KSZ8081RNDIA TR Microchip Integrated Circuit (Quad Flat No-Lead) In Stock
The KSZ8081RNDIA TR is a Microchip 10BASE-T/100BASE-TX Ethernet PHY with RMII interface support in a compact QFN package, offering auto-negotiation and HP Auto-MDI/MDI-X for flexible RJ45 connectivity. Available in stock worldwide.
- Manufacturer
- Microchip
- Package
- Quad Flat No-Lead
- Pin Count
- 25
- Lifecycle
- ACTIVE
- Datasheet
- KSZ8081RNDIA TR Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of KSZ8081RNDIA TR?
- RMII interface at 50 MHz simplifies connection to microcontroller Ethernet MACs with a 2-wire reduced-pin bus
- 10BASE-T and 100BASE-TX auto-negotiation with HP Auto-MDI/MDI-X for plug-and-play Ethernet connectivity without crossover cables
- Low-power QFN package with 3.3 V single-supply operation for compact IoT gateway and embedded networking designs
What is KSZ8081RNDIA TR used for?
The KSZ8081RNDIA TR is well suited for embedded Ethernet applications in industrial controllers, IoT gateways, and single-board computers requiring a small-footprint 100 Mbps PHY interface. Its RMII interface reduces the MAC-to-PHY signal count to 9 lines compared to 18 for MII, simplifying PCB routing on tight layouts. Medical and building automation equipment also use the device for reliable wired LAN connectivity at 3.3 V with minimal external components.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the KSZ8081RNDIA TR datasheet?
KSZ8081RNDIA TR Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for KSZ8081RNDIA TR?
Compatible alternatives and drop-in replacements for KSZ8081RNDIA TR:
Frequently Asked Questions
How does the RMII interface of KSZ8081RNDIA TR reduce PCB routing complexity compared to MII?
RMII (Reduced MII) uses a single 50 MHz reference clock and 2-bit data paths for TX and RX, requiring only 9 signal lines between the MAC and PHY versus 18 for standard MII. On a 4-layer PCB with a 100 MHz ARM Cortex-M7 MAC, this halves the length-matched traces needed for the interface, cutting routing time and reducing EMI from high-speed differential pairs.
What Ethernet speeds does KSZ8081RNDIA TR support, and how does auto-negotiation work with network switches?
The device supports 10BASE-T at 10 Mbps and 100BASE-TX at 100 Mbps, with IEEE 802.3 auto-negotiation to select the highest common speed with the connected switch or router. In a factory automation panel with a 100 Mbps managed switch, the KSZ8081RNDIA TR negotiates 100 Mbps full-duplex within 500 ms of link-up without firmware intervention.
For an IoT gateway PCB using KSZ8081RNDIA TR, what is the minimum external component count needed for a functional Ethernet port?
A typical design requires a 25 MHz crystal or 50 MHz oscillator, a 10/100 Ethernet transformer module, an RJ45 connector, and 4 to 6 bypass capacitors on the 3.3 V supply. The HP Auto-MDI/MDI-X feature eliminates the crossover detection circuit, and integrated termination reduces the external resistor count to under 10 components total per Ethernet port.
How does HP Auto-MDI/MDI-X in KSZ8081RNDIA TR simplify cable and connector selection in industrial deployments?
HP Auto-MDI/MDI-X automatically detects whether a straight-through or crossover cable is connected and reconfigures the transmit and receive pairs accordingly. This means installers can use any standard Cat5 patch cable of up to 100 m to connect an industrial controller to a switch without worrying about cable polarity, reducing field installation errors and cable inventory requirements.
What supply voltage does KSZ8081RNDIA TR require, and is it compatible with 3.3 V microcontroller I/O without a level shifter?
The KSZ8081RNDIA TR operates from a single 3.3 V supply, and its RMII data and control pins are 3.3 V CMOS compatible, enabling direct connection to STM32, NXP i.MX RT, or similar 3.3 V microcontroller Ethernet MAC interfaces without any level-shifting logic. The 3.3 V supply current is typically under 80 mA at 100 Mbps full-duplex operation.
Related Guides
CSD87313DMS Synchronous Buck Power Stage Design Guide
Design a compact CSD87313DMS synchronous buck stage with practical guidance for loss, gate drive, PCB layout, EMI, thermal validation, and sourcing.
Aug 6, 2026
STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection
Choose STEF05SGR for 5 V overcurrent protection by checking current-limit margin, inrush, thermal loss, fault response, and sourcing.
Aug 6, 2026
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
Why Buy from FindMyChip
About Microchip
Microchip is a leading electronic component manufacturer. FindMyChip sources Microchip ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
More from Microchip
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“FindMyChip sourced our entire STM32 BOM in 48 hours when our usual distributor had 16-week lead times.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit