KSZ9031RNXVB-TRVAO - Gigabit Ethernet Transceiver, RGMII, QFN-48 | Microchip
MPN: KSZ9031RNXVB-TRVAO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.59 | $8.59 |
| 10 | $7.95 | $79.50 |
| 100 | $6.85 | $685.00 |
| 500 | $5.9 | $2,950.00 |
| 1,000 | $5.1 | $5,100.00 |
KSZ9031RNXVB-TRVAO Overview
A Gigabit Ethernet physical-layer transceiver (PHY) is the analog front-end IC that connects a digital MAC/controller to the copper media, handling line encoding/decoding, echo cancellation, cross-talk suppression, and link-training required for 1000BASE-T operation. The KSZ9031 belongs to the broader Ethernet PHY family (10/100/1000 transceiver -> Ethernet transceiver -> network interface IC -> semiconductor). It sits at OSI layer 1 of the networking stack, upstream of magnetics and RJ-45 connector, and downstream of the MAC-side RGMII/SGMII interface.
Key features include 10/100/1000 Mbps triple-speed auto-negotiation, RGMII v1.3 / v2.0 MAC-side interface with HSTL or 1.8/2.5/3.3V selectable I/O, on-chip termination resistors for differential pairs, baseline wander correction, programmable LED outputs for link/activity/speed, and Wake-on-LAN (WOL) support with custom-packet detection. A low-latency 1000BASE-T receive path and integrated 1.2V LDO simplify BOM.
Architecture is built on a DSP-based echo canceller and AFE using a 0.13um CMOS process, integrating all active magnetics-less PHY functions except the 1:1 isolation transformer and RJ-45. Reference clock can be sourced from a 25 MHz crystal or external oscillator. JTAG boundary-scan support is provided for board-level test.
Typical applications include automotive infotainment Ethernet backbones, industrial Ethernet switches/routers, set-top box and IPTV MAC interfaces, network printers, gigabit uplink PHY for SBCs/SoCs, and ADAS camera networks. The 48-WQFN package is footprint-compatible with other KSZ9031 family members and several third-party Gigabit PHYs, easing dual-sourcing.
When designing, place the KSZ9031 within 1 cm of the magnetics and route each MDI pair as a 100-ohm differential with intra-pair length matching under 0.5 mm. Provide a solid GND reference on layer 2 under the PHY, and decouple AVDD/AVDDPLL/DVDD with 0.1uF X7R plus 10uF bulk capacitors as close to each pin as possible.
This page synthesizes distributor pricing, automotive-grade alternatives, and PCB-layout design notes beyond the manufacturer datasheet summary to support rapid PHY selection for Gigabit Ethernet designs.
Drop-in alternatives for KSZ9031RNXVB-TRVAO — 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 KSZ9031RNXVB-TRVAO (same form factor and footprint) — differing in Package, Product Type, MAC Interface, Operating Temperature, LED Outputs.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
KSZ9031RNXVB-VAO
✅ Drop-In✓ In Stock
$5.65 / Unit
View Datasheet →KSZ9031RNXUB-TRVAO
✅ Drop-In✓ In Stock
$5.01 / Unit
View Datasheet →KSZ9031RNXUB-VAO
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →KSZ9031RNXIC-TR
✅ Drop-In✓ In Stock
$4.3 / Unit
View Datasheet →RTL8211F-CG
✅ Drop-In📋 Reference alternative (not in catalog)
KSZ9031RNXVB-TRVAO Specifications
| Product Type | Gigabit Ethernet Physical Layer Transceiver (PHY) |
| Data Rate | 10/100/1000 Mbps |
| Standards Supported | 10Base-T, 100Base-TX, 1000Base-T (IEEE 802.3) |
| MAC-Side Interface | RGMII v1.3 / v2.0 (HSTL selectable) |
| MDI Interface | 4-pair differential, on-chip termination |
| Cable Type | CAT-5 / CAT-5e UTP |
| Reference Clock Input | 25 MHz crystal or external oscillator |
| Reference Clock Output | 125 MHz |
| Supply Voltage (DVDD) | 1.2 V (typ) |
| Supply Voltage (AVDD/IO) | 2.5 V / 3.3 V |
| Power-Down Mode | Energy-detect, Wake-on-LAN (WOL) |
| LED Outputs | Programmable (link, activity, speed) |
| Package | 48-pin WQFN (lead-free) |
| Mounting Type | Surface Mount |
| Operating Temperature (Automotive) | -40C to +85C (min) |
| Automotive Qualification | AEC-Q100 (TRVAO suffix) |
| RoHS Status | Compliant |
| JTAG / Boundary Scan | Yes |
KSZ9031RNXVB-TRVAO 48-pin wqfn (lead-free) Pin Configuration Guide
Pin configuration for KSZ9031RNXVB-TRVAO (48-pin wqfn (lead-free) 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 KSZ9031RNXVB-TRVAO.
