EmbeddedRelated.com
    Parts   Interface ICs  Ethernet PHY    KSZ8091RNAIA-TR
KSZ8091RNAIA-TR

MCHPKSZ8091RNAIA-TR

Microchip Technology
Ethernet ICs 10/100 BASE-TX Physical Layer Transceiver, EEE, WOL
NRND5,440 in stock
Datasheet Mouser Compare Prices

Overview

The KSZ8091RNAIA-TR is a single-supply 10/100BASE-TX Ethernet physical layer transceiver designed for power-sensitive applications using the RMII interface. It integrates Energy Efficient Ethernet (EEE) and Wake-on-LAN (WoL) support to minimize system power consumption in standby and active states. The chip features LinkMD TDR-based cable diagnostics and high 6kV HBM ESD protection, making it robust for industrial environments.

Why Choose This Part

This transceiver reduces BOM cost and PCB complexity via on-chip termination resistors for differential pairs and an integrated 1.2V regulator for the core. It offers excellent power efficiency with multiple power-down modes and a low 34mA run current in 100BASE-TX mode. Additionally, the RMII back-to-back mode allows for unique repeater or media converter configurations without an external MAC.

Applications

Industrial Automation
Provides reliable 10/100 Ethernet connectivity for PLCs, motor controllers, and industrial sensors with extended temperature support.
Low-Power Embedded Systems
Ideal for battery-powered or energy-constrained IoT devices utilizing the RMII interface and Energy Efficient Ethernet (IEEE 802.3az).
Networked Consumer Electronics
Used in game consoles, digital TVs, and set-top boxes where Wake-on-LAN and small QFN footprints are required.
IP Cameras and Security
Supports high-reliability video streaming over Ethernet with integrated termination resistors to simplify PCB design.

Key Specifications

Type Transceiver
Duplex Full
Protocol Ethernet
Mounting Type Surface Mount
Package / Case 24-VFQFN Exposed Pad
Voltage - Supply 3.3V
Operating Temperature -40degC ~ 85degC
Supplier Device Package 24-QFN (4x4)
Number of Drivers/Receivers 1/1

Getting Started

For evaluation, utilize the KSZ8081RNA/91RNA Evaluation Board (EVB-KSZ8081RNA) which provides a standard RJ45 jack and headers for RMII signals. Configuration is performed via the MDC/MDIO management interface to access internal registers for link status and diagnostics. Ensure the VDDIO rail is correctly strapped to 1.8V, 2.5V, or 3.3V to match your processor's I/O voltage levels.

KSZ8091 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Temp Range Stock
KSZ8091RNAIA-TR (this part) Tape & Reel -40degC ~ 85degC 5,440
KSZ8091RNACA-TR Tape & Reel 0degC ~ 70degC 4,020

Also Consider

LAN8720A MCHPMicrochip Technology - A widely used RMII 10/100 PHY with a similarly small 24-QFN footprint, often found in popular open-source hardware designs.
KSZ8081RNACA MCHPMicrochip Technology - A similar RMII PHY that is often considered when specific EEE or WoL features of the 8091 series are not required.

Categories

Interface ICs > Ethernet PHY Industrial & Automation > Industrial Communication IoT & Smart Devices > Smart Home & Building