmable (link/activity/speed) |
| Loopback Modes | Remote and local loopback |
| Baseline Wander Correction | Integrated |
| Adaptive Equalization | Integrated |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
KSZ9031RNXUB-VAO 引脚配置
| 引脚 1 | TXC — RGMII transmit clock |
| 引脚 2 | TXD0 — RGMII transmit data bit 0 |
| 引脚 3 | TXD1 — RGMII transmit data bit 1 |
| 引脚 4 | TXD2 — RGMII transmit data bit 2 |
| 引脚 5 | TXD3 — RGMII transmit data bit 3 |
| 引脚 6 | TXCTL — RGMII transmit control |
| 引脚 7 | RXC — RGMII receive clock |
| 引脚 8 | RXD0 — RGMII receive data bit 0 |
| 引脚 9 | RXD1 — RGMII receive data bit 1 |
| 引脚 10 | RXD2 — RGMII receive data bit 2 |
| 引脚 11 | RXD3 — RGMII receive data bit 3 |
| 引脚 12 | RXCTL — RGMII receive control |
| 引脚 13 | MDC — Management data clock |
| 引脚 14 | MDIO — Management data input/output |
| 引脚 15 | RESETn — Hardware reset (active low) |
| 引脚 16 | INTRn — Interrupt output (active low) |
| 引脚 17 | LED0 — Programmable LED output 0 |
| 引脚 18 | LED1 — Programmable LED output 1 |
| 引脚 19 | LED2 — Programmable LED output 2 |
| 引脚 20 | REF_CLK — 25 MHz reference clock input |
| 引脚 21 | CLK125_OUT — 125 MHz reference clock output |
| 引脚 22 | VDDIO — I/O supply voltage (1.5/1.8/2.5/3.3V) |
| 引脚 23 | VDD1P2 — 1.2V digital core supply |
| 引脚 24 | VDDA2P5 — 2.5V analog supply |
| 引脚 25 | VSS — Ground |
| 引脚 26 | TXRP — MDI differential pair 0 positive |
| 引脚 27 | TXRN — MDI differential pair 0 negative |
| 引脚 28 | TXVP — MDI differential pair 1 positive |
| 引脚 29 | TXVN — MDI differential pair 1 negative |
| 引脚 30 | TXDP — MDI differential pair 2 positive |
| 引脚 31 | TXDN — MDI differential pair 2 negative |
| 引脚 32 | TXCP — MDI differential pair 3 positive |
| 引脚 33 | TXCN — MDI differential pair 3 negative |
| 引脚 34 | RXDP — MDI receive pair 2 positive |
| 引脚 35 | RXDN — MDI receive pair 2 negative |
| 引脚 36 | RXCP — MDI receive pair 3 positive |
| 引脚 37 | RXCN — MDI receive pair 3 negative |
| 引脚 38 | RXVP — MDI receive pair 1 positive |
| 引脚 39 | RXVN — MDI receive pair 1 negative |
| 引脚 40 | RXRP — MDI receive pair 0 positive |
| 引脚 41 | RXRN — MDI receive pair 0 negative |
| 引脚 42 | AVSS — Analog ground |
| 引脚 43 | NC — Not connected (per datasheet) |
| 引脚 44 | NC — Not connected (per datasheet) |
| 引脚 45 | NC — Not connected (per datasheet) |
| 引脚 46 | NC — Not connected (per datasheet) |
| 引脚 47 | NC — Not connected (per datasheet) |
| 引脚 48 | EPAD — Exposed thermal pad (connect to ground) |
典型应用
KSZ9031RNXUB-VAO 适用于 6 应用s: Automotive Infotainment Ethernet Backbone, ADAS Camera Ethernet Link, Automotive Gateway ECU, Industrial Ethernet Switches and Routers, Telematics and V2X Communication Modules, Medical Imaging and Diagnostic Equipment.