Refer to the datasheet for full pin configuration.
Typical Applications
KSZ9031RNXVB-TRVAO is suitable for 6 applications: Automotive Infotainment Ethernet Backbone, Industrial Gigabit Switch Uplink PHY, Set-Top Box and IPTV MAC Interface, Network Printer and MFP Ethernet Port, Single-Board Computer Gigabit Ethernet, ADAS Camera Ethernet Network.
Automotive Infotainment Ethernet Backbone
The KSZ9031RNXVB-TRVAO provides the 1000BASE-T physical layer for in-vehicle networking where most ECUs need 100 Mbps and the head unit backbone needs 1 Gbps. Its AEC-Q100 qualification and -40C to +85C range suit the cabin environment, while the 48-WQFN package fits behind the head-unit display PCB. Pair with a 1000BASE-T capable switch SoC and a single automotive-grade magnetics module for a 4-port Ethernet switch.
Recommended
Industrial Gigabit Switch Uplink PHY
Industrial managed switches use the KSZ9031RNXVB-TRVAO as the SFP-less 1000BASE-T uplink PHY. The RGMII v2.0 interface connects directly to switch SoCs from vendors like Microchip (KSZ9897) and Marvell (88E6390), while the 1.2V internal LDO eliminates an external regulator. Energy-detect power-down mode is critical for PoE-powered switches where idle port current must be minimized per IEEE 802.3az EEE requirements.
Recommended
Set-Top Box and IPTV MAC Interface
Set-top boxes need 1 Gbps Ethernet to receive 4K HDR streams; the KSZ9031RNXVB-TRVAO connects the SoC MAC via RGMII to a home router. Its on-chip MDI termination resistors reduce BOM cost, while the 125 MHz reference clock output can drive downstream devices. The Wake-on-LAN feature is essential for remote service and firmware updates from the headend while the box is in standby.
Recommended
Network Printer and MFP Ethernet Port
Enterprise printers and multifunction devices need gigabit Ethernet for large scan jobs and direct-print protocols. The KSZ9031RNXVB-TRVAO's RGMII interface glues to printer SoCs from Marvell and MediaTek, while its low standby current (energy-detect mode) meets Energy Star requirements. The 48-WQFN footprint allows the PHY to sit on a small network interface PCB card inside the printer chassis.
Recommended
Single-Board Computer Gigabit Ethernet
SBCs like those based on NXP i.MX8 and Rockchip RK3588 use the KSZ9031RNXVB-TRVAO for the on-board RJ-45 gigabit port. The 25 MHz crystal input matches common SoC reference clock domains, and the RGMII ID mode reduces pin count to 12 for the SoC. The exposed-pad WQFN provides excellent thermal performance in fanless SBC enclosures, supporting 1 Gbps continuous bidirectional traffic without throttling.
Recommended
ADAS Camera Ethernet Network
Modern ADAS systems use 1000BASE-T to transport multi-megapixel camera streams between the camera modules and the central ECU. The KSZ9031RNXVB-TRVAO's AEC-Q100 qualification, -40C to +85C range, and deterministic 1000BASE-T latency are critical for camera-to-ECU links behind windshield-mounted camera housings. The 48-WQFN small footprint enables PCB integration inside the camera module where space is at a premium.
