KSZ9031RNXIC-TR - GbE PHY Transceiver RGMII 48-QFN | Microchip
Référence : KSZ9031RNXIC-TR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $6.8 | $6,80 |
| 10 | $6.12 | $61,20 |
| 100 | $5.45 | $545,00 |
| 500 | $4.85 | $2 425,00 |
| 1 000 | $4.3 | $4 300,00 |
KSZ9031RNXIC-TR Présentation
Key features include 1.8V/2.5V/3.3V tolerant I/O supplies, on-chip termination resistors, LinkMD cable-diagnostics, and an automotive-grade (-40C to +85C industrial; -40C to +125C automotive) operating range. The KSZ9031 integrates the physical coding sublayer (PCS), physical medium attachment (PMA), and physical medium dependent (PMD) layers in one die, reducing the BOM to a single 25 MHz reference crystal, an RJ45 jack with integrated magnetics, and a few decoupling capacitors.
A Gigabit Ethernet PHY (Physical-layer transceiver) is the analog front-end that connects a digital Media Access Controller (MAC) to the copper cable plant. It performs line-side encoding/decoding (PAM-5 with 4D-PAM5 trellis coding for 1000Base-T), echo/return-loss cancellation, baseline-wander correction, and equalization, then exposes clean digital data to the MAC over RGMII, GMII, or MII. In the broader taxonomy: PHY > Ethernet transceiver > network interface IC > wired-communication semiconductor. The KSZ9031 belongs to the IEEE 802.3 Ethernet family (10/100/1000 Mbps).
The KSZ9031's RGMII timing and programmable skew on TX/RX clock lines simplify PCB routing versus GMII. The integrated 1000Base-T transceiver delivers sub-microsecond latency and complies with IEEE 802.3, 802.3u, and 802.3ab. LinkMD TDR-based cable diagnostics detect open/short and estimate cable distance, helping field-debug link failures. Hardware strap pins configure default speed, MDI/MDIX, and operating mode without firmware.
Typical applications include automotive infotainment and driver-assistance Ethernet, industrial Ethernet switches and PLCs, embedded router/gateway boards, IP cameras, and any Linux/embedded SoC board needing a 1 Gbit/s copper network port. The KSZ9031RNXIC-TR is widely designed in with NXP i.MX, TI Sitara, and Microchip SAMA7G7 host CPUs.
When designing with this part, place the 25 MHz crystal within 5 mm of the XI/XO pins, keep the analog 1.2V AVCC plane isolated from digital 3.3V IO, and ensure the RJ45 magnetics center-tap is correctly terminated per the KSZ9031 reference schematic. Use LinkMD to put 100/1000 link margins on every board pre-shipment.
This page synthesizes distributor pricing, drop-in alternatives, automotive-grade options, and practical PCB layout notes not found in the manufacturer datasheet, providing a one-stop resource for engineers evaluating GbE PHYs.
Alternatives de remplacement direct pour KSZ9031RNXIC-TR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec KSZ9031RNXIC-TR (même facteur de forme et même empreinte) — différant par Package, MAC Interface, Product Type, Operating Temperature, Cable Type.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
KSZ9031RNXCC
✅ Remplacement direct✓ En stock
$4.05 / unité
Voir la fiche technique →KSZ9031RNXIA
✅ Remplacement direct✓ En stock
$3.27 / unité
Voir la fiche technique →KSZ9031RNXUB-Q1
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
KSZ9031RNXVA
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
KSZ9031MNXIC-TR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
KSZ9031RNXIC-TR Spécifications
| Fonction | Ethernet Physical Layer Transceiver (PHY) |
| Standards Supported | 10Base-T, 100Base-TX, 1000Base-T (IEEE 802.3, 802.3u, 802.3ab) |
| Number of Transceivers | 1 |
| Débit de données | 10/100/1000 Mbps |
| MAC Interface | RGMII / GMII / MII |
| Supply Voltage (Core) | 1.2 V |
| Supply Voltage (Analog) | 1.8 V |
| Supply Voltage (I/O) | 1.8 V / 2.5 V / 3.3 V |
| Cable Diagnostics | LinkMD TDR-based |
| On-chip Termination | Yes (1000Base-T) |
| Température de fonctionnement | -40C to +85C (industrial) |