Automotive Infotainment Ethernet Backbone
The KSZ9031RNXUB-VAO's AEC-Q100 qualification and -40C to +85C operating range make it ideal for automotive infotainment head units that require 1000Base-T connectivity over CAT-5 UTP cable. Its integrated MDI termination resistors and RGMII MAC interface reduce BOM count, while Wake-on-LAN supports remote system wake-up for parked-vehicle diagnostics. Designers typically place the PHY between the head-unit SoC's RGMII port and the RJ45 magnetics, with 1.2V/2.5V LDO rails feeding the analog/digital domains. The part's 125 MHz reference clock output simplifies clock-tree design across the head unit.
推荐
ADAS Camera Ethernet Link
Advanced driver-assistance systems (ADAS) front and surround-view cameras often stream uncompressed video over 1000Base-T, and the KSZ9031RNXUB-VAO provides the AEC-Q100-qualified PHY for these high-bandwidth links. The device's adaptive equalization and baseline-wander correction deliver robust 1000 Mbps over the long cable runs typical of vehicle camera harnesses, while the energy-detect power-down mode (~75 mW) preserves battery when the vehicle is parked. The RGMII interface connects directly to the camera SoC or FPGA serializer, and the programmable LED outputs can indicate link/activity status for diagnostics.
推荐
Automotive Gateway ECU
Central and zonal automotive gateways aggregate multiple in-vehicle networks (CAN, LIN, FlexRay, automotive Ethernet), and the KSZ9031RNXUB-VAO supplies the 1000Base-T PHY for the gateway's Ethernet backbone. Its AEC-Q100 qualification, integrated termination, and Wake-on-LAN with custom-packet detection are critical for gateway ECUs that must wake the network on specific OEM-defined wake-up frames. The RGMII interface allows direct connection to automotive gateway SoCs, and the 48-pin WQFN package fits typical gateway PCB layouts with 4-layer stack-ups.
推荐
Industrial Ethernet Switches and Routers
Ruggedized industrial Ethernet switches serving factory automation, outdoor cabinets, or transportation infrastructure benefit from the KSZ9031RNXUB-VAO's wide temperature range and AEC-Q100 pedigree, which provides headroom for harsh-environment reliability. The PHY's RGMII interface connects to most industrial Ethernet switch ASICs, and the integrated termination reduces BOM for cost-sensitive designs. Energy-detect power-down is valuable in solar-powered or PoE-PD switches that must minimize quiescent draw. Designers can use the local/remote loopback modes for in-field cable diagnostics.
推荐
Telematics and V2X Communication Modules
Telematics control units (TCUs) and V2X onboard units require reliable Ethernet connectivity for backhaul, OTA updates, and V2X message exchange, and the KSZ9031RNXUB-VAO's automotive qualification ensures compliance. The PHY's RGMII interface connects to telematics SoCs and modems, while Wake-on-LAN allows the TCU to wake the head unit or gateway on demand. The integrated termination reduces module size, and the 48-pin WQFN fits the compact PCB area typical of telematics modules mounted behind the dashboard or in the roof console.
推荐
Medical Imaging and Diagnostic Equipment
Medical imaging modalities such as ultrasound, endoscopy, and surgical displays increasingly use 1000Base-T to move uncompressed video between the acquisition unit and the console, and the KSZ9031RNXUB-VAO's low-latency RGMII interface and -40C to +85C range serve these designs. The integrated MDI termination shrinks the analog front-end footprint, and the Wake-on-LAN feature supports remote diagnostics and service wake-up. For medical designs that do not require AEC-Q100, the industrial-grade KSZ9031RNXIA in the same 48-pin WQFN package offers an equivalent pin-compatible option.