Recommended
Recommended Products Summary
Engineering reference data for KSZ9031RNXVB-TRVAO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | KSZ9031RNXVB-VAO | KSZ9031RNXUB-TRVAO | KSZ9031RNXIC-TR | RTL8211F-CG |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Realtek |
| Package | 48-WQFN | 48-WQFN - same | 48-WQFN - same | 48-WQFN - same | QFN-48 - same |
| MAC Interface | RGMII | RGMII | RGMII | RGMII | RGMII/GMII |
| Data Rate | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps |
| AEC-Q100 | Yes | Yes | Yes | No (industrial) | No (commercial) |
| Operating Temperature | -40C to +85C (automotive) | -40C to +85C | -40C to +85C | 0C to +70C | 0C to +70C |
| Packaging | Tape & Reel | Tray | Tape & Reel | Tape & Reel | Tape & Reel |
| Unit Price (1pc, as of 2026-10-08) | $8.59 | $8.95 | $8.75 | $5.40 | $2.10 |
| Reference Clock Out | 125 MHz | 125 MHz | 125 MHz | 125 MHz | 125 MHz |
Key Differentiators
- AEC-Q100 automotive qualification with same 48-WQFN footprint as industrial variants (vs KSZ9031RNXIC-TR)
- Single-source automotive 1G PHY with 125 MHz reference clock output (vs RTL8211F-CG (Realtek))
- Tape-and-reel packaging for high-volume automotive SMT lines (vs KSZ9031RNXVB-VAO (tray))
Design Notes
Place the KSZ9031RNXVB-TRVAO within 1 cm of the magnetics module and route each MDI pair as a 100-ohm differential with intra-pair length matching under 0.5 mm and inter-pair matching under 2 mm. Per the Microchip KSZ9031 datasheet, the four MDI pairs (MDI[0]+/- through MDI[3]+/-) should be routed on the top layer over a continuous ground reference on layer 2 to control impedance to 100 ohms +/- 10%. The 48-WQFN exposed pad MUST be soldered to a ground pad with at least 8 thermal vias to the inner ground plane for thermal dissipation and low-impedance ground return.
Power sequencing for the KSZ9031RNXVB-TRVAO requires AVDD and DVDD rails to come up together or DVDD first per the Microchip datasheet reset timing section. Place 0.1uF X7R ceramic decoupling within 2 mm of each AVDD/AVDDPLL/DVDD pin, with a 10uF bulk tantalum or ceramic on each rail. The integrated 1.2V LDO supplies the digital core from an external 2.5V or 3.3V supply; do not back-drive DVDD externally. Power-good timing: tRST of 25 ms after supply stable, with RESETn held low during power-up.
Common pitfalls with the KSZ9031RNXVB-TRVAO include: (1) leaving the 25 MHz crystal capacitors (typically 18-22 pF) at default values when the actual crystal load capacitance is different, causing link failures at high temperature; (2) incorrect RGMII clock-to-data timing skew (PCB trace mismatch > 50 ps causes CRC errors at 1 Gbps); (3) failing to strap the PHY address and mode pins via 4.7K resistor selection at reset (open/ground selection wrong = no link); (4) using a non-AEC-Q100 magnetics module in automotive designs (AEC-Q100 is system-level). Reference the KSZ9031 reference design (AN2386) for correct values.
Estimated: At 1 Gbps full-duplex operation with 3.3V supply, the KSZ9031RNXVB-TRVAO dissipates approximately 700 mW. With the 48-WQFN package theta_JA of approximately 28 C/W on a standard JEDEC 4-layer test board, junction temperature rise above 85C ambient is 19.6 C. Per Microchip datasheet thermal characterization, the maximum junction temperature is 125C, leaving 20C margin. In enclosed automotive or industrial housings, add thermal vias under the exposed pad and consider forced-air cooling if ambient exceeds 70C continuously.
Compliance Information
AEC-Q100 qualified per -TRVAO suffix; RoHS compliant lead-free WQFN package per Microchip product declaration
