Microchip KSZ8081RNBIA Ethernet PHY Transceiver IC QFN-32

The Microchip KSZ8081RNBIA Ethernet PHY Transceiver IC is a single-supply 10BASE-T/100BASE-TX Ethernet physical-layer transceiver in a compact, surface-mount 32-pin QFN package. It is designed for reliable data transmission and reception over standard CAT-5 unshielded twisted pair (UTP) cable, and is suited to embedded network applications where board space and design simplicity are important.

Overview

The KSZ8081RNBIA integrates critical components to simplify board design. On-chip termination resistors for the differential pairs remove the need for external components and help streamline PCB layout. A built-in, low-noise 1.2V regulator supplies the core, reducing system complexity and power supply design overhead.

Key Features

• Supports the RMII (Reduced Media Independent Interface) v1.2 standard
• Configurable 50MHz reference clock, which can be output to the MAC or input to the PHY
• LinkMD TDR-based cable diagnostics for identifying faults in copper cabling
• Parametric NAND tree support for fault detection between the chip's I/Os and the board
• Multiple loopback modes for system diagnostics and debugging
• Standard MDC/MDIO interface for detailed PHY register programming
• Programmable LED outputs for link and activity status
• Baseline wander correction, power-down modes, and back-to-back mode support for creating a 100Mbps copper repeater

Power and Package

The device operates from a single 3.3V power supply and offers VDD I/O voltage options of 1.8V, 2.5V, or 3.3V for compatibility with various logic levels. It is housed in a compact, surface-mount 32-pin QFN package and is specified for the industrial temperature range.

Choose the Microchip KSZ8081RNBIA when you need a versatile Ethernet PHY transceiver for integrating Ethernet connectivity into embedded designs.