推荐
推荐产品汇总
工程参考数据： KSZ9031RNXUB-VAO ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | KSZ9031RNXVB-VAO | KSZ9031RNXUB-TRVAO | KSZ9031RNXIA | KSZ9031RNXIC-TR | KSZ9031RNXCC | DP83869HMRGZT |
|---|---|---|---|---|---|---|---|
| Package | WQFN-48 (7x7 mm) | WQFN-48 (7x7 mm) - same | WQFN-48 (7x7 mm) - same | WQFN-48 (7x7 mm) - same | WQFN-48 (7x7 mm) - same | WQFN-48 (7x7 mm) - same | QFN-48 - same pin count |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Texas Instruments |
| AEC-Q100 Qualification | Qualified (automotive grade) | Qualified (automotive grade) | Qualified (automotive grade) | Industrial grade (-40C to +85C) | Commercial grade | Commercial grade | Industrial/automotive (variant dependent) |
| Data Rate | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps |
| MAC Interface | RGMII | RGMII | RGMII | RGMII | RGMII | RGMII | RGMII |
| Reference Clock Output | 125 MHz | 125 MHz | 125 MHz | 125 MHz | 125 MHz | 125 MHz | 25/50/125 MHz (configurable) |
| Wake-on-LAN | Yes (with custom-packet detection) | Yes (with custom-packet detection) | Yes (with custom-packet detection) | Yes (with custom-packet detection) | Yes (with custom-packet detection) | Yes (with custom-packet detection) | Yes (variant dependent) |
| Integrated MDI Termination | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
关键差异点
- AEC-Q100 automotive-qualified in the same 48-pin WQFN footprint （对比 KSZ9031RNXIA)
- Pin-to-pin compatibility with the KSZ9031 automotive family （对比 KSZ9031MNXIC)
- Cross-brand automotive Gigabit PHY alternative （对比 DP83869HMRGZT)
设计说明
Place the KSZ9031RNXUB-VAO as close as possible to the RJ45 magnetics to minimize MDI trace length. Route the four MDI differential pairs with 100-ohm differential impedance, length-matched within 50 mils, and keep them away from switching power and digital clocks. Use a continuous ground plane under the MDI traces, and stitch the ground coppers with vias around the WQFN-48 thermal pad for return-path integrity and thermal dissipation.
The KSZ9031RNXUB-VAO requires three power rails: 2.5V (analog, VDDA2P5), 1.2V (digital core, VDD1P2), and the MAC-side VDDIO (1.5/1.8/2.5/3.3V). Place a 10uF bulk plus 0.1uF and 0.01uF ceramic decoupling capacitor at each supply pin, located within 2 mm of the pin. The exposed thermal pad (EPAD) MUST be soldered to a continuous ground plane for thermal dissipation and electrical ground reference. Power-rail sequencing typically follows datasheet recommendation: 2.5V first, then 1.2V, then VDDIO, with RESETn held low until all rails are stable.
Common pitfalls when designing with the KSZ9031RNXUB-VAO include: (1) forgetting to strap the CONFIG[2:0] pins to set the default PHY address and operating mode, which can cause MDIO addressing conflicts on multi-PHY designs; (2) leaving the reference clock (REF_CLK) floating rather than driving it with a low-jitter 25 MHz source; (3) not connecting the EPAD thermal pad, which can cause thermal runaway at automotive-grade temperatures; (4) using a non-AEC-Q100 variant when automotive qualification is required - always verify the -VAO suffix on automotive designs.
RGMII trace routing requires careful length-matching: TXC/TXD/TXCTL must be length-matched within 50 mils of each other, and RXC/RXD/RXCTL likewise, with the RX group phase-aligned to the TX group per RGMII v2.0 specification. Use 50-ohm single-ended impedance for RGMII traces, and place a 22-ohm series termination resistor near the KSZ9031RNXUB-VAO if VDDIO exceeds 1.8V. Avoid routing RGMII across plane splits, and provide a continuous ground reference beneath all RGMII traces.
合规信息
AEC-Q100 automotive qualified per Microchip KSZ9031 product page. RoHS and REACH compliant per Microchip product declaration. Lead-free WQFN package. Halogen-free status not explicitly stated in provided data.