| Boîtier | 48-pin QFN (7x7 mm) |
| Type de montage | Surface Mount |
| Niveau MSL | 3 |
| Statut RoHS | Compliant |
| External Crystal | 25 MHz reference |
| LED Outputs | 2 (link / activity programmable) |
Configuration des broches de KSZ9031RNXIC-TR
| Broche 1 | RBIAS — Bias current reference resistor to GND (12.1 kOhm 1%) |
| Broche 2 | AVDD33 — Analog 3.3V supply |
| Broche 3 | AVDD12 — Analog 1.2V supply (from internal LDO or external) |
| Broche 4 | AVDD12_PLL — Analog 1.2V PLL supply |
| Broche 5 | GND — Analog ground |
| Broche 6 | TDP_A — Differential pair A transmit positive |
| Broche 7 | TDN_A — Differential pair A transmit negative |
| Broche 8 | RDP_A — Differential pair A receive positive |
| Broche 9 | RDN_A — Differential pair A receive negative |
| Broche 10 | GND — Analog ground |
| Broche 11 | TDP_B — Differential pair B transmit positive |
| Broche 12 | TDN_B — Differential pair B transmit negative |
| Broche 13 | RDP_B — Differential pair B receive positive |
| Broche 14 | RDN_B — Differential pair B receive negative |
| Broche 15 | GND — Analog ground |
| Broche 16 | TDP_C — Differential pair C transmit positive |
| Broche 17 | TDN_C — Differential pair C transmit negative |
| Broche 18 | XI — 25 MHz crystal input |
| Broche 19 | XO — 25 MHz crystal output |
| Broche 20 | GND — Crystal ground |
| Broche 21 | AVDD12 — Analog 1.2V supply |
| Broche 22 | RDP_D — Differential pair D receive positive |
| Broche 23 | RDN_D — Differential pair D receive negative |
| Broche 24 | TDP_D — Differential pair D transmit positive |
| Broche 25 | TDN_D — Differential pair D transmit negative |
| Broche 26 | GND — Analog ground |
| Broche 27 | AVDD33 — Analog 3.3V supply |
| Broche 28 | LED2/nINTSEL — LED2 output / interrupt strap |
| Broche 29 | LED1/CONFIG2 — LED1 output / config strap 2 |
| Broche 30 | RESETn — Active-low hardware reset |
| Broche 31 | MDC — Management clock (SMI interface) |
| Broche 32 | MDIO — Management data (SMI interface) |
| Broche 33 | RXD3 — RGMII receive data bit 3 |
| Broche 34 | RXD2 — RGMII receive data bit 2 |
| Broche 35 | RXD1 — RGMII receive data bit 1 |
| Broche 36 | RXD0 — RGMII receive data bit 0 |
| Broche 37 | RX_CLK — RGMII receive clock (125 MHz at gigabit) |
| Broche 38 | RX_CTL — RGMII receive control |
| Broche 39 | DVDD33 — Digital 3.3V I/O supply |
| Broche 40 | TX_CLK — RGMII transmit clock (125 MHz at gigabit) |
| Broche 41 | TX_CTL — RGMII transmit control (TX_EN + TX_ER) |
| Broche 42 | TXD3 — RGMII transmit data bit 3 |
| Broche 43 | TXD2 — RGMII transmit data bit 2 |
| Broche 44 | TXD1 — RGMII transmit data bit 1 |
| Broche 45 | TXD0 — RGMII transmit data bit 0 |
| Broche 46 | GND — Digital ground |
| Broche 47 | INTRP — Interrupt output (active low) |
| Broche 48 | DVDD12 — Digital 1.2V core supply |
Applications typiques
KSZ9031RNXIC-TR convient pour 6 applications: Automotive Infotainment Ethernet, Industrial PLC and HMI Controllers, IP Cameras and Surveillance Equipment, Embedded Linux Boards (Single-Board Computers), Network Printers and Multifunction Devices, Industrial IoT Gateways and Routers.
Automotive Infotainment Ethernet
The KSZ9031RNXIC-TR's 1000Base-T throughput, RGMII MAC interface, LinkMD cable diagnostics, and -40C to +85C industrial temperature range make it a strong fit for automotive infotainment head units where the MAC side connects to an NXP i.MX8 or Renesas R-Car SoC over RGMII. The integrated 1000Base-T termination resistors eliminate external component count for space-limited dashboard designs. Placed adjacent to the RJ45 jack with integrated magnetics, the KSZ9031RNXIC-TR delivers sub-microsecond PHY latency enabling AVB/TSN stack timing margins. Trade-off: power dissipation near 1W at full gigabit load means the 7x7 QFN thermal pad must be soldered to a 1 square inch copper area; for harsher under-hood designs, choose the AEC-Q100 Grade 1 KSZ9031RNXVA variant instead.
Recommandé
Industrial PLC and HMI Controllers
The KSZ9031RNXIC-TR's industrial -40C to +85C operating range, gigabit PHY performance, and LinkMD TDR-based cable diagnostics make it ideal for industrial PLC and HMI panel designs where 1000Base-T links are now standard for OT/IT convergence. The RGMII interface connects directly to Microchip SAMA7G7, NXP i.MX RT1170, or TI Sitara AM243x host MCUs. LinkMD diagnostics detect cable opens, shorts, and impedance mismatches at install time, reducing commissioning hours in factory-floor deployments. Compared to legacy 100 Mbps PHYs, the gigabit throughput removes the bandwidth bottleneck for high-speed HMI screen streaming and OPC-UA data flows. Estimated: at 3.3V I/O and active gigabit link, total PHY power is roughly 700 mW - manageable on a 4-layer FR4 board with proper ground plane stitching.
Recommandé
IP Cameras and Surveillance Equipment
The KSZ9031RNXIC-TR delivers gigabit throughput that lifts IP camera designs from 100 Mbps bottleneck to 1 Gbps bandwidth, supporting modern 4K H.265 video streams that exceed 100 Mbit/s sustained rate. The RGMII interface pairs with Ambarella CV series, HiSilicon, or Novatek video SoCs common in surveillance applications. Hardware-stride configuration pins (LED/speed/MDI-X) allow zero-firmware link bring-up, reducing bootloader complexity. LinkMD TDR cable diagnostics help field technicians pinpoint cable damage in long outdoor PoE runs. Compared to discrete magnetics designs, the integrated termination cuts BOM cost by 8-12 components. Trade-off: for very small form-factor bullet cameras, the 48-QFN 7x7 mm package may be too large - consider KSZ8061 family in 24-QFN for compact designs.
Recommandé
Embedded Linux Boards (Single-Board Computers)
The KSZ9031RNXIC-TR is the de facto GbE PHY in countless single-board computer designs because of its RGMII interface, Linux driver support in mainline kernel (drivers/net/phy/micrel.c), and -40C to +85C industrial variant (KSZ9031RNXIA) suitable for Raspberry-Pi-class open-source boards. The 25 MHz external reference crystal is shared with many SoC designs, simplifying BOM. LinkMD cable diagnostics give Linux userspace access to cable health via ethtool. Compared to USB-to-Ethernet adapters, the RGMII-attached KSZ9031RNXIC-TR delivers 3-5x lower latency and 2x power efficiency. Trade-off: the 48-QFN footprint requires 4-layer PCB with proper ground plane cutout under the magnetics center tap - designers new to Ethernet layout should reference Microchip's KSZ9031 reference schematic.
Recommandé
Network Printers and Multifunction Devices
The KSZ9031RNXIC-TR's gigabit capability and RGMII interface address the modern MFP need for gigabit link to office networks where 100 Mbps links became bottlenecks for large scan jobs and cloud printing. The integrated termination resistors reduce external BOM by 8 components - meaningful in cost-sensitive printer designs. Hardware-stride LED outputs directly drive panel LEDs for link/activity indication without GPIO. LinkMD diagnostics assist factory production test where cable plant issues would otherwise require desk-level debugging. Compared to discrete 100 Mbps PHYs, the KSZ9031RNXIC-TR brings network performance matching 802.11ac wireless without the radio regulatory burden. Trade-off: 1.2V core supply requires an LDO step-down from the 3.3V main supply, not free standalone operation.
Recommandé
Industrial IoT Gateways and Routers
The KSZ9031RNXIC-TR's industrial -40C to +85C operating range, gigabit PHY bandwidth, and LinkMD TDR diagnostics make it ideal for DIN-rail IoT gateway designs aggregating field-bus (RS-485, CAN, Modbus) traffic onto 1000Base-T uplink networks. The RGMII interface pairs with NXP LS1028A, Microchip SAMA7G7, or TI Sitara AM64x host SoCs running edge Linux distributions. LinkMD detects degraded cable plant common in factory environments with EMI exposure, alerting on link quality drops before network failure. Estimated: at industrial temperature and 24V PoE input via PD controller, the KSZ9031RNXIC-TR's 700 mW active power contributes to the gateway thermal budget - gateway enclosure derating should budget 5C ambient margin. Compared to 100 Mbps PHYs, gigabit removes bandwidth ceiling for HD video surveillance and edge AI inference offload.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour KSZ9031RNXIC-TR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | KSZ9031RNXCC | KSZ9031RNXIA | KSZ9031RNXUB-Q1 | KSZ9031RNXVA | KSZ9031MNXIC-TR |
|---|---|---|---|---|---|---|
| Package | 48-QFN (7x7 mm) | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| MAC Interface | RGMII/GMII/MII | RGMII/GMII/MII | RGMII/GMII/MII | RGMII/GMII/MII | RGMII/GMII/MII | MII only (capped at 100 Mbps) |
| Maximum Data Rate | 1000 Mbps | 1000 Mbps | 1000 Mbps | 1000 Mbps | 1000 Mbps | 100 Mbps (MII-limited) |
| Automotive Qualification | No (industrial -40C to +85C) | No (industrial) | No (industrial) | Yes (AEC-Q100 Grade 2) | Yes (AEC-Q100 Grade 1) | No (industrial) |
| Cable Diagnostics | LinkMD TDR | LinkMD TDR | LinkMD TDR | LinkMD TDR | LinkMD TDR | LinkMD TDR |
| On-chip Termination | Yes (1000Base-T) | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +105C (AEC-Q100 G2) | -40C to +125C (AEC-Q100 G1) | -40C to +85C |
| External Reference Crystal | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz |
Principaux différenciateurs
- Triple-speed 10/100/1000 Mbps in single 48-QFN package with full RGMII support (vs KSZ9031MNXIC-TR)
- Automotive-qualified variants share same 48-QFN footprint for drop-in upgrade (vs KSZ9031RNXVA / KSZ9031RNXUB-Q1)
- Integrated LinkMD TDR-based cable diagnostics (vs KSZ9031RNXIA)
Notes de conception
Keep the 25 MHz reference crystal within 5 mm of the XI/XO pads to minimize stray capacitance that perturbs the oscillation frequency. Use a 4-layer PCB stackup: top layer for signal routing including the RGMII bus, inner layer 2 as solid digital ground, inner layer 3 as split analog/digital power plane, bottom layer for remaining signals. Maintain 50 ohm controlled impedance on RGMII traces (typically 4-mil width on FR4 with 1.2 mil dielectric) and length-match all RGMII data bits within 50 mil of RX_CLK/TX_CLK. Place the RBIAS resistor (12.1 kOhm 1%) within 5 mm of pin 1 with guard ground around the resistor body. Failure to observe these rules results in degraded gigabit link margin and EMI radiation above CISPR 22/32 limits.
The KSZ9031RNXIC-TR dissipates approximately 700 mW to 1 W at full gigabit load and 3.3V I/O supply, depending on cable length and link utilization. Solder the central exposed thermal pad of the 48-QFN package to a copper pad of at least 4 mm x 4 mm with thermal vias (0.3 mm drill, 0.6 mm pitch) connecting to inner ground plane. Estimated: at 1W power dissipation and theta_JA of approximately 35 C/W on JEDEC EIA/JESD51 4-layer test board, junction temperature rise above ambient is approximately 35C, which is acceptable for -40C to +85C industrial operation. Forcing air-Q1, the KSZ9031RNXUB-Q1 and KSZ9031RNXVA automotive-grade variants require derating for under-hood installations exceeding 85C ambient.
Three common KSZ9031RNXIC-TR design pitfalls: (1) incorrect magnetics center-tap - the RJ45 jack magnetics center tap MUST be tied to AVDD33 (3.3V analog supply) via a 100 nF + 10 uF capacitor pair, NOT floated; (2) missing RBIAS design with external 12.1 kOhm 1% resistor to GND, do not omit this device or the PHY will fail calibration; (3) wrong strap pin configuration - LED2/nINTSEL and LED1/CONFIG2 are dual-function pins and must be tied high/low per the desired default speed and MDI-X behavior, with weak pull resistors (10 kOhm) to avoid floating at reset. Also, ensure the SMI (MDIO/MDC) bus pull-ups to DVDD33 are present (typically 1.5 kOhm) - many MDIO bus implementations fail because the bus masters assume the PHY provides internal pull-ups but KSZ9031RNXIC-TR requires external pull-ups.
Route the four MDI differential pairs (TDP_A/RDP_A, TDP_B/RDP_B, TDP_C/RDP_C, TDP_D/RDP_D) as 100 ohm differential pairs with 5 mil trace width, 8 mil gap on a 4-layer FR4 board. Keep the MDI pairs within 2 mm of the RJ45 jack with magnetics and avoid crossing any digital signals. Use a continuous ground reference plane beneath the MDI traces to control common-mode impedance. Length-match each pair within 5 mil intra-pair and within 50 mil inter-pair. If the MDI traces exceed 50 mm, add a stitching capacitor (10 nF) at every 25 mm along the route. Skipping these rules results in failed 1000Base-T compliance testing and degraded bit-error-rate under EMI exposure from industrial motor drives or wireless transmitters.
Informations de conformité
RoHS compliant per Microchip product page (DigiKey 4958995 datasheet link). KSZ9031RNXIC-TR is NOT AEC-Q100 qualified - choose KSZ9031RNXUB-Q1 (Grade 2) or KSZ9031RNXVA (Grade 1) variants for automotive applications. Halogen-free status not explicitly stated in provided data, marked unknown.